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Ansible dynamic inventory python example

Ansible dynamic inventory python example

Ansible delivers simple IT automation that ends repetitive tasks and frees up DevOps teams for more strategic work. Leverage powerful automation across entire IT teams no matter where you are in your automation journey. April 25, by Bill Nottingham. This is the second in a series of posts about how Ansible and Ansible Tower enable you to manage your infrastructure simply, securely, and efficiently. When we talk about Tower, we often talk in terms of control, knowledge, and delegation.

But what does that mean?

How to Use Dynamic Inventory for AWS with Ansible?

In this series of blog posts, we'll describe some of the ways you can use Ansible and Ansible Tower to manage your infrastructure.

In our first blog post, we described how Ansible Tower makes it easy to control the way your infrastructure is configured via configuration definition and continuous remediation. But controlling the configuration of your infrastructure is just one step. You also need control of the components of your infrastructure - your inventory. You need to do day-to-day management tasks on demand.

And Ansible Tower makes those easy as well. A static Ansible inventory is just an INI-style file that describes your hosts and groups, and optionally some variables that apply to your hosts and groups.

Here's an example from the Ansible documentation.

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You can easily enter the same sort of inventory into Ansible as well. Here, we enter the inventory into Tower:. Tower, of course, supports multiple inventories. In this example, we create three inventories 'dev', 'test', and 'prod'each with their own identical sets of servers, but with custom variables for their environment. As seen above, Tower can be a source of truth for your inventory. Ansible and Tower work with these sources through the concept of dynamic inventory.

This inventory can be filtered in a variety of ways - region, image tags, and most any other piece of Amazon metadata.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 needs.

Ansible integrates all of these options via a dynamic external inventory system. Ansible supports two ways to connect with external inventory: Inventory Plugins and inventory scripts.

ansible dynamic inventory python example

Inventory plugins take advantage of the most recent updates to the Ansible core code. We recommend plugins over scripts for dynamic inventory. You can write your own plugin to connect to additional dynamic inventory sources. You can still use inventory scripts if you choose. When we implemented inventory plugins, we ensured backwards compatibility via the script inventory plugin.

The examples below illustrate how to use inventory scripts.

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If you would like a GUI for handling dynamic inventory, the Red Hat Ansible Tower inventory database syncs with all your dynamic inventory sources, provides web and REST access to the results, and offers a graphical inventory editor.

With a database record of all of your hosts, you can correlate past event history and see which hosts have had failures on their last playbook runs.

Ansible integrates seamlessly with Cobblera Linux installation server originally written by Michael DeHaan and now led by James Cammarata, who works for Ansible. Run cobblerd any time you use Ansible and use the -i command line option e.

Add a cobbler. For example:. You should see some JSON data output, but it may not have anything in it just yet. The script provides more than host and group info.

You can still pass in your own variables like normal in Ansible, but variables from the external inventory script will override any that have the same name.

So, with the template above motd. If you use Amazon Web Services EC2, maintaining an inventory file might not be the best approach, because hosts may come and go over time, be managed by external applications, or you might even be using AWS autoscaling. For this reason, you can use the EC2 external inventory script. You can use this script in one of two ways. You must also copy the ec2.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. I'm using Ansible to configure some virtual machines. My VMs are organized in "Environments". In fact the following command doesn't work. I had similar issue, I didn't find any solution, so I just modified my dynamic inventory to use OS Environment variable if the user does not pass --env. Learn more. Pass a parameter to Ansible's dynamic inventory Ask Question.

Asked 4 years, 4 months ago. Active 3 years, 6 months ago. Viewed 6k times. In fact the following command doesn't work ansible-playbook thePlaybook.

ansible dynamic inventory python example

Mr Lister Active Oldest Votes. I had similar issue, I didn't find any solution, so I just modified my dynamic inventory to use OS Environment variable if the user does not pass --env Capture env var in your inventory as below: import os print os.

Rahul Patil Rahul Patil 2 2 gold badges 12 12 silver badges 28 28 bronze badges.

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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. I can actually do this in fabric easily but just wonder how to do this in Python. On the other hand, documentation of the Ansible API for python is not really complete.

I know this question is really old but think that this little trick might helpful for future users who need help for this:. In my case, I did not want to have hosts: all in my playbook, because it would be bad if someone ran the playbook and forgot to include -i I also needed to drive the Ansible Python APIand would rather pass hosts as arguments rather than keep an inventory. I used a temporary file to get around Ansible's requirement, which may be helpful to others:.

This isn't a full answer, but there's some discussion of this topic in this discussion thread. At the end of the first post in that thread, a suggestion is made to create a wrapper bash script for ansible-playbook, which is a bit of a hack but workable. Other things that I've been considering are the use of 'ansible-pull' and the creation of an ansible inventory plugin. I'm also interested in finding the answer to this question, and I'll keep updating this answer as I find more information.

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ansible dynamic inventory python example

How to run Ansible without specifying the inventory but the host directly? Ask Question. Asked 6 years, 10 months ago. Active yesterday. Viewed 75k times.

