Sunday, December 8, 2024

Argo CD - k8s GitOps on minikube

HOWTO 

Git


Argo CD architecture






 Start minikube

dave@fedora:~$ minikube start --driver=docker
😄  minikube v1.32.0 on Fedora 40
✨  Using the docker driver based on existing profile
👍  Starting control plane node minikube in cluster minikube
🚜  Pulling base image ...
🎉  minikube 1.34.0 is available! Download it: https://github.com/kubernetes/minikube/releases/tag/v1.34.0
💡  To disable this notice, run: 'minikube config set WantUpdateNotification false'

🔄  Restarting existing docker container for "minikube" ...
🐳  Preparing Kubernetes v1.28.3 on Docker 24.0.7 ...
🔗  Configuring bridge CNI (Container Networking Interface) ...
🔎  Verifying Kubernetes components...
    ▪ Using image gcr.io/k8s-minikube/minikube-ingress-dns:0.0.2
    ▪ Using image docker.io/kubernetesui/metrics-scraper:v1.0.8
    ▪ Using image docker.io/kubernetesui/dashboard:v2.7.0
    ▪ Using image registry.k8s.io/ingress-nginx/kube-webhook-certgen:v20231011-8b53cabe0
    ▪ Using image gcr.io/k8s-minikube/storage-provisioner:v5
    ▪ Using image registry.k8s.io/ingress-nginx/kube-webhook-certgen:v20231011-8b53cabe0
    ▪ Using image registry.k8s.io/ingress-nginx/controller:v1.9.4
🔎  Verifying ingress addon...
💡  Some dashboard features require the metrics-server addon. To enable all features please run:

    minikube addons enable metrics-server    


🌟  Enabled addons: ingress-dns, storage-provisioner, dashboard, ingress, default-storageclass
🏄  Done! kubectl is now configured to use "minikube" cluster and "default" namespace by default

 

 

Install Argo CD 


dave@fedora:~$ kubectl create namespace argocd
namespace/argocd created
dave@fedora:~$ kubectl apply -n argocd -f https://raw.githubusercontent.com/argoproj/argo-cd/stable/manifests/install.yaml
customresourcedefinition.apiextensions.k8s.io/applications.argoproj.io created
customresourcedefinition.apiextensions.k8s.io/applicationsets.argoproj.io created
customresourcedefinition.apiextensions.k8s.io/appprojects.argoproj.io created
serviceaccount/argocd-application-controller created
serviceaccount/argocd-applicationset-controller created
serviceaccount/argocd-dex-server created
serviceaccount/argocd-notifications-controller created
serviceaccount/argocd-redis created
serviceaccount/argocd-repo-server created
serviceaccount/argocd-server created
role.rbac.authorization.k8s.io/argocd-application-controller created
role.rbac.authorization.k8s.io/argocd-applicationset-controller created
role.rbac.authorization.k8s.io/argocd-dex-server created
role.rbac.authorization.k8s.io/argocd-notifications-controller created
role.rbac.authorization.k8s.io/argocd-redis created
role.rbac.authorization.k8s.io/argocd-server created
clusterrole.rbac.authorization.k8s.io/argocd-application-controller created
clusterrole.rbac.authorization.k8s.io/argocd-applicationset-controller created
clusterrole.rbac.authorization.k8s.io/argocd-server created
rolebinding.rbac.authorization.k8s.io/argocd-application-controller created
rolebinding.rbac.authorization.k8s.io/argocd-applicationset-controller created
rolebinding.rbac.authorization.k8s.io/argocd-dex-server created
rolebinding.rbac.authorization.k8s.io/argocd-notifications-controller created
rolebinding.rbac.authorization.k8s.io/argocd-redis created
rolebinding.rbac.authorization.k8s.io/argocd-server created
clusterrolebinding.rbac.authorization.k8s.io/argocd-application-controller created
clusterrolebinding.rbac.authorization.k8s.io/argocd-applicationset-controller created
clusterrolebinding.rbac.authorization.k8s.io/argocd-server created
configmap/argocd-cm created
configmap/argocd-cmd-params-cm created
configmap/argocd-gpg-keys-cm created
configmap/argocd-notifications-cm created
configmap/argocd-rbac-cm created
configmap/argocd-ssh-known-hosts-cm created
configmap/argocd-tls-certs-cm created
secret/argocd-notifications-secret created
secret/argocd-secret created
service/argocd-applicationset-controller created
service/argocd-dex-server created
service/argocd-metrics created
service/argocd-notifications-controller-metrics created
service/argocd-redis created
service/argocd-repo-server created
service/argocd-server created
service/argocd-server-metrics created
deployment.apps/argocd-applicationset-controller created
deployment.apps/argocd-dex-server created
deployment.apps/argocd-notifications-controller created
deployment.apps/argocd-redis created
deployment.apps/argocd-repo-server created
deployment.apps/argocd-server created
statefulset.apps/argocd-application-controller created
networkpolicy.networking.k8s.io/argocd-application-controller-network-policy created
networkpolicy.networking.k8s.io/argocd-applicationset-controller-network-policy created
networkpolicy.networking.k8s.io/argocd-dex-server-network-policy created
networkpolicy.networking.k8s.io/argocd-notifications-controller-network-policy created
networkpolicy.networking.k8s.io/argocd-redis-network-policy created
networkpolicy.networking.k8s.io/argocd-repo-server-network-policy created
networkpolicy.networking.k8s.io/argocd-server-network-policy created

