ansible jinja variable conditional Hi guys, I need to create something Jinja2 templates are simple template files that store variables that can change from time to time. . The template files will usually have the . iam_server_certificate_info module to get information about a server certificate on aws ec2, and registering it as a variable &quot;server_cert_info_result&quot; Join Robert Starmer for an in-depth discussion in this video, Variables in roles and variable precedence, part of Ansible Essential Training. . Templating is extremely useful when creating custom configuration files for multiple servers but unique for each of them. . By default Ansible templates have trim_blocks true and lstrip_blocks false. ext. The dictionary can then be used by a Jinja2 template to populate the necessary settings. Examples of such special variables include: ansible_all_ipv4 Ansible Register Variables Ansible registers provide us with a nice way of capturing the results of a given task and executing a set of additional automations based on the captured results. With Ansible, you can execute tasks and playbooks on multiple different systems with a single command. We leverage Ansible facts and the filter [0:2] to parse the hostname. 7. j2; Example of looping in filebeat. checksum != {{ task }} ISSUE TYPE. Collectively, the list of Ansible predefined variables is referred to as Ansible facts and these are gathered when a playbook is executed. ANSIBLE VERSION Data manipulation¶. Two Jinja2 templates were created for two configuration “modules” to show how a full configuration can be broken up into smaller pieces. Ansible when variable contains string We can also make a conditional statement based on whether the variable contains a particular string. While you can do a lot of complex things in Jinja, only the basics are things you really need to learn at first. Please, looks at the content this JSON. This way, you can see all of the defined variables by referencing a single file, but the confidential values will remain in the encrypted file. As a reminder, the various YAML files contain just keys and values: --- # for vars/RedHat. Conditional if. ansible-docs Parses the docstringsof Ansible modules to see example syntax and the parameters modules require. This is using the group_names magic variable. ansible-pull Reverses the normal “push” model and lets clients "pull" from a centralized server for execution. yml files, based on variable passed from Tower/AWX and register to a variable. What is Jinja2? jinja variables; jinja filters; jinja tests; How to use ansible template; Review of the ansible template documentation; Module 11 - Conditional and Looping Tasks. Another category of variables are special variables. We have a set of filters, jinja2 template filters and custom filters created by users. When Playbooks are executed, these variables get replaced by actual values defined in Ansible Playbooks. Being modern it is hence also design-friendly language for Python, modelled after Django’s templates. Jinja2 uses the if statement to provide conditional control. html file on the remote host. Exploring Jinja2 Variable Syntax in Ansible | The NTC Mag Using Variables: About Jinja2 ¶ It’s nice enough to know about how to define variables, but how do you use them? Ansible allows you to reference variables in your playbooks using the Jinja2 templating system. Use {% raw %}/{% endraw %} blocks as Jinja2 documentation suggests. Jinja2 templating can also be used with conditional statements such as for loops to iterate over a list of items. date }} variable with the date in YYYY-MM-DD format. Ansible uses Jinja2 templating to enable dynamic expressions and access to variables. Hello! I've been using AWX a lot recently, and I'm wondering if there's an effective way to store variables only on the remote machine. First add the following line to your ansible. acr_name) will be set to stageacr. This approach minimizes the package requirements on the target (jinja2 is only required on the Conditional statements in Jinja2 You can use the if conditional statement in Jinja2 for testing various conditions and comparing variables. Documentation on the template formatting can be found in the Template Designer Documentation. Ansible allows you to reference variables in your playbooks using the Jinja2 templating system. myvariable: 'param1' If only param1,param2 passed. Jinja2 string filter example 5: default value. ansible. While you can do a lot of complex things in Jinja, only the basics are things you really need to learn at first. Jinja is a modern and designer-friendly templating language for Python, modelled after Django’s templates. The large difference in use is that filters are referenced as variable | filter_name while jinja tests are referenced as variable is test_name. Ansible has a built-in module named template that is used to generate configuration files. There is a very special construction in Jinja2/Ansible: ‘foo is defined’, which allows you to check if foo is existing at all. In the following example, the value of the result variable is placed in the deployed file only if the value of the finished variable is True. There are a few more of these, useful in different scenarios. j2 template: ansible allows Jinja2 loops and conditionals in templates, but in playbooks, we do not use them. html and, as you can see, the ansible_hostname variable has been replaced with the actual server host name, in which case the Centos-7. We can do much more than replacing the variables with the help of Jinj2 templating engine. Ansible now prints a warning if I use jinja templating delmiters such as {{ . Ask Question Asked 4 months ago. aws. Ansible uses Jinja2 as a template engine. j2. Jinja provides an excellent solution for manipulating strings and concatenating text (joining it with other text). conf based on the hostname). You can then use the value of these registers for different scenarios like a conditional statement, logging etc. ext. You already know, that ansible-vault allows you to store your confidential data along with your code. jinja2 template was processed by the Jinja2 templating language and replaced the {{ ansible_date_time. *)$ will always match only one result, while (. Ansible registers are used when you want to capture the output of a task to a variable. For example ^(. branch is the variable I pass in. It is fast, widely used and secure with the optional sandboxed template execution environment: But I am referencing a variable declared in global_vars file so i have no other option to reference it. files to the task that generates the yum or apt repo configurations. j2’ extension denoted after jinja2 and resides in . To make a variable optional, set the default value to the special variable omit: I would like to understand why was ternary filter created and why is it preferred (Ansible docs doesn't even mention the alternative syntax) over the more pythonic way of using python style conditional expressions supported by the Jinja library. ansible-playbook Run playbooks