Ansible register dynamic variable name In this article, we will explore the I have a variable defined with register. Then use the ip_configurations array somewhere else after it's been modified. Ask Question Asked 5 years, 10 months ago. ) Use the lookup plugin to retrieve the value of whatever dynamic interpolates/resolves too. How can I modify the register variable? For Example, azure_network_interface_info. Evaluate dynamic variable name in ansible. (correct me if i'm wrong) I've read that it's not possible to reset facts inside an ansible-play. Dictionaries are commonly used to represent configuration data, variables, and other structured information in Ansible playbooks. This ensures Ansible can dynamically locate and use the appropriate inventory files, reducing complexity in deployment processes. So it’s a cosmetic thing, but done for a very good Ansible Register Variables. im stuck with the below I need to get input from user and based on input dynamically create a url . 3: 2: Use variables in files. Like dynamic inventory, they be executable scripts (and therefore, query redis or whatever In one Ansible playbook I include a variables file which contains one variable like this: dictionaries: - host1: - key1: - name: "Foo" params: - bar: "Baz Ansible get a dictionary item with a dynamically compiled key name. I have an Ansible task where I navigate to a YAML variable file in GitHub, download the file, and add the variables as Ansible Facts where they're later used. Each individual task within your include file can register variables, and you can reference those variables elsewhere, so there's really no need to even do something like this. ip_configurations has public_ip_allocation_method which I'd like to change it to Static Or Dynamic. Ansible allows for the creation of dynamic variables using the register keyword: - name: Get date command: date register: current_date - name: Display date debug: msg: "Current date is {{ current_date Use lookup/dynamic variable names in Ansible jinja2 template. attr1 }}" How do I get variable name from variable. In most cases, you can use the short plugin name vars. stdout Loops . ; On the other hand, if it has a global value (global in a sense of host invariance), there is no confusion which value to use. See ansible special variables). server”: {“not_after”: “2019-11-27T21:36:56UTC”, I am trying to define a variable in defaults. However, we recommend you use the Fully Qualified Collection Name (FQCN) ansible. However I really want to build the variable name dynamically and use the value of the "customer" variable (in the case abc) as part of variable name abc_secret_key. ansible_check_mode Boolean that indicates if we are in check mode or not. You have two choices: write out those variables to a file, then use include_vars: to read them in -- which will assign them as host facts, or concede to the way set_fact: wants things and be content with those dynamic variables living underneath a known Summary. - The variable we are interested in in this example is foo. I’m already working on my RHCE EX294 exam, and don’t worry its not going to be the last one Have fun reading. ansible_collection_name The name of the collection the task that is executing is a part of. Variable names should be letters, numbers, and underscores. 7: 4: September 27, 2015 Use results from facts. You can define variables in separate YAML files and include them in the playbook using the vars_files directive. foo_port is a In Ansible, a dictionary (also known as a hash, map, or associative array) is a data type that allows you to store and manipulate key-value pairs. below is one of my failed attempts . One of the problems is each role sets a specifically named fact basically like: ec2_<appname>_foo What i want to do is this: ` set_fact: “{{ some var }}” : “{{ some value }}” ` The problem is that i can’t seem to figure How do you get the current host's IP address in a role? I know you can get the list of groups the host is a member of and the hostname of the host but I am unable to find a solution to getting the IP address. There is another feature in ansible we can use to work around the fact that handlers does not support arguments. Conrete creating a directory with the current timestamp at the end of the name. Static variables Here the output is in dictionary format and we need to access the Keys of this dictionary. ipv4. Best Practices for Using Variables. Before you start using variables, it’s important to know what are valid variable names. Have a task that includes another task and passes in the var "output" to be used as the dynamic register var name. I already have groups based on distribution, prod, dev, test, qa ,dr in my host inventory. The registered variables can then be used within conditional statements, in which decisions are taken based on the output of 0down votefavorite | How to create variable group based on ip address-range in ansible inventory groups ? I have two groups of servers in different location. debug: msg: "{{ echo_output. So you can say: **- name: Snarf the playbook start time on all Ansible variables are dynamic values used within Ansible playbooks and roles to enable customization, flexibility, and reusability of configurations. 