kube/argocd

Workflow

Most applications in our Kubernetes cluster are managed by ArgoCD. Most notably operators are NOT managed by ArgoCD.

Adding to applications/: kubectl apply -f newapp.yaml

Deployment

To deploy ArgoCD:

helm repo add argo-cd https://argoproj.github.io/argo-helm
kubectl create secret -n argocd generic argocd-secret # Initialize empty secret for sessions

helm template -n argocd --release-name k6 argo-cd/argo-cd --include-crds -f values.yaml > argocd.yml
kubectl apply -f argocd.yml -f application-extras.yml -f redis.yaml -f monitoring.yml -n argocd
kubectl label -n argocd secret oidc-client-argocd-owner-secrets app.kubernetes.io/part-of=argocd

kubectl -n argocd rollout restart deployment/k6-argocd-redis deployment/k6-argocd-repo-server deployment/k6-argocd-server deployment/k6-argocd-notifications-controller statefulset/k6-argocd-application-controller

Setting up Git secrets

Generate SSH key to access Gitea:

ssh-keygen -t ecdsa -f id_ecdsa -C argocd.k-space.ee -P ''
kubectl -n argocd create secret generic gitea-kube \
  --from-literal=type=git \
  --from-literal=url=git@git.k-space.ee:k-space/kube \
  --from-file=sshPrivateKey=id_ecdsa
kubectl -n argocd create secret generic gitea-kube-staging \
  --from-literal=type=git \
  --from-literal=url=git@git.k-space.ee:k-space/kube-staging \
  --from-file=sshPrivateKey=id_ecdsa
kubectl -n argocd create secret generic gitea-kube-members \
  --from-literal=type=git \
  --from-literal=url=git@git.k-space.ee:k-space/kube-members \
  --from-file=sshPrivateKey=id_ecdsa
kubectl -n argocd create secret generic gitea-members \
  --from-literal=type=git \
  --from-literal=url=git@git.k-space.ee:k-space/kube-members \
  --from-file=sshPrivateKey=id_ecdsa  
kubectl label -n argocd secret gitea-kube argocd.argoproj.io/secret-type=repository
kubectl label -n argocd secret gitea-kube-staging argocd.argoproj.io/secret-type=repository
kubectl label -n argocd secret gitea-kube-members argocd.argoproj.io/secret-type=repository
kubectl label -n argocd secret gitea-members argocd.argoproj.io/secret-type=repository
rm -fv id_ecdsa

Have Gitea admin reset password for user argocd and log in with that account. Add the SSH key for user argocd from file id_ecdsa.pub. Delete any other SSH keys associated with Gitea user argocd.

Managing applications

To update apps:

for j in asterisk bind camtiler etherpad freescout gitea grafana hackerspace nextcloud nyancat rosdump traefik wiki wildduck woodpecker; do
cat << EOF >> applications/$j.yaml
---
apiVersion: argoproj.io/v1alpha1
kind: Application
metadata:
  name: $j
  namespace: argocd
  annotations:
    # Works with only Kustomize and Helm. Kustomize is easy, see https://github.com/argoproj-labs/argocd-image-updater/tree/master/manifests/base for an example.
    argocd-image-updater.argoproj.io/image-list: TODO:^2 # semver 2.*.*
    argocd-image-updater.argoproj.io/write-back-method: git
spec:
  project: k-space.ee
  source:
    repoURL: 'git@git.k-space.ee:k-space/kube.git'
    path: $j
    targetRevision: HEAD
  destination:
    server: 'https://kubernetes.default.svc'
    namespace: $j
  syncPolicy:
    automated:
      prune: true
    syncOptions:
      - CreateNamespace=true
EOF
done
find applications -name "*.yaml" -exec kubectl apply -n argocd -f {} \;