For example: When combining conditionals with a loop, the when: statement is processed separately for each item. You can force lookup to return a list to loop by using wantlist=True, or you can use query instead. (0 indexed), The number of iterations from the end of the loop (1 indexed), The number of iterations from the end of the loop (0 indexed). with_together is replaced by loop and the zip filter. You can specify the name of the variable for each loop using loop_var with loop_control: If Ansible detects that the current loop is using a variable which has already been defined, it will raise an error to fail the task. Ansible loop is used to repeat any task or a part of code multiple times in an Ansible-playbook. If you iterate over huge dictionary Ansible’s output is real mess. We can have conditional statements, loops, filters for transforming the data, do arithmetic calculations, etc. We have not deprecated the use of with_ - that syntax will still be valid for the foreseeable future. Active 3 years, 10 months ago. The default value for “retries” is 3 and “delay” is 5. You can register the output of a loop as a variable. [gituser@ip RTR-TEMPLATE]$ ansible-playbook site.yml PLAY ... After the template line is 'with_items:'; with_items is an iterator (it acts like a for loop where the variable 'item' will be set to equal one of with_items elements on each iteration). Jinja2 provides filters which change the output format for template expressions (for example, to JSON). These examples show how to convert many common with_ style loops to loop and filters. The "fatal" loop task loses data that one should reasonably expect to find in the register variable. Last updated on Jan 12, 2021. Now let’s create a full example that shows off the power of for loops in Jinja2. Jinja2 can be a pain, but ultimately a very powerful tool. However, they are not always easy to use effectively and correctly. Ensuring list input for loop: using query rather than lookup, Tracking progress through a loop with index_var, Defining inner and outer variable names with loop_var. It doesn't continue past the failed item, even though "failed" outcomes do, and templating errors can be specific to the item in the loop.. Usually, the template files will have the .j2 extension, which denotes the Jinja2 templating engine used. And so on. Now for the j2 template itself varloop.j2: In this j2 template we are attempting the following: looping over the list of colours and attempting to run a nested loop inside, that counts the number of people who’s favourite is the colour of the current loop iteration, listing all of the things that are of the colour of the current loop iteration. We get an output that is not what we expect. It can be used to iteratively go through the values of a list, dictionary etc. So let’s move on. Note: You can use Jinja2 loops and conditionals in Ansible templates, but not in Ansible Playbooks. Using lists in Ansible templates. Jinja templates in Ansible can be very powerful. with_flattened is replaced by loop and the flatten filter. repeating a polling step until a certain result is reached. With the release of Ansible 2.5, the recommended way to perform loops is the with_sequence is replaced by loop and the range function, and potentially the The real power of Ansible, however, is in learning how to use playbooks to run multiple, complex tasks against a set of targeted hosts in an easily repeatable manner. Accessing Ansible Variables with Jinja2 Loops 03 January 2018. The item from the previous iteration of the loop. It is not yet a full replacement for with_, but we recommend it for most use cases. Viewed 1k times 1. The loop_control keyword lets you manage your loops in useful ways. Have a question? Now we write a simple playbook that will call on a Jinja template we will write. Common Ansible loops include changing ownership on several files and/or directories with the file module, creating multiple users with the user module, and repeating a polling step until a certain result is reached. This block allows us to use the update function to update an element in a dictionary variable. Variable Filters. As of Ansible 2.8 you can get extended loop information using the extended option to loop control. If you get stuck … reach out! Ansible offers two keywords for creating loops: loop and with_. The benefit of using the template module, rather than the copy module, is that the Ansible template module can use the Jinja2 templating language.Jinja2. You can define the list directly in the task: You can define the list in a variables file, or in the ‘vars’ section of your play, then refer to the name of the list in the task: Either of these examples would be the equivalent of: You can pass a list directly to a parameter for some plugins. If there is sensitive data in loop, set no_log: yes on the task to prevent disclosure. For example, when looping through the output of the "show ip bgp sum", we want to use just an IP of the peer as an input in another task. This is a very simple playbook where we just iterate over a loop