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如何理解K8S中kubectl

发布时间：2021-09-26 15:56:54 作者：柒染
来源：亿速云 阅读：170

这期内容当中小编将会给大家带来有关如何理解K8S中kubectl，文章内容丰富且以专业的角度为大家分析和叙述，阅读完这篇文章希望大家可以有所收获。

一、kubectl 陈述式管理方法

kubectl小洁：
kubectl是官方的CLI命令行工具，用于apiserver进行通信，将用户在命令行输入的命令，组织并转化为apiserver能识别的信息，进而实现管理k8s各种资源的一种有效途径。

1、查看当前集群所有命名空间
[root@test-nodes1 ~]# kubectl get namespace
NAME              STATUS   AGE
default           Active   42h
kube-node-lease   Active   42h
kube-public       Active   42h
kube-system       Active   42h
------------------------------------------------------------------------------------------
2、查看default命名空间下的所有资源
[root@test-nodes1 ~]# kubectl get all -n default
NAME                  READY   STATUS             RESTARTS   AGE
pod/nginx-ds-76fr8    0/1     ImagePullBackOff   0          39h
pod/nginx-ds-zz7jn    0/1     ErrImagePull       0          39h
pod/nginx-ds1-qg45q   1/1     Running            0          39h
pod/nginx-ds1-whnmv   1/1     Running            0          39h
#pod资源

NAME                 TYPE        CLUSTER-IP    EXTERNAL-IP   PORT(S)   AGE
service/kubernetes   ClusterIP   192.168.0.1   <none>        443/TCP   42h
#service资源

NAME                       DESIRED   CURRENT   READY   UP-TO-DATE   AVAILABLE   NODE SELECTOR   AGE
daemonset.apps/nginx-ds    2         2         0       2            0           <none>          39h
daemonset.apps/nginx-ds1   2         2         2       2            2           <none>          39h
#pod控制器
------------------------------------------------------------------------------------------

3、创建与删除命名空间
[root@test-nodes1 ~]# kubectl create namespace test
namespace/test created
[root@test-nodes1 ~]# kubectl get namespace
NAME              STATUS   AGE
default           Active   42h
kube-node-lease   Active   42h
kube-public       Active   42h
kube-system       Active   42h
test              Active   6s
[root@test-nodes1 ~]# kubectl delete namespace test
namespace "test" deleted
------------------------------------------------------------------------------------------

4、创建deployment（pods控制器)资源
[root@test-nodes1 ~]# kubectl create deployment nignx-dp --image=test-harbor.cedarhd.com/public/nginx:v1.7.9 -n kube-public
deployment.apps/nignx-dp created
------------------------------------------------------------------------------------------

5、查看kube-public命名空间下的deployment资源控制器
[root@test-nodes1 ~]# kubectl get deployment -n kube-public
NAME       READY   UP-TO-DATE   AVAILABLE   AGE
nignx-test   0/1     1            0           70s
------------------------------------------------------------------------------------------

6、查看kube-public命名空间下pods的运行情况
[root@test-nodes1 ~]# kubectl get deployment -n kube-public
NAME         READY   UP-TO-DATE   AVAILABLE   AGE
nignx-test   1/1     1            1           21s
------------------------------------------------------------------------------------------

7、查看kube-public空间下的pods资源
[root@test-nodes1 ~]# kubectl get pods -n kube-public -o wide
NAME                          READY   STATUS             RESTARTS   AGE    IP           NODE                      NOMINATED NODE   READINESS GATES
nignx-dp-7f6d4979bd-nnc57     0/1     ImagePullBackOff   0          13m    172.7.21.4   test-nodes1.cedarhd.com   <none>           <none>
nignx-test-655d6fbcb5-r9t57   1/1     Running            0          4m1s   172.7.22.4   test-nodes2.cedarhd.com   <none>           <none>
------------------------------------------------------------------------------------------

8、在test-nodes2.cedarhd.com节点上curl 172.7.22.4 nginx
[root@test-nodes2 ~]# curl 172.7.22.4
<!DOCTYPE html>
<html>
<head>
<title>Welcome to nginx!</title>
<style>
    body {
        width: 35em;
        margin: 0 auto;
        font-family: Tahoma, Verdana, Arial, sans-serif;
    }
</style>
</head>
<body>
<h2>Welcome to nginx!</h2>
<p>If you see this page, the nginx web server is successfully installed and
working. Further configuration is required.</p>

<p>For online documentation and support please refer to
<a href="http://nginx.org/">nginx.org</a>.<br/>
Commercial support is available at
<a href="http://nginx.com/">nginx.com</a>.</p>

<p><em>Thank you for using nginx.</em></p>
</body>
</html>
------------------------------------------------------------------------------------------

9、查看deployment下具体pods（nginx-test）详细信息
[root@test-nodes1 ~]# kubectl describe deployment nignx-test -n kube-public
Name:                   nignx-test
Namespace:              kube-public
CreationTimestamp:      Mon, 03 Feb 2020 02:02:59 -0500
Labels:                 app=nignx-test
Annotations:            deployment.kubernetes.io/revision: 1
Selector:               app=nignx-test
Replicas:               1 desired | 1 updated | 1 total | 1 available | 0 unavailable
StrategyType:           RollingUpdate
MinReadySeconds:        0
RollingUpdateStrategy:  25% max unavailable, 25% max surge
Pod Template:
  Labels:  app=nignx-test
  Containers:
   nginx:
    Image:        test-harbor.cedarhd.com/public/nginx:v1.7.9
    Port:         <none>
    Host Port:    <none>
    Environment:  <none>
    Mounts:       <none>
  Volumes:        <none>
Conditions:
  Type           Status  Reason
  ----           ------  ------
  Available      True    MinimumReplicasAvailable
  Progressing    True    NewReplicaSetAvailable
OldReplicaSets:  <none>
NewReplicaSet:   nignx-test-655d6fbcb5 (1/1 replicas created)
Events:
  Type    Reason             Age   From                   Message
  ----    ------             ----  ----                   -------
  Normal  ScalingReplicaSet  22m   deployment-controller  Scaled up replica set nignx-test-655d6fbcb5 to 1
    ------------------------------------------------------------------------------------------

10、进入nginx-test pod资源
[root@test-nodes1 ~]# kubectl get pods -n kube-public
NAME                          READY   STATUS             RESTARTS   AGE
nignx-test-655d6fbcb5-r9t57   1/1     Running            0          24m
[root@test-nodes1 ~]# kubectl exec -ti nignx-test-655d6fbcb5-r9t57 /bin/bash -n kube-public
#与docker 操作方法一致
root@nignx-test-655d6fbcb5-r9t57:/# ip addr
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN qlen 1
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
12: eth0@if13: <BROADCAST,MULTICAST,UP,LOWER_UP,M-DOWN> mtu 1500 qdisc noqueue state UP 
    link/ether 02:42:ac:07:16:04 brd ff:ff:ff:ff:ff:ff
    inet 172.7.22.4/24 brd 172.7.22.255 scope global eth0
       valid_lft forever preferred_lft forever
------------------------------------------------------------------------------------------

11、删除pod资源（即重启）
[root@test-nodes1 ~]# kubectl delete pod nignx-test-655d6fbcb5-r9t57 -n kube-public
pod "nignx-test-655d6fbcb5-r9t57" deleted
[root@test-nodes1 ~]# kubectl get pods -n kube-public -o wide
NAME                          READY   STATUS             RESTARTS   AGE   IP           NODE                      NOMINATED NODE   READINESS GATES
nignx-dp-7f6d4979bd-nnc57     0/1     ImagePullBackOff   0          40m   172.7.21.4   test-nodes1.cedarhd.com   <none>           <none>
nignx-test-655d6fbcb5-c42z8   1/1     Running            0          18s   172.7.21.5   test-nodes1.cedarhd.com   <none>           <none>
------------------------------------------------------------------------------------------

12、删除deployment
[root@test-nodes1 ~]# kubectl get deploy -n kube-public
NAME         READY   UP-TO-DATE   AVAILABLE   AGE
nignx-dp     0/1     1            0           53m
nignx-test   1/1     1            1           36m
[root@test-nodes1 ~]# kubectl delete deploy nignx-dp -n kube-public
deployment.extensions "nignx-dp" deleted
------------------------------------------------------------------------------------------

13、为nginx-dp pod资源创建service资源，保障pod的高可用,通过集群IP访问
[root@test-nodes1 ~]# kubectl get all -n kube-public
NAME                            READY   STATUS    RESTARTS   AGE
pod/nginx-dp-5b9b697bcc-jtrlp   1/1     Running   0          17s
NAME                       READY   UP-TO-DATE   AVAILABLE   AGE
deployment.apps/nginx-dp   1/1     1            1           17s
NAME                                  DESIRED   CURRENT   READY   AGE
replicaset.apps/nginx-dp-5b9b697bcc   1         1         1       17s
[root@test-nodes1 ~]# kubectl get pods -n kube-public -o wide
NAME                        READY   STATUS    RESTARTS   AGE     IP           NODE                      NOMINATED NODE   READINESS GATES
nginx-dp-5b9b697bcc-jtrlp   1/1     Running   0          3m19s   172.7.21.4   test-nodes1.cedarhd.com   <none>           <none>
[root@test-nodes1 ~]# kubectl expose deployment nginx-dp --port=80 -n kube-public
service/nginx-dp exposed
[root@test-nodes1 ~]# kubectl get svc -n kube-public      #查看service资源
NAME       TYPE        CLUSTER-IP       EXTERNAL-IP   PORT(S)   AGE
nginx-dp   ClusterIP   192.168.224.56   <none>        80/TCP    12m
[root@test-nodes1 ~]# kubectl get all -n kube-public
NAME                            READY   STATUS    RESTARTS   AGE
pod/nginx-dp-5b9b697bcc-jtrlp   1/1     Running   0          5m21s
NAME               TYPE        CLUSTER-IP       EXTERNAL-IP   PORT(S)   AGE
service/nginx-dp   ClusterIP   192.168.224.56   <none>        80/TCP    79s
NAME                       READY   UP-TO-DATE   AVAILABLE   AGE
deployment.apps/nginx-dp   1/1     1            1           5m21s
NAME                                  DESIRED   CURRENT   READY   AGE
replicaset.apps/nginx-dp-5b9b697bcc   1         1         1       5m21s
[root@test-nodes1 ~]# curl 192.168.224.56
<!DOCTYPE html>
<html>
<head>
<title>Welcome to nginx!</title>
<style>
    body {
        width: 35em;
        margin: 0 auto;
        font-family: Tahoma, Verdana, Arial, sans-serif;
    }
</style>
</head>
<body>
<h2>Welcome to nginx!</h2>
<p>If you see this page, the nginx web server is successfully installed and
working. Further configuration is required.</p>

<p>For online documentation and support please refer to
<a href="http://nginx.org/">nginx.org</a>.<br/>
Commercial support is available at
<a href="http://nginx.com/">nginx.com</a>.</p>

<p><em>Thank you for using nginx.</em></p>
</body>
</html>
[root@test-nodes1 ~]# ipvsadm -ln
IP Virtual Server version 1.2.1 (size=4096)
Prot LocalAddress:Port Scheduler Flags
  -> RemoteAddress:Port           Forward Weight ActiveConn InActConn
TCP  192.168.0.1:443 nq
  -> 10.3.153.221:6443            Masq    1      0          0         
  -> 10.3.153.222:6443            Masq    1      0          0         
TCP  192.168.224.56:80 nq
  -> 172.7.21.4:80                Masq    1      0          0