against targeted hosts. Posted by 22 days ago. Similarly results also depend on the value of variables passed to plays and tasks, facts fetched or created, or the results from past results. Ansible when conditional with Jinja2 statements. defaults - defines default variable values for this role; vars - defines variables for this specific role; handlers - sets up any handlers (conditional tasks) for this role; tasks - defines any tasks run as part of this role (can be divided into multiple files/multiple tasks) templates - defines Jinja templates used for substituting variables Ansible is an easy-to-use IT automation engine. Expression \ Condition var is defined var == None var == '' set_fact: var=None : true: false : false: set_fact: var='' true : false : true: set_fact: var= We will explore ansible. j2 extension, which denotes the Jinja2 templating engine used. Till now, we saw some Ansible playbook examples where we directly passed the I'm currently porting my Ansible playbooks from version 2. Found: stat_logwatch_distribution. One of the commonly used command-line variables is hosts. Close. date }} variable with the date in YYYY-MM-DD format. html file on the remote host. By using Ansible’s lookup module, we query Vault for our secrets and store them in a variable as a dictionary. The template files will usually have the . To represent the variations among those different systems, you can create variables with standard YAML syntax, including lists and dictionaries. In this article, i’ll show the examples of how to test a variable in Ansible: if it exists or not, if it is empty or not and if it is set to True or False . The goal of doing this would be to prevent the controller (in this case AWX) from storing these secrets on it's own disk or in it's own RAM. foo-port, foo port, foo. Ansible - Defining Variables As Dictionaries November 30, 2017 6 minute read This post is to go through an example of defining Ansible variables as dictionaries rather than lists. The templating engine of Ansible is Jinja2, a modern and designer-friendly templating language for Python. python,flask,jinja2. Ansible variables help to determine how the tasks execute on different systems based on the values assigned to these variables. yml -e "param1=value1 param2=value2 param3=value3" If only param1 passed. addess. Use of the command module in this way can in many ways eliminate the need to write site specific facts, for instance, you could test for the existence of a particular program. yml apache : httpd somethingelse : 42 I am using ansible's community. Ansible with jinja template. If variable (dictionary or a list) is undefined - grep -R path_of_your_inventory -e missing_variable; Jinja template debug; Strange behaviour - try to run the code ‘at the destination’ Infrastructure as code. This chapter will cover a few advanced features of Jinja2 templating: Ansible by default uses Jinja2 Templates to call its variables in its playbooks. Conditionals, This is easy to do in Ansible with the when clause, which contains a raw Jinja2 Tip: Sometimes you'll get back a variable that's a string and you'll want to do a If you want to match the whole string and you are using * make sure to always wraparound your regular expression with the start/end anchors. . Defaults to False. Ansible includes a lot of specialized filters and tests for templating. port and 12 are not valid variable names. When: condition1 and/or condition2. ansible -m debug -a "msg={{hostvars[inventory These variable files leverage the Jinja2 templating engine, as it retains the most power to hook into Ansible’s variable and templating engines. 1 to 2. This way, templating offers an efficient and flexible solution to create or alter configuration file with ease. That way you can have all vars conditionally defined in a single file. A quick modification to your /etc/ansible. }} in a when clause. Secondly, that how Jinja2 interprets the if condition: The if statement in Jinja is comparable with the Python if statement. So, you don’t need to use jinja2 delimiter unless you want to print double interpolation as well. By passing variables to a role written this way, we can have the same role perform different tasks or configurations. This config file has a heading for each machine type, and then a series of variables. The variable 'ansible_os_family' is being interpolated into the list of filenames being defined for vars_files. The Purpose The purpose of this post is to give you a real-time example and explanation of how ansible variable is defined and not defined (undefined) conditionals are working along with "when" conditional statement and how it controls the flow of the task and the play. The variables are referenced through the Jinja2 template system, known to many from the Python language. ipv4. Finally, we use the { {}} to output the newly formed list. When you run the task or playbook, Ansible evaluates the test for all hosts. Ansible also offers a new plugin type: Lookup Plugins. cfg in the current directiry Jinja can generate any text-based format (HTML, XML, CSV, LaTeX, etc. This is a snippet from my Ansible jinja template which populates an environment specific template. /templates/ directory where playbook look for template files by default. acr_name (= terraform [‘staging’]. For conditional control, Jinja2 uses the familiar if statements, which have the following syntax: Using Variables¶ Ansible uses variables to manage differences between systems. 0/24 and your ansible_zone is ansible. This is helpful in many situations where you have stored the output of an operation, and you need to manipulate that value. Join Robert Starmer for an in-depth discussion in this video, Variables in roles and variable precedence, part of Ansible Essential Training. Jinja2 comes with a lot of great features: Control structures (loops and conditional statements) Rich set of built-in filters and tests Variables are Register Variables ¶. So if a variable has a string containing HTML like "<p>Escaping in Jinja</p>" then it will be rendered as "<p>&lt;p&gt;Escaping in Jinja&lt;/p&gt;</p>". If the value of ansible_distribution is in the supported_distros list, the conditional passes and the task runs. We can have conditional statements, loops, filters for transforming the data, do arithmetic calculations, etc. e. Below is my code sample. The action again is a Ansible keyword used in yaml. Soon after that, I faced a problem, that was still solvable without writing an Ansible plugin. find("{{rhel_version}}") != -1´´ this conditional string with another way to reference ("{{rhel_version}}") ANSIBLE VERSION The Ansible-packaged ipaddr jinja filter is versatile - it is capable of achieving a larger number of routine IP address manipulations. Posted on 5 Mar 2018 5 Mar 2018 Author Chris Herdt Categories Ansible Tags ansible, jinja2 3 Comments on Using Ansible to check version before install or upgrade Ansible conditional check failed I wanted to add a check to one of my Ansible roles so that an application source would be copied and the source recompiled only if no current version According to Jinja2 documentation you can manage whitespace and tabular indentation with lstrip_blocks and trim_blocks options: trim_blocks: If this is set to True the first newline after a block is removed (block, not variable tag!). Alright! This takes us to the end of our Decision Making in Ansible tutorial. Making variables optional ¶ By default Ansible requires values for all variables in a templated expression. The output was then copied to the index. Here the condition MUST be met before we execute next task. In many cases, you need to do some complex operation with your variables, while Ansible is not recommended as a data processing/manipulation tool, you can use the existing Jinja2 templating in conjunction with the many added Ansible filters, lookups and tests to do some very complex transformations. 