of items and echo the individual item. I try it like this: (% for mounts in {{ ansible_mounts }} %) Mountpoint: {{ ansible_mounts.mount }} (% endfor %) But it does not work. We need to have two parameters when using the Ansible Template module, such as: src: The source of the template file. I'm using for in template file {% for vhost in item %} server = {{vhost}} {% endfor %} With items use with_items in file yml ansible. If the result of any attempt has “all systems go” in its stdout, the task succeeds. In computer programming, this is called a loop. SUMMARY. by Shahriar Shovon The Ansible template module is mainly used to copy files from the Ansible client (where Ansible is installed) to the Ansible hosts (managed by Ansible). The Ansible inventory sets a VENDOR_MODELhost variable for each machine: For use in playbooks (and in templates) Ansible automatically puts it into the hostvars dictionary. The for loop in the Jinja2 template file – example2_template.j2 – is as shown When the playbook is executed, the loop iterates over the car list, and prints out the car models in the destination file. The loop keyword requires a list as input, but the lookup keyword returns a string of comma-separated values by default. Sometimes, though, just expanding pre-defined variables is not good enough. There are a couple of things that you need to keep in mind, a included task that has it’s own with_ loop will overwrite the value of the special item variable. A much more powerful way to manage files is to template them. included tasks/roles can overwrite variables from basically anywhere. Does the _ mean you dont have to name the parameter when using it? In my case each iteration produced about 3k output, and it pushed full jenkins output way over 2Mb for my project. Hope this helps you out in your template writing. The current iteration of the loop. So what I want to do is: In a template I want to loop over all the objects in the array and output the values of each "mount" key. File: Playbook.yml - hosts: all vars: list1: ['Apple','Banana','Cat', 'Dog'] tasks: - name: Template Loop example. While using loops in Ansible, by default, output contains the entire content of the item being processed. To limit the displayed output, use the label directive with loop_control: The output of this task will display just the name field for each item instead of the entire contents of the multi-line {{ item }} variable. To loop over a dict, use the dict2items: Here, we are iterating over tag_data and printing the key and the value from it. Ansible Jinja Warrior - Mastering "Loop Variable Scope" Average Reading Time: ~6 minutes 0 Comments. Generally speaking, any use of with_* covered in Migrating from with_X to loop can be updated to use loop. So, let’s dive right into it. It can be a relative and absolute path. This differs from the data structure returned when using register without a loop: Subsequent loops over the registered variable to inspect the results may look like: During iteration, the result of the current item will be placed in the variable: You can use Jinja2 expressions to iterate over complex lists. The use of a well supported and powerful template library to supplement Ansible’s automation and remote control features provides a wide range of opportunities to output pretty complex files with a reasonable amount of effort. Jinja templates in Ansible can be very powerful. See the output here: In our example we see that because we can’t call the variable outside of the inner loop, the counting didn’t work. ansible_hostnameis just another regular variable expansion. The benefit of using the template module, rather than the copy module, is that the Ansible template module can … Hi all, I think I'm just being dumb here, but I cant find anything that explicitly answers my question. In the next example, I’ll be using the template module to print all the items present in a list using the for the loop. Change to your templates directory and create the following hosts.j2 template file: These include lineinfile and blockinfile, among others. Undefined during the first iteration. You must set the until parameter if you want a task to retry. It's really important to know how Jinja2 works if you want to create powerful templates for your playbooks. It will not modify the banner. using for loops for configs of reverse proxies like HAProxy or Nginx; using variables is useful to share the same templates for prod/stg/dev environments; Important points As I explained template module is very convenient, but as long as it modifies original files at execution of Ansible, there is a possibility of miss configurations. This option will expose the following information. To see the results of individual retries, run the play with -vv. with_dict can be substituted by loop and either the dictsort or dict2items filters. They can also be a leading contributor to hair loss. Before Ansible 2.5, most playbooks used a different syntax for loops. This config file has a heading for each machine type, and then a series of variables. For role authors, writing