Ansible startswith example gt: Greater than comparison. 10. Nov 24, 2021 · target. Not an easy task but I do need to find out. custom implementation / needs to be installed Using Python Standard Library string startswith Return True if string starts with the prefix, otherwise return False. The string somemachine-prod-p should become somemachine-prod only if the -p is at th Learn how to use Ansible's when clause to control the execution of your playbooks based on the value of a variable. You run Ansible commands such as ansible or ansible-inventory on a control node. 19/Ansible 12 release has made significant templating changes that might require you to update playbooks and roles. In this case, we'll use Ansible's select filter to extract items from a list that match a certain pattern. Oct 3, 2020 · Ansible has a ready-made mechanism to build the variables based on the inventory hosts and groups. 1 day ago · How to build your inventory Ansible automates tasks on managed nodes or “hosts” in your infrastructure by using a list or group of lists known as inventory. Some useful methods are as follows: endswith: Determines if the string ends with a substring startswith: Same as endswith, but from the start split: Splits the string on characters (default is space) into a Feb 18, 2025 · Learn how to use Ansible variables to streamline automation with step-by-step guides and practical examples for adaptable configurations. major_release fact. exclude_host_filters: location not in [‘eastus2’] “‘xyz’ not in name” “‘firewall’ in tags. https: as prefix and a port number e. In this comprehensive guide as an Ansible expert, I‘ll give you an insider look at inventory_hostname – from basic concepts to advanced usage patterns and troubleshooting. Quote: search succeeds if it finds the pattern anywhere within the string. ios. With optional end, stop comparing string at that position. e. You'll be an Ansible string in list expert in no time! Jul 23, 2025 · Consult ansible-doc for documentation and examples. For something simple like this it's not a big deal, but when you start having more custom groups based on tags and you don't want the ec2_tag_ prefix on every group (or are mixing EC2 and non-aws instances), it starts to become more of a pain. 13. This ensures selective task execution, improves playbook 3 days ago · This is the latest (stable) Ansible community documentation. Now in Ansible Automation Platform 2. With Ansible, you can execute tasks and playbooks on multiple systems with a single command. Jul 25, 2012 · Why is it that this variable assignment works: is_cent5: “‘$ansible_distribution’ == ‘CentOS’ and ‘$ansible_distribution_version’. Ansible can easily run and configure Unix-like systems as well as Windows systems to provide infrastructure as code. istartswith: Case-insensitive version of startswith. host from ansible_inventory, if it's exist then run a shell command on hosts which matches with all item. Ansible‘s with_items module provides a clean way to iterate over lists and perform the same task for each item. My playbook fails. Jinja2 filters are a key part of Ansible, helping you modify and manage data easily in your playbooks. Looking to go beyond basics with Jinja2? In this lab, you will learn how to use Jinja2 for documentation, not just configuration, a productivity tool for making your own templates more easily, and integrating Ansible into your pre/post checks in network configuration changes. If you ever start working with large, semi-heterogenous groups of VMs and want to manage them with Ansible, you quickly start running into problems trying to make it work with complex groups. Discover how to create custom Jinja2 filters in Ansible, a powerful tool for automating IT infrastructure. <module-arguments>: Parameters passed to the module, their format and meaning varying based on the specific module. Dec 10, 2018 · Hey all- I’m having more problems w/ the dig lookup. Ansible is popular for its Jan 17, 2025 · A practical guide to dynamic inventories in Ansible: using both dynamic inventory scripts and plugins! ansible. That webpage has examples. How to and where to use them in ansible playbook Feb 19, 2022 · I must match item. To use it in a playbook, specify: servicenow. Automate everything from code deployment to network configuration to clo Learn Ansible automation with comprehensive tutorials, practical examples, and expert resources from Luca Berton. Learn to extend Ansible's capabilities and streamline your workflows. Both jinja tests and filters run on on Ansible controller itself, not on the target host. [ Get started with IT automation with the Ansible Automation Platform beginner's guide. regex: Field matches the given regular expression. Aug 2, 2018 · Using dynamic groups in ansible When we have a condition which need to be checked for many tasks, it may be advisable to just exclude hosts (based on this condition) from been run at all. To install it, use: ansible\-galaxy collection install servicenow. 9. 4, we have introduced this as a fully supported feature and this blog aims to introduce you to it! Constructed inventory is the successor to the existing Smart Inventory feature, and is now presented Ansible is a radically simple IT automation platform that makes your applications and systems easier to deploy and maintain. com : ok=1 changed=0 unreachable=0 failed=1 skipped=0 rescued=0 ignored=0 However when the target's Python version was changed to use Python 2. 