When you have multiple conditions that all need to be true (that is, a logical and), you can specify them as a list: If a fact or variable is a string, and you need to run a mathematical comparison on it, use a filter to ensure that Ansible reads the value as an integer: Often in a playbook you want to execute or skip a task based on the outcome of an earlier task. "msg": "do we get here" because yum, dnf or zypper is insufficient you can add 'warn: false' to this command task or set Add the same condition or conditions to all tasks in the role by placing your when statement on a static import_role in your playbook. So instead of using the if-else statement, you define what you want to happen. Next in our Ansible tutorial we will learn all about Ansible handlers and how to use handlers in Ansible playbook. Example (simple) when: ansible_os_family == "Debian" and ansible_pkg_mgr == "apt" Example (complex) When you use this approach, Ansible returns a ‘skipped’ message for every task on every host that does not match the criteria, creating repetitive output. if x is present in the list then only the second task will be executed or else it will be skipped The problem is that Ansible internally always faces an exception when a variable is not defined. You create the name of the registered variable using the register keyword. - hosts: all vars: test1: "Bye World" tasks: - name: Ansible when variable not equals example debug: msg: "Not Equals" when: test1 != "Hello World" Ansible … Then it looks for defined condition and if it's there, it handles the exception instead of failing. }, ok: [server2] => { ANSIBLE VERSION ansible 2.4.2.0 CONFIGURATION. Recently I had an interesting issue when using Ansible Blocks in a playbook which was skipping tasks within the block itself. cisco.ios-module documentation doesn't talk about vlans, only interfaces but for all intents they're similar. Here are sample conditionals based on the success or failure of a task. The message is nothing but any variable values or output of any task. The second task (Report if a file exists) uses the debug module to display a message. The Purpose. Let's start to put conditions on when to run a certain task with Ansible. Ansible runs fine, but does not make any changes to the switch. In the above example we did fail the playbook based on a condition match but there was no output on the console so operator may get confuse if the playbook has a BUG or the failure was intentional. Ansible when variable not equals another value. Last updated on Feb 09, 2021. group_by – Create Ansible groups based on facts, Configure SELinux to start mysql on any port, # all variables can be used directly in conditionals without double curly braces, (ansible_facts['distribution'] == "CentOS" and ansible_facts['distribution_major_version'] == "6") or, (ansible_facts['distribution'] == "Debian" and ansible_facts['distribution_major_version'] == "7"), ansible_facts['distribution'] == "CentOS", ansible_facts['distribution_major_version'] == "6", echo "only on Red Hat 6, derivatives, and later", ansible_facts['os_family'] == "RedHat" and ansible_facts['lsb']['major_release'] | int >= 6, Use the variable in conditional statement, Register a variable, ignore errors and continue, Run only if the task that registered the "result" variable fails, Run only if the task that registered the "result" variable succeeds, Run only if the task that registered the "result" variable is skipped, Run the command if "epic" or "monumental" is true, echo "I've got '{{ foo }}' and am not afraid to use it! when: (condition) Example. In the following examples I will show how to use debug module to print variable values, … I couldn't seem to figure out why the deeply nested variable structure was printing above just the value I wanted to see via the debug module.. Like your example, I'm still using with_items as that is what I've gotten used to.. If you have hosts with Red Hat operating systems (CentOS, for example), Ansible looks for ‘vars/RedHat.yml’. Recently I had an interesting issue when using Ansible Blocksin a playbookwhich was skipping tasks within the block itself. If the exists value is true, the module displays the message ‘The file or directory exists’. So if the condition is TRUE i.e. As per the debug module output, since httpd was already installed our TASK4 was skipped so no installation was performed. Whenever I use the "when" condition in conjunction with "with_sequence", 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. For example, the ‘lsb_major_release’ fact used in an example below only exists when the lsb_release package is installed on the target host. 1. You can also split the lines by other fields: The string content of a registered variable can be empty. - name: Conditional test debug: msg: "ansible_hostname not found in hostlist." One of the core features of Ansible is conditional task execution. In many cases the group_by module can be a more streamlined way to accomplish the same thing; see Operating System and Distribution Variance.. You would only want that task to run on machines that have SELinux enabled: Often you want to execute or skip a task based on facts. If we take our last example playbook which we used to install the httpd package. In Ansible, conditionals include when, loop, custom facts, register variables, and commonly used facts. 