二、kubectl 声明式管理方法

小结：
声明式资源管理方法依赖于—资源配置清单（yaml\json），偏于修改POD配置。

如何理解K8S中kubectl

1、查看当前pod的资源配置清单
[root@test-nodes1 ~]# kubectl get pods -n kube-public
NAME                        READY   STATUS    RESTARTS   AGE
nginx-dp-5b9b697bcc-jtrlp   1/1     Running   0          5h31m
-nodes1.cedarhd.com   <none>           <none>
[root@test-nodes1 ~]# kubectl get pods nginx-dp-5b9b697bcc-jtrlp -n kube-public -o yaml
apiVersion: v1
kind: Pod                #类型为pod
metadata:
  creationTimestamp: "2020-02-03T07:50:11Z"
  generateName: nginx-dp-5b9b697bcc-
  labels:
    app: nginx-dp
    pod-template-hash: 5b9b697bcc
  name: nginx-dp-5b9b697bcc-jtrlp
  namespace: kube-public
  ownerReferences:
  - apiVersion: apps/v1
    blockOwnerDeletion: true
    controller: true
    kind: ReplicaSet
    name: nginx-dp-5b9b697bcc
    uid: 30bbaf90-c97e-4167-9419-45a632e9b3ce
  resourceVersion: "222257"
  selfLink: /api/v1/namespaces/kube-public/pods/nginx-dp-5b9b697bcc-jtrlp
  uid: 59d63844-8ee7-4d7e-8536-d4e5de1ba903
spec:
  containers:
  - image: test-harbor.cedarhd.com/public/nginx:v1.7.9
    imagePullPolicy: IfNotPresent
    name: nginx
    resources: {}
    terminationMessagePath: /dev/termination-log
    terminationMessagePolicy: File
    volumeMounts:
    - mountPath: /var/run/secrets/kubernetes.io/serviceaccount
      name: default-token-nt4w9
      readOnly: true
  dnsPolicy: ClusterFirst
  enableServiceLinks: true
  nodeName: test-nodes1.cedarhd.com
  priority: 0
  restartPolicy: Always
  schedulerName: default-scheduler
  securityContext: {}
  serviceAccount: default
  serviceAccountName: default
  terminationGracePeriodSeconds: 30
  tolerations:
  - effect: NoExecute
    key: node.kubernetes.io/not-ready
    operator: Exists
    tolerationSeconds: 300
  - effect: NoExecute
    key: node.kubernetes.io/unreachable
    operator: Exists
    tolerationSeconds: 300
  volumes:
  - name: default-token-nt4w9
    secret:
      defaultMode: 420
      secretName: default-token-nt4w9
status:
  conditions:
  - lastProbeTime: null
    lastTransitionTime: "2020-02-03T07:50:11Z"
    status: "True"
    type: Initialized
  - lastProbeTime: null
    lastTransitionTime: "2020-02-03T07:50:14Z"
    status: "True"
    type: Ready
  - lastProbeTime: null
    lastTransitionTime: "2020-02-03T07:50:14Z"
    status: "True"
    type: ContainersReady
  - lastProbeTime: null
    lastTransitionTime: "2020-02-03T07:50:11Z"
    status: "True"
    type: PodScheduled
  containerStatuses:
  - containerID: docker://745d5ad3412e5bccf2fb27dacce57e76987e8f6881cdb3aec79912888ba37ad6
    image: test-harbor.cedarhd.com/public/nginx:v1.7.9
    imageID: docker-pullable://test-harbor.cedarhd.com/public/nginx@sha256:b1f5935eb2e9e2ae89c0b3e2e148c19068d91ca502e857052f14db230443e4c2
    lastState: {}
    name: nginx
    ready: true
    restartCount: 0
    state:
      running:
        startedAt: "2020-02-03T07:50:13Z"
  hostIP: 10.3.153.221
  phase: Running
  podIP: 172.7.21.4
  qosClass: BestEffort
  startTime: "2020-02-03T07:50:11Z"
------------------------------------------------------------------------------------------

2、获取service资源的配置清单
[root@test-nodes1 ~]# kubectl get service -n kube-public
NAME       TYPE        CLUSTER-IP       EXTERNAL-IP   PORT(S)   AGE
nginx-dp   ClusterIP   192.168.224.56   <none>        80/TCP    5h31m
[root@test-nodes1 ~]# kubectl get service nginx-dp -o yaml -n kube-public
apiVersion: v1
kind: Service        #类型为service
metadata:
  creationTimestamp: "2020-02-03T07:54:13Z"
  labels:
    app: nginx-dp
  name: nginx-dp
  namespace: kube-public
  resourceVersion: "222606"
  selfLink: /api/v1/namespaces/kube-public/services/nginx-dp
  uid: 1b2310b5-6016-4692-b632-5c43d6dc4de5
spec:
  clusterIP: 192.168.224.56
  ports:
  - port: 80
    protocol: TCP
    targetPort: 80
  selector:
    app: nginx-dp
  sessionAffinity: None
  type: ClusterIP
status:
  loadBalancer: {}
    ------------------------------------------------------------------------------------------