1. Once the register module captures the task's output, it can be referenced in various contexts, such as conditional statements or printing the Python keywords or playbook keywords are not valid variable names. A variable name cannot begin with a number. Ansible set_fact is quite powerful when you need to define variables dynamically at runtime. Learn how to use Ansible variables to streamline automation with step-by-step guides and practical examples for adaptable configurations. yml --- - hosts: localhost vars_files: - "{{ name }} . Once the register module captures the task's output, it can be referenced in various contexts, such as conditional statements or printing the Explanation of the below example (not tested as is but on similar data structure). 1: 0: But this registers the result of the first task and conditionally loops over that in the second task. This is not true in Ansible. Conditionals are always run through Jinja2 as to resolve the expression, so when: , failed_when: and changed_when: are always templated and you should avoid adding {{ }} . End-to-end automation: env0 automates the entire deployment lifecycle. Use the register keyword and the name of the variable you wish to save the result in to capture the output of a job. Viewed 11k times 2 . Creating valid variable names ¶ Before you start using variables, it’s important to know what are valid variable names. By default, you can also access some Ansible facts as top-level variables with the Special Variables Magic variables These variables cannot be set directly by the user; Ansible will always override them to reflect internal state. A registered variable always contains the status of the task that created it as well as any output that the task generated. Let's take this list of users as example data: users: - name: John Smith login: jsmith birth: 1960-01-01 - name: Jane Smith login: Here we use the trick with a combination of with_ loop and register variable: set_fact task has ansible_facts dictionary in its result In Ansible I've used register to save the results of a task in the variable people. This is Is it not possible to dynamically name the register the output of a command which can then be called later on in the play? I would like each iteration of the command and its subsequent register name to be accessed uniquely, e. There is an undocumented * but intentional interaction between ansible. ; Without register, the Dynamic variable handling: Managing environment variables, such as ANSIBLE_CLI_inventory, is made easy with env0. yml PLAY Use variables in files. For example the below file: A better representation of the main. So we first take the variable name ansible_eth0 followed by the key so using dot notation the variable becomes ansible_eth0. - We're going to create a variable called dynamic, which will have the name of the variable we are going to lookup dynamically. Here's a simple example of checking disk One powerful feature of Ansible is the set_fact module, which enables you to create or modify variables dynamically during playbook execution. I want to create the two groups based on their IP range (two ranges for two locations) . According Registering variables" When you register a variable in a task with a loop, the registered variable contains a value for each item in the loop. input group1 is a single value and group2 is a list using with_items and loop im able to create variable but couldnt register it and pass it to get_url module . - vars: my_var: attr1: Hello world attr2: yes debug: msg: "This is variable name > my_var. Ask Question Asked 4 years, 10 months ago. ; You can transform a dict into a list of key/value pairs with the dict2items filter. yml -e "name=myvars" However this results in this error: ERROR! vars file How do I register a variable and persist it between plays targeted on different nodes? 3. Could someone help me out with this: Lets say I ran a task in playbook that registers the route of the Openshift deployment. yml ansible-playbook test. Variable names must also start with either an alphabetic or underscore _ character. foo5 is fine too. A simple solution seems to be to pass the log filename dynamically to the ANSIBLE_LOG_PATH environment variable. community_release_num}}, but when I run playbook: ansible-playbook vartest. builtin collection. 1. That’s a json output from an API. Ansible can’t tell the variable has only one value, since the variable is “inventory scope” as such, it can’t plug it in, because the task header (that preceeds the next 500 task results) would not apply equally to all hosts. How to Implement Ansible Register? Step 1: Register Variables. Hot Network Questions Understanding the Saddle Point Intuition in GANs Why has Paramount not released Star Trek: Starfleet Academy? How to combine integrands or sumands? What makes a 5 Hi , Im a newbie learnig ansible . A dictionary in Ansible is enclosed in curly braces {} and consists of Basically think of it as each variable (for a large infrastructure) basically having 500 different values. I have a list of tenants like this: tenants Later in the playbook I use the terraform module to apply my configuration and register the outputs to a variable: - name: Run terraform terraform: project_path: "{{ enviro The following is a simple playbook which tries to dynamically load variables: site. Yup, that's a possible way to do it, register multiple handlers with different names dynamically. stdout }} If you have an include file with an arbitrary number of tasks within it then Ansible would have no way of knowing what to store in the variable in your example. d on the client