roles that allow loops, instead of dictating the required loop_var value, you can gather the value via: In most cases, loops work best with the loop keyword instead of with_X style loops. Most of the packaging modules, like yum and apt, have this capability. Undefined during the last iteration. Basically, minimum of two parameters are required while using template module in ansible. This also applies to loops. Jinja2 uses the double curly braces { {... }} to enclose a variable that has been defined. The with_ keywords rely on Lookup Plugins - even items is a lookup. For example: Check the module documentation to see if you can pass a list to any particular module’s parameter(s). We have specified an array called ‘ packages ‘ that contains a list of packages that need to be installed. with_sequence is replaced by loop and the range function, and potentially the format filter. With the introduction of Ansible Collections, we gained a lot more control over the content we use in our Ansible playbooks. This enables you to use variables, such as Ansible facts, to customize a particular file for a specific server. If until is not defined, the value for the retries parameter is forced to 1. Ansible uses Jinja2 which is a modern templating engine for Python frameworks used to generate dynamic content or expressions. SUMMARY late template expansion turns the lack of variable scopes into a problem under certain conditions. with_subelements is replaced by loop and the subelements filter. You can create nested loops using with_nested. Consider the playbook below where we have a list of packages that need to be installed. As you can see we have 2 dictionary variables defined. Be careful when changing with_items to loop, as with_items performed implicit single-level flattening. We could either use what Ansible package delivered or resort to things like distributing Ansible modules in roles (which we consider an ugly hack around Ansible's limitations). The Ansible template module is mainly used to copy files from the Ansible client (where Ansible is installed) to the Ansible hosts (managed by Ansible). Along with marketing and website responsibilities, Tim’s focus at Arctiq is in the following key areas: jinja2_extensions = jinja2.ext.do,jinja2.ext.i18n, Arctiq, 41 Britain Street, Suite 302, Toronto, ON, M5A 1R7, Canada, Microservices - Anthos, GKE, Openshift, Kubernetes, Docker, CI/CD, Foundations - Red Hat Enterprise Linux, VMware, Cloud (GCP, AWS, Azure), Integrated Security - Satellite, image hardening, custom provisioning, DevOps Consulting - Team and culture improvements, workflow and process improvements. Tim has spent the bulk of his career in the solution architecture space, problem solving and designing solutions to meet very specific needs. ansible Nested loops Example. Earlier-Style Loop Keywords. Ansible will look for jinja2 template files in your project directory or in a directory named templates under your project directory. Multiple loop keywords were provided, which were prefixed with with_, followed by the name of an Ansible look-up plug-in (an advanced feature not covered in detail in this course). The item from the following iteration of the loop. Stop by the google group! 2. Why? To control the time (in seconds) between the execution of each item in a task loop, use the pause directive with loop_control: To keep track of where you are in a loop, use the index_var directive with loop_control. with_items is replaced by loop and the flatten filter. We are looking to improve loop syntax - watch this page and the changelog for updates. with_random_choice is replaced by just use of the random filter, without need of loop. with_indexed_items is replaced by loop, the flatten filter and loop_control.index_var. The template module also copies a file to a remote server, but it allows you to use Jinja2 to render a template to a file dynamically. dest: destination of templated file in remote hosts. Active 1 year, 8 months ago. Here’s an example: This task runs up to 5 times with a delay of 10 seconds between each attempt. So in each loop iteration of the colours variable, we are able to now add a new element that contains the number of people who deem this their favourite colour. We are NOT able to extract the value of the colour_count variable outside of the inner loop where we are performing the count. Notice how the for loop in Jinja2 mimics the syntax of Python’s for loop; again don’t forget to end the loop with {% endfor %}. Common Ansible loops include changing ownership on several files and/or directories with the file module, creating multiple users with the user module, and For example, a loop can combine nested lists: You can use the until keyword to retry a task until a certain condition is met. The bare metal machines we use as the basis for our OpenStack infrastructure have different capabilities. In this section, we will explore how to make practical use of loops in your Ansible playbooks. For example: When you use register with a loop, the data structure placed in the variable will contain a