3、explain查看字段帮助说明
kubectl explain service.metadata
 ------------------------------------------------------------------------------------------

4、新建一个service的资源配置清单
[root@test-nodes1 ~]# vi nginx-ds-svc.yaml
apiVersion: v1
kind: Service
metadata:
  labels:
    app: nginx-ds
  name: nginx-ds
  namespace: kube-public
spec:
  ports:
  - port: 80
    protocol: TCP
    targetPort: 80
  selector:
    app: nginx-ds
  sessionAffinity: None
  type: ClusterIP
------------------------------------------------------------------------------------------

5、通过声明式资源配置清单创建一个service资源
[root@test-nodes1 ~]# kubectl create -f nginx-ds-svc.yaml 
service/nginx-ds created
[root@test-nodes1 ~]# kubectl get service -n kube-public
NAME       TYPE        CLUSTER-IP       EXTERNAL-IP   PORT(S)   AGE
nginx-dp   ClusterIP   192.168.224.56   <none>        80/TCP    5h39m
nginx-ds   ClusterIP   192.168.66.3     <none>        80/TCP    16s
------------------------------------------------------------------------------------------

6、在线修改nginx-ds的 service 资源端口为81
[root@test-nodes1 ~]# kubectl get svc -n kube-public
NAME       TYPE        CLUSTER-IP       EXTERNAL-IP   PORT(S)   AGE
nginx-dp   ClusterIP   192.168.224.56   <none>        80/TCP    5h49m
nginx-ds   ClusterIP   192.168.66.3     <none>        80/TCP    10m

[root@test-nodes1 ~]# kubectl edit svc nginx-ds -n kube-public
# Please edit the object below. Lines beginning with a '#' will be ignored,
# and an empty file will abort the edit. If an error occurs while saving this file will be
# reopened with the relevant failures.
#
apiVersion: v1
kind: Service
metadata:
  creationTimestamp: "2020-02-03T13:23:41Z"
  labels:
    app: nginx-ds
  name: nginx-ds
  namespace: kube-public
  resourceVersion: "250724"
  selfLink: /api/v1/namespaces/kube-public/services/nginx-ds
  uid: 5840630d-e00d-4e98-91a1-2b65a1eb22f4
spec:
  clusterIP: 192.168.66.3
  ports:
  - port: 81      #修改对外端口81
    protocol: TCP
    targetPort: 80
  selector:
    app: nginx-ds
  sessionAffinity: None
  type: ClusterIP
status:
  loadBalancer: {}
"/tmp/kubectl-edit-wp634.yaml" 27L, 684C written
service/nginx-ds edited
[root@test-nodes1 ~]# kubectl get svc -n kube-public
NAME       TYPE        CLUSTER-IP       EXTERNAL-IP   PORT(S)   AGE
nginx-dp   ClusterIP   192.168.224.56   <none>        80/TCP    5h50m
nginx-ds   ClusterIP   192.168.66.3     <none>        81/TCP    10m
------------------------------------------------------------------------------------------

7、删除一个service资源
[root@test-nodes1 ~]# kubectl delete svc nginx-ds -n kube-public
service "nginx-ds" deleted

三、关于kubectl的核心资源理解

[root@test-nodes1 ~]# kubectl get all -n kube-public
NAME                            READY   STATUS    RESTARTS   AGE
pod/nginx-dp-5b9b697bcc-jtrlp   1/1     Running   0          6h2m
#pod资源，承载容器应用所在

NAME               TYPE        CLUSTER-IP       EXTERNAL-IP   PORT(S)   AGE
service/nginx-dp   ClusterIP   192.168.224.56   <none>        80/TCP    5h67m
#service资源，Service是Kubernetes里最核心的资源对象之一,Service定义了一个服务的访问入口地址,前端的应用(Pod)通过这个入口地址访问其背后的一组由Pod副本组成的集群实力

NAME                       READY   UP-TO-DATE   AVAILABLE   AGE
deployment.apps/nginx-dp   1/1     1            1           6h2m
#deployment资源，Deployment同样也是Kubernetes系统的一个核心概念，
主要职责和RC一样的都是保证Pod的数量和健康，可理解为pod控制器,
当我们删除pod时，会再启动，不是真正删除，如需删除该pod，必须删除
该控制器

