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K8s EndpointSlice demo (with custom controller case)
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[centos@kube-master ~]$ cat svc-nginx-k8s.yml | |
--- | |
kind: Service | |
apiVersion: v1 | |
metadata: | |
name: k8s-nginx | |
labels: | |
endpointslice-controller.k8s.io: multus | |
spec: | |
selector: | |
app: k8s-nginx | |
ports: | |
- protocol: TCP | |
port: 80 | |
--- | |
apiVersion: apps/v1 | |
kind: Deployment | |
metadata: | |
name: k8s-nginx | |
spec: | |
selector: | |
matchLabels: | |
app: k8s-nginx | |
replicas: 1 | |
template: | |
metadata: | |
labels: | |
app: k8s-nginx | |
spec: | |
containers: | |
- name: k8s-nginx | |
image: nginx | |
ports: | |
- containerPort: 80 | |
imagePullPolicy: IfNotPresent | |
[centos@kube-master ~]$ kubectl create -f svc-nginx-k8s.yml | |
service/k8s-nginx created | |
deployment.apps/k8s-nginx created | |
[centos@kube-master ~]$ kubectl get svc | |
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE | |
k8s-nginx ClusterIP 10.104.101.10 <none> 80/TCP 10s | |
kubernetes ClusterIP 10.96.0.1 <none> 443/TCP 39h | |
[centos@kube-master ~]$ kubectl get endpointslices.discovery.k8s.io --show-labels | |
NAME ADDRESSTYPE PORTS ENDPOINTS AGE LABELS | |
k8s-nginx-7lrfc IPv4 80 10.244.1.9 16s endpointslice.kubernetes.io/managed-by=endpointslice-controller.k8s.io,kubernetes.io/service-name=k8s-nginx | |
kubernetes IPv4 6443 192.168.122.76 39h kubernetes.io/service-name=kubernetes | |
### Change the endpointslice labels ('endpointslice.kubernetes.io/managed-by': 'endpointslice-controller.k8s.io' -> 'customcontroller-1') | |
[centos@kube-master ~]$ kubectl patch endpointslices.discovery.k8s.io/k8s-nginx-7lrfc -p '{"metadata": {"labels": { "endpointslice.kubernetes.io/managed-by": "customcontroller-1" }}}' | |
endpointslice.discovery.k8s.io/k8s-nginx-7lrfc patched | |
[centos@kube-master ~]$ kubectl get endpointslices.discovery.k8s.io --show-labels | |
NAME ADDRESSTYPE PORTS ENDPOINTS AGE LABELS | |
k8s-nginx-7lrfc IPv4 80 10.244.1.9 41s endpointslice.kubernetes.io/managed-by=customcontroller-1,kubernetes.io/service-name=k8s-nginx | |
kubernetes IPv4 6443 192.168.122.76 39h kubernetes.io/service-name=kubernetes | |
[centos@kube-master ~]$ kubectl scale --replicas=3 deploy/k8s-nginx | |
deployment.apps/k8s-nginx scaled | |
### After scale, k8s endpointslice controller creates new endpointslice because k8s endpointslice controller ignores previous by label change. | |
[centos@kube-master ~]$ kubectl get endpointslices.discovery.k8s.io --show-labels | |
NAME ADDRESSTYPE PORTS ENDPOINTS AGE LABELS | |
k8s-nginx-7lrfc IPv4 80 10.244.1.9 54s endpointslice.kubernetes.io/managed-by=customcontroller-1,kubernetes.io/service-name=k8s-nginx | |
k8s-nginx-9fg6w IPv4 80 10.244.1.9,10.244.2.11,10.244.1.10 6s endpointslice.kubernetes.io/managed-by=endpointslice-controller.k8s.io,kubernetes.io/service-name=k8s-nginx | |
kubernetes IPv4 6443 192.168.122.76 39h kubernetes.io/service-name=kubernetes | |
[centos@kube-master ~]$ |
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