Ansible command output to variable

By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. The dark mode beta is finally here. Change your preferences any time. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information.

New to ansible and playbooks, I'm trying to run a linux command and use the output of that command as a variable. However, it is using the item name as the variable instead of the output of the command.

Access it directly:. Learn more. Ansible - pass output of shell command to variable Ask Question. Asked 2 years, 2 months ago. Active 2 years, 2 months ago. Viewed 6k times. Dhaval Jardosh 5, 2 2 gold badges 15 15 silver badges 44 44 bronze badges. The whole idea makes no sense.

Complete Shell Scripting - How to store output of a command into a variable or into a file ?

It's fine to be new to some topic, but in such situation start following docs and basic tutorials instead of posting bad questions on SO. Active Oldest Votes. Konstantin Suvorov Konstantin Suvorov That makes sense and worked perfectly. Thank you for your help. Sign up or log in Sign up using Google. Sign up using Facebook. Sign up using Email and Password. Post as a guest Name. Email Required, but never shown. The Overflow Blog.

Podcast Cryptocurrency-Based Life Forms. Q2 Community Roadmap.You can now connect to a device and get a green success that you get a hello world like command such as show hostname or show inventory and get the GREEN success on Ansible. Now what. You may want to see the output of the command that you sent and got information back. This is your post on getting started. This is the process that I typically go through when developing a playbook for use.

So the terms will be dictionary hashes and lists lists. This can get extremely elaborate. I am going to attempt to keep this about the debug commands along the way. First I will just give a quick diagram of the lab environment. I will be accessing the devices via a management network to show various things. That can extend as well to any other platform using the standard Ansible network modules. As we look at the output, the task itself creates the part "msg": This itself shows the output dictionary.

This has several keys: and values. Breaking down each of the keys and values in the output:. These outputs are in the forms of lists, so if we want to get access to the actual string of the command show run interface loopback 0? This will be shown with the updated playbook a second debug has been added :.

This means that you can send multiple commands in a single task. Updating the playbook to be this:. We can now see how you may get at particular command outputs, while running multiple commands during one task on the device. From what I can tell, these commands are run sequentially, and not with separate SSH sessions, as during my testing I only ever saw a single SSH session on the device. This is something that I stumbled upon at some point that was helpful in multiple play playbooks.

You have multiple plays in a playbook right? So how do you get at information from a previous task? You access it via the keyword variable hostvars. I also added another DNS provider to test my pings to in order to show this. You can also loop over the output of the commands as well. I added in some more lines to the debug that will show how you can loop over all of the commands you issued.

We want to get to each of the stdout outputs. We now get the following output related to that task:.

ansible command output to variable

Playbook Design Process Make sure that I can connect to the devices with a simple show command Get necessary show output Debug the outputs of the show commands Set facts or take more action based on other outputs This can get extremely elaborate. Lab Setup First I will just give a quick diagram of the lab environment.

Playbook Play and Task First, the initial connection and a simple show command. Breaking down each of the keys and values in the output: changed : This is a boolean field where you will see if the variable stored output of a task had made a change.

This output is in the format of a list These outputs are in the forms of lists, so if we want to get access to the actual string of the command show run interface loopback 0?Get the latest tutorials on SysAdmin and open source topics.

2019 ninja 1000 forum

Write for DigitalOcean You get paid, we donate to tech non-profits. DigitalOcean Meetups Find and meet other developers in your city.

Become an author. Ansible is a modern configuration management tool that facilitates the task of setting up and maintaining remote servers. This cheat sheet-style guide provides a quick reference to commands and practices commonly used when working with Ansible.

For an overview of Ansible and how to install and configure it, please check our guide on how to install and configure Ansible on Ubuntu To test that Ansible is able to connect and run commands and playbooks on your nodes, you can use the following command:. The ping module will test if you have valid credentials for connecting to the nodes defined in your inventory file, in addition to testing if Ansible is able to run Python scripts on the remote server.

Cf4 ionic or covalent

A pong reply back means Ansible is ready to run commands and playbooks on that node. By default, Ansible tries to connect to the nodes as your current system user, using its corresponding SSH keypair. To connect as a different user, append the command with the -u flag and the name of the intended user:.

If you need to use password-based authentication in order to connect to the nodes, you need to append the option --ask-pass to your Ansible command. If the remote user needs to provide a password in order to run sudo commands, you can include the option --ask-become-pass to your Ansible command. This will prompt you to provide the remote user sudo password:. This is useful for setting up per-project inventories that can be included in version control systems such as Git:. Ansible supports inventory scripts for building dynamic inventory files.

This is useful if your inventory fluctuates, with servers being created and destroyed often. You can find a number of open source inventory scripts on the official Ansible GitHub repository. After downloading the desired script to your Ansible control machine and setting up any required information — such as API credentials — you can use the executable as custom inventory with any Ansible command that supports this option.

For more details on how to use dynamic inventory files, please refer to the official Ansible documentation. To execute a command on a node, use the -a option followed by the command you want to run, in quotes.

It is also possible to run Ansible modules with the option -m. The following command would install the package vim on server1 from your inventory:.

Import tkinter

Before making changes to your nodes, you can conduct a dry run to predict how the servers would be affected by your command. This can be done by including the --check option:. To run a playbook and execute all the tasks defined within it, use the ansible-playbook command:. To overwrite the default hosts option in the playbook and limit execution to a certain group or host, include the option -l in your command:.

The option --list-tasks is used to list all tasks that would be executed by a play without making any changes to the remote servers:. Similarly, it is possible to list all hosts that would be affected by a play, without running any tasks on the remote servers:. You can use tags to limit the execution of a play. To list all tags available in a play, use the option --list-tags :.