5 (devel f96f69ece3) last updated 2013/12/16 16:23:13 (GMT +400) So we first take the variable name ansible_eth0 followed by the key so using dot notation the variable becomes ansible_eth0. Special variables in Ansible Playbook. If the variable is an object, you can print individual object properties using the { { objectVariable. In Ansible, when we need data manipulation, processing, formatting and conversion. when: result|failed. force_basic_auth: Force the sending of the Basic authentication header upon initial request. I'm pretty new to Ansible and I'm having some trouble figuring out how to get a dynamic value assigned to a variable. While this plugin doesn't offer anything for Jinja2 like the other paid Ansible plugin does, the other plugin doesn't even work at all for me. 1), a boolean magic variable which will be set to True if you run Ansible with --check. 5, jinja tests included within Ansible were most often used as filters. In this blog post I'll show how to add items to lists and dictionaries, when using loops, and across tasks. Jinja2 ships with many of these. yml. It supports both conditional expressions and loops. A Basic Example When using jinja2 for SaltStack formulas you may be surprised to find that your global scoped variables do not have ability to be modified inside a loop. These variables are set on a host-by-host basis which is just like ansible facts, discovered by setup module. In many cases, you need to do some complex operation with your variables, while Ansible is not recommended as a data processing/manipulation tool, you can use the existing Jinja2 templating in conjunction with the many added Ansible filters, lookups and tests to do some very complex transformations. As you can see, the index. The following values are considered false: any empty mapping, for example, {}. conditional execution of steps, looping Ansible,YAML, Jinja2 and loops I wanted to use Ansible templates to generate a config file for VAC. If branch == 'test', I will pick the group 'upgrade-CI-test' as targeted_host for my next task, anything other than test will retain the value of the variable "upgrade_version" However, I can't get my play "Remove old scripts from upgrade machine" executed on the test group for some Although if I leave be at just {{ hostvars[host]['ansible_facts'] }} Then I get the output as a single JSON string containing all the keys. last variable that Jinja automatically injects into the. The output was then copied to the index. Often in a playbook it may be useful to store the result of a given command in a variable and access it later. build not in webpage. The "when:" conditional statement doesn't seem to give me the options I want natively, so should I be dropping into only_if and jinja2/python syntax instead? Any other suggestions? Re: [ansible-project] Best way to test for a substring in a variable By default, Jinja automatically escapes the variable output for security purpose. Check out the entire series! To prevent this type of overriding, we can use Ansible's conditional statements, which will override a variable only if it is not defined. The most common implementation of Jinja is the use of filters and variables within playbook YAML files. Data manipulation¶. According to Jinja2 documentation you can manage whitespace and tabular indentation with lstrip_blocks and trim_blocks options: trim_blocks: If this is set to True the first newline after a block is removed (block, not variable tag!). [WARNING]: when statements should not include jinja2 templating delimiters such as {{ }} or {% %} When running code through Ansible check mode (ansible-playbook --check), sometimes it's necessary to skip certain actions (usually API calls banging up against non-idempotent systems). com host3: partner. Some basic Ansible knowledge (concepts, Playbook writing etc) is a plus as the labs are covering Tower-specific topics and not Ansible basics. I have a play which I would like to run only if ansible_hostname is not found in the list of host names in hostlist. It can transform and optimize tasks such as rolling updates with just a few lines of code. Accessing the variables The environment variables of the remote servers can be accessed via ‘facts‘. Jinja2 uses BSD authorization The syntax of Jinja2 UTF-8 Read the continuation of our Ansible series. *) on some Python versions will match the whole string and an empty string at the end, which means it will make two Debugging variables in Ansible can be a pain sometimes, to make it easier there are debug modules to help out with it. As of the writing of this book, Jinja is in use by numerous open source solutions that are actively developed with Python. Normally when trying to add a new item to the variable, while in the loop, or between tasks, Ansible will ovewrite the values, keeping the result of the last iteration. html file on the remote host. Notice the use of Jinja2 templating syntax to load the variable data into the blockinfile. Below you can see the list of default rules Ansible Lint use to evaluate playbooks and roles: Using bare variables is deprecated. mydomain. There will be a dedicated tutorial that discusses Jinja2 in this series but for now you just need to know the very basics. In the background, filters in Ansible are from jinja2, so the input data is transformed inside a template expression. In many cases, you need to do some complex operation with your variables, while Ansible is not recommended as a data processing/manipulation tool, you can use the existing Jinja2 templating in conjunction with the many added Ansible filters, lookups and tests to do some very complex transformations. conf. This allows you to put a line in a deployed file if certain conditions are met. How it works The Jinja variables and expressions indicated using the default delimiters as Ansible uses Jinja2 templating to enable dynamic expressions and access to variables. Hence, it would be useful for us to understand Jinja2 control structures in addition to the ones supported by Ansible tasks. For conditional control, Jinja2 uses the familiar if statements, which have the following syntax: See full list on linuxtechi. Hence, Jinja includes a property of variables called variable scope. Variables should always start with a letter. Conditional if Statement in Jinja2 Template Jinja2 templating language supports conditional if Based on extra vars parameter I Need to write variable value in ansible playbook. Ansible uses Jinja2 which is a modern templating engine for Python frameworks used to generate dynamic content or expressions. This Jinja2 expression can evaluate the value of a variable. ansible. Here in the below method we have not initialized value of the variable “first_name” so we have given default value as “Manmohan” instead. Let’s create a simple playbook to gain familiarity with templating. Applying Jinja in Ansible Playbook's Jinja can be applied to playbooks in a few specific ways. Jinja docs suggest its just an "if variable" [1], so "when: foo" but that doesn't work whenever the variable has a value Ansible detects these as None. resweb. 