Getting Started with ArgoCD - GitOps
Argo CD is a declarative, GitOps continuous delivery tool for Kubernetes.
In this post, let us install ArgoCD in a minikube Kubernetes cluster and explore its user interface.
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For more info check out https://learning.codefresh.io/ .
First let us spin a new cluster using minikube.
(base) pradeep:~$minikube start
😄 minikube v1.25.2 on Darwin 12.4
🎉 minikube 1.26.1 is available! Download it: https://github.com/kubernetes/minikube/releases/tag/v1.26.1
💡 To disable this notice, run: 'minikube config set WantUpdateNotification false'
✨ Automatically selected the hyperkit driver. Other choices: virtualbox, ssh
👍 Starting control plane node minikube in cluster minikube
🔥 Creating hyperkit VM (CPUs=2, Memory=2200MB, Disk=20000MB) ...
🐳 Preparing Kubernetes v1.23.3 on Docker 20.10.12 ...
▪ kubelet.housekeeping-interval=5m
▪ Generating certificates and keys ...
▪ Booting up control plane ...
▪ Configuring RBAC rules ...
🔎 Verifying Kubernetes components...
▪ Using image gcr.io/k8s-minikube/storage-provisioner:v5
🌟 Enabled addons: default-storageclass, storage-provisioner
🏄 Done! kubectl is now configured to use "minikube" cluster and "default" namespace by default
(base) pradeep:~$
Create a new namespace for ArgoCD.
(base) pradeep:~$kubectl create namespace argocd
namespace/argocd created
(base) pradeep:~$
Create all ArgoCD resources using the manifest file.
(base) pradeep:~$kubectl apply -n argocd -f https://raw.githubusercontent.com/codefresh-contrib/gitops-certification-examples/main/argocd-noauth/install.yaml
customresourcedefinition.apiextensions.k8s.io/applications.argoproj.io created
customresourcedefinition.apiextensions.k8s.io/appprojects.argoproj.io created
serviceaccount/argocd-application-controller created
serviceaccount/argocd-dex-server created
serviceaccount/argocd-redis created
serviceaccount/argocd-server created
role.rbac.authorization.k8s.io/argocd-application-controller created
role.rbac.authorization.k8s.io/argocd-dex-server created
role.rbac.authorization.k8s.io/argocd-server created
clusterrole.rbac.authorization.k8s.io/argocd-application-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-dex-server 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-server created
configmap/argocd-cm created
configmap/argocd-cmd-params-cm created
configmap/argocd-gpg-keys-cm created
configmap/argocd-rbac-cm created
configmap/argocd-ssh-known-hosts-cm created
configmap/argocd-tls-certs-cm created
secret/argocd-secret created
service/argocd-dex-server created
service/argocd-metrics created
service/argocd-redis created
service/argocd-repo-server created
service/argocd-server created
service/argocd-server-metrics created
deployment.apps/argocd-dex-server 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-dex-server-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
(base) pradeep:~$
Verify the resources created
(base) pradeep:~$kubectl get all -n argocd
NAME READY STATUS RESTARTS AGE
pod/argocd-application-controller-0 0/1 ContainerCreating 0 114s
pod/argocd-dex-server-6bcd85b666-m7qjl 0/1 Init:0/1 0 114s
pod/argocd-redis-84558bbb99-bhd4d 1/1 Running 0 114s
pod/argocd-repo-server-6dc7b6f6b9-l6kl7 0/1 ContainerCreating 0 114s
pod/argocd-server-6fcf5d68db-c6lg2 0/1 ContainerCreating 0 114s
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
service/argocd-dex-server ClusterIP 10.105.157.71 <none> 5556/TCP,5557/TCP,5558/TCP 114s
service/argocd-metrics ClusterIP 10.98.118.244 <none> 8082/TCP 114s
service/argocd-redis ClusterIP 10.108.73.63 <none> 6379/TCP 114s
service/argocd-repo-server ClusterIP 10.102.43.4 <none> 8081/TCP,8084/TCP 114s
service/argocd-server ClusterIP 10.96.199.251 <none> 80/TCP,443/TCP 114s
service/argocd-server-metrics ClusterIP 10.97.45.79 <none> 8083/TCP 114s
NAME READY UP-TO-DATE AVAILABLE AGE
deployment.apps/argocd-dex-server 0/1 1 0 114s
deployment.apps/argocd-redis 1/1 1 1 114s
deployment.apps/argocd-repo-server 0/1 1 0 114s
deployment.apps/argocd-server 0/1 1 0 114s
NAME DESIRED CURRENT READY AGE
replicaset.apps/argocd-dex-server-6bcd85b666 1 1 0 114s
replicaset.apps/argocd-redis-84558bbb99 1 1 1 114s
replicaset.apps/argocd-repo-server-6dc7b6f6b9 1 1 0 114s
replicaset.apps/argocd-server-6fcf5d68db 1 1 0 114s
NAME READY AGE
statefulset.apps/argocd-application-controller 0/1 114s
(base) pradeep:~$
Expose the ArgoCD UI using a NodePort Service.