3 days ago · Getting started with Ansible Ansible automates the management of remote systems and controls their desired state. For example: --- - name: Check variable starts with substring hosts: all tasks: - name: Verify variable Nov 3, 2022 · One of the most popular platform integrations available to Ansible Automation Platform subscribers in Ansible automation hub is the Red Hat Ansible Certified Content Collection for ServiceNow ITSM. Nov 24, 2021 · blockinfile errors with Python3: TypeError: startswith first arg must be bytes or a tuple of bytes, not str #76358 3 days ago · This is the latest (stable) Ansible community documentation. constructed – Uses Jinja2 to construct vars and groups based on existing inventory. api. How to select attributes from Ansible dictorinary. startswith (‘5 Dec 16, 2014 · ansible sample inventories. Aug 18, 2025 · Ansible Conditional Statements allow the user to manage the execution of tasks based on specific conditions. Its ability to filter lists of dictionaries based on specific attributes makes it an invaluable tool when working with complex network Feb 24, 2024 · Ansible Selectattr example. type_debug, ansible. itsm 2. For Red Hat Ansible Automation Platform subscriptions, see Life Cycle for version details. If I statically define a list of hosts to lookup as a variable, it works. Jun 21, 2019 · use select and map with ansible Ask Question Asked 6 years, 4 months ago Modified 1 year ago Mar 19, 2024 · Thanks for the update. Nov 21, 2023 · I'm trying to loop a list and using a when, but if the when has : the Lint fails. dict2items, and ansible. startswith ('ata-') and not ids. This comprehensive guide walks you through troubleshooting tips, from basic fixes to advanced solutions, including key examples and best practices. Difference between ansible_hostname and inventory_hostname. Thus, having a remote record of what machines make up a Oct 28, 2021 · Sample of playbook: use loop, i suppose containers is a list of name of containers, if its dict you adapt item. Here’s a simple example: ` … Dec 27, 2023 · If you manage infrastructure with Ansible, fully utilizing Ansible‘s inventory_hostname variable unlocks entirely new possibilities for your playbooks and automation workflows. With optional start, test string beginning at that position. yml is a dynamic file which is changing on daily basis, all hosts exist in inventory but I only want to leverage those which is in file. Aug 9, 2019 · On my side (ansible 2. For the regex you could do this {% for dev, ids in ansible_device_links. I want to check if the value is in {{ variable1 }} but I get an error: - name: do something when the value in variable1 command: <comm Dec 27, 2023 · Have you ever needed to perform the same task over and over again in an Ansible playbook? Installing packages, creating users, deploying config files – these repetitive tasks are ideal for looping. Ansible will accept any kind of executable file as an inventory file, so you can build your own dynamic inventory however you Dec 27, 2023 · What are Jinja Filters in Ansible? Ansible utilizes Jinja2 templating under the hood to enable robust configuration management workflows. The groups variable is also unavailable, it gets created at Ansible runtime. - name: move agent android hosts: server1; server2 vars: containers: "{{ containers }}" #variable in a different file tasks: - name: move agent Android command: curl "api request to a server" when: item. Dec 6, 2023 · An Ansible playbook is a YAML file that contains a set of instructions and configurations for automating tasks on one or more remote machines using the Ansible automation tool. Aug 9, 2019 · The regex in OPs example match correctly for me and are doing the job (ansible 2. itsm. New to Ansible and the ServiceNow ITSM. Meanwhile, I totally agree version comparison is the good practice solution in this case. As shown in the preceding figure, most Ansible environments have three main components: Control node A system on which Ansible is installed. Over 200 built-in filters come packaged with Ansible to transform and customize data. It's a pretty simple python script that's easy to modify. Inventory A list of managed nodes that are logically The Ansible Collection for ServiceNow IT Service Management (ITSM) provides Ansible content that enables users to automate the management of ServiceNow ITSM processes such as incidents, change requests, service catalogs, configuration items, and more. This module is part of the servicenow. It may not be possible, I don’t know, but the end customer wants to keep the coding within Ansible as much as possible & not be reliant on addition packages. However, we recommend you use the FQCN for easy linking to the plugin documentation and to avoid conflicting with other collections that may have the same inventory plugin name. For collections that support Ansible 2. builtin. Jan 30, 2019 · I have a dictionary, I want to do a nested jmespath. This collection is ideal for IT administrators Jun 20, 2024 · What is Ansible? Ansible is an open source automation and orchestration tool for software provisioning, configuration management, and software deployment. 