K8S-控制器進階之標籤管理
阿新 • • 發佈：2021-11-21
控制器進階 標籤管理
Always 總是去倉庫下載, Nerver 從不下載, IfNotPresent：先載入本地，若無再去倉庫下載
自主式pod資源 —不受控制器控制的pod
叢集管理命令
]# kubectl cordon node1 //標記node1 不被排程，pod將不會被排程到該node節點上面 ]# kubectl get nodes NAME STATUS ROLES AGE VERSION master Ready master 48d v1.17.11 node1 Ready,SchedulingDisabled <none> 48d v1.17.11 //可以看到排程被關閉 node2 Ready <none> 48d v1.17.11
]# kubectl uncordon node1 //取消node1標記，node1恢復排程 叢集node下線，pod驅逐 ]# kubectl drain node1 //node1節點pod驅逐，用於node下線等場景（可下線無狀態服務）
關於label與taint可以參考：Kubernetes對Pod排程指定Node以及Node的Taint 和 Toleration
叢集node標記汙點，實現反親pod與node反親和性
親和性：label 標籤：實現pod與node的親和性，只要標籤相同都會被排程到這個node上面
反親和性：taint：給node標記汙點，只要node有這個標籤，都不會被排程到這個node節點
pod標籤管理
master ~]# kubectl get pods -l app //只顯示標籤為app的pod NAME READY STATUS RESTARTS AGE pod-demo 1/2 CrashLoopBackOff 4 4m12s master ~]# kubectl get pods -L app //顯示所有標籤中帶有app的pod NAME READY STATUS RESTARTS AGE APP nginx-9ffc7d87b-4gjtn 1/1 Running 3 4d nginx-9ffc7d87b-5llww 1/1 Running 3 4d nginx-9ffc7d87b-jrq2h 1/1 Running 3 4d nginx-deploy-98c9d6c66-n25dd 1/1 Running 4 6d16h pod-demo 2/2 Running 5 4m32s myapp master ~]# kubectl get pods -l app --show-labels //更詳細的 NAME READY STATUS RESTARTS AGE LABELS pod-demo 1/2 CrashLoopBackOff 5 6m51s app=myapp,tier=frontend master ~]# kubectl get pods -L app,run //顯示多個pod的標籤值 NAME READY STATUS RESTARTS AGE APP RUN nginx-9ffc7d87b-4gjtn 1/1 Running 3 4d nginx nginx-9ffc7d87b-5llww 1/1 Running 3 4d nginx nginx-9ffc7d87b-jrq2h 1/1 Running 3 4d nginx nginx-deploy-98c9d6c66-n25dd 1/1 Running 4 6d16h nginx-deploy pod-demo 1/2 Running 6 8m8s myapp
pod增加或修改標籤
說明：標籤型別為key：vaule型別
master ~]# kubectl get pods pod-demo --show-labels //檢視標籤 NAME READY STATUS RESTARTS AGE LABELS pod-demo 2/2 Running 7 13m app=myapp,tier=frontend master ~]# kubectl label pods pod-demo release=stable //增加標籤 master ~]# kubectl get pods pod-demo --show-labels //再次檢視標籤 NAME READY STATUS RESTARTS AGE LABELS pod-demo 1/2 CrashLoopBackOff 7 15m app=myapp,release=stable,tier=frontend master ~]# kubectl label pods pod-demo release=release --overwrite //當該標籤已存在值需要加上--overwrite選項 master ~]# kubectl get pods pod-demo --show-labels //再次檢視 NAME READY STATUS RESTARTS AGE LABELS pod-demo 1/2 CrashLoopBackOff 8 20m app=myapp,release=stable,tier=frontend
標籤選擇器：
等值關係：=，==，！=
集合關係：key in (value1,value2…) 或者 key not in (value1,value2…)
等值關係演示
master ~]# kubectl get pod --show-labels NAME READY STATUS RESTARTS AGE LABELS nginx-9ffc7d87b-4gjtn 1/1 Running 3 4d1h pod-template-hash=9ffc7d87b,run=nginx nginx-9ffc7d87b-5llww 1/1 Running 3 4d1h pod-template-hash=9ffc7d87b,run=nginx nginx-9ffc7d87b-jrq2h 1/1 Running 3 4d1h pod-template-hash=9ffc7d87b,run=nginx nginx-deploy-98c9d6c66-n25dd 1/1 Running 4 6d16h pod-template-hash=98c9d6c66,run=nginx-deploy pod-demo 1/2 CrashLoopBackOff 9 28m app=myapp,release=stable,tier=frontend master ~]# kubectl label pods nginx-deploy-98c9d6c66-n25dd release=canary //增加標籤 master ~]# kubectl get pod -l release=stable --show-labels //檢視標籤release=stable的pod master ~]# kubectl get pods -l release //檢視標籤為release的pod NAME READY STATUS RESTARTS AGE nginx-deploy-98c9d6c66-n25dd 1/1 Running 4 6d16h pod-demo 1/2 CrashLoopBackOff 10 32m master ~]# kubectl get pods -l release,app //檢視標籤為release且等於app的pod master ~]# kubectl get pods -l release=stable,app=myapp //檢視標籤值release=stable,app=myapp的pod master ~]# kubectl get pod -l release!=stable,release!=canary --show-labels //檢視標籤值不等於xxx且xxx不等於xxpod
集合關係演示
集合關係：key in (value1,value2...) 或者 key not in (value1,value2...)說明：value必須為非空欄位 exists ，noexists (values欄位必須為空列表) master ~]# kubectl get pods -l "release in (stable,canary,aaa)" //或的關係，有一個也行，沒有就算了 NAME READY STATUS RESTARTS AGE nginx-deploy-98c9d6c66-n25dd 1/1 Running 4 6d21h pod-demo 1/2 CrashLoopBackOff 65 5h31m -master ~]# kubectl get pods -l "release notin (stable,canary,aaa)" //取反 NAