摘要：
kubectlgetcs[root@master~]#kubectlgetcsWarning:v1ComponentStatusisdeprecatedinv1.19+NAMESTATUSMESSAGEERRORschedulerHealthyokcontroller-managerHealthyoketcd-0Healthy{"health":"true"}kubectlgetdeploymen
kubectl get cs
[root@master ~]# kubectl get cs
Warning: v1 ComponentStatus is deprecated in v1.19+
NAME STATUS MESSAGE ERROR
scheduler Healthy ok
controller-manager Healthy ok
etcd-0 Healthy {"health":"true"}
kubectl get deploymen
kubectl get pods --all-namespaces
[root@master ~]# kubectl get pods --all-namespaces
NAMESPACE NAME READY STATUS RESTARTS AGE
kube-system coredns-f9fd979d6-8bqmr 0/1 Pending 0 75m
kube-system coredns-f9fd979d6-9hgs9 0/1 Pending 0 75m
kube-system etcd-master 1/1 Running 3 75m
kube-system kube-apiserver-master 1/1 Running 3 75m
kube-system kube-controller-manager-master 1/1 Running 0 30m
kube-system kube-proxy-7k5wr 1/1 Running 0 75m
kube-system kube-proxy-9m8jq 1/1 Running 0 72m
kube-system kube-proxy-bjhk9 1/1 Running 2 75m
kube-system kube-scheduler-master 1/1 Running 0 31m
ns-elastic elasticsearch-data-0 0/1 Pending 0 65m
ns-elastic elasticsearch-master-0 0/1 Pending 0 65m
kubectl delete pods elasticsearch-data-0
kubectl get namespace kube-system -o yaml
只查看kube-system的名称空间信息并以yaml格式显式[root@master ~]# kubectl get namespace kube-system -o yaml
apiVersion: v1
kind: Namespace
metadata:
creationTimestamp: "2020-10-01T22:32:28Z"
managedFields:
- apiVersion: v1
fieldsType: FieldsV1
fieldsV1:
f:status:
f:phase: {}
manager: kube-apiserver
operation: Update
time: "2020-10-01T22:32:28Z"
name: kube-system
resourceVersion: "4"
selfLink: /api/v1/namespaces/kube-system
uid: 58592158-9fcd-41f7-9305-c79ee1161468
spec:
finalizers:
- kubernetes
status:
phase: Active
只查看kube-system的名称空间信息并以json格式显式
[root@master ~]# kubectl get namespace kube-system -o json
{
"apiVersion": "v1",
"kind": "Namespace",
"metadata": {
"creationTimestamp": "2020-10-01T22:32:28Z",
"managedFields": [
{
"apiVersion": "v1",
"fieldsType": "FieldsV1",
"fieldsV1": {
"f:status": {
"f:phase": {}
}
},
"manager": "kube-apiserver",
"operation": "Update",
"time": "2020-10-01T22:32:28Z"
}
],
"name": "kube-system",
"resourceVersion": "4",
"selfLink": "/api/v1/namespaces/kube-system",
"uid": "58592158-9fcd-41f7-9305-c79ee1161468"
},
"spec": {
"finalizers": [
"kubernetes"
]
},
"status": {
"phase": "Active"
}
}
查看指定名称空间的pod(在k8s中容器被封装成pod)
[root@master ~]# kubectl get pods --all-namespaces
NAMESPACE NAME READY STATUS RESTARTS AGE
kube-system coredns-f9fd979d6-8bqmr 0/1 Pending 0 87m
kube-system coredns-f9fd979d6-9hgs9 0/1 Pending 0 87m
kube-system etcd-master 1/1 Running 3 87m
kube-system kube-apiserver-master 1/1 Running 3 87m
kube-system kube-controller-manager-master 1/1 Running 0 41m
kube-system kube-proxy-7k5wr 1/1 Running 0 86m
kube-system kube-proxy-9m8jq 1/1 Running 0 84m
kube-system kube-proxy-bjhk9 1/1 Running 2 87m
kube-system kube-scheduler-master 1/1 Running 0 42m
ns-elastic elasticsearch-data-0 0/1 Pending 0 77m
ns-elastic elasticsearch-master-0 0/1 Pending 0 77m
[root@master ~]# kubectl get pods -n ns-elastic
NAME READY STATUS RESTARTS AGE
elasticsearch-data-0 0/1 Pending 0 77m
elasticsearch-master-0 0/1 Pending 0 77m
[root@master ~]#
查看当前集群的deployments控制器
[root@master ~]# kubectl get deploy -n kube-system -o wide
NAME READY UP-TO-DATE AVAILABLE AGE CONTAINERS IMAGES SELECTOR
coredns 0/2 2 0 100m coredns k8s.gcr.io/coredns:1.7.0 k8s-app=kube-dns
查看名称空间，namespace简写形式
[root@master ~]# kubectl get ns
NAME STATUS AGE
default Active 101m
kube-node-lease Active 101m
kube-public Active 101m
kube-system Active 101m
ns-elastic Active 94m
删除资源
删除名称为"ns-elastic"名称空间,如果想要删除多个名称空间使用空格隔开即可，删除资源时会删除该名称空间下的所有pods资源,因此删除名称空间是很危险的操作，生产环境要谨慎操作
[root@master ~]# kubectl get ns
NAME STATUS AGE
default Active 104m
kube-node-lease Active 104m
kube-public Active 104m
kube-system Active 104m
ns-elastic Active 97m
[root@master ~]# kubectl delete ns ns-elastic
namespace "ns-elastic" deleted
[root@master ~]# kubectl get ns
NAME STATUS AGE
default Active 105m
kube-node-lease Active 105m
kube-public Active 105m
kube-system Active 105m