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. Making variables optional.

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. They differ from a list because they are keyed using a string, not a number. If I want to point to a specific entry, I can use the bracket notation rockers['drums'] to get the "John Bonham" string. In some places, you may find dot notation, like rockers. According to the Ansible documentation , "dot notation can cause problems because some keys collide with attributes and methods of Python dictionaries.

From my experience, the important things to consider when dealing with lists, dictionaries, and combinations in real-life scenarios are:. Note In the example above, quoting literals using backticks avoids escaping quotes and maintains readability. You must manually install the jmespath dependency on the Ansible control node before using this filter.

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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.

Ansible when string in list

One of the most powerful features of Ansible is its ability to work with lists. Lists can be used to store multiple values in a single variable, and they can be used in a variety of ways to perform tasks on those values. In this article, we will take a closer look at how to use strings in lists with Ansible. We will cover the basics of working with lists, and we will show you how to use lists to perform common tasks such as looping over a list of values, filtering a list of values, and sorting a list of values.

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Quick start guide to Ansible for Linux sysadmins. The second element is bands[1] and so forth. Without that filter before b64encode the wrong value will be encoded. The basic filters are occasionally useful for debugging:. Managing file names and path names. In addition, Ansible uses lists and dictionaries to exchange data within processes and with third parties. Here is an example of how to parse the output into a hash value using the same show vlan command. Prior to ansible 2. Beginning in version 2. By default, Ansible fails if a variable in your playbook or command is undefined. Log In Join for free.

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!

Learn the basics of using Redfish and how to set up the Redfish Mockup Server. Managing network interactions. The shuffle filter returns a list whenever possible. By default ansible. Later on, I will discuss methods to inspect, compare, and loop through lists. Managing file names and path names. Answers Trusted answers to developer questions. Blog For developers, By developers. Discovering the data type. Note You must manually install the jmespath dependency on the Ansible control node before using this filter. Stop by the Google group! For a full list of format codes for working with Python date format strings, see the python datetime documentation.