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. Create a conditional test based on the registered variable. The Debug Module. According to #47679, it appears that a custom loop … How to exit Ansible playbook without errors provided, 5 Answers. Login to Ansible server and view the ad-hoc inventory. However, how can i achive with the WHEN condition. In most cases, you can use the short module name debug even without specifying the collections: keyword. Conditionals are one of the fundamental parts of any programming languages so as to control the flow of execution. 'command_warnings=False' in ansible.cfg to get rid of this message. I had written 4 TASKS to achieve our agenda, although we could remove the debug task but there is another way to handle such use case. if the variable is not equal to another value. Use - … Note. To run them, just make a call to your own custom fact gathering module at the top of your list of tasks, and variables returned there will be accessible to future tasks: You can use conditionals with re-usable tasks files, playbooks, or roles. You will note a lot of ‘skipped’ output by default in Ansible when using this approach on systems that don’t match the criteria. In this conditional-operator.yml playbook I have defined a condition using "when" for the first task using debug module. Add a condition or conditions to individual tasks or blocks within the role itself. When: condition1 and/or condition2. It’s a handy tool to figure out any problem areas. the playbook should install the package only if the package is "not installed" already. You may use "-vvv" with the ansible-playbook command to get a verbose output which can you you more idea on the OUTPUT of our task. As part of the Block, I had a conditional whichevaluated whether or not something was true or false. If the variable is not a list, you can convert it into a list, with either stdout_lines or with variable.stdout.split(). You can also create conditionals based on variables defined in the playbooks or inventory. Ansible: Run Commands on Remote Linux. If you need to use command This provides us with the ability to control which tasks to run on a given host based on a condition/test that we specify. In this article, we will try to cover these. In the example above, we ran hostnamectl --static on node1 and node2.It doesn’t take long for one to realize that this method of running tasks on remote computers works fine for short commands but can quickly become burdensome or messy for more complex tasks that require further well-structured configuration parameters or interactions with … Ansible Inventory files maintain a list of the hosts which you want to configure or manage with Ansible. You can set up the 1_debug_example.yml playbook file:--- if x is present in the list then only the second task will be executed or else it will be skipped, So our first task was skipped as x is not equal to y while the second task has been executed because x was part of the list, We will use this playbook install-httpd.yml to install httpd package on server2 but with a condition i.e. It can contain Jinja2 filters, and it can also include logical operators and groupings. If the exists value is true, the module displays the message ‘The file or directory exists’. This article will show you how to work with Ansible playbooks, variables, inventory files, and some common Ansible modules with practical examples. Possible values (sample, not complete list): The major version of the operating system. Long Story Short, These modules give us a way to make ansible do something when a certain condition is met or satisfied. © Copyright 2019 Red Hat, Inc. The task is only executed if this Jinja2 expression evaluates to true. - hosts: all vars: test1: "Bye World" tasks: - name: Ansible when variable not equals example debug: msg: "Not Equals" when: test1 != "Hello World" Ansible when variable contains string when: result|failed. The when clause is a raw Jinja2 expression without double curly braces (see group_by – Create Ansible groups based on facts). Ansible Server – ansible-server; Remote hosts – uaans69, gpfslinapp1 . Facts are attributes of individual hosts, including IP address, operating system, the status of a filesystem, and many more. 1. Not all facts exist for all hosts. When you incorporate a role in your playbook statically with the roles keyword, Ansible adds the conditions you define to all the tasks in the role. If the conditions are not true it will skip the executions of that particular task. This approach is often much cleaner than putting a lot of conditionals into a single template to cover multiple OS or package versions. x == y then only the first task will be executed or else it will be skipped For example: Then import those variables files based on the facts you gather on the hosts in your playbook: Ansible gathers facts on the hosts in the webservers group, then interpolates the variable “ansible_facts[‘os_family’]” into a list of filenames. CentOS 7 server IP: 173.82.115.165 2. Using Ansible's conditionals. I have displayed variable and message in the debug same task. }, fatal: [server2]: FAILED! Getting ready Ansible failed_when and changed_when statements are similar to ansible when statement. My idea was to use the IP address to determine where the host is, but it was kind of struggling to create the condition. You