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 …
In most cases, ansible inbuilt modules are enough to do the job. However, in some cases, it’s either highly complex or impossible to achieve the goal using ansible inbuilt modules. In such cases, many users write their scripts(Eg: bash or python,Etc.), which is fine for most cases. However, there are some downsides to using scripts. …
For writing a custom module, we can use any language of our choice as long as it can return a JSON object. This post will write a simple custom module using a bash script. Typically the choice of language for writing a custom module is python; however, if, due to some reasons, you prefer to …
In Kubernetes with the default configurations, When a deployment is exposed via a service, the traffic is distributed between the endpoints/replicas in a round-robin way. This is great for most cases; however, the cluster administrator sometimes wants a finer traffic distribution control. Kubernetes provided a few more strategies for traffic distribution among the service’s endpoints. …
Changing the traffic distribution of a Kubernetes service Read More »
