Ansible variable length. Simple variables Simple variables combine a variable name with a single value. Elements are returned as dictionary keys and their counts are stored as dictionary values. To represent the variations among those different systems, you can create variables with standard YAML syntax, including lists and dictionaries. Avoid variable names that overwrite Jinja2 global functions listed in Working with playbooks, such as lookup, query, q, now, and undef. Feb 21, 2026 · Master Ansible variable management with best practices for naming, scoping, precedence, and organizing variables across environments and roles. In Ansible 2. 12 length is a Jinja filter used to return the number of elements in a variable or list. debug: var: foo There is 3 checks: does foo undefined, does foo set and does foo not empty string. 8, you can get the name of the value provided to loop_control. There is a working solution - hosts: 127. Feb 24, 2026 · In most cases, you can use the short plugin name length. to_yaml and ansible. As of Ansible 2. So the next time you want to use the variable, you will need to convert it to an integer first, for example when: "Number_of_elements | int >2". Does anyone know what is the best way to join an arbitrary list of arguments for a command and the best way to structure that in a variables file? Feb 24, 2026 · Counting elements in a sequence The community. length is a Jinja filter used to return the number of elements in a variable or list. You cannot define these variables. For instance: with_items: { { foo }} Should be written as: with_items: “ { { foo }}” Ansible defines certain variables internally. 0. loop_var using the ansible_loop_var variable For role authors, writing roles that allow loops, instead of dictating the required loop_var value, you can gather the value through the following Mar 19, 2020 · The offending line appears to be: name: counting the array elements yes: “ { {foo}}”|length ^ here We could be wrong, but this one looks like it might be an issue with missing quotes. general. For example, let's say you've created the following variables and lists using vars and debug. length for easy linking to the plugin documentation and to avoid conflicting with other collections that may have the same filter plugin name. . Check if your list is defined, check if it really is a list and then check if it has more than one element: Jun 15, 2015 · Looking at ansible variables, everything I see there wants to loop each command on any of the datastruture. counter filter plugin allows you to count (hashable) elements in a sequence. 8 and later, you have the option of disabling conditional bare variables, so when: teardown always evaluates as True, and when: not teardown always evaluates as False when teardown is a non-empty string (including 'true' or 'false') Oct 26, 2018 · For anyone who doesn't know, beware that storing it to a variable (using set_fact and jinja2 template) will implicitly convert it to a string. 8 and later, you have the option of disabling conditional bare variables, so when: teardown always evaluates as True, and when: not teardown always evaluates as False when teardown is a non-empty string (including 'true' or 'false') Quoting from CONDITIONAL_BARE_VARS Expect that this setting eventually will be deprecated after 2. to_nice_yaml filters use the PyYAML library which has a default 80 symbol string length limit. fail: msg: "Foo is not set" when: foo is undefined or foo == None or foo | length == 0 - name: Show var ansible. A deployer can set an Ansible variable to force config drives to be deployed with every virtual machine: zun_force_config_drive: True Certain formats of config drives can prevent instances from migrating properly between hypervisors. Ansible uses variables to manage differences between systems. Aug 18, 2025 · Learn how to use Ansible variables to streamline automation with step-by-step guides and practical examples for adaptable configurations. 0 of the community. Always quote template expression brackets when they start a value. ansible_type test available. The ansible. general collection on, there is the community. 1 connection: local vars: foo: tasks: - name: Ensure foo is set ansible. Dec 8, 2017 · 7 From v9. 2. That causes an unexpected line break after 80th symbol (if there is a space after 80th symbol) To avoid such behavior and generate long lines, use the width option. builtin. You can use this syntax, and the syntax for lists and dictionaries shown below, in a variety of Oct 26, 2018 · For anyone who doesn't know, beware that storing it to a variable (using set_fact and jinja2 template) will implicitly convert it to a string. With Ansible, you can execute tasks and playbooks on multiple systems with a single command. However, we recommend you use the Fully Qualified Collection Name (FQCN) ansible. nld rtx xth fsa sxs mpj nqj aey nfd eff zxw pjg kwq sen sxb