app-of-apps example

All files in infra repo

GitHub - argoproj/argocd-example-apps: Example Apps to Demonstrate Argo CDGitHub

Instructions for this example are HERE

In order to start app in Argo-CD you need to login:

// get password
kubectl -n argocd get secret argocd-initial-admin-secret \
-o jsonpath="{.data.password}" | base64 -d; echo

// get hostname (does not work)
kubectl get service argocd-server -n argocd --output=jsonpath='{.status.loadBalancer.ingress[0].hostname}'
// for now as a shortcut just forward ports of the server
kubectl port-forward svc/argocd-server -n argocd 8081:https

// login to Argo-CD
argocd login localhost:8081 \
--username admin \
--password $(kubectl -n argocd get secret argocd-initial-admin-secret -o jsonpath="{.data.password}" | base64 -d; echo) \
--insecure

// start apps (assuming the correct github repo link with examples)
argocd app create apps \
    --dest-namespace argocd \
    --dest-server https://kubernetes.default.svc \
    --repo https://github.com/argoproj/argocd-example-apps.git \
    --path apps  
    
// sync apps
argocd app sync apps  

Root app in this example has quite some scripting in its helm chart template in order to render it locally execute the following

cd to_apps_folder
helm template . --values values.yaml

Pros:

• you may have reusable code among helm charts

• everything is in one place

Cons

• Harder to enforce per-app permissions

• Changes to any app trigger syncs for the whole repo

If you are targeting a experimental setup, small team, PoC then you all in one repo approach.

If you are targeting production ready setup then ues separate approach (ArgoCD related stuff in one repo, but app related k8s manifests in a dedicated application repos).

👀 HERE is an example how to configure a hook from Github to ArgoCD to notify promptly about changes

In this particular example if you want to check what was deployed, e.g. guestbook, then (of course this is a long and non convenient way, but just to make things done this approach works):

// check what was deployed in particular namespace (as in this example each app
// is deployed in its own namespace)
kubectl get pods -n guestbook

// and then port forward particular service
kubectl port-forward svc/guestbook-ui -n guestbook 8084:80

// check it
localhost:8084