(base) pradeep:~$cat argocd-ui-service.yaml
apiVersion: v1
kind: Service
metadata:
labels:
app: argocd-server
managedFields:
name: argocd-server-nodeport
namespace: argocd
spec:
ports:
- nodePort: 30443
port: 8080
protocol: TCP
selector:
app.kubernetes.io/name: argocd-server
type: NodePort
(base) pradeep:~$
(base) pradeep:~$kubectl apply -f argocd-ui-service.yaml
service/argocd-server-nodeport created
(base) pradeep:~$
(base) pradeep:~$kubectl get service -n argocd
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
argocd-dex-server ClusterIP 10.105.157.71 <none> 5556/TCP,5557/TCP,5558/TCP 5m44s
argocd-metrics ClusterIP 10.98.118.244 <none> 8082/TCP 5m44s
argocd-redis ClusterIP 10.108.73.63 <none> 6379/TCP 5m44s
argocd-repo-server ClusterIP 10.102.43.4 <none> 8081/TCP,8084/TCP 5m44s
argocd-server ClusterIP 10.96.199.251 <none> 80/TCP,443/TCP 5m44s
argocd-server-metrics ClusterIP 10.97.45.79 <none> 8083/TCP 5m44s
argocd-server-nodeport NodePort 10.102.152.203 <none> 8080:30443/TCP 30s
(base) pradeep:~$minikube ip
172.16.30.11
(base) pradeep:~$
Lets open a web browser and open the url 172.16.30.11:30443
(base) pradeep:~$kubectl -n argocd get secret argocd-initial-admin-secret -o jsonpath="{.data.password}" | base64 -d > admin-pass.txt
(base) pradeep:~$cat admin-pass.txt
HnHrq5degJR3l4PX% (base) pradeep:~$
(base) pradeep:~$curl -sSL -o /usr/local/bin/argocd https://github.com/argoproj/argo-cd/releases/download/v2.1.5/argocd-linux-amd64
(base) pradeep:~$
(base) pradeep:~$chmod +x /usr/local/bin/argocd
(base) pradeep:~$
(base) pradeep:~$kubectl get pods
NAME READY STATUS RESTARTS AGE
simple-deployment-848675b7d-h2h8n 1/1 Running 0 2m36s
(base) pradeep:~$kubectl describe pods
Name: simple-deployment-848675b7d-h2h8n
Namespace: default
Priority: 0
Node: minikube/172.16.30.11
Start Time: Sun, 28 Aug 2022 16:30:59 +0530
Labels: app=trivial-go-web-app
pod-template-hash=848675b7d
Annotations: <none>
Status: Running
IP: 172.17.0.8
IPs:
IP: 172.17.0.8
Controlled By: ReplicaSet/simple-deployment-848675b7d
Containers:
webserver-simple:
Container ID: docker://a80e8922e574b1b7860d0ee8f8d05af66158ecf231f8327b2564a939ec25ca02
Image: docker.io/kostiscodefresh/gitops-simple-app:v1.0
Image ID: docker-pullable://kostiscodefresh/gitops-simple-app@sha256:babc3a814fb27ddf736e34d6f20bde9d3d9191d4bc13e760d624f2143abde646
Port: 8080/TCP
Host Port: 0/TCP
State: Running
Started: Sun, 28 Aug 2022 16:31:09 +0530
Ready: True
Restart Count: 0
Environment: <none>
Mounts:
/var/run/secrets/kubernetes.io/serviceaccount from kube-api-access-tn8cq (ro)
Conditions:
Type Status
Initialized True
Ready True
ContainersReady True
PodScheduled True
Volumes:
kube-api-access-tn8cq:
Type: Projected (a volume that contains injected data from multiple sources)
TokenExpirationSeconds: 3607
ConfigMapName: kube-root-ca.crt
ConfigMapOptional: <nil>
DownwardAPI: true
QoS Class: BestEffort
Node-Selectors: <none>
Tolerations: node.kubernetes.io/not-ready:NoExecute op=Exists for 300s
node.kubernetes.io/unreachable:NoExecute op=Exists for 300s
Events:
Type Reason Age From Message
---- ------ ---- ---- -------
Normal Scheduled 2m44s default-scheduler Successfully assigned default/simple-deployment-848675b7d-h2h8n to minikube
Normal Pulling 2m42s kubelet Pulling image "docker.io/kostiscodefresh/gitops-simple-app:v1.0"
Normal Pulled 2m34s kubelet Successfully pulled image "docker.io/kostiscodefresh/gitops-simple-app:v1.0" in 7.494980849s
Normal Created 2m34s kubelet Created container webserver-simple
Normal Started 2m34s kubelet Started container webserver-simple
(base) pradeep:~$
(base) pradeep:~$kubectl get svc
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
kubernetes ClusterIP 10.96.0.1 <none> 443/TCP 29m
simple-service NodePort 10.104.91.157 <none> 8080:31000/TCP 3m37s
(base) pradeep:~$