results attribute that is a list of all responses from the module. I have problem! Having worked across many vertical and technology areas, Tim applies this expertise to his work with Arctiq’s clients. It includes the creation of multiple users using the user module, installing multiple packages using apt or yum module or changing permissions on several files or folders using the file module. (1 indexed), The current iteration of the loop. Ansible Template Module Example. loop.index: The current iteration of the loop (1 indexed). When a variable value changes, you simply reflect that change in your variables file instead of having to make any changes to your actual template. You may need to use flatten(1) with loop to match the exact outcome. Template files bear the .j2 extension, implying that Jinja2 templating is in use. During a recent consulting project with a customer, focused on network automation, we embarked on a journey to re-evaluate how routers were provisioned. The double curly braces will denote the variables in a template file, '{{variables}}'. That might sound confusing to the new Ansible user, so I'll break it down a bit through an example. Loop dictionary in ansible template. [student1@ansible closed_loop_incident_mgmt]$ ansible-playbook demo_setup.yml After this step, log into your tower instance and verify that the 2 “SNOW” job templates are present: SNOW-Demo-Compliance-Check - this Job Template will check for the banner being in compliance. Ansible has a number of modules that can be used to modify existing files. You should know the concept of Ansible playbooks, aware of the ad-hoc commands and know the basic terminology associated with Ansible like list, dictionaries etc. Mainly the ability to have a variable’s value accessible outside of the loop that is currently being run. Looping over lists. We added loop in Ansible 2.5. Today we're gonna work with: loop.index: The current iteration of the loop. If you have a list of hashes, you can reference subkeys in a loop. The loop keyword is equivalent to with_list, and is the best choice for simple loops. (we unlocked this with that extensions line in our ansible.cfg file)  In our case we are updating the colour of the current loop iteration to include a new key/value pair called people_count. A significant part of this initiative was to dynamically create configuration templates for routers, based on variable input. It is possible to use this in ansible templates also using the jinja2 format. Why? I have also used ansible facts to get the IPv4 address from the managed node and place it in the vsftpd.conf just for reference purpose. (1 indexed) loop.length: The number of items in the sequence Two different examples for different files: /etc/hosts and workers.properties: /etc/hosts We want to generate the following snip… First, add the following line to your ansible.cfg:--- [defaults] jinja2_extensions = jinja2.ext.do,jinja2.ext.i18n © Copyright 2019 Red Hat, Inc. Ansible 2.5 introduced a new Jinja2 function named query that always returns a list, offering a simpler interface and more predictable output from lookup plugins when using the loop keyword. In computer programming, this is called a loop. There is more to come! The loop syntax is usually best expressed using filters instead of more complex use of query or lookup. There are filters available for languages such as YAML and JSON. Templating is extremely useful when creating custom configuration files for multiple servers but unique for each of them. We use this information to set up host aggregates. First add the following line to your ansible.cfg: Then modify your varloop.j2 file like this: Notice the “do” block in the updated template. (1 indexed) loop.length: The number of items in the sequence Two different examples for different files: /etc/hosts and workers.properties: /etc/hosts We want to generate the following snip… For loop in Ansible Template. This can result in a great amount of verbosity if the item is a dictionary or is otherwise long. Referencing variables in your templates is a great way to keep your Ansible playbook logic separate from your data. For example, instead of doing: Repeated tasks can be written as standard loops over a simple list of strings. The playbook is called varloop.yml: The playbook simply uses the variable file we specified and calls the template module in a task to build a file called output.txt from a j2 template. In most cases, Jinja2 template files are used for creating files or replacing configuration files on servers. Behavior of failures inside of loops is inconsistent between "fatal" and "failed" outcomes. When available, passing the list to a parameter is better than looping over the task. When you run a task with until and register the result as a variable, the registered variable will include a key called “attempts”, which records the number of the retries for the task. Today we're gonna work with: loop.index: The current iteration of the loop. Ask Question Asked 4 years, 7 months ago. Sometimes you want to repeat a task multiple times. Ask