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Stage to Integrate Scalable Jenkins on Top of a Kubernetes Cluster

Monday, 21 September 2020 / Published in Cloud Native Developers, DevOps-Transformation, Managed Cloud Services

Stage to Integrate Scalable Jenkins on Top of a Kubernetes Cluster

The use of Jenkins has a huge benefit, which gives a continuous way for its integration and its scalability. Let us have a look at how to get the Kubernetes cluster set up. This article will surely share the details that are worth knowing with its importance.

The IT sector has grown up to a great extent and thus in this modern era, we are very affected by the plugin and its configuration. The modern era of the 21st century demands this set of work which gives 100% accuracy and perfection in the work. Now when talking about the service, here is the newest and the latest service that is conquering the IT sector. The service here we are talking about is deploying Jenkins in Kubernetes. Jenkins is well-known for its open-source and its continuous integration server, and this is the service that is being used by some of the renowned companies across the globe.

Some of the famous companies and biggest organizations like eBay, Netflix, LinkedIn, Yahoo! and many others use this latest service of Jenkins on Kubernetes. All of these big players are certainly having an enormous base of codes and a huge amount of building plans in Jenkins, and this is the service parallel 24/7. There would be a time where there would not be a base of having these codes, thus one Jenkins instance will grow at a faster pace. There are many such situations where there is a need to get simple answers to it and for the same what we need is to have simple-scalability.

Jenkins Scalability
Scalability is the process and measure that shows and derives the ability of a system to expand its capabilities that handle an additional load. There is a side that is termed to be the strongest part of Jenkins its scaling features is indeed out-of-box. The model on which Jenkins is based is master/slaves. Here the term slaves are called agent instances and masters are called as one main Jenkins instances. The responsibility of this process is mainly for segregating jobs across the slaves. Well, on gearing this, it sounds simple correct? Well, this is indeed a simple picture that is helping to visualize as to what was there before and after scaling.

Benefits of Jenkins Scalability:

Every service that comes up has some of the benefits and advantages associated with it. Below mentioned are a few of them. Just have a look at it.

(1) It can run many more build plans in parallel.
(2) Auto replacement of corrupted Jenkins instances.
(3) the Auto process of spinning up and removing slaves based on the need and requirements. This in all saves costs.
(4) Distributing the load across different physical machines while keeping the required resources available for each specific build plan.

Well, it is a fact that even if scalability features are available in Jenkins which is out-of-box, it does not mean that the process of making scalable Jenkins is easier and with that has a lot of fun. There is a saying that good things come with hard work. The same is with Jenkins too. The first stage would be looking like accepting a challenge, then after it will be considered as hard, and then at the later stage it will be looking to be a fun activity. This would be only when finally there would be several slaves that would be coming on board at each level of the stage when runs build.

There are many of the options available in the market that can assist in implementing the Jenkin scaling. The most powerful option that is available right now is the Jenkins on Kubernetes.

What is Kubernetes?
With each passing day, the demand as well as the popularity of Kubernetes is growing tremendously. The core reason for it is because it is having huge ways and steps that make the pace of the work at a higher level. This is a fact that the demand, need, and use for Kubernetes on Jenkins and its popularity has grown up to a great extent and this is a good way though. Now having said this, let us take a dig and understand what Kubernetes is all about.

So the question is what is Kubernetes? Let’s make it simple and easier to understand. It is an open-source container of orchestration tool, that is created by Google. This is the process to manage the containers at the time in which the applications are running in general. With the process of orchestration, the team can deploy, scale, and operate multiple sets of containers at one single place from different locations.

Kubernetes is the process that is said to be the best tool for managing scalable solutions. Anything can be placed inside the containers if thinking practically. Even Jenkins too is the available process and which is why Kubernetes is a nice option to use for our needs.

Now moving further, let us have a look at some of the installation process that is associated with the process of Jenkins with Kubernetes. Mentioned below is the list for some of them and that can with easily be taken into consideration and along with that they are also the basis for the service too.

● Kubernetes Sandbox Installation
To have Kubernetes in place is the very first stage of the work that needs to be kept in the mind. It is a step that shows how the implementation of scalable Jenkins is possible on top of Kubernetes. Also, it is a good idea and thought if Kubernetes is already installed. But the end-to-end setup of Kubernetes is not at all an easier and simpler task. There is an additional set up required as that compared to others and that is the usual setup of Kubernetes along with extra cluster.

The tool that is taken into consideration for testing purposes on Kubernetes is the Minikube tool. This is a single tool that has been developing on a single node in the Kubernetes cluster and that too on the local machine. The process of getting this installed is simple but at the same time, there is a need to have a virtual box installed on the local machine. If you have a UNIX platform, just use this command to install

● Jenkins Master Installation
The best and foremost way of getting the Jenkins master installed is to create a local docker image that is the base of Jenkins Image. This is the way in which the client can find the official docker repository that is keeping in mind one thing that this installation should be done on the local machine and along with that, there should be each step getting mentioned. Thus for all this, there is a need to create a docker file. Having Jenkins setup as a docker file is highly recommended to make your continuous integration infrastructure replicable and have it ready for setup from scratch.

As soon as you have the Kubernetes cluster in place and the Jenkins image, you can deploy this image on top of the cluster. In order to deploy any application inside Kubernetes, you need to create a deployment configuration, which will be used as the main recipe to ‘cook’ your application inside the cluster.

Kubernetes deployment is presented in a YAML format text file with all the configuration params that might be needed to run your application. Let’s have a look at the basic deployment configuration that is required to run Jenkins inside Kubernetes.

● Jenkins Slaves Configuration
The third stage of the work where it is time to configure Jenkins slaves. With the help of integration and installation of the Kubernetes plugin using the master dockerfile, so there is no need to get anything else installed separately and for the same, there is a need to have required plugin there is already in use.

In order to configure the Jenkins slaves. There is a need to know the URL that will be uses and this is for the Kubernetes master and the internal cluster URL of the Jenkins pod. You can get the Kubernetes master URL by this specified command.

Wrapping Up:
Well, on reading this blog, it is very much clear as to what the service is all about and how Jenkins with Kubernetes is important. So, if you are planning to migrate your server to Jenkins, then Cloud-Stack Group is at your service to serve you. Feel free to connect and get to know what is the service all about and how they can assist you in the entire process.

What you can read next

Cloud Migration Strategies: Benefits, Drawbacks, and Process to Migrate It
Cloud Migration Strategy with CloudStackGroup
Kubernetes: An Introduction to the widely popular container orchestration platform.

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