无法缩容Kubernetes集群

Question

我在GCP上有一个Cassandra/Kubernetes集群

manuchadha25@cloudshell:~ (copper-frame-262317)$ kubectl get statefulsets --all-namespaces                                                                                                        
NAMESPACE       NAME                       READY   AGE
cass-operator   cluster1-dc1-default-sts   3/3     2d9h
manuchadha25@cloudshell:~ (copper-frame-262317)$ kubectl get all -n cass-operator                                                                                                                 
NAME                                 READY   STATUS    RESTARTS   AGE
pod/cass-operator-5f8cdf99fc-9c5g4   1/1     Running   0          2d9h
pod/cluster1-dc1-default-sts-0       2/2     Running   0          2d9h
pod/cluster1-dc1-default-sts-1       2/2     Running   0          2d9h
pod/cluster1-dc1-default-sts-2       2/2     Running   0          2d9h

NAME                                          TYPE           CLUSTER-IP      EXTERNAL-IP     PORT(S)             AGE
service/cass-operator-metrics                 ClusterIP      10.51.243.147   <none>          8383/TCP,8686/TCP   2d9h
service/cassandra-loadbalancer                LoadBalancer   10.51.240.24    34.91.214.233   9042:30870/TCP      37h
service/cassandradatacenter-webhook-service   ClusterIP      10.51.243.86    <none>          443/TCP             2d9h
service/cluster1-dc1-all-pods-service         ClusterIP      None            <none>          <none>              2d9h
service/cluster1-dc1-service                  ClusterIP      None            <none>          9042/TCP,8080/TCP   2d9h
service/cluster1-seed-service                 ClusterIP      None            <none>          <none>              2d9h

NAME                            READY   UP-TO-DATE   AVAILABLE   AGE
deployment.apps/cass-operator   1/1     1            1           2d9h

NAME                                       DESIRED   CURRENT   READY   AGE
replicaset.apps/cass-operator-5f8cdf99fc   1         1         1       2d9h

NAME                                        READY   AGE
statefulset.apps/cluster1-dc1-default-sts   3/3     2d9h
manuchadha25@cloudshell:~ (copper-frame-262317)$

我想把它从3个节点缩减到2个节点。我尝试运行以下命令，但都失败了。

manuchadha25@cloudshell:~ (copper-frame-262317)$ kubectl scale statefulsets cluster1-dc1-default-sts --replicas=2
Error from server (NotFound): statefulsets.apps "cluster1-dc1-default-sts" not found

缩容集群的正确命令是什么？

Answer 1

使用-n参数(在本例中为-n cass-operator)在正确的名称空间中执行命令

kubectl scale statefulsets cluster1-dc1-default-sts --replicas=2 -n cass-operator

还可以使用以下命令更改所有后续命令的命名空间

kubectl config set-context --current --namespace=cass-operator

Answer 2

使用-n参数指定部署statfulset的正确namespace。如果没有namespace，它将尝试从不存在statfulset cluster1-dc1-default-sts的default命名空间中删除。

kubectl scale statefulsets cluster1-dc1-default-sts --replicas=2 -n cass-operator