For running the examples, the following packages are required:
docker
fluxcd
git
kubectl
kubernetes-helm
minikube
I installed them using nix-shell.
First, the cluster needs to be spun up:
minikube start
After creating a repository on Github (janlikar/hiringhw) we can bootstrap flux:
flux bootstrap git \
--components-extra=image-reflector-controller,image-automation-controller \
--url=ssh://[email protected]/janlikar/hiringhw \
--branch=main \
--private-key-file=/home/jan/.ssh/id_ed25519 \
--path=clusters/production
A helm chart to install Wordpress can be generated using the following commands:
flux create source helm wordpress --url https://charts.bitnami.com/bitnami --export > clusters/production/wordpress-source.yml
flux create hr wordpress --chart wordpress --source HelmRepository/wordpress --export > clusters/production/wordpress.yml
We need to add the following lines to spec in clusters/production/wordpress.yml1:
values:
image:
tag: 6.4.2
service:
type: NodePort
Then we can commit & push the generated files:
git add clusters/production/wordpress-source.yml clusters/production/wordpress.yml && git commit -m "Add wordpress"
flux create image repository wordpress --image bitnami/wordpress --export > clusters/production/wordpress-repository.yml
flux create image policy wordpress --image-ref=wordpress --select-semver=6.4.x --export > ./clusters/production/wordpress-policy.yaml
Add the # {"$imagepolicy": "flux-system:wordpress"} comment next to a tag specifier in clusters/production/wordpress-repository.yml.
Finally, we generate an ImageUpdateAutomation and push it to our git repo:
flux create image update flux-system \
--interval=30m \
--git-repo-ref=flux-system \
--git-repo-path="./clusters/production" \
--checkout-branch=main \
--push-branch=main \
--author-name=fluxcdbot \
[email protected] \
--commit-template="{{range .Updated.Images}}{{println .}}{{end}}" \
--export > ./clusters/production/flux-system-automation.yaml
git add clusters/production/flux-system-automation.yaml
git commit -m "Enable image automation"
git push
Footnotes
-
In real world applications we would probabaly use a LoadBalancer, not NodePort, for
service.type. ↩
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