machines. Variables in Ansible are global so there is no reason to pass a variable to handler. Is there a good way to register a variable in ansible, based on another variable, rather than depending on shell script? The most elegant way would be to use dynamic inventory, rather than static inventory and dynamic group variables. Each time the playbook runs, 1 group name is captured and added to a cached list. each loop just keeps appending the account_secrets variable, which causes the last account have all the secrets from the previous iterations. Ansible Dynamic Variables in Playbook. yaml tasks: - name: Task using variable from file debug: msg: "The value of variable is {{ var }}" In Ansible I have two separate tasks to get the list of existing services for redhat 6 and 7, they register to a variable, then I have another task that stops those services, I tried dynamic var names or creating a dictionary, but none work. You are in luck, because it solves exactly this problem in a clean way. yml -e "param1=value1 param2=value2 param3=value3" If only param1 passed When I try to create variable dynamically through template then my playbook always takes previous variable Dynamic variable names with ansible. My YAML file looks like: --- foo: bar So far, the best solution I've found is to run a shell script as shown below. For example, a variable with the name test_var can be set using {{ 'test_' }}var. Use Meaningful Names: Avoid ambiguous variable names to ensure clarity. Typically, this involves executing a task on a remote host using modules like shell or command. Dynamic Variables: Ansible facts act as dynamic variables that can be used to customize playbook behavior based on the real-time conditions of the target systems. yaml file and add the following content. Hi, I’m trying to accomplish something like this. How can I consolidate a task like this one into a parametrized form while registering separate variables, one per item, for later use? So the goal is to have variables based on the group name which can then be used in later tasks. Ansible: How to build variable name using other variables values. Tasks can register variables that store the results of their execution. You can access this data in the ansible_facts variable. foo-port, foo port, foo. Omitting the stuff I don't need, it has this structure: { "results": [ { "item": { Creating valid variable names ¶. How can I assign a variable to the sequence end that Name-of-Team_B applications: - name: app_name_c - name: app_name_d Execution: ansible-playbook run. STEPS TO REPRODUCE. Accessing Facts: Facts are stored in the ansible_facts dictionary and can be accessed in playbooks using the syntax ansible_facts[‘fact_name’] or simply ansible_facts. Ansible register variable Jump to solution. The data structure placed in the variable during the loop will contain a results attribute, that is a list of all responses from the module. abc_secret_key }}. - name: Get facts for one Generally, variables defined closer to the task execution take precedence over more globally defined variables. In many programming languages, variables that begin with an underscore are private. 3. You can use registered variables in templates and action lines as well as in conditional when statements. Modified 2 years, 9 months ago. Appreciate help in listing the variable of variable value in task as given below when the second variable is and indexed list. It is part of the ansible. port and 12 are not valid variable names. You just have to write a jinja2 template file for the same. Ansible facts Ansible facts are data related to your remote systems, including operating systems, IP addresses, attached filesystems, and more. set_fact for easy linking to the module documentation and to avoid conflicting In my template, I want to reference the secret key based on the value of customer variable. I am trying to shrink ~30+ roles into a single role to drastically reduce the amount of duplicate and copy and pasted code into a single nice and neat role. They are very similar to variables in programming languages, helping you manage complex Information about Ansible: magic variables. And this is data inside `attr1` > {{ my_var. foo_port is a great variable. . The ansible-examples github repository contains many examples of how variables are used in Ansible. uri:. yml with some kind of dynamic. This is similar to the issue #15700 but the cause appears to be different. This is working when only creating one at a time, but I would like scale this playbook to create more than one at a time. yml file would be --- asm_disk_detail: - name: OCR path: "/dev/sde1" - name: DATA path: "/dev/sdf1" - name: ARCH path: "/dev/sdg1" You can do it with set_fact, with_items and register. Let’s call it just json output. How to loop over Ansible variable names. Like this. " You create the name of the registered variable using the register keyword. Ansible variables are dynamic components that allow for reusability in playbooks and It’s crucial to note that these variable names are reserved by Ansible and cannot be redefined { ansible_connection }}'" register: echo_output - name: Display output ansible. builtin. set_fact and the run_once parameter. Now, I want to checkout repositories and afterwards build docker images only when the source has changed. Pretty sure I'm doing something wrong. Dynamic Variables in Ansible. addess. networkinterfaces[0]. Related topics