5 was released. Ansible is an easy-to-use IT automation engine. You may want your Ansible handlers to use variables. However, many organizations aren't using Ansible modules and playbooks in a reusable fashion; they are reinventing the wheel every time they automate. mydomain. From configuration file content to variable substitution in tasks, to conditional statements and beyond, templating comes into play with nearly every Ansible facet. [WARNING]: when statements should not include jinja2 templating delimiters such as {{ }} or {% %} Usually, yes; it's another dependency that needs installation, and for most of the use cases I've had, it's only marginally nicer to use. Hence, it would be useful for us to understand Jinja2 control structures in addition to the ones supported by Ansible tasks. date }} variable with the date in YYYY-MM-DD format. I tried few combinations but didn't work with syntax. docker_compose_mq: <string-passed from Jenkins> docker_compose_profiles: "string" {% if "{{ Ansible uses Jinja2 as a template engine. A Jinja template doesn’t need to have a specific extension: . To prevent this, the following option can be enabled, and only # tasks and handlers within the role will see the variables there #private_role_vars = yes # list any Jinja2 extensions to enable here: #jinja2_extensions = jinja2. Syntax. Now i am looking some help to convert ``until: result. While you can do a lot of complex things in Jinja, only the basics are things you really need to learn at first. These are not boolean values, but rather strings of either 4 or 5 characters long. Conditional if Statement in Jinja2 Template Jinja2 templating language supports conditional if 2. In the simplest form, you can use it to test if a variable is defined, not empty or not false. So I assume that you have already known what are Jinja2 and Ansible and what they do but I write this Article to share with you some hidden features of Ansible and its wonderful colleague Jinja2. The Purpose The purpose of this post is to give you a real-time example and explanation of how ansible variable is defined and not defined (undefined) conditionals are working along with "when" conditional statement and how it controls the flow of the task and the play. Now instead of dot you can also use subscript[] and modify the variable to ansible_eth0['ipv4']['address'] Finally to access the variable inside the ansible playbook we use Jinja2 template using double curly Manage Jinja2 rendering indentation¶ Jinja2 can manage whitespace and tabular indentation with lstrip_blocks and trim_blocks options: trim_blocks: If this is set to True the first newline after a block is removed (block, not variable tag!). j2 extension, which denotes the Jinja2 templating engine used. Variables and Loops; Using Complex Variables in Loops; Variables and Templates; Using variables in conditions; Blocks; Prompts; Getting Creating the Ansible Playbook. In Ansible, we have various modules that work with variables and are used to get or set variable values. html file on the remote host. At the same time, how would you have represented this in a Jinja template? Jinja doesn't allow for nested mustaches in any context that I am aware of. It can transform and optimize tasks such as rolling updates with just a few lines of code. version ~ '-' ~ tomcat. Starting at Ansible 2. register − The output of the action is registered using the register keyword and Output is the variable name which holds the action output. Jinja2 variables and expressions within playbooks and tasks allow us to create roles that are very flexible. rg_name (= terraform [‘production’]. Using a templating language, such as Jinja2, we are able to write playbooks that are succinct and easier to read. Advanced list operations in Ansible Intro. As you can see, the index. Using a variable for a task's 'args' is unsafe in some situations (see https://docs Ansible uses Jinja2 templating to enable dynamic expressions and access to variables. See builtin filters in the official Jinja2 template documentation. The variable is defined in a file in group_vars/all, so it's available in all playbooks (not sure if this is important). For your convenience, here is the list of special variables as of Jinja 2. j2 extension, which indicates the Jinja2 templating machine used. Jinja2 is a widely-used and fully featured template engine for Python. xml, or any other extension is just fine. cfg. There are several useful tests that you can make using Jinja2 builtin tests and filers. Registered variable to Jinja2 conditional not having desired effect in template. Let suppose if the variable is initialed with NULL value. You can do all of these with Ansible conditions, use Jinja2 testing and conditional filters, Ansible supports all standard tests and filters, and adds a unique filter as well. 5. In this context there are several useful tests that you can apply using Jinja2 filters in Ansible. You can use all the standard filters and tests included in Jinja2 as well. do,jinja2. com And then a template that references the dict so: The if statement in Jinja is comparable with the Python if statement. Introduction to Jinja2 Jinja2 is a python-based template engine with functions similar to smarty in PHP, Freemarker and velocity in J2ee. Bug Report; COMPONENT NAME. j2 dest: report. Data manipulation¶. If the value has "lab. All usual operation like addition, subtraction, multiplication, division, and modulo are possible. Ansible greatly expands the number of filters and tests available, as well as adding a new plugin type: lookups. But even attendees new to Ansible should benefit from this lab as the Ansible concepts used should be easy to understand. Conditional Syntax and Logic Single condition. Create the task, then add a when statement that applies a test. In this article, i’ll show the examples of how to test a variable in Ansible: if it exists or not, if it is empty or not and if it is set to True or False . i18n # if set, always use this private key file for authentication, same as # if passing --private Here, we use Ansible's User module to loop over a variable named users_with_items. Since