 Get pods in argocd namespace

$ kubectl get pod -n argocd
NAME                                                READY   STATUS              RESTARTS   AGE
argocd-application-controller-0                     0/1     ContainerCreating   0          20s
argocd-applicationset-controller-5c787df94f-npjn9   0/1     ContainerCreating   0          22s
argocd-dex-server-6bb9b5fc75-x4vt8                  0/1     Init:0/1            0          22s
argocd-notifications-controller-7ccbd7fb6-dm8bq     0/1     ContainerCreating   0          22s
argocd-redis-c5c567495-cgtrl                        0/1     Init:0/1            0          22s
argocd-repo-server-799b498d8b-pc2l8                 0/1     Init:0/1            0          22s
argocd-server-f6d4d8775-9hlcj                       0/1     ContainerCreating   0          21s

Get services in argocd namespace
$ kubectl get svc -n argocd
NAME                                      TYPE        CLUSTER-IP      EXTERNAL-IP   PORT(S)                      AGE
argocd-applicationset-controller          ClusterIP   10.101.144.51   <none>        7000/TCP,8080/TCP            105s
argocd-dex-server                         ClusterIP   10.111.165.14   <none>        5556/TCP,5557/TCP,5558/TCP   105s
argocd-metrics                            ClusterIP   10.100.56.238   <none>        8082/TCP                     105s
argocd-notifications-controller-metrics   ClusterIP   10.111.151.85   <none>        9001/TCP                     105s
argocd-redis                              ClusterIP   10.97.35.44     <none>        6379/TCP                     104s
argocd-repo-server                        ClusterIP   10.109.34.145   <none>        8081/TCP,8084/TCP            104s
argocd-server                             ClusterIP   10.99.111.141   <none>        80/TCP,443/TCP               104s
argocd-server-metrics                     ClusterIP   10.106.186.75   <none>        8083/TCP                     104s

Port forward to access Argo CD UI
$ kubectl port-forward svc/argocd-server -n argocd 8080:443
Forwarding from 127.0.0.1:8080 -> 8080
Forwarding from [::1]:8080 -> 8080

Get admin password
$ kubectl get secret argocd-initial-admin-secret -n argocd -o yaml
apiVersion: v1
data:
  password: ab123==
kind: Secret
metadata:
  creationTimestamp: "2024-12-15T07:58:19Z"
  name: argocd-initial-admin-secret
  namespace: argocd
  resourceVersion: "190652"
  uid: a017dc3e-3232-40f6-a2e6-374872963888
type: Opaque

$ echo ab123|base64 --decode

Open UI at https://127.0.0.1:8080/applications





Apply application.yaml on k8s cluster via kubectl

apiVersion: argoproj.io/v1alpha1
kind: Application
metadata:
  name: guestbook
  namespace: argocd
spec:
  project: default

  source:
    repoURL: https://github.com/dveselka/devops-k8s.git
    targetRevision: HEAD
    path: argocd
    
  destination:
    server: https://kubernetes.default.svc
    namespace: myapp

  syncPolicy:
    syncOptions:
    - CreateNamespace = true  


    automated:
      selfHeal: true
      prune: true

Apply

$ cp * /git/devops-k8s/argocd
dave@dave:/git/argocd-app-config/dev$ ls
application.yaml  deployment.yaml  service.yaml
dave@dave:/git/argocd-app-config/dev$ kubectl apply -f application.yaml 
application.argoproj.io/guestbook created

Argo CD UI - unsynced


Argo CD UI with synced application 





Argo CD descriptors






Get pods in myapp namespace
$  kubectl get pods -n myapp
NAME                     READY   STATUS    RESTARTS   AGE
myapp-55c645d9b5-62llh   1/1     Running   0          6m29s
myapp-55c645d9b5-vmtmb   1/1     Running   0          6m29s

Get services in myapp namespace
$  kubectl get svc  -n myapp
NAME            TYPE        CLUSTER-IP       EXTERNAL-IP   PORT(S)    AGE
myapp-service   ClusterIP   10.104.101.233   <none>        8080/TCP   6m35s

Minikube dashboard



Deployments 







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