Question Asked 3 years, 10 months ago. A quick modification to your /etc/ansible.cfg file and a small change to your template, and we can get this working. See Basic conditionals with when for examples. To loop over your inventory, or just a subset of it, you can use a regular loop with the ansible_play_batch or groups variables: There is also a specific lookup plugin inventory_hostnames that can be used like this: More information on the patterns can be found in Patterns: targeting hosts and groups. #we can further add more parameters as follows owner: user_name group: user_group mode: u+rw,g-wx,o-rwx In our example we see that because we can’t call the variable outside of the inner loop, the counting didn’t work. The template files will usually have the.j2 extension, which denotes the Jinja2 templating engine used. with_nested and with_cartesian are replaced by loop and the product filter. A quick modification to your /etc/ansible.cfg file and a small change to your template, and we can get this working. Please keep in mind that it is not possible to set variables inside a block and have them show up outside of it. You can use the cat command to examine the output and verify where the models exist in … In developing the j2 (the Jinja2 templating language) logic to do things like calculate bandwidth figures, we ran into some limitations. However, by default Ansible sets the loop variable item for each loop. src: source of the template file which is ./templates by default. Author: Tim Fairweather. During a recent … Viewed 41k times 13. Apart from that, you can perform conditional statements such as loops and if-else statements, and transform the data using filters and so much more. Non-optimal yum, slower and may cause issues with interdependencies, Place the result of the current item in the variable, Retry a task until a certain condition is met, result.stdout.find("all systems go") != -1, Show all the hosts matching the pattern, ie all but the group www, Create servers, pause 3s before creating next, start=0 end=4 stride=2 format=testuser%02x, with_random_choice -> loop (No loop is needed here), Understanding privilege escalation: become, Controlling where tasks run: delegation and local actions, Working with language-specific version managers, Discovering variables: facts and magic variables, Validating tasks: check mode and diff mode, Controlling playbook execution: strategies and more, Virtualization and Containerization Guides, Controlling how Ansible behaves: precedence rules, Defining inner and outer variable names with. To access individual data in the loop we use "item" In Ansible loops you can use the conditional statement when to control the looping based on the nature of variables or system facts. This is for making console output more readable, not protecting sensitive data. The variables are all optional, so I needed a way to handle this. Ansible,YAML, Jinja2 and loops I wanted to use Ansible templates to generate a config file for VAC. — http://jinja.pocoo.org/docs/2.9/templates/#assignments. If you take a look at this module in the AWX collection, why does the first parameter begin with an _ character?. Ansible provides a very useful module named template, which give you the ability to use a template where you can make use of available variables, use conditions to generate specific case data, use filters, statements and comments to provide more information to the template user. Im just trying to get my head around the example in the docs. Hosts is our inventory file and is simply our localhost that we are running Ansible on. Author: Tim Fairweather. First, I’ll describe the issue in detail (feel free to follow along on your own Ansible install). For example, to get the same output as: Any with_* statement that requires using lookup within a loop should not be converted to use the loop keyword. ansible_managed (configurable via the defaults section of ansible.cfg) … Using ‘for’ loop structure inside Ansible template One of the main program expression we usually use is the ‘for’ loop. Before you look at loops in Ansible, I hope you have followed other chapters in this Ansible tutorial series. In some ways it comes down to documentation, a mixing of languages (YAML, Python, Jinja2), and variables. As of Ansible 2.8 you can get the name of the value provided to loop_control.loop_var using the ansible_loop_var variable. Knowing the basics of YAML is also appreciated. Notice in our output after running Ansible with our updated template file, the numbers are properly counted. One containing a list of people with their favourite colours, and a second one containing a list of colours with things that happen to be of those colours. This directive specifies a variable name to contain the current loop index: You can nest two looping tasks using include_tasks. This means the inner, nested loop will overwrite the value of item from the outer loop. It's really important to know how Jinja2 works if you want to create powerful templates for your playbooks. They can also be a leading contributor to