We will have requirements, where customer need to configure multiple projects but they want pods inside those projects to communicate each other. Since each projects will have its own netnamespace, communication will not happen between them by default. We can easily achieve this cross-communication as below.
Check current netnamespace of the projects. You can see different ID’s as below.
# oc get netnamespace | grep myapp myapp-test 750807 myapp-test-db 5402669 myapp-test-data 6503429
Let’s join the projects with join-projects option.
# oadm pod-network join-projects --to=myapp-test-db myapp-test myapp-test-data
Verify the ID’s again; you can see all got the same netnamespace ID as
# oc get netnamespace | grep myapp myapp-test 5402669 myapp-test-db 5402669 myapp-test-data 5402669
You can use isolate-projects option as below, to isolate project network.
# oc adm pod-network isolate-projects <project1> <project2>