Ansible when string in list

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You can use the Ansible-specific filters documented here to manipulate your data, or use any of the standard filters shipped with Jinja2 - see the list of built-in filters in the official Jinja2 template documentation. You can also use Python methods to transform data. You can create custom Ansible filters as plugins , though we generally welcome new filters into the ansible-core repo so everyone can use them. Because templating happens on the Ansible control node, not on the target host, filters execute on the control node and transform data locally. Handling undefined variables. Providing default values.

Ansible when string in list

Image by Benjamin Hartwich on Pexels. When you're working with Ansible , it's inevitable that you'll deal with lists and dictionaries. In addition, Ansible uses lists and dictionaries to exchange data within processes and with third parties. This article covers analyzing and using the data in lists and dictionaries, which is crucial for anything you want to do with Ansible. Lists are the equivalent of an array , something used in many real programming languages which Ansible is not. Lists are indexed by numbers starting with zero. So if I want to use the first entry, bands , I use bands[0]. The second element is bands[1] and so forth. Later on, I will discuss methods to inspect, compare, and loop through lists. Dictionaries are the equivalent of hashes.

For Business. The basic filters are occasionally useful for debugging:.

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In a playbook, you may want to execute different tasks or have different goals, depending on the value of a fact data about the remote system , a variable, or the result of a previous task. You may want the value of some variables to depend on the value of other variables. Or you may want to create additional groups of hosts based on whether the hosts match other criteria. You can do all of these things with conditionals. Ansible uses Jinja2 tests and filters in conditionals. Ansible supports all the standard tests and filters and adds some unique ones as well. There are many options to control execution flow in Ansible. Basic conditionals with when. Conditions based on registered variables.

Ansible when string in list

Connect and share knowledge within a single location that is structured and easy to search. Now depending on output of the shell command, the number of elements of foo may vary. Just to expand on Vladimir Botka's response, you really need to check to make sure your item is a list or a dictionary first! It's very easy to make a mistake around type checking, as this can be a very easy slip-up to make. So, how can we confirm that this is, in fact, a list before we want to check the number of elements? We have to check if it's a string first as strings are also iterable, whereas dictionaries mapping and lists sequences are not strings. Stack Overflow for Teams — Start collaborating and sharing organizational knowledge. Create a free Team Why Teams? Learn more about Teams.

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However, you can make specific module variables optional. Hashing and encrypting strings and passwords. Did you find this helpful? Calculating numbers math. Stop by the Google group! Random items or numbers. GitHub Students Scholarship. For example, a registered variable might contain a dictionary when your next task needs a list, or a user prompt might return a string when your playbook needs a boolean value. You can also use the data type itself to cast a value as a specific data type. If you configure Ansible to ignore most undefined variables, you can mark some variables as requiring values with the mandatory filter. To make use of one attribute from each item in a list of complex variables, use the Jinja2 map filter :. How to work with lists and dictionaries in Ansible. Author: Anthony Critelli Sudoer.

You can use the Ansible-specific filters documented here to manipulate your data, or use any of the standard filters shipped with Jinja2 - see the list of built-in filters in the official Jinja2 template documentation. You can also use Python methods to transform data. You can create custom Ansible filters as plugins , though we generally welcome new filters into the ansible-core repo so everyone can use them.

The extract filter is used to map from a list of indices to a list of values from a container hash or array :. Posted: April 14, You might need to know, change, or set the data type on a variable. Skill Paths. Other hash types will simply ignore this parameter. Earn Referral Credits. Stop by the Google group! Generating a list of values to be passed to a command. Skip to bottom of list. Note The ansible. To select a single element or a data subset from a complex data structure in JSON format for example, Ansible facts , use the community. Search docs:. Transforming lists into dictionaries.