5000 as suffix in order to configure a file or use the list to query the endpoint. In most cases, you can use the short plugin name constructed even without specifying the collections: keyword. At this point, consider splitting the inventory into several smaller ones. The question is simple. Its syntax is as follows: <list of dictionaries> | selectattr('<attribute>', '<operator>', '<value>') Key Description list_of_dictionaries A list of dictionaries representing items to […] Note This inventory plugin is part of ansible-core and included in all Ansible installations. If you need to execute a task with Ansible more than once, you can write a playbook and put the playbook under source control. In this post in our Ansible beginner's series, I will explain how to use an Ansible Playbook by example. 1). Oct 7, 2020 · hi, again a very simple use case in appearance but that is driving me nuts to realize with ansible, anyone ever done : tasks: name: run a module any_module: users: {{item}} # I want to loop first here state: absent name: “prefixed-*” # basically anything that starts with ‘prefixed’ I tried : as above just using the wildcard symbol , doesn’t work Things that comes to mind : use 3 days ago · Working with dynamic inventory Inventory script example: Cobbler Other inventory scripts Using inventory directories and multiple inventory sources Static groups of dynamic groups If your Ansible inventory fluctuates over time, with hosts spinning up and shutting down in response to business demands, the static inventory solutions described in How to build your inventory will not serve your Jan 3, 2025 · The all and ungrouped don’t get auto generated until ALL inventory sources are parsed, they would only exist for the constructed file if they had been defined in the static one. Apr 18, 2023 · Ansible offers a wide variety of filters to help users manipulate and manage data, making tasks easier and more efficient. My inventory is as seen below: [group1] hello1 world1 hello2 world2 [group2] hello3 And my t Apr 20, 2025 · If you’re learning Ansible and want to go beyond static config files, this post walks through how to use Jinja2 templates and filters to make your automation more flexible and scalable. Dec 27, 2023 · Hey there! If you‘re an Ansible developer, you‘ve likely run into the need to filter and transform data to target specific system configurations and requirements. To be more specific, I'm pulling all MAC addresses on each node into a list and looking for a specific manufacturer prefix in each interface. For example, once the cluster has been running for a few months, you might want to do a Yum update. In this post, I cover: • What Jinja2 templates are and why they matter in real-world Ansible playbooks • How to create dynamic configuration files using variables, loops, and conditionals • Real May 2, 2024 · Example of a list of IP addresses which need to be have a protocol e. For example, converting Sep 9, 2019 · Is selectattr filter expecting all the dicts in the list to have the same keys?Because it does not make any sense not to be able to filter a list of custom dicts with Jinja2. Once we made that Jun 11, 2015 · The following is an excerpt from Chapter 7 of Ansible for DevOps, a book on Ansible by Jeff Geerling. 3 days ago · YAML Syntax This page provides a basic overview of correct YAML syntax, which is how Ansible playbooks (our configuration management language) are expressed. Learn how to resolve the dict object has no attribute error in Ansible. Nov 11, 2025 · Ansible Network Examples This document describes some examples of using Ansible to manage your network infrastructure. An example may be the execution of a task based on a variable’s boolean value: vars:epic:true This repository contains examples and best practices for building Ansible Playbooks. 1 day ago · This is the latest (stable) Ansible community documentation. Dec 2, 2020 · I am trying to extract the data from a JSON output obtained from API call using uri module. Feb 5, 2015 · This Stack Overflow thread discusses methods similar to 'startswith' in Jinja2/Flask, offering solutions and insights for developers working with these frameworks. iteritems () if ids. That would help both to simplify their management and improve safety (i. Eventually, you want to de-provision. inventory_hostname is one of Ansible's "magic" variables: Additionally, inventory_hostname is the name of the hostname as configured in Ansible’s inventory host file. In this comprehensive guide, […] Jul 5, 2019 · I have a simple playbook and return available update package name as below. So something like this 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. 2). 9, please ensure you update your network_os to use the fully qualified collection name (for example, cisco. We will start with a basic Ansible playbook and learn what is task and play and what is playbook etc. Apr 8, 2016 · I have multiple tasks depend from the value of variable1. 