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What is GitOps?

GitOps is a method used for Continuous Delivery. It uses Git as a single source of truth for infrastructures like declarative infrastructure and applications. On Git, set delivery pipelines, make pull requests, accelerate and simplify both the application deployments and the operations task to Kubernetes. By using Git, create new features in the Applications rather than focusing on operations tasks.
  • Code - We can write our application code and push it to Git.
  • Build (Pipeline as Code) - Build pipeline code(yaml) in Git to build code using CI tools.
  • Provision (Infrastructure as Code) - Write a terraform file or Ansible playbook in Git to provision a Kubernetes cluster.
  • Deploy - Write a deployment manifest for Kubernetes or based on the application.

GIT

  • Distributed Version Control System
  • Manage Source Code
  • Any Text file tracked
  • Collaboration

Ops

  • Configure,build,test,deploy
  • CI/CD
  • Monitor, fix
  • Upgrades
  • Rollbacks
  • Automation

GitOps

  • Ops practices using Git
  • Use Git as a source of truth
  • Drive operations through the git repo
  • Get version control, history, peer review, and rollback
  • Continuous Delivery- Automates pipelines
  • Webhooks: push to trigger build/test
  • PR's & merge branch to deploy

GitOps Pattern

  • CI build artifacts
  • Updates Config (in a git repo)
  • Trigger Rollout (PR merge/commit)
  • Observe
  • Control

Git Source of Truth

  • Infrastructure as Code - Terraform, CloudFormation.
  • System Configuration as Code - Ansible, Chef, Puppet.
  • Application Configuration as Code - Kubernetes, Hasura.
  • Application Source Code

CI and CD incorporate values, a set of operating principles, that enable application development teams to deliver changes more reliably. Source: Continuous Integration, and Continuous Delivery

How GitOps Works?

The deploy component is divided into two parts: one is a Flux Automator used to observe new builds and update configurations on the new release, and the second Flux synchronizer to ensure that the orchestrator is correct to state. Workflow for the new creation or updating of a new feature -
  • First, make a pull request for a new feature pushed to GitHub.
  • Go for the code review and merge to Git.
  • Then Git automatically merges the triggers, the process of CI, builds the pipeline, runs tests, and then builds a new image and deposits it to a registry.
  • The Deployment Automator checks the image registry, reviews the image, and then it pulls the new image from the registry and updates the YAML file of that project in the config repo.
  • The Deployment Synchronizer is installed on the cluster and detects that the cluster is out of date. Then It pulls the changes in the manifests from the config repo and then deploys the new feature to production.

What are the Benefits of GitOps?

The below are the benefits of GitOps:

Fast development

GitOps manages all the updates and features of the Kubernetes more rapidly. By continuously pushing features to updates making businesses more agile and respond quickly to the customer as per the demands.

Better Ops

GitOps have the complete pipeline. Continuous Integration and Continuous Deployment pipelines have driven by pull request and operations tasks fully reproducible with the help of Git.

Stronger Security Guarantees

Git backed with strong cryptography to manage changes in it, sign amendments to prove the author and origin key of the cluster's desired state. If the immutable and auditable source of truth recreates a new system independently of the compromised, it reduces downtime with much better incident response.
AWS DevOps Pipeline is the latest method of creating and deploying software, plus it has brought a cultural shift in companies as well. Source: Setting up DevOps Pipeline on AWS

Why GitOps Matters?

Git is a tool to support the various project and team setups by coordinating the workflow of projects. Git is a tool set up on different Operating Systems simultaneously without thinking about the Operating System used while working on large projects. GitOps uses a single tool and interface to control infrastructure. It provides version control for all of the changes done in configuration. Moreover handy for rolling back changes and auditing purposes. It also detects changes and generates automatic alerts. No need to learn a new tool to manage infrastructure. It is an Open Source system used by a large community.

How to Adopt GitOps?

The below are the steps to adopt the GitOps for continuous integration and deployment.
  • Create a new Repository.
  • Create a new directory, open it and perform a "git init" to create a new git repository.
  • Checkout Repository.
  • Create a working copy of a Local repository by running the command "git clone /path to the directory.
  • While using a remote server, enter Username and Password.
  • Create Required Files as per the requirements of the Application.
  • Then by using "git add " add those files on the Repository at log in.
  • After Adding files, do the commit using the command "git commit -m "Commit message."
  • Changes are done on local working, now copy to send those changes to the remote repository, execute "git push origin, approve code review and merge to Git.
  • After Code is pushed on Git Repository, then the CI pipeline automatically starts and runs tests.
  • Then build a new Image saved in Registry Like Docker Hub.
  • Git automatically merges, triggers the CI process, builds the pipeline, runs tests, builds a new image, and deposits to a registry.
  • The Deployment Automator checks the image registry, reviews the image. Then it pulls the new image from the registry and updates the YAML file of that project in the configuration repo.
  • The Deployment Synchronizer is installed on the cluster and detects that the cluster is out of date. It pulls the changes in the manifests from the configuration repository and then deploys the new feature to production.
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Managed services for Enterprises to facilitate Automated Security Alerts, Single Click Deployments, and Monitoring Solutions. Managed DevOps Services and Solutions

What are the Best Practices of GitOps?

The core best practices of GitOps are below:
  • Declarative Infrastructure as Code.
  • Immutable deployment.
  • Code & config version controlled.
  • Rollback functionality.
  • Operational changes made by Pull Request; don't let CI push updates into the Kubernetes cluster or use kubectl by hand.
  • Build each container image just once and 'promote' it through each test sequence/environment, do not rebuild each time. Must update declarative configuration changes in Git.
  • Monitorable & observable services & infrastructure.
  • Different tools detect/alert divergence.
  • Sync tools enable convergence.
  • Completely automated delivery pipeline.

What are the best GitOps Tools?

Listed below are the best tools for GitOps.

A Holistic Strategy

With effective continuous delivery solutions, Enterprises can Lower risk releases, Improved Stability, and Higher Reliability. To incorporate this strategy, we advise taking the following steps -

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