How to Label a Namespace in Openshift or Kubernetes

Image : joc.com

Labeling an object in OpenShift or Kubernetes is an awesome method to organize, group, or select API objects. Labels can be used to group arbitrarily-related objects; for example, all of the object like pods, services, replication controllers, routes and deployment configurations of a particular application can be grouped with a single or multiple labels.

Here see the quick way add label to a namespace or project. We have below awesomeproject with no labels set.

[root@ocp-master01 home]# oc describe project awesomeproject
 Name:           awesomeproject
 Created:        3 months ago
 
Labels:         
 Annotations:    openshift.io/description=
                 openshift.io/display-name=
                 openshift.io/node-selector=project=production
                 openshift.io/requester=system:admin
                 openshift.io/sa.scc.mcs=s0:c18,c12
                 openshift.io/sa.scc.supplemental-groups=1000330000/10000
                 openshift.io/sa.scc.uid-range=1000330000/10000
 Display Name:   
 Description:    
 Status:         Active
 Node Selector:  project=production
 Quota:
                         Name:           compute-resources
                         Resource        Used    Hard
                         --------        ----    ----
                         limits.cpu      0       4
                         limits.memory   0       8Gi
                         requests.cpu    0       2
                         requests.memory 0       4Gi
 Resource limits:

Now we will add a label using oc label command as show below.

[root@ocp-master01 home]# oc label namespace awesomeproject router2=intra-router2
 namespace/awesomeproject labeled

DO NOT use oc label project , please see Red Hat thread here .

Now check the project details, you can see a label added already.

[root@ocp-master01 home]# oc describe project awesomeproject
 Name:           awesomeproject
 Created:        3 months ago
 Labels:         router2=intra-router2
 Annotations:    openshift.io/description=
                 openshift.io/display-name=
                 openshift.io/node-selector=project=production
                 openshift.io/requester=system:admin
                 openshift.io/sa.scc.mcs=s0:c18,c12
                 openshift.io/sa.scc.supplemental-groups=1000330000/10000
                 openshift.io/sa.scc.uid-range=1000330000/10000
 Display Name:   
 Description:    
 Status:         Active
 Node Selector:  project=production
<truncated output...>

To test again, we will add another label.

root@ocp-master01 home]# oc label namespace awesomeproject router3=intra-router3
 namespace/awesomeproject labeled

And check details.

[root@ocp-master01 home]# oc describe project awesomeproject
 Name:           awesomeproject
 Created:        3 months ago
 Labels:         router2=intra-router2
                 router3=intra-router3
 Annotations:    openshift.io/description=
                 openshift.io/display-name=
                 openshift.io/node-selector=project=production
                 openshift.io/requester=system:admin
                 openshift.io/sa.scc.mcs=s0:c18,c12
                 openshift.io/sa.scc.supplemental-groups=1000330000/10000
                 openshift.io/sa.scc.uid-range=1000330000/10000
 Display Name:   
 Description:    
 Status:         Active
 Node Selector:  project=production
 <truncated output...>

That’s all.

Aneesh Mohan

System Engineer- Paas(Openshift) at T-Systems Malaysia |RHCE|Ansible|Openshift

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