Harry Tang

How to bootstrap FluxCD for Azure DevOps

FluxCD DevOps
FluxCD DevOps

Introduction

FluxCD is a continuous delivery (CD) tool designed for Kubernetes. It automates application deployment within Kubernetes clusters by monitoring version-controlled configuration files. In this article, I will show you how to set up and install FluxCD for your Azure DevOps Services.

Prerequisites

  • Access to a k8s cluster.
  • Flux CLI installed.
  • Basic knowledge of kubernetes.

Step-by-step Guide

  1. Create the DevOps repo with the following files:

    mkdir -p clusters/my-cluster/flux-system
touch clusters/my-cluster/flux-system/gotk-components.yaml
touch clusters/my-cluster/flux-system/gotk-sync.yaml \
touch clusters/my-cluster/flux-system/kustomization.yaml

  2. Update the kustomization.yaml file with the following content:

    apiVersion: kustomize.config.k8s.io/v1beta1
kind: Kustomization
resources:
  - gotk-components.yaml
  - gotk-sync.yaml
patches:
  - patch: |
      - op: add
        path: /spec/template/spec/containers/0/args/-
        value: --ssh-hostkey-algos=rsa-sha2-512,rsa-sha2-256
    target:
      kind: Deployment
      name: (source-controller|image-automation-controller)

  3. Commit and push the changes:

    git add -A && git commit -m "feat: init flux" && git push

  4. Next, generate an SSH key pair that is compatible with Azure DevOps:

    ssh-keygen -t rsa-sha2-512

  5. Upload the SSH public key to Azure DevOps.

  6. Finally, bootstrap the FluxCD:

    flux bootstrap git \
  --components-extra=image-reflector-controller,image-automation-controller \
  --url=ssh://[email protected]/v3/<org>/<project>/<repository> \
  --branch=<your-branch> \
  --ssh-hostkey-algos=rsa-sha2-512,rsa-sha2-256 \
  --private-key-file=<path/to/your/ssh/private.key> \
  --password=<key-passphrase-if-any> \
  --path=./clusters/my-cluster

Conclusion

Now that FluxCD has been bootstrapped for your DevOps, you can commit your applications (yaml files) to /clusters/my-cluster, and FluxCD will deploy them to your K8s cluster automatically.

References

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