I'm currently working on a kubernetes cluster. Cluster is working properly. I need to establish communication between services without using proxy. For example I have services below:
Worker needs to login to app containers directly via SSH and do some commands. In docker-compose file it was easy by using links and then ssh app1, ssh app2. How to do it in Kubernetes ?
There are pseudocode,
kind: Service
apiVersion: v1
metadata:
name: worker
labels:
app: worker
spec:
selector:
app: worker
ports:
- protocol: TCP
port: 22
targetPort: 22
type: NodePort
---
kind: Service
apiVersion: v1
metadata:
name: app1
labels:
app: app1
spec:
selector:
app: app1
ports:
- protocol: TCP
port: 22
targetPort: 22
type: ClusterIP
---
kind: Service
apiVersion: v1
metadata:
name: app2
labels:
app: app2
spec:
selector:
app: app2
ports:
- protocol: TCP
port: 22
targetPort: 22
type: ClusterIP Then, on worker
ssh app1
ssh app2You'll want to create a headless Service (spec.clusterIP: None) selecting your app Pods. This will create a DNS entry (something like my-svc.my-namespace.svc.cluster.local) that will resolve to the set of IPs of the Pods selected by your Service. You can then loop through the returned list of Pod IPs and ssh into each.
More details can be found here.