If you create Virtual machines often and manually install the same tools repeatedly, this post is for you. Using ansible, I have written a simple playbook to create the virtual machines within seconds. The playbook would automatically install any desired software you want. The playbook would also run any command you would like to execute …
An Amazingly fast way to create Virtual machines Read More »
There are Multiple choices are available to run ansible playbooks via GUI, like AWX, Ansible tower, ansible semaphore, etc. However, this post will demo how to set up an ansible semaphore pod in the Kubernetes cluster. At the time of writing this post, the official document of ansible semaphore provides the following installation methods: Installing …
This post will provide an example and explain how to write a simple callback plugin for ansible. Although ansible comes with multiple callback plugins out of the box, we can write our own callback plugin for extended customization for our requirements. What is a callback plugin? A callback plugin is a chunk of independent pieces …
How to write a simple callback plugin for ansible Read More »
This post will show the most straightforward yet extremely powerful way to simulate traffic load in your environment, including the Kubernetes cluster. We will be using fortio for traffic generation for desired duration and requests per second. To see fortio in action, let’s see an example:we assume our application is an Nginx pod and will …
This post will cover a basic example of canary deployment using istio in the Kubernetes cluster. In canary deployment, the software update is rolled out to a small portion of the users, so the developers can analyze the performance and work on the provided feedback without impacting all the users. Once the developers are happy …
canary deployment and traffic distribution in Kubernetes Read More »
Ansible is highly configurable and extendable for users. This post will show us how to use the callback plugins(shipped with ansible) to extend the playbooks. Ansible ships with many great callback plugins, a majority of these plugins are to control the output format of the playbook or to generate some sort of notification. Some examples …
In ansible, we there are multiple ways to loop over a task. However, there are minimal ways to see what is happening in the background during the loop is getting executed. Sometimes, we want to display the loop output for each iteration to the user. 1. We use loop or with_items to iterate over the …
How to print the output in during loop in ansible Read More »
Ansible is a great tool for automation; it has many ways to parse data from one form to another. For example, ansible ships with Jina2 filters and a bunch of ansible filters(as an extension to Jinja2 filters) for parsing the data. Using jinaj2 filters and ansible provided filters, we can do a lot of things; …
In this post, we will describe one of the simplest ways to configure a Kubernetes cluster using a tool called kurl. Note that, kurl is listed as one of the “Certified Kubernetes – Installers” for setting a Kubernetes cluster. You can see the whole list of certified installers HERE. Kurl is a very flexible tool …
Most modern applications use JSON and YAML for communication and configuration. However, there are many applications still using XML. If for some reason, you have to work with an XML file over bash, this post will cover many examples to extract the values from an XML file. Note that there are other alternatives to xmllint …