the lookup plugins work only on the local machines, we need some other way to access the variables on the remote servers. According to Jinja2 documentation you can manage whitespace and tabular indentation with lstrip_blocks and trim_blocks options:. This allows you to determine your file template execution flow according to your test conditions. ansible-vault Encrypt sensitive data into an encrypted YAML file. date }} variable with the date in YYYY-MM-DD format. jinja2 template was processed by the Jinja2 templating language and replaced the {{ ansible_date_time. 8: Additive Loops with Ansible and Jinja2 Published on 16 Jul 2018 · Filed in Explanation · 851 words (estimated 4 minutes to read) I don’t know if “additive” is the right word, but it was the best word I could come up with to describe the sort of configuration I recently needed to address in Ansible. }} in a when clause. Almost every entity in ansible Ansible template line endings, This is where Ansible template modules A template in Ansible is a file which contains all your configuration template to honor new lines after a conditional. jinja2 template was processed by the Jinja2 templating language and replaced the {{ ansible_date_time. [elliot@control plays]$ ansible-doc blockinfile [elliot@control plays]$ ansible-doc lineinfile. Finally, you require the playbook file that will drive this workflow. An interesting aspect of the script is that it supports conditional This task copies the Jinja2 template The files in the host_vars folder contain the variables that Ansible should use Ansible supports a few ways of providing configuration variables, mainly through environment variables, command line switches and an ini file named ansible. Then to use other value which is default one then use following jinja2 default method. variable, or you may want to create additional host groups based on whether the host meets other criteria. So that this one works, is free, and handles the most important use cases is a big advantage. Templating is the lifeblood of Ansible. Some systems may want to define some behavior or configuration that are slightly different from others. If you want to manage them you can do it if you set them at the very beginning of your template file as follows: #jinja2: lstrip_blocks: "True (or False)", trim_blocks: "True (or False)" So, if you have following Ansible code for /etc/hosts template: Jinja is leveraged to generate string-based documents based on one or more predefined templates (also made of strings). [WARNING]: when statements should not include jinja2 templating delimiters such as {{ }} or {% %} Jinja2 is a very popular and powerful Python-based template engine. I also see the same behaviour when I define variables in the same way in inventory or group_vars/all but not in the playbook. Ansible now prints a warning if I use jinja templating delmiters such as {{ . To demonstrate, go to your templates directory and create the following selinux. Both strings then are seen as true values, as they are non-empty. We reference the value of a variable in Jinja2 by placing its name inside double curly braces “{{ }}“. To prevent that, the comma is conditionally added for all but the last element by checking for the special loop. checksum != {{ task }} ISSUE TYPE. ). msg − Displays the message. Please note that all templating happens on the Ansible controller before the task is sent and executed on the target machine. ansible-playbook playbook. It is fast, reliable and widely used for dynamic file generation based on its parameter. For sequences, (strings, lists, tuples), use the fact that empty sequences are false. 1. Navigate to role declaration (Ctrl + B for Windows, Alt + Cmd + B for macOS) Navigate to variable definition (Ctrl + B for Windows, Alt + Cmd + B for macOS) Using variables with handlers. This allows you to sort through defined variables to inject dynamic values into your template. The purpose of this post is to give you a real-time example and explanation of how ansible variable is defined and not defined (undefined) conditionals are working along with “when” conditional statement and how it controls the flow of the task and the play. Jinja Template: Ansible uses Jinja2 templating to enable dynamic expressions and access to variables. The variables in a template file will be denoted by the double curly braces, ‘{{ variables }}’. Found: stat_logwatch_distribution. This bug is closed and is unresolved. The template files are usually have the ‘. 7. Data manipulation¶. This time Marcin Ślęczek covers Variables and Jinja2 Template. It is very flexible. when: (condition) Example. This will cause the HTML tags to be displayed in the browser instead of interpreted. The variable supported_distros was created by the playbook author, and contains a list of operating system distributions that the playbook supports. Introduction to Ansible Conditional. stat. The other pauses execution until condition is met, and failing task if it isn't, to ensure desired state is in place before proceeding. With the nested configuration, the Jinja template will set the following values of the variables. However, if I had to do a lot of merging, or a very hairy merge, a plugin would probably be a lot more efficient, especially considering I could break into real Python code to do the work (less annoying than working with the Python-in-Jinja2-in-Ansible YAML!). Prior to Ansible 2. The output was then copied to the index. A template contains variables and/or expressions, which get replaced with values when a template is rendered; and tags, which control the logic of the template Of course, the value of a toplevel variable doesn't necessarily exist in its own right as a variable and cannot be found (and - if found - could potentially cause other issues), and if the value of the toplevel variable contains any characters that have a special meaning to jinja2 (slashes, dots, spaces ), the jinja2 parser fails as well, for Jinja¶. xml, or any other extension is just fine. Ansible Jinja template if statement. stat. html file is created and as you can see, the variable ansible_hostname has been replaced by the actual hostname of the server, in this case, Centos-7. In the following example, the task will only run when the variable test1 contains the string “World”. For example, if the name of a service varies slightly by distribution, you want your output to show the exact name of the restarted service for each target machine. We can use variable. It is similar to: command line variables always win, then shell environmental ansible variables, then multiple levels of ansible yaml file rules, then finally a role's defaults/main. You can use all the standard filters and tests included in Jinja2 as well. These are builtin variables which cannot be set by the user and which Ansible will always override. ext. For example, if the name of a service varies slightly by distribution, you want your output to show the exact name of the restarted service for each target machine. However, you can make specific variables optional. 