3 days ago · Extending Ansible Developer Guide Adding modules and plugins locally Should you develop a module? Developing modules Contributing your module to an existing Ansible collection Conventions, tips, and pitfalls Ansible and Python 3 Debugging modules Module format and documentation Ansible markup Adjacent YAML documentation files Windows module development walkthrough Creating a new collection Using variables Ansible uses variables to manage differences between systems. It is not included in ansible-core. product” Other question, Is possible create inventory children in Oct 9, 2025 · selectattr in Ansible selectattr is a filter plugin in Ansible that allows you to select a subset of elements from a list of dictionaries based on the value of a particular attribute. Dec 31, 2023 · Let's start with a basic example of filtering a list based on specific element values in Ansible. endswith: Field ends with value. The primary mechanism by which conditional logic is added to tasks in Ansible is by using the when keyword. > d = {'foo1 Sep 18, 2021 · In jinja filters are used to modify/manipulate variables. Feb 24, 2024 · In this post, we are going to see examples of Ansible playbook and various different modules and playbook examples with various modules and multiple hosts. iregex: Case-insensitive version of regex. Oct 27, 2021 · Explore related questions ansible ansible-playbook wildcard conditional See similar questions with these tags. Jinja allows you to take variables and facts, run them through parameterized filters, and output modified YAML, JSON, or text configurations. While there are numerous filters available, I find myself frequently using the selectattr filter in the context of Network Automation. May 5, 2021 · I'm trying to iterate over a list in Ansible and search for a string in each item in it, and then assigning the matched item to a variable. It contains its own declarative programming language for system configuration and management. example. I need to filter the VMs starts with xyz but not has tags firewall and not working. I would like to filter the output start with specific letter example to get package name start with 'n' letter. Use the ansible. ios). 7 instead of 3. So I suspect the problem is somewhere else. Feb 6, 2020 · I am trying to match hosts using a regex pattern with ansible but it is not working as expected. We use YAML because it is easier for humans to read and write than other common data formats like XML or JSON. Learn Ansible automation with comprehensive tutorials, practical examples, and expert resources from Luca Berton. startswith: Field starts with value. To represent the variations among those different systems, you can create variables with standard YAML syntax, including lists and dictionaries. Variables defined in the playbooks or inventory can also be used. Apr 1, 2021 · Ansible: Create sublist from list using "startswith" comparison Asked 4 years, 7 months ago Modified 3 years ago Viewed 1k times Mar 29, 2019 · I have the following conditional in an Ansible task: when: ec2_tag_Name == 'testhost01' It works fine, however I would like to match a wildcard on the ec2_tag_Name field. For example, group them by teams. Note This module is part of ansible-base and included in all Ansible installations. See how to use AND, OR, and NOT operators for multiple conditions. Well, you‘re in luck – Ansible provides two powerful Jinja2 filters just for this purpose: selectattr and rejectattr. Also ‘composed’ varaibles are not available until the end of the plugin run, so you cannot define and use in another source. you need to iterate over the items of ansible_all_ipv4_addresses Learn how to use Ansible to loop through a list of strings with this easy-to-follow guide. You may also wish to read Working Apr 30, 2025 · **Hi. Jul 24, 2020 · Hi guys, I use dynamic inventory azure_rm and I have a problem with exluce_host_filters. 8. To check whether it is installed, run ansible-galaxy collection list. itsm collection (version 2. With this powerful feature, you can automate tasks that would otherwise be difficult or impossible to perform. iregex: Case-insensitive version of regular expression. hosts then exit. While one of these sources can be the list of host names you pass at the command line, most Ansible users create inventory files. Filter and Select items from Ansible dictionary using selectattr example. Dec 31, 2023 · In this blog post, we're going to explore how to use Jinja2 filters in Ansible. But if I return the list of hosts from another script, it fails. g. I have those three, but when I try to insert them inside the playbooks servicenow. The format is like below item : "name-of-the-item" &quo May 29, 2015 · Below should do the trick: - name: Install PHP Modules command: <command> with_dict: php_modules when: "'batch' in inventory_hostname" Note you'll have a couple of skipped hosts during playbook run. Automate tasks efficiently with multiple conditions, variables, and logic for better control. example Mar 9, 2025 · New to Ansible? Learn how to write and run playbooks with 7 beginner-friendly examples, including loops, variables, and OS-specific installs. Mar 17, 2020 · Q: "Remove all the lines containing . In this comprehensive 2500+ word guide, we‘ll dig deep into how these […] String methods String methods can be used to return new strings or a list of strings that have been modified in some way or to test the string for various conditions and return a Boolean. 