CODEWITHSUNDEEP
kuberneteskubectl
Abdelghani
Abdelghani

Reputation: 745

Kubernetes : How to change service ports using patch

Let be the following service :

serivce1.yml
apiVersion: v1
kind: Service
metadata:
  name: service1
spec:
  type: ClusterIP
  ports:
   - port: 90
     name: port0
     targetPort: 40000
  selector:
    app: nginx

I apply as follow : kubectl apply -f service1.yml

Now I want to change the ports section. I could edit the yml and apply again but I prefere to use patch :

kubectl patch service service1 -p '{"spec":{"ports": [{"port": 80,"name":"anotherportspec"}]}}'
service/service1 patched

but this command adds a new port and keeps the old one :

$ kubectl describe svc service1
Name:              service1
Namespace:         abdelghani
Labels:            <none>
Annotations:       <none>
Selector:          app=nginx
Type:              ClusterIP
IP Families:       <none>
IP:                10.98.186.21
IPs:               <none>
Port:              anotherportspec  80/TCP
TargetPort:        80/TCP
Endpoints:         10.39.0.3:80
Port:              port0  90/TCP
TargetPort:        40000/TCP
Endpoints:         10.39.0.3:40000
Session Affinity:  None
Events:            <none>

My question: Is it possible to change the ports sections by replacing the old section with the one passed as parameter?

Thx

Upvotes: 1

Views: 7409

Answers (2)

user3008410
user3008410

Reputation: 848

Just an FYI, when all else fails and you just need to get it done sed, awk, perl can help. here is an example of changing a service from ClusterIP to NodePort and using a specific port.

kubectl get service/kubernetes-dashboard -n kubernetes-dashboard -o yaml | sed -E "s/(targetPort:\s[0-9]{0,5})/\1\n\ \ \ \ nodePort: 32323/" | sed 's/type: ClusterIP/type: NodePort/' | kubectl replace -f -

*Please remember to make a quick backup first.

Upvotes: 2

Malgorzata
Malgorzata

Reputation: 7023

As we've (with @Abdelghani) discussed the problem is in patch strategy. Using following command:

$ kubectl patch svc service1 --type merge -p '{"spec":{"ports": [{"port": 80,"name":"anotherportspec"}]}}' solves the problem.

Flag --type merge will enable replace the existing values.

Read more: kubectl-patch.

As an alternative for patching you have couple options:

1. Edit your service using kubectl edit command: In prompt $ kubectl edit svc <service_name> -n <namespace>

i - to edit the service

ESC, :wq - update your service

Paste proper port and save file.

2. You can also manually edit service conf file:

vi your-service.yaml

update port number and apply changes

$ kubectl apply -f your-service.yaml

Upvotes: 6

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