can use the same approach when different OS flavors or versions require different configuration files or templates. For example, you can template out a configuration file that is very different between, say, CentOS and Debian: The following Ansible facts are frequently used in conditionals. Introduction to Ansible Register. Now in this playbook under shell task, we query the httpd package and check the stdout. Using Ansible "when" Statements - Build a Homelab on Setup Ansible with Python Virtualenv Weekly Links 10/29-11/4: VPN, Lab Apps, and Linux Basics - Build a Homelab on Using subelements in Ansible to loop through multiple lists. > Today we have about 90/100 Linux workstations, where most are of different flavors. There are three ways to apply conditions to roles: Add the same condition or conditions to all tasks in the role by placing your when statement under the roles keyword. The playbook that I had created was importing another playbook using a loop(Because Ansible does not support loops of tasks any other way that I know of)a defined number of times. Ansible executes these conditional statements differently for dynamic re-use (includes) and for static re-use (imports). If this is not the behavior you want, use an include_* statement to apply a condition only to that statement itself. In this recipe, we will outline how to configure conditional task execution. If the condition is not met, you'll see the task named end play if nothing to upgrade appropriately skipped, which would provide more info to the user as to why the play is, or is not, ending. @AngryNorseMan: ansible 2.7.0. Ansible conditionals help you to control the execution of a task or play based on the specific conditions. -name: Recursively find /tmp files win_find: paths: /tmp recurse: yes register: A.examined debug: msg = All files found when: register > 0 answered Jul 4, 2019 by Anvit comment Ansible is easy but powerful with lots of pre-defined modules. }, Working with managed nodes without python, Use Visual Code Studio to write playbooks (GUI), Ansible block and rescue (error recovery), Working with include and import module in Ansible, 5 useful tools to detect memory leaks with examples, 15 steps to setup Samba Active Directory DC CentOS 8, 100+ Linux commands cheat sheet & examples, List of 50+ tmux cheatsheet and shortcuts commands, RHEL/CentOS 8 Kickstart example | Kickstart Generator, 10 single line SFTP commands to transfer files in Unix/Linux, Tutorial: Beginners guide on linux memory management, 5 tools to create bootable usb from iso linux command line and gui, 30+ awk examples for beginners / awk command tutorial in Linux/Unix, Top 15 tools to monitor disk IO performance with examples, Overview on different disk types and disk interface types, 6 ssh authentication methods to secure connection (sshd_config), 27 nmcli command examples (cheatsheet), compare nm-settings with if-cfg file, How to zip a folder | 16 practical Linux zip command examples, How to check security updates list & perform linux patch management RHEL 6/7/8, Steps to expose services using Kubernetes Ingress, 7 easy methods to check disk type (HDD or SSD) in Linux, 4 practical examples - Python string replace in file, Kubernetes Tutorial for Beginners & Experienced, Beginners guide on Kubernetes RBAC with examples, 27 nmcli command examples to manage network, 15 csplit and split examples to split and join files, 16 zip command examples to manage archive. One of the core features of Ansible is conditional task execution. 2. We will continue to use our existing install-httpd.yml playbook file. Scenario is as follows. For example, you might want to configure a service after it is upgraded by an earlier task. Assume condition: if Interface FastEthernet0/0 is their then execute else do not execute. For example, if you are installing mysql on multiple machines, some of which have SELinux enabled, you might have a task to configure SELinux to allow mysql to run. 6 comments. when: ansible_os_family == "Debian" when: ansible_pkg_mgr == "apt" when: myvariablename is defined; Boolean Filter. Ansib… Login to Ansible server and view the ad-hoc inventory. This is the only approach that allows you to select or skip some tasks within the role based on your when statement. What is Ansible Conditional? when: ansible_distribution_version == "7.5" and ansible_kernel == "3.10.0-327.el7.x86_64" The when keyword also supports using a list to describe a list of conditions. In Ansible, ‘when’ statement is used instead to determine the outcome of a variable. OS / ENVIRONMENT. Successful - if the run has finished and there were no errors, the Ansible Operator will be marked as Successful. When you use this approach, Ansible applies the condition to the include itself plus any tasks in the role that also have that when statement. Ansible provides a debug module that makes this task easier. This Ansible playbook example helps you execute actions only if you are on a certain distribution. Since I am using rpm command, ansible is throwing the warning but since we are using rpm command just to get the package list, the warning can be ignored. On any host where the test passes (returns a value of True), Ansible runs that task. Windows and Linux update roles. We can also set the reverse, i.e. The purpose of this post is to give you a real-time example and explanation of how