0 Dec 10, 2015 · ansible vca_vapp AttributeError: 'NoneType' object has no attribute 'startswith' Ask Question Asked 9 years, 5 months ago Modified 9 years, 5 months ago. iendswith: Case-insensitive version of endswith. It is supposed to use this Help Desk + Automation collection. Jun 29, 2023 · The New Constructed Inventory Feature In this blog we introduced the idea for a new smarter way of handling inventory based on the Ansible constructed plugin. items2dict filters to manage data types. filelist. Feb 9, 2016 · I'm trying to filter a list in ansible in Jinja2 when the elements contain a string, but the Jinja documentation doesn't seem clear enough for me to figure it out. But they do not have any information about my trial ServiceNow instance (usually a Help Desk hostname, a username and a password). For example converting strings from lowercase to uppercase or selecting items from a list. log”’ rules: var Jan 21, 2023 · Ansible inventory_hostname and ansible_hostname example. The data contains some key value pairs. name or other. Feb 9, 2010 · Releases and maintenance Ansible version compatibility This collection has been tested against following Ansible versions: >=2. Your inventory defines the What is Ansible? How does it work? See the Ansible tutorial for beginners with playbook and commands explained with examples. prefix can also be a tuple of prefixes to look for. I want to not just explain what this […] Feb 7, 2017 · Hello, Actually I wrote my playbook this way to set values id the dual variable is the string value SRV: set_fact: distrib: “{{ distribsrv }}” Directoryname: “{{ Directorysrv }}” when: dual == ‘SRV’ I would like to modify the when condition to run it when dual == ‘SRV1’, "SRV2’ … etc, is there a way to do a when condition : when : dual like ‘SRV*’ ? Automation for the People! A Subreddit dedicated to fostering communication in the Ansible Community, includes Ansible, AWX, Ansible Tower, Ansible Galaxy, ansible-lint, Molecule, etc. Further, there are libraries available in most programming languages for working with YAML. ansible_backup_ " A: You can either use the simple test search. itsm Mar 25, 2025 · Learn how to use the when condition in Ansible playbooks. Important: The ansible-core 2. These allow tasks to run only when specific criteria are met such as variable values, file presence, or system facts. New in servicenow. Nov 1, 2022 · This article covers analyzing and using the data in lists and dictionaries, which is crucial for anything you want to do with Ansible. Any thoug Learn what Ansible conditionals are with examples for when and register. Nov 11, 2025 · Ansible playbooks Ansible Playbooks provide a repeatable, reusable, simple configuration management and multimachine deployment system that is well suited to deploying complex applications. gte: Greater than or equal to comparison. In most cases, you can use the short module name constructed even without specifying the collections: keyword. you won't be able to affect the servers you didn't meant to change). Most infrastructure can be managed with a custom inventory file or an off-the-shelf cloud inventory script, but there are many situations where more control is needed. ids. search on the keys of the dictionary for keys that start with a specific string, but I can only seem to use the @ operator once. 8 (by setting the ansible_python_interpreter in the Ansible inventory), the task was successfully executed: ck@ansible:~$ grep target inventory/* While there are lots of tools in Ansible for generating an inventory file dynamically, in a system like this, you might want to be able to perform additional operations against the same cluster. 0. Prerequisites Groups and variables in an inventory file Ansible vault for password encryption Common inventory variables Privilege escalation Jump hosts Example 1: collecting facts and creating backup files with a playbook Step 1: Creating the inventory Step 2: Creating the Sep 9, 2020 · Trying to keep it within the Ansible sphere & use Ansible/Jinja2 filters or regex as much as possible. 1) I cannot reproduce your problem and your regex match correctly. 0 | regex Mar 20, 2019 · Hi all… I have the below vars: ` client_destinations: apache-servers: pre_cmd: ‘$template custom,“/logs/apache-servers/%source%. For example if i had a more complicated yaml (not that flat) am i limited to search and filter within Ansible? For example if i have a yaml looks like this: Apr 29, 2018 · Hi Kai, >- Is there any way to do a regexp match? I am concerned that without > anchoring the "ata-" at the start or including the digits of the > "-partX" bits that these strings could one day occur elsewhere in > the id and erroneously exclude devices. Ansible allows to load multiple inventories at a time. If you organize your inventory, you can avoid a lot of complication in trying to match host patterns. startswith if you use the uniq string works fine, i guess it's because ansible_all_ipv4_addresses is a list. the above example requires the lsb_release package on the target host in order to return the ansible_lsb. This can be useful for when When deploying with ansible, There's 1 specific case where I need to strip a string of a trailing -p substring. And why use a custom variable when you can get this automatically in your facts with ansible_python_version ? It would be much better to use version comparison (as proposed by @Vladimir Botka below). Some vms starts with xyz… and has tags. Ansible composes its inventory from one or more ‘inventory sources’. nfhxtrd jnbmuk yqptjrr zfa ygiec jedw eez hybm uxiss btafhty dpdvhph ttfkk pemtw ajutos mae