You can use the option --start-at-task to define a new entry point for your playbook. Ansible will then skip anything that comes before the specified task, executing the remaining of the play from that point on.By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. The dark mode beta is finally here. Change your preferences any time.

Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. New to ansible and playbooks, I'm trying to run a linux command and use the output of that command as a variable. However, it is using the item name as the variable instead of the output of the command. Access it directly:.

Learn more. Ansible - pass output of shell command to variable Ask Question. Asked 2 years, 2 months ago. Active 2 years, 2 months ago. Viewed 6k times. Dhaval Jardosh 5, 2 2 gold badges 15 15 silver badges 44 44 bronze badges.

How To Assign Output of a Linux Command to a Variable

The whole idea makes no sense. It's fine to be new to some topic, but in such situation start following docs and basic tutorials instead of posting bad questions on SO. Active Oldest Votes.

Sample letter to judge for child custody

Konstantin Suvorov Konstantin Suvorov That makes sense and worked perfectly. Thank you for your help. Sign up or log in Sign up using Google.

ansible command output to variable

Sign up using Facebook. Sign up using Email and Password.

ansible command output to variable

Post as a guest Name. Email Required, but never shown. The Overflow Blog. Podcast Programming tutorials can be a real drag. Featured on Meta. Community and Moderator guidelines for escalating issues via new response…. Feedback on Q2 Community Roadmap. Technical site integration observational experiment live on Stack Overflow. Dark Mode Beta - help us root out low-contrast and un-converted bits. Linked 3. Related Hot Network Questions. Question feed.By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service.

The dark mode beta is finally here. Change your preferences any time. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information.

Currently, I managed to do it by using String variable using Jinja2 template like this:. The result will return 3 as expected output. However, I don't know how to do that for integer variables as it will return an error when doing it the same way.

Q: "I don't know how to do that for integer variables as it will return an error when doing it the same way. A: You haven't done it the same way. All four options in the second example are different compared to the first one.

In fact, both string and integer give the same result when used in the first example. If the variable flagStr is an integer flagStr: 0 it's not necessary to convert it to an integer. It does not hurt either.

The task below works as expected. Learn more. Ask Question. Asked today. Active today. Viewed 10 times. Vladimir Botka Fitri Izuan Fitri Izuan 2 2 silver badges 11 11 bronze badges. Now, if your are But this will break if it accidentally becomes a string e. Active Oldest Votes. Vladimir Botka Vladimir Botka Sign up or log in Sign up using Google.

Sign up using Facebook. Sign up using Email and Password. Post as a guest Name. Email Required, but never shown. The Overflow Blog. Podcast Programming tutorials can be a real drag. Featured on Meta. Community and Moderator guidelines for escalating issues via new response….

Feedback on Q2 Community Roadmap. Technical site integration observational experiment live on Stack Overflow. Dark Mode Beta - help us root out low-contrast and un-converted bits. Related 5.Ansible registers are used when you want to capture the output of a task to a variable. You can then use the value of these registers for different scenarios like a conditional statement, logging etc. The variables will contain the value returned by the task.

The common return values are documented in Ansible docs. Some of the modules like shell, command etc. These will be documented in the module docs. Each registered variables will be valid on the remote host where the task was run for the rest of the playbook execution.

Let us see how we can capture the output of a task to a register. Suppose you need to print all the. Yo can see all the returned values in the output section. You can select the individual parameter from the above output by appending the name with the return value. It is very useful when you need to use the individual values. In the following task, I am trying to make a backup of all the text files. For that, first I will store the variables in a register and iterate through each file.

For more information on how to work with loops in Ansible, you can refer this post. Basic Example of a Register Variables Let us see how we can capture the output of a task to a register.

Ansible - Variables

Ansible Variables. The Basics of Ansible Variables. Working with Ansible User Module.By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service.

Server Fault is a question and answer site for system and network administrators. It only takes a minute to sign up. How do I see stdout for ansible-playbook commands?

It would be great if I could figure out how to do this immediately, so if something fails or hangs I can see why. For multiline output this is much nicer, e. In your ansible. Sign up to join this community. The best answers are voted up and rise to the top. Home Questions Tags Users Unanswered. How to see stdout of ansible commands? Ask Question. Asked 6 years, 7 months ago.

Active 3 years ago. Viewed k times. QuinnBaetz QuinnBaetz 1, 2 2 gold badges 9 9 silver badges 3 3 bronze badges.

ansible command output to variable

Active Oldest Votes. I think you can register the result to a variable, then print with debug. I had trouble getting Java output using this. I was having an issue where ansible would appear to hang. The reason was that I was using the wrong username for an rsync command, which spooled the interactive password request, which just hanged ansible.

It was very difficult to debug - but if I could see stdout in realtime, I would have immediately realised what I'd done wrong. I would LOVE this functionality, if possible. Let's imagine the first task never terminates perhaps it is foolishly waiting for user input Moreover, the register module, or whatever it is doesn't produce objects that have the stdout or stderr variable set Mars Mars 1, 1 1 gold badge 6 6 silver badges 2 2 bronze badges.

Lifan 170f

If I want to send out. I'm using ansible-playbook 2. Jason S Jason S 2 2 silver badges 5 5 bronze badges.

Nice callback plugin, simple post-processing can extract standard output only. The Overflow Blog. Podcast Cryptocurrency-Based Life Forms. Q2 Community Roadmap. Featured on Meta. Community and Moderator guidelines for escalating issues via new response….


comments

Leave a Reply

Your email address will not be published. Required fields are marked *