DevOps(Day-42) : Launching your Kubernetes Cluster with Deployment

 

  • What is Deployment in K8s?

  • Task-1: Create one Deployment file to deploy an application using "Auto-healing" and "Auto-Scaling" features.

In generic terms, Deployment is the method of applying the code builds in the server after successful testing of the code. This will give the entire outcome of how the application works on production. Therefore Deployment of the code needs to happen in a smooth and error-free manner.

In the IT industry, for deployment Kubernetes is used. Using K8s deployments helps you maintain the stability and high availability of your containers. For example, if a node crashes, you’ll want to have a deployment or ReplicaSet in place to replace failed pods. Unless you want to customize the declarative orchestration updates, it’s better to allow deployments to manage your ReplicaSets than it is to manage them directly. Deployment is made up of the following components:

  • YAML file: A YAML file describes the desired state for the Kubernetes cluster.

  • Pods: Pods consist of containers, configurations, and environments to run the applications.

  • ReplicaSet: This is a group of identical pod instances, configured so that the number of running pods always matches the number of pods specified by the YAML file. It ensures that a new pod is created when one fails.

  • kube-scheduler: The kube-scheduler is a component of the control plane, and declares how the pods and ReplicaSets are deployed in the worker nodes.

  • kube-controller-manager: This is another component of the control plane. It watches and modifies the present cluster state to match the desired state defined in the YAML file. It creates, updates, and removes pods and ReplicaSets.

  1. Write the deployment file on the server for the application that is ready for deployment.

  1. Run the deployment file using the kubectl command.

    $ kubectl apply -f deployment.yml

  2. Now, check if the deployment is running using below kubectl command.

    $ kubectl get deployments

  3. We have used replicas as 2. This means every time two pods will be running. List the pods.

    $ kubectl get pods

Thanks for reading my article. Have a nice day.

Comments

Post a Comment

Popular posts from this blog

DevOps (Day-1) Introduction

Image
  TABLE OF CONTENTS Infrastructure Automation Why DevOps is Important? What is DevOps? As the name indicates:- Dev + Ops = Development + Operations. Development i) Backend Developers ii) Front-end Developers iii) QA Operations i) System admins ii) Network admins iii) Database admins The practice of operations and development engineers participating together in the entire service lifecycle through a pipeline from design through the development process to production support. This process is known as DevOps. This is a process of automating the whole infrastructure. Now here comes a query, what are we automating? We are automating the whole team's work from the code-building stage to code deployment. Scenario 1:- In a company, there is a project in which developers are writing the code and deploying it to the QA environment frequently for each sprint. This code is then tested by the testing team. Suppose there is a situation of mishap happens where the testing team used the older code
Read more

DevOps(Day-3) - File Management in Linux

Image
File Management in Linux TABLE OF CONTENTS In Linux, most of the operations are performed on files. And to handle these files Linux has directories also known as folders which are maintained in a tree-like structure. Though, these directories are also a type of file themselves. Linux has 3 types of files: Regular Files :  It is the common file type in Linux. it includes files like – text files, images, binary files, etc. Such files can be created using the touch command. They consist of the majority of files in the Linux/UNIX system. The regular file contains ASCII or Human Readable text, executable program binaries, program data and much more. Directories :  Windows call these directories as folders. These are the files that store the list of file names and the related information. The root directory(/) is the base of the system, /home/ is the default location for user’s home directories, /bin for Essential User Binaries, /boot – Static Boot Files, etc. We could create new directories
Read more

DevOps(Day-2) Linux

Image
  Linux It is an operating system first released on September 17, 1991, by Linus Torvalds. It comes from the family of Unix operating system which is a black terminal screen that provides excellent security. Basic Linux commands:- Check your present working directory. The command used to check the directory you are currently at is " pwd ". List all the files or directories including hidden files. " ls " - It is the command used to list the files in the present directory. There are multiple extensions that can be used along with ls command such as:- -a  :- It displays all the hidden files in the directory. -l  :- It gives a long listing of files. -R  :- gives a recursive listing, including the contents of all subdirectories and their subdirectories and so on. -t  :- lists the files in order of the time when they were last modified (newest first) rather than in alphabetical order. -r  :- lists the files in the reverse of the order. -i  :- displays all the files with t
Read more