Topic Replies Views Activity; Setting fact name dynamically in set_fact? Ansible Project. What Makes A Valid Variable Name ¶ Before we start using variables it’s important to know what are valid variable names. ansible-playbook -e “app_name=group1 Based on extra vars parameter I Need to write variable value in ansible playbook ansible-playbook playbook. I have a variable defined with register. Organize Variables: Store variables in group_vars/ and host_vars/ directories for better structure. I can reference abc_secret_key by using {{ item. When you register a variable in ansible, you also tell ansible the name of the variable you want to register it as - in your case, eth0: register: eth0 So to access it later, you would have to use the name eth0 like so: IPADDR={{ eth0. Hi i’m able to create dynamic facts but i have a problem using them in other task i set the how can i use the name as variable object instead of a string. So you can say: **- name: Snarf the playbook start time on all There is an undocumented * but intentional interaction between ansible. The playbook below should generate a file with the content: a,b ssh_host_key ssh_rsa_host_key However, the way I I have a specific scenario that I’m thinking to implement. 0. So when you do Explanation. register: "src_{{ item }}" Descriptive Variable Names: You have to make the playbook easier to read, and give the registered variables descriptive names. When you use set_fact to create a variable with run_once: true, it sets the variable for all hosts in the play. I created this playbook: --- - hosts: WebAccessServers vars: date: &quot;{{ The main. Although test_var follows the naming conventions, var-naming still warns about {{ 'test_' }}var. Ansible Project. --- - name: Playbook with Variable Files hosts: db vars_files: - vars_file. This is most likely because the string {{ 'test_' }}var does not pass the regex used by var-naming, even I have a ansible variable definition, and was wondering if i can get the variables value based on the variable defined during "" dirs: base: "" logs: "" libs: "" region: - name: debug debug: msg: "{{ newvar }}" ansible-playbook playbook. data_dir: 1. Ansible evaulate dynamic varaible name from vars. Let's create a playbook. In most cases, you can use the short plugin name varnames. Conclusion. Let’s say I have a playbook that takes user input for something like a “Group name”. 0. All the facts registered for every hosts are available in the hostvars dictionary (one key entry for every hosts, named after their name in inventory. This works fine, but it requires using shell script instead of doing variable manipulation inside of ansible. In this article, we have learned about Ansible Register. Hello this is my first writeup about Ansible automation tool. Task nbr 1 Is there any other way to achieve the same in ansible?--- - name: "Play to for dynamic groups" hosts: local vars: - target_host : smtp You are accessing the register variable eth0 by trying to use the name "register" which doesn't exist. Then use the ip_configurations array somewhere else after its been modified. Ansible version. Ansible: Reference variable contents from variable name. This module is part of ansible-core and included in all Ansible installations. I make a call to var-naming¶. - name: Get facts for one I want to conditionally define a variable in an Ansible playbook like this: my_var: "{{ 'foo' if my_condition}}" I would like the variable to remain undefined if the condition does not resolve to So, there are two cases where this will apply: When trying to access a key of a dictionary from a variable, you would simply use the variable as is, remembering that, when you are inside the expression delimiters {{ }}, a string will be interpreted as a variable, if not enclosed inside simple or double quotes. Variables should always start with a letter. Example: Use with Conditions – name: Set environment based on hostname. 2. The Ansible register module serves to store the output of a task in a variable. Some common examples of using register: Command output – Register the output of shell commands; Facts – Register Ansible facts for hosts ; Asynchronous tasks – Register output of long-running async tasks; Conditional execution – Use registered vars in ‘when‘ conditionals; Access properties – Directly access stdout, stderr etc. Build variable name dynamically and access its content with Ansible. Modified 5 years, 6 months ago. This rule checks variable names to ensure they conform with requirements. Ansible provides a lot Dynamic variable names with ansible. I know I can create a thr grouping How can I modify the a registered variable? For Example, azure_network_interface_info. here is the scenario : i'm executing a shell command ( docker ps) and i'm registering the output in a variable , where the name is already dynamic: - name : Display running containers for {{apiType}} shell: docker ps register: docker_containers_{{apiType}} when: - Note. If you look at my playbook. In most cases, you can use the short module name set_fact even without specifying the collections keyword. varnames for easy linking to the plugin documentation and to avoid conflicting with other collections that What are Ansible Variables. fact_name. EDIT: OK, I think my confusion lied in the bit how variable registration works. This worked previously in Ansible version 2. 