Today, every software company likes to embrace DevOps and cloud-native technologies to ensure they aren’t left behind.Not just to improve yourself but to keep up with today's digital world and competition, it is a must to be ahead of the technology curve and set the bar high. As we move along this cloud-native space, we come across many buzzwords in which some stay, and some vanish and become a fad. There is a new wave in the cloud-native ground, and it is GitOps. We will discuss this topic in our article today and see whether it is here to stay or just like any other buzzword.
Image credits: Inspired from vmware
GitOps is a cloud-native practice for deploying software in which Git is used as a single source of truth for any deployment resources that happen in the system. Whenever any new deployment rolls out, developers are required to define everything through Git. With this approach, it becomes easier to automate deployments and helps in higher observability. This improves deployment confidence within the DevOps team and boosts overall developer productivity.
GitOps requires defining the resources declaratively through Git so that you can have the state of your resources maintained easily. It encourages automating the deployments with minimal or no human interaction and access to roll back quickly to the previous state if something unexpected happens.
GitOps enables developers to push the infrastructure code into the environment repository and notice that a change has occurred. GitOps performs the needed changes to the environment of the software and infrastructure then moves it further into the CI/CD pipeline.
The term GitOps was originally invented and popularized by the engineers at Weaveworks and presented to the world of DevOps as a set of best cloud-native practices coupled with tools from Weaveworks to help developers operate the complex Kubernetes workflows via Git.
GitOps basically works on the principle of making Git the source of truth that includes moving everything to code, storing and maintaining everything in Git. When it comes to deployment, making use of an operator deploy what is configured in Git and Yaml in a declarative fashion. Since all the developers are primarily friendly with Git, GitOps simplifies the complex workflow for them.
So when it comes to Kubernetes, the app code, container images, and all related manifest files will be stored in Git, and any changes are made through Git as a single source of truth.
GitOps can have two types of deployment strategy - Push pipelines and Pull pipelines. The distinction between them is in the way we ensure the deployment environment matches the desired infrastructure.
Push pipeline strategy - CI/CD tools play a vital role here, and many use this strategy where the source code and deployment manifest files are stored in a single repository. Whenever a new update happens, the build pipeline triggers. The pipeline creates the container images and pushes the recent changes to the environment.
The pull pipeline strategy is just the opposite. The container image and declarative configuration (that are written in YAML format) changes are pulled into the cluster from inside the cluster amidst the CD engine running inside the cluster.
There are four basic postulates on which GitOps works,
This is how a DevOps pipeline and GitOps pipeline look like,
Image source: TechTarget