Install nexus in openshift

nexus-installation.md

Install Nexus repository on openshift cluster.

1. Create a new namespace 'nexus' in your cluster.

oc new-project nexus

2. Create a new PersistentVolumeClaim

kind: PersistentVolumeClaim
apiVersion: v1
metadata:
  name: nexus-data
  namespace: nexus
spec:
  accessModes:
    - ReadWriteOnce
  resources:
    requests:
      storage: 10Gi

3. Create a new deployment called nexus which exposes two ports 8081 and 8082

apiVersion: apps/v1
kind: Deployment
metadata:
  name: nexus
  namespace: nexus
spec:
  replicas: 1
  selector:
    matchLabels:
      app: nexus
  template:
    metadata:
      labels:
        app: nexus
    spec:
      containers:
      - name: nexus
        image: sonatype/nexus3
        ports:
        - containerPort: 8081
        - containerPort: 8082
        volumeMounts:
        - mountPath: /nexus-data
          name: nexus-data
      volumes:
      - name: nexus-data
        persistentVolumeClaim:
          claimName: nexus-data

4. Create a service for the nexus deployment

apiVersion: v1
kind: Service
metadata:
  name: nexus
  namespace: nexus
spec:
  ports:
  - port: 8081
    name: nexus-web
  - port: 8082
    name: nexus-repo
  selector:
    app: nexus
  type: LoadBalancer

5. expose the service targetting different ports.

oc expose svc/nexus --name=nexus-web --port=nexus-web --namespace=nexus
oc expose svc/nexus --name=nexus-repo --port=nexus-repo --namespace=nexus

6. Go to the Administrator -> Networking -> routes section in openshift and open the nexus-web ui link.

7. Click on the Sign In button from the top right corner.

username: admin
password: xxx // This can be found in the /nexus-data/admin-password file in the nexus pod.

8. Change the admin password and click next to finish the intial setup.

9. Now click on Settings -> repository -> Create repository and choose docker (hosted) repository.

10. Provide the port number 8082 and enable the docker v1 api and click on save at the bottom of the file.

11. Go to the realms on the left navigation bar and click on Docker bearer token and save the settings.

12. Now you should be able to login to the docker repo

podman login -u admin http://nexus-repo-nexus.<cluster-host-name> --tls-verify=false
Password:xxx
Login Succeeded!

13. Tag and push an image to the nexus docker repo

❯ podman pull hello:latest

❯ podman tag 5dd467fce50b nexus-repo-nexus.apps.cluster-s274l.sandbox2448.opentlc.com/sample/hello

❯ podman push nexus-repo-nexus.apps.cluster-s274l.sandbox2448.opentlc.com/sample/hello:latest --tls-verify=false

Now the image will be available on the nexus repo.

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