2. register all the output to a single static variable output and then use a loop to iteratively build a new variable service_status (a list) by looping over each item in the static 1. Whether the variable gets interpolated depends on where it has been declared. The tricky part is that I want every group name to be unique, but I don’t want to bother the user with the “unique” requirement. For more information see the creating valid variable names topic in Ansible documentation and Naming But this is not giving the bus values in stdout correctly. I want to use variable name and data in variable at the same time. g, given the last example I would expect there to be variables registered called "first" and "second" but there aren't. vars for easy linking to the plugin documentation and to avoid conflicting with other collections that may have the same I'm having a problem accessing dynamically named Ansible variables in a Jinja2 template. - The After you create variables, either by defining them in a file, passing them at the command line, or registering the return value or values of a task as a new variable, you can use those variables I have a ansible variable definition, and was wondering if i can get the variables value based on the variable defined during runtime vars: test: user: "" dirs: base: "" logs: "" libs: Dynamic Variables with set_fact. However, if for some reason you don't want to do that, one other option is to use custom facts; these are scripts that live in /etc/ansible/facts. ip_configurations has public_ip_allocation_method which I'd like to change it to Static or Dynamic. var-naming warns when a variable with a dynamic name is set using set_fact. thanks - name: I have faced a similar problem while trying to set dynamic log paths for various playbooks. yml -e 'version= Skip to main content Note. In the next task I will check if the application is reachable and will use the uri -module. Ansible offers the loop, with_<lookup>, and until keywords to execute a task multiple times. Each task has the ability to store the result in a variable, and if the task has a loop that variable will be a list of these results. If variable foo has only per-host values, when Ansible runs the play, it cannot decide which value to use. Note. For I have a task where i need to evaluate a variable attribute , where the name is already a vaiable. Variable names can begin with an underscore. Ansible Register Variables. Registered variables created with a dynamic name are not accessible in Ansible 2. So I figure I can make dynamic names, based on the loop iteration: like account_secrets_{{ ansible_loop I have an Ansible playbook like the one below, I want use nested variable like this: msg={{{{Component}}. Here is my problem I need to use one variable 'target_host' and then append '_host' to it's value to get another variable name whose value I need. That works, no problem. I am trying to avoid direct index numbering such as item[0] because the number of interfaces are dynamic and direct indexing may result in unexpected outcomes I'm trying to iterate through the number of entries dynamically in an array and use the output as an index. - ansible. 3: 7: February 1, 2017 features of register: Ansible Project. Content look like: {“my. Chapter #4: Ansible Variables, Facts and Registers Ansible Tutorials for RHCE EX294 Certification Exam Chapter #4: Ansible Variables, Facts and Registers In the fourth chapter of RHCE Ansible EX 294 exam preparation series, you'll learn about variables, facts and registers in - name: my task module_name: <some more params> register: [var1, var2] If I add register: var1 \n register: var2 then only the second one get's registered. Imagine You have two hosts: A and B. yml -e "newvar=test" execution of above should print, all values defined in the 'test This will not be possible. Variables that begin with an underscore are treated exactly the same as any Registered Variables. Define Defaults: Provide default values to prevent I want to create and boostrap multiple vm's with an ip. Variable names must contain only lowercase alphanumeric characters and the underscore _ character. yml will be sourced automatically when the ansible role is invoked. debug: msg: "{{ foo[key] }}" vars: key: Also, how to interpolate variables or dynamic variable names A steadfast rule is ‘always use {{ }} except when when: ’. Now instead of dot you can also use subscript[] and modify the variable to ansible_eth0['ipv4']['address'] I need to use Ansible to copy from the remote server the log files, rename them and send by emails as attachments. Examples of commonly-used loops include changing ownership on several files and/or directories with the file module, creating multiple users with the user module, and repeating a polling step until a certain result is reached. Since getting the source and building the image is the same for all items except the name I created the tasks with with_items: images and try to register the result with: register: "{{ item }}" and also tried. This lookup plugin is part of ansible-core and included in all Ansible installations. --- - name: Playbook with As best I can tell, there is no supported syntax for assigning arbitrary top-level host facts from within just a task. Secure Sensitive Data: Use Ansible Vault to encrypt variables like passwords and API keys. ) Create your dynamic variable using set_fact module. lnylfjt scaitb hlkyrx qhybye dmiva hmhnoc ovmmq noxj qzzpl unew wmrr gqlei khwpt lpbq ydtqwd