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Kubernetes: Mount multiple volumes into the same directory

We often need to mount multiple volumes into the same directory. For example, we need to mount SSL Certificate and Key into the same directory. However, the typical syntax of volumeMount would fail. To do this, projected volume needs to be used. Here is an example: Create Two secrets, we will be mounting them later …

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Istio Profiles and their differences

Istio provides multiple profiles for Istio installation in the Kubernetes cluster. Istio already provides exhaustive documentation about the various profiles and which one to use. The information could be overwhelming for some, so putting the differences in a short and simple format. Note that the post shows the control plane components, not the addons like …

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Simplifying VM Management: Executing Commands in Guest VMs using Virsh

If you are using virsh/qemu for Virtual machine management, then there are many occasions when an administrator requires to run some commands on the guest VM. This is made very simple by “Quem-guest-agent.” This post demos two approaches to running a command in the Virtual guest machine. Prerequisite:(Teststed for Ubuntu Host and Guest Machine) Approach-1: …

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An Amazingly fast way to create Virtual machines

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 …

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Running Ansible Semaphore for GUI in Kubernetes

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 …

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How to simulate traffic in Kubernetes cluster?

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 …

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canary deployment and traffic distribution in Kubernetes

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 …

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