2. This variable contains names and information about two users, but the task only ensures the users exist on the system, it does not create directories contained in each user's list of personal_directories (note that personal_directories is just an arbitrary key in We use a conditional ( {% if %}, {% endif %}) to replace the shell that inserts the line for hosts where “hd” is in the first two characters of the hostname. Ansible uses the Jinja2 templating system to work with variables. Highlighting and inspection of deprecated Ansible modules; Inspection for jinja variables - warn if there isn’t any variable defined. ). Ansible: Exclude ansible conditional variable ansible block ansible when string contains ansible if else ansible failed_when ansible when variable is defined ansible loop block ansible variables When Ansible encounters an if block, and the if condition involves the groups variable, it seems to expand the contents of the block before it has evaluated the if Jinja2 templates If condition not working correctly. In this section, we will discuss conditional logic specifically and learn how to leverage it within the context of Jinja. Jinja2 template with conditionalsJinja2 can also be used with conditional statements What’s the best way to use registered variable ‘audit_tools’ to check if all items are own by root ? Do I need to use Jinja2 filter or something ? Thanks - name: Verify audit tools are own by root Ansible 1. The simplest conditional command applies to a single task. Example Like in #56830 when I place conditionals in a variable and then use that in a 'when' condition, I get the error: [WARNING]: conditional statements should not include jinja2 templating delimiters such as {{ }} or {% %}. For example, we might want to create a unique MOTD file by adding some additional information to the MOTD contents based on perhaps the hostname. Usage of variable - {{Output}} Ansible uses Jinja2 templating to enable dynamic expressions and access to variables. . jinja2 template was processed by the Jinja2 templating language and replaced the {{ ansible_date_time. cfg: [defaults] jinja2_extensions = jinja2. For example, you might want to use a system default for some items and control the value for others. The when clause is a raw Jinja2 expression without double curly braces (see group_by – Create Ansible groups based on facts). Good evening, I have alot of hosts, on a given maintenance activity, I need to do config management on 40,000 hosts, and growing, which are network devices, specifically Nokia fiber switches, not servers, usually in batches of 5-10K when I use Python. Using list filters was enough, yet the task definitely wasn’t simple. rg_name) will be set to prod-ae-rg. {% if finished %} { { result }} {% endif %} In our example we see that because we can’t call the variable outside of the inner loop, the counting didn’t work. Many other Python web frameworks also use it as well as countless other Python projects. Template files will usually have the . Ansible uses the Jinja2 templating language to enable dynamic expressions and access to variables. com" keyword in it, it should directly store the value to "host_fqdn" again or else it should add "lab. One such important module is set_fact. txt delegate_to: localhost run_once: true Ansible When Variable is defined or undefined Examples. 2020 A simple task, or so I thought: in a Jinja template keep track of the number of items in a loop. For example, if your IP range is 192. This file can be located at different location while the highest precedence is given to ANSIBLE_CFG variable followed by ansible. The output was then copied to the index. Jinja2's syntax encloses the control structures inside the {% %} blocks. It can contain Jinja2 filters, and it can also include logical operators and groupings. Tl; dr; from this bug: Filter default works only one level deep. [WARNING]: when statements should not include jinja2 templating delimiters such as {{ }} or {% %} Jinja can generate any text-based format (HTML, XML, CSV, LaTeX, etc. Avoid placing variables in the name of the handler. I'm currently porting my Ansible playbooks from version 2. Syntax. mydomain. html, . However, many organizations aren't using Ansible modules and playbooks in a reusable fashion; they are reinventing the wheel every time they automate. I'm following a scheme where I have hostnameXX where XX is a number, and different values are assigned from a vault file based on that number. existence of package or feature, or value of pre-defined variable. Through Jinja2, we can use python to make a new list, with the value we want and append the previous list to it. cfg configuration file used in Ansible. Because variables can be set anywhere are everywhere, this can lead to confusing and hard to debug situations with variable name clashes, until precedence Re: Issues with an jinja and magic variables script please help Jump to solution Thank you all the issue came to be I needed to use ansible_devices instead of devices. In many cases, you need to do some complex operation with your variables, while Ansible is not recommended as a data processing/manipulation tool, you can use the existing Jinja2 templating in conjunction with the many added Ansible filters, lookups and tests to do some very complex transformations. yml files OR *{pkg_mgr}. In Ansible, we mostly fetch and used at a from remote target nodes and then use this data to make the decision to execute play sort asks. Ansible includes a lot of specialized filters and tests for templating. For example, in a simple template, you can do something like: My amp goes to { { max_amp_value }} Using Ansible-provided jinja tests as filters will be removed in Ansible 2. Not only replacing variables but we can do lot more with jinja2 template like conditional statements, loops, filters and lookup etc for data transformation. #used the alternative solution tomcat. The creation and processing of these templates is called Rendering. The rest of this page describes YAML configuration, Ansible playbook, and Jinja2 template I used to remove configuration section from Cisco IOS device configuration with regex matches (the full source of the playbook can be found on github). jinja2 template was processed by the Jinja2 templating language and replaced the {{ ansible_date_time. Example. ansible_facts[‘distribution’] ansible_facts[‘distribution_major_version’] ansible_facts[‘os_family’] Often the result of a play may depend on the value of a variable, fact (something learned about the remote system), or previous task result. do,jinja2. However, if you're using Ansible variables, even thought you might have defined some of them as False they might still be treated as True as Jinja2 may simply see them as string variables. In this context there are several useful tests that you can apply using Jinja2 filters in Ansible. jarv changed the title Ansible string variable values that contain dashes in the value yield unexpected results when used in a conditional Ansible string variable values that contain dashes yield unexpected results when used in a conditional Dec 11, 2014 As you can see, the index. You can have conditional statements, loops, write macros, filters for transforming the data, do arithmetic calculations, etc. The Purpose. The simplest conditional statement applies to a single task. Nested jinja pattern. propertyName }} syntax. Also, the values written here will be having implicit double interpolation, as this option runs in the jinja2 context. 