ansible variable is defined and not defined (undefined) conditionals are working along with “when” conditional statement and how it controls the flow of the task and the play. When a list is provided to the when keyword, all of the conditionals are combined using the and operation. conditional in ansible, ansible when, when statement, ansible tutorial, ansible playbook, ansible, jobs, ansible roles, ansible facts, ansible debug, ... How to Use Condition in Ansible. Ansible applies the condition to every task, and evaluates each task separately. (If you do not have one, just add the remote hosts in the file) [linadm@ansible-server automation]$ cat lin-servers.1 gpfslinapp1 uaans69 [linadm@ansible-server automation]$ 2. I am using the when conditional in ansible but it doens't seem to work. I'm on ansible 2.9.6 and attempting to create a L3 SVI on vlan 100. The configuration files for common services are also different on different OS flavors and versions. Ansible uses Jinja2 tests and filters in conditionals. Selecting variables, files, or templates based on facts, Selecting files and templates based on facts, ansible_facts[‘distribution_major_version’]. Here, we have a sample inventory file and a sample playbook as shown below. We can also set the reverse, i.e. Traditional programming language usually uses the if-else statement when more than one outcome is expected. x == y then only the first task will be executed or else it will be skipped Similarly in the second task I have added another condition i.e. Syntax. Only one playbook run should continue while others should wait. We will use our existing playbook from last exercise to first understand how when condition works: In this conditional-operator.yml playbook I have defined a condition using "when" for the first task using debug module. For more information on the differences between include v import see Re-using Ansible artifacts. 3. But debug lines are ugly and you want to remove them, or replace them with proper logging, before releasing your code. > Today we have about 90/100 Linux workstations, where most are of different flavors. Here, we have a sample inventory file and a sample playbook as shown below. To see what facts are available on your systems, add a debug task to your playbook: Here is a sample conditional based on a fact: If you have multiple conditions, you can group them with parentheses: You can use logical operators to combine conditions. TL;DR This when statement checks if the IP address is within the specified range. If no files in the list are found, Ansible raises an error. In this conditional-operator.yml playbook I have defined a condition using "when" for the first task using debug module. when: ansible_hostname not in hostlist.name I'm not sure of the syntax required in the condition, or if what I'm wanting is achieveable in this manner? Also, while working in a team where others also have the same stakes as you, using the debug module to add more information is always beneficial and can avoid confusion and dependencies. In the following steps i will show you ansible when condition examples with rc … "msg": "Is the httpd installed: package httpd is not installed" ... ansible-playbook task.yml --tags 'all, debug' 16. How to Execute a command based on the condition ? In this recipe, we will outline how to configure conditional task execution. If you observe the SUMMARY from the output of our last example: It shows changed=1 even when we know nothing was changed. debug. It checks the file_data register and uses the exists value as a condition for displaying a message. For our first example, let’s try a simple hello world playbook. [WARNING]: Consider using the yum, dnf or zypper module rather than running 'rpm'. Remember to ignore errors if you want Ansible to continue executing on a host when a failure occurs: Older versions of Ansible used success and fail, but succeeded and failed use the correct tense. Ansible conditionals help you to control the execution of a task or play based on the specific conditions. (If you do not have one, just add the remote hosts in the file) [linadm@ansible-server automation]$ cat lin-servers.1 gpfslinapp1 uaans69 [linadm@ansible … wait_for — > List of conditions to evaluate against the output of the command. It is possible some module thinks it changed the state of the target host which is when it reports the changed status but in this case since we know nothing is changed as part of this module we can suppress that output using "changed: false". So if the condition is TRUE i.e. ISSUE TYPE Feature Idea COMPONENT NAME with_subelements loop_control.loop_var when condition ANSIBLE VERSION $ ansible --version ansible 2.2.1.0 config file ... - name: Test with_subelements combined with a loop_var and when conditions loop_control: loop_var: debug_user vars: debug_users : - … If I run the playbook, ... sapp-lnx11 : ok=5 changed=0 unreachable=0 failed=0 How to Use When Conditionals Statement in Ansible Playbook, Connection failures set hosts as 'UNREACHABLE', which will Conditional statements in playbooks; Variables: All about variables; User Because of the different sudo conventions used by Ubuntu versus other platforms, here I am telling Ansible to set a variable named sudoGroup to sudo if the platform is Ubuntu, otherwise set it to wheel.

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