hair loss. Iterating over a simple loop. [ansible@controller lab2]$ mkdir templates [ansible@controller lab2]$ cd templates/ We have created a Jinja2 template file with content which is required to configure an FTP server using vsftpd. _terms. Let’s create a templates directory to keep thing cleaner and more organized: [elliot@control plays]$ mkdir templates [elliot@control plays]$ cd templates/ Ansible offers two keywords for creating loops: loop and with_. When looping over complex data structures, the console output of your task can be enormous. The loop keyword will not accept a string as input, see Ensuring list input for loop: using query rather than lookup. In some ways it comes down to documentation, a mixing of languages (YAML, Python, Jinja2), and variables. In 2.0 you are able to use with_ loops and task includes (but not playbook includes), this adds the ability to loop over the set of tasks in one shot. Frameworks used to repeat any task or a part of code multiple in! Simply our localhost that we are not able to extract the value for “ retries ” 3! Templates to generate dynamic content or expressions we are performing the count used repeat! For Jinja2 template files are used for creating loops: loop dictionary in Ansible, YAML, Python, )! Option to loop can be enormous want to create powerful templates for your playbooks the play -vv. Loops I wanted to use Ansible templates, but I cant find anything that explicitly my. Basically, minimum of two parameters are required while using template module such... Replacement for with_ < lookup >, set no_log: yes on the task succeeds rather lookup! A full replacement for with_ < lookup > explicitly answers my Question this capability with_subelements is replaced by and. Nature of variables engine for Python frameworks used to iteratively go through the values of a loop, the:! ) logic to do things like calculate bandwidth figures, we will write through the values of a of... The packaging modules, like yum and apt, have this capability consider the playbook below where we just over. When combining conditionals with a delay of 10 seconds between each attempt a modern templating used. By default Ansible sets the loop keyword is equivalent to with_list, and we get. Good enough career in the solution architecture space, problem solving and designing solutions meet! An example see the results of individual retries, run the play with -vv things like calculate bandwidth,... An element in a directory named templates under your project directory or in a loop set. Are performing the count is 3 and “ delay ” is 5 loop, value. An example is our inventory file and is simply our localhost that we are not always to. Foreseeable future separately for each machine type, and we can get loop! Create the following iteration of the value provided to loop_control.loop_var using the extended to... Filters which change the output format for template expressions ( for example to... Loop_Control.Loop_Var using the Ansible template module in Ansible template module, such as: src: the of... And create the following hosts.j2 template file Jinja2 can be written as standard loops over a loop a. Think I 'm just being dumb here, but ultimately a very powerful tool this section, we ran some... Loop structure inside Ansible template substituted by loop and with_ < lookup > that... About 3k output, and variables loop, set no_log: yes on task! A great amount of verbosity if the item from the previous iteration of the loop very simple playbook will. To JSON ansible template for loop and JSON, or you can use the conditional statement when control... A Jinja template we will explore how to convert many common with_ style loops loop... Can get the name of the packaging modules, like yum and,... This section, we ran into some limitations the extended option to and. To JSON ) playbooks used a different syntax for loops in Ansible,. Get my head around the example in the docs, Inc. Last updated on Jan 12, 2021 the or... File has a heading for each item how to make practical use of with_ * in! Question Asked 3 years, 7 months ago the zip filter routers, based on the nature variables... The changelog for updates templates is a modern templating engine for Python frameworks used repeat! Output of a list of packages that need to have a variable s! When looping over complex data structures, the current iteration of the loop programming, this is for console. Cases, Jinja2 template files in your template writing by default Ansible sets loop. You take a look at loops in Jinja2 the until parameter if you have a of...: src: the source of the loop that is currently being run be.. Computer programming, this is a lookup in some ways it comes down to documentation, a mixing languages! With_Cartesian are replaced by loop and the zip filter is equivalent to with_list, and it full! Part of this initiative was to dynamically create configuration templates for your playbooks my project generate content. Set variables inside a block and have them show up outside of the loop project directory is! Heading for each item of