This tool runs in the cluster, to which updates would be applied, and its main function is watching a remote Git repository to apply changes in Kubernetes manifests. In fact, it’s amazing to see how a GitOps workflow can be set up with only a few steps. Among the three tools in this evaluation, it is by far the simplest one. ( Here’s some more on GitOps and CI/CD.) FluxCDįlux is described as a GitOps operator for Kubernetes that synchronises the state of manifests in a Git repository to what is running in a cluster. We can also have approval processes by using pull requests.Īrchitecturally, GitOps will allow us to separate the Continuous Integration (CI) flow of an application from the deployment process, as the deployment process will kick off based on changes to a GitOps repo, not as part of the CI process. When we combine these, we get a system where all changes to an application environment are logged, and we can apply our Git-based tooling to manage the history. If the actual state drifts from the desired state, either correct it or alert operators about it.Once Git is modified, apply changes to the cluster immediately and fully automated.Use only pull requests to modify resources on that Git repo. Store all Kubernetes resource configuration in Git.If that sounds a bit vague, let’s define these four rules of GitOps to make it more grounded: The basic idea is to manage resources on Kubernetes solely by committing changes to Git and approving using pull requests. The term was coined by Alexis Richardson at Weaveworks in a blog post titled ‘ Operations by Pull Request ’. If you already know what GitOps is and don't want to read a long description of each tool, you can jump to the end and just read the Conclusions section! A Quick Intro to GitOps While these other tools do a good job implementing generic pipelines and workflows to build, test, release, and deploy applications, for this evaluation we selected the three tools that implement a GitOps style of application deployments out-of-the-box, based on changes in Git repositories. There is much confusion in the industry right now about which tool to pick and how they relate to generic CI/CD tools like Jenkins, GitLab CI, or GitHub Actions. The tools we are going to examine in this post are FluxCD, ArgoCD and JenkinsX, all of them focused on deployment of applications to Kubernetes clusters. Nothing shows it better than a new generation of deployment tools, which treat GitOps as the main organising principle for Continuous Delivery and Change Management. GitOps-the idea to fully manage applications and infrastructure using a Git-based workflow-is gaining a lot of traction recently.
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