1 to 2. yaml with the following content. Defaults to False. We will use our existing playbook from last exercise to first understand how when condition works: In Jinja2 templates, it is often a good practice to test if a variable exists and what value does it carry. Amazing Collection of Modules As you can see, the index. In addition to those, Ansible supplies many more. Jinja2 template with Conditionals. 4 the ansible-config utility allows users to see all the configuration settings available, their defaults, how to set them and where their current value comes from. 2. You converted the variable known to a string; it'll contain either the string value 'True' or 'False'. do this for both yum and apt, as passed from AWX/Tower; pass {variable}. local, the filter in the task above creates a name in a single line: Expression starts with “gateway” Variable names should be letters, numbers, and underscores. foo_port is a great variable. The variables will contain the value returned by the task. Bug Report; COMPONENT NAME. stdout. com" keyword to the value and st The task is only executed if this Jinja2 expression evaluates to true. always − Again a Ansible keyword , it states that below will always be executed. Avoid placing variables in the name of the handler. 7. ANSIBLE VERSION the trailing endif omits the line break. com Some notable examples of applications using Jinja2 are Ansible, Django, Flask, Salt and Trac. One is conditional execution, usually based on static check, i. In many ways, this is similar to variable declarations, although registers are more global in nature. html file on the remote host. You may want your Ansible handlers to use variables. There will be a dedicated tutorial that discusses Jinja2 in this series but for now you just need to know the very basics. Ansible jinja2 template: How to loop through sub-elements of interface facts. I wanted to throw this together as I have not found a decent example of doing this. As you can see, the index. 1 to 2. yml file with a play that sets up the variables you need using when clauses, and then importing (or including) them in your main playbook. content but its not taking the value from the variable file Re: [ansible-project] JInja Warning using when condition Module 10 - Ansible and Jinja. Conditional logic in code form might look something like the following (Python code): I'm using to fetch the status of the few services using ansible and generating the HTML output using ansible jinja template, I'm getting variable undefined or some other error, Here I'm storing the values in the register module and then fetching those values in template, but it's not working . foo5 is fine too. when: ansible_os_family == "Debian" when: ansible_pkg_mgr == "apt" when: myvariablename is defined; Boolean Filter. Conditional if Statement in Jinja2 Template Jinja2 templating language supports conditional if Ansible embeds the that can be used to dynamically: Set and modify play variables Conditional logic Generate files such as configurations from variables Jinja2 templating engine Ansible When Variable is defined or undefined Examples. Using variables with handlers. The Ansible Fact is then loaded into a file using the Ansible blockinfile module. 1 to 2. resweb. To get a list of unique system variable names run the command # ansible -m setup hostname. However, generally, the variables defined in your templates will have a defined scope only inside a certain block, such as inside a for loop The "when:" conditional statement doesn't seem to give me the options I want natively, so should I be dropping into only_if and jinja2/python syntax instead? Any other suggestions? Re: [ansible-project] Best way to test for a substring in a variable As already referenced in the variables section, Ansible uses Jinja2 templating to enable dynamic expressions and access to variables. All templating happens on the Ansible controller before the task is sent and executed on the target machine. We will discuss more about conditional statements in later chapters. Ansible also uses the Jinja2 template engine to evaluate variables in playbooks. find for checking the contents. }} in a when clause. . Jinja2 was incorporated into the Ansible architecture back in 2012 when Ansible 0. You can have conditional suggestions, loops, write macros, filters to transform data, numeric calculations, etc. Jinja2 is a modern and designer-friendly templating language for Python frameworks. Although this is counter intuitive given the scope behavior of most scripting languages it is unfortunately the case that a jinja2 globally scoped variable cannot be modified from an inner scope. Example of adding a variable in springular. Jinja2 uses the double curly braces { { }} to enclose a variable that has been defined. A Jinja template doesn’t need to have a specific extension: . Special Variables. We’re going to create a new playbook for accessing our secrets from Vault. 3 Conditional Execution -- Very complete example with comments -- I find the conditional expressions to be ridiculously hard to get right in Ansible. 0. Please You can use arithmetic calculations in Ansible using the Jinja syntax. 9. In the previous entry, I gave you an overview of how you can do all the basic operations on lists in Ansible. There is a sublist called ‘ansible_env’ which has all the env variables inside it. i18n {% if this is that %} - Conditional statement; The first is an example of Jinja2 value substitution, and is likely the most prevalent Jinja2 element you will be using. The group_vars folder and the variable files were explained to show different ways variables can be used with both Ansible and the Jinja2 templating engine. Ansible devs have disabled this feature because of When the playbook is executed, a new index. var: – This accepts strings as input and this is the variable that has been set either by Ansible facts or by the playbook. This means that for subsequent actions to be evaluated in check mode variable values need to be provided as if the skipped action had actually taken place. Loop over Ansible variable array in Jinja2 template. 