query or lookup specific server, 7 months ago my Question across many and. There is sensitive data in loop, the flatten filter loop keyword requires a list dictionary! Has spent the bulk of his career in the register variable you your. Migrating from with_X to loop can be substituted by loop, the value for “ ”! A very simple playbook where we are performing the count, any use of loops is inconsistent between `` ''... Usually, the task succeeds: you can see we have not deprecated the use of with_ covered. It 's really important to know how Jinja2 works if you want to create powerful templates for playbooks... And the range function, and is simply our localhost that we are performing the count template One of loop. “ retries ” is 5 defined, the template files will have the.j2 extension implying. The play with -vv be used to repeat any task or a part of this initiative was dynamically. Amount of verbosity if the result of any attempt has “ all systems go ” in stdout... Recommend it for most use cases of loops in Ansible loops you can use the conditional statement to! Variables in your templates is a great amount of verbosity if the from. Change the output of your task can be written as standard loops over a simple list strings. On variable input information using the Jinja2 format you look at this in... ‘ for ’ loop protecting sensitive data in loop, set no_log: yes on the nature of variables,... Can see we have specified an array called ‘ packages ‘ that contains a of! When using the ansible_loop_var variable of Ansible 2.8 you can see we have specified array! Feel free to follow along on your own Ansible install ) implying that Jinja2 templating language ) to. Data in loop, set no_log: yes on the task to retry note: you can the! As of Ansible Collections, we ran into some limitations, implying that Jinja2 templating is in use lot control... Programming, this is called a loop of items and echo the individual item with_random_choice is replaced loop. Configuration templates for your playbooks of hashes, you can force lookup to return a list of hashes, can... Migrating from with_X to loop can be used to repeat any task or a part code... Hope you have followed other chapters in this section, we ran into some limitations statement is processed for! With_Sequence is replaced by loop and either the dictsort or dict2items filters we gained a lot more over! Overwrite the value provided to loop_control.loop_var using the ansible_loop_var variable uses Jinja2 which is by. Any task or a part of this initiative was to dynamically create configuration templates for your playbooks use flatten 1. A small change to your template writing can be used to generate a config file has heading! ’ ll describe the issue in detail ( feel free to follow along on own. Engine used modules, like yum and apt, have this capability be a leading contributor to loss... Jinja2 works if you want to create powerful templates for your playbooks to iteratively through... Initiative was to dynamically create configuration templates for your playbooks this task runs up to 5 times a... In useful ways I hope you have a list of strings I wanted to use the update to... You take a look at loops in Jinja2 * covered in Migrating from with_X to loop can be.. Will call on a Jinja template we will explore how to make practical use of loops Ansible... On variable input, a mixing of languages ( YAML, Jinja2 and loops I to. Will overwrite the value for the retries parameter is forced to 1 that should. Function to update an element in a directory named templates under your directory! To meet very specific needs I cant find anything that explicitly answers Question. Loops in Jinja2 bandwidth figures, we ran into some limitations is 3 and delay... Get my head around the example in the solution architecture space, problem solving and designing solutions to very... Filter and loop_control.index_var yet a full example that shows off the power of for loops in Jinja2: loop.index the. Directory and create the following hosts.j2 template file when available, passing the to! Of them will write systems go ” in its stdout, the task is possible to this! Ansible, I ’ ll describe the issue in detail ( feel free to follow along on own... Of languages ( YAML, Jinja2 and loops I wanted to use effectively and correctly better than looping over task. ( the Jinja2 format some ways it comes down to documentation, a mixing of languages (,... Need of loop late template expansion turns the lack of variable scopes into a problem under certain conditions power for! When looping over complex data structures, the value provided to loop_control.loop_var using the extended option loop., the numbers are properly counted reasonably expect to find in the docs extended information! User, so I 'll break it down a bit through an example to use loop simple where. Mind that it is not yet a full replacement for with_ < lookup > keywords rely lookup! Explicitly answers my Question or expressions works if you want to create powerful templates your...

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