NAME                                  DESIRED   CURRENT   READY   AGE
replicaset.apps/nginx-dp-5b9b697bcc   1         1         1       6h2m

四、通过kubectl单独创建一个pod\deployment\service

1、创建一个nginx pod
[root@test-nodes1 ~]# vi nginx-pod.yaml
apiVersion: v1
kind: Pod
metadata:
  name: nginx
  labels:
    app: web
spec:
  containers:
    - name: nginx
      image: test-harbor.cedarhd.com/public/nginx:v1.7.9
      ports:
        - containerPort: 80

[root@test-nodes1 ~]# kubectl create -f nginx-pod.yaml       #创建一个POD
pod/nginx created
[root@test-nodes1 ~]# kubectl get all
NAME                  READY   STATUS    RESTARTS   AGE
pod/nginx             1/1     Running   0          10m       #刚刚创建的POD
pod/nginx-ds1-qg45q   1/1     Running   0          47h
pod/nginx-ds1-whnmv   1/1     Running   0          47h
NAME                 TYPE        CLUSTER-IP    EXTERNAL-IP   PORT(S)   AGE
service/kubernetes   ClusterIP   192.168.0.1   <none>        443/TCP   2d2h
NAME                       DESIRED   CURRENT   READY   UP-TO-DATE   AVAILABLE   NODE SELECTOR   AGE
daemonset.apps/nginx-ds1   2         2         2       2            2           <none>          47h
------------------------------------------------------------------------------------------

2、为该pod创建一个service
[root@test-nodes1 ~]# kubectl expose pod nginx --port=80 -n default
service/nginx exposed
[root@test-nodes2 ~]# kubectl get all 
NAME                  READY   STATUS    RESTARTS   AGE
pod/nginx             1/1     Running   0          14m
pod/nginx-ds1-qg45q   1/1     Running   0          47h
pod/nginx-ds1-whnmv   1/1     Running   0          47h

NAME                 TYPE        CLUSTER-IP        EXTERNAL-IP   PORT(S)   AGE
service/kubernetes   ClusterIP   192.168.0.1       <none>        443/TCP   2d2h
service/nginx        ClusterIP   192.168.123.163   <none>        80/TCP    107s

NAME                       DESIRED   CURRENT   READY   UP-TO-DATE   AVAILABLE   NODE SELECTOR   AGE
daemonset.apps/nginx-ds1   2         2         2       2            2           <none>          47h
[root@test-nodes2 ~]# curl 192.168.123.163    获取nginx页面
------------------------------------------------------------------------------------------

3、创建一个deployment
[root@test-nodes2 ~]# kubectl create deployment nginx-test --image=test-harbor.cedarhd.com/public/nginx:v1.7.9
deployment.apps/nginx-test created
[root@test-nodes2 ~]# kubectl get all
NAME                              READY   STATUS    RESTARTS   AGE
pod/nginx                         1/1     Running   0          27m
pod/nginx-ds1-qg45q               1/1     Running   0          47h
pod/nginx-ds1-whnmv               1/1     Running   0          47h
pod/nginx-test-5674474869-5nr7j   1/1     Running   0          4s

NAME                 TYPE        CLUSTER-IP        EXTERNAL-IP   PORT(S)   AGE
service/kubernetes   ClusterIP   192.168.0.1       <none>        443/TCP   2d2h
service/nginx        ClusterIP   192.168.123.163   <none>        80/TCP    15m

NAME                       DESIRED   CURRENT   READY   UP-TO-DATE   AVAILABLE   NODE SELECTOR   AGE
daemonset.apps/nginx-ds1   2         2         2       2            2           <none>          47h

NAME                         READY   UP-TO-DATE   AVAILABLE   AGE
deployment.apps/nginx-test   1/1     1            1           4s

NAME                                    DESIRED   CURRENT   READY   AGE
replicaset.apps/nginx-test-5674474869   1         1         1       4s

上述就是小编为大家分享的如何理解K8S中kubectl了，如果刚好有类似的疑惑，不妨参照上述分析进行理解。如果想知道更多相关知识，欢迎关注亿速云行业资讯频道。

推荐阅读：
  1. kubectl && YAML,深入理解pod对象(下)
  2. 初识Kubernetes（K8s）：kubectl命令使用详

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