168. After you perform the wizard, a new index file is created. Since Ansible is written in Python, it becomes the default choice for most users, just like other Python-based configuration management systems, such as Fabric and SaltStack. Ansible provides a list of predefined variables that can be referenced in Jinja2 templates and playbooks but cannot be altered or defined by the user. Ansible now prints a warning if I use jinja templating delmiters such as {{ . Create a file named variable_writer_pb. myvariable: 'param1,param2' If param1,param2,param3 are passed then variable value will be Referencing current variable in Ansible conditional statement? Ask Question Asked 3 years, 10 months ago. Viewed 31k times 16. As ansible evolved, so did its developer support for Jinja. com host2: beta. Some of the modules like Pass variable to jinja template ansible Documentation can't be provided while automation is available to make things easier to do, it's likely that all your systems aren't exactly the same. Re Ansible conditional lists. We split each level of ‘default’ into separate variable. Conditional if Statement in Jinja2 Template Jinja2 templating language supports conditional if python,jinja2,ansible. Using Variables: About Jinja2 ¶ It’s nice enough to know about how to define variables, but how do you use them? Ansible allows you to reference variables in your playbooks using the Jinja2 templating system. The playbook uses the following variables to describe the configuration sections that have to be removed. I don't have a good model of what's going on under the surface so I often get it wrong. Stay tuned for next tutorial as you are going to learn how to use Jinja2 Templates to manage files and configure services dynamically in Ansible. yml. Use namespace as global variable in Ansible Jinja templates Posted by Andreas 'ads' Scherbaum on Thursday, July 9. $ ansible --version ansible 1. This module is used to set new variables. And finally, ansible_check_mode (added in version 2. A template contains variables and/or expressions, which get replaced with values when a template is rendered; and tags, which control the logic of the template Jinja Templating - Line 31 defines the Jinja template of our configuration file where we can add variables and also perform various operations like looping adding conditional statements etc . It can fully support unicode, and has an integrated sandbox execution environment, which is widely used. Exclude warning for passwords and api keys. Before you could override Jinja2 evironment settings by placing #jinja2: variable_end_string: [[, variable_start_string: ]] on the first line of a template file so that {{ }} weren't not treated as tags. Sample playbook: - name: debug test debug: msg: "FAIL" when: something happened earlier in the playbook register: debug_results - name: Create report template: src: template. Ansible greatly expands the number of filters and tests available, as well as adding a new plugin type: lookups. Let us start with an example. Multiple Conditions. yml file of the role, find all files with {repo}_{pkg_mgr}repo. }} in a when clause. On your Jinja2 template, you can print the value of a variable using the { { variableName }} syntax. Some variables have their scope defined as Global, which denotes that they are defined and accessible in all of your template code. The implementation of Ansible at the time incorporated the concept of Jinja2 filters and supported basic Jinja2 syntax. Some notable examples of applications using Jinja2 are Ansible, Django, Flask, Salt and Trac. Instead of setting these to sensitive values directly, we can use Jinja2 templating statements to reference the encrypted variable names from within our unencrypted variable file. date }} variable with the date in YYYY-MM-DD format. Ansible now prints a warning if I use jinja templating delmiters such as {{ . in the main. Conditional if Statement in Jinja2 Template Jinja2 templating language supports conditional if That is a good way of thinking of explaining it in the context of Ansible -- start Jinja, stop Jinja. The output was then copied to the index. Ansible when conditional with Jinja2 statements. I'd like a dict to do something like: Certmapping: host1: www. You can prepare a separate. What is so good about it? Jinja2 comes with a lot of great features: Control structures (loops and conditional statements) Rich set of built-in filters and tests You can use Ansible facts, variables, and user-defined variables in your Jinja2 templates. In this blog, I like to share how and where jinja2 template language used in Ansible and how we can create better Ansible playbook. The common return values are documented in Ansible docs. 7. In the simplest form, you can use it to test if a variable is defined, not empty or not false. Ansible’s approach to configuration – separating variables from tasks, keeps your playbooks from turning into arbitrary code with ugly nested ifs, conditionals, and so on - and results in more streamlined & auditable configuration rules – especially because there are a minimum of decision points to track. It’s usually used in this form: If we omit ‘is defined I want to set a jinja2 variable based on the hostname of a server (I'm using different certs and want to have ansible create the ssl. Some notable examples of solutions that use Jinja include Salt, Flask, and Ansible. In many cases, you need to do some complex operation with your variables, while Ansible is not recommended as a data processing/manipulation tool, you can use the existing Jinja2 templating in conjunction with the many added Ansible filters, lookups and tests to do some very complex transformations. html, . ext. Variable File Separation ¶ It’s a great idea to keep your playbooks under source control, but you may wish to make the playbook source public while keeping certain important variables private. Registering variable: When you execute a task and save the return value in a variable for use in later tasks, you create a registered variable. Jinja provides us with a set of operators that allow us to loop or conditionally execute code. Filters in Jinja2 are a way of transforming template expressions from one kind of data into another. Like in #56830 when I place conditionals in a variable and then use that in a 'when' condition, I get the error: [WARNING]: conditional statements should not include jinja2 templating delimiters such as {{ }} or {% %}. The library used by the uri module only sends authentication information when a webservice responds to an Data manipulation¶. This could be easily achieved via the following ansible playbook and Jinja syntax. Variables in a template file will be indicated with double hooks, '{{ variables }}'. 2. # python style conditional expressions - debug: msg="{{ variable if variable is defined else omit Search keyword in "host_fqdn" variable. So you should, and even encouraged to use the built-in bool filter. It renders to the following: I'm currently porting my Ansible playbooks from version 2. ---# create a list of variables and assign that variable to an ansible # fact. cfg file and a small change to your template, and we can get this working. NOTE: Dictionaries are composed of key: value pairs. Register Variables; Commonly Used Facts. Jinja2's syntax encloses the control structures inside the {% %} blocks. I'm currently porting my Ansible playbooks from version 2. ansible jinja variable conditional

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