Seybsen Ngoc Tran Ngoc Tran 1 1 gold badge 8 8 silver badges 8 8 bronze badges. Active Oldest Votes. Surprisingly, the trick is to append aHost and IP address ansible all -i example. In Ansible 1. This is the right answer "ansible-playbook -i example. Then, what should I set as "host" in the playbook so it works with any server? I typically do that and then use -i or --limit on the command line to specify the hosts. I know this question is really old but think that this little trick might helpful for future users who need help for this: ansible-playbook -i Hope this will help.

Arbab Nazar Arbab Nazar For what it's worth, the quotes are a no-op here.Often a user of a configuration management system will want to keep inventory in a different software system. Ansible provides a basic text-based system as described in Inventory but what if you want to use something else?

How to Use Static and Dynamic Inventories in Ansible – Part 4

Ansible easily supports all of these options via an external inventory system. Tower syncs with all Ansible dynamic inventory sources you might be using, and also includes a graphical inventory editor.

For information about writing your own dynamic inventory source, see Developing Dynamic Inventory Sources. It is expected that many Ansible users with a reasonable amount of physical hardware may also be Cobbler users.

You should see some JSON data output, but it may not have anything in it just yet. You can still pass in your own variables like normal in Ansible, but variables from the external inventory script will override any that have the same name. So, with the template above motd. If you use Amazon Web Services EC2, maintaining an inventory file might not be the best approach, because hosts may come and go over time, be managed by external applications, or you might even be using AWS autoscaling.

For this reason, you can use the EC2 external inventory script. You can use this script in one of two ways. You will also need to copy the ec2. Then you can run ansible as you would normally. There are a variety of methods available, but the simplest is just to export two environment variables:. An example profile might be:. You can then run ec2.

Since each region requires its own API call, if you are only using a small set of regions, feel free to edit ec2. There are other config options in ec2. At their heart, inventory files are simply a mapping from some name to a destination address.However, there is an easy solution called ansible dynamic inventory. It is basically a python script which makes an API call to get the instance information when you run the ansible commands.

This will give you dynamic inventory details to manage the AWS infrastructure. In this tutorial, you will learn how to setup a dynamic inventory for AWS using boto and the python script. Install the boto library using pip. The ec2. So comment out and configure the necessary parameter to avoid long query times. This makes API calls to all the regions. So it is better to mention only the specific aws region that you use. Under the [credentials] section you need to mention the aws access key and private key to for the boto library to make the API call.

If you have some instances up and running, you will get the output with all the instance details. If you want to use the dynamic inventory as a default ansible inventory, you need to edit the ansible. Change the inventory parameter value as shown below. Now you can run the normal ansible commands against the dynamic inventory.

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For example, the following command will run a ping command against all the running ec2 instances fetched using the dynamic inventory. From this tutorial, you have learned how to setup the Ansible AWS dynamic inventory. Leave a comment for queries. An author, blogger and DevOps practitioner. In spare time, he loves to try out the latest open source technologies. He works as an Associate Technical Architect.

Follow the steps carefully for the setup. Share via. Facebook Messenger. Copy Link. Powered by Social Snap. Copy link. Copy Copied.Writing a dynamic inventory script for Ansible can be useful for more than just getting a list of hosts to run a play against. It can also function as a standalone command line utility for your infrastructure. The first time I wrote one, I had a difficult time finding information on how to actually do it so I wanted to write about how to make one and then show an example of how it can be extended beyond a simple inventory script by adding additional flags to the scripts.

Let me set the scene, which may sound familiar: due to a lot of tech debt, there are thousands of servers—many of which are not tracked anywhere. A server is often discovered when it stops working or needs to be patched, so new computers are constantly being added to a growing inventory list.

So now a dynamic inventory script I wrote has evolved into a command line utility that can be used to dynamically learn about your infrastructure among other things.

In lieu of a neglected CMDB and tribal knowledge, this command line app now has lots of value and saves me time going forward. Whatever language you choose to write your script in, if passed the --list flag, it should output JSON in this format:. That PR is here. Writing it in Python is probably easiest since Ansible is Python, but take a look at the PR I made and see how it can also be used as an ad-hoc command line utility.

From the scenario I laid out earlier, Spacewalk was the software of choice because every server we had needed to be patched so whenever I found one, I would subscribe it to Spacewalk, add it to some groups, and then there was a lot of metadata also gathered by Spacewalk, which was useful.

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Dynamic inventory scripts can pull from anything as long as you can code it. In my case, since servers were always added to Spacewalk, it grew into the source of truth. Thus, I often found myself needing to query information for other reasons outside of Ansible. After using the Spacewalk dynamic inventory script for some time, I began expanding it to do other things and it became a standalone command line utility. A prime example of this is that I needed to learn how many Redhat servers we had so we could buy the appropriate amount of licenses at renewal time.

Close Menu My Certifications. Where To Get The Information From From the scenario I laid out earlier, Spacewalk was the software of choice because every server we had needed to be patched so whenever I found one, I would subscribe it to Spacewalk, add it to some groups, and then there was a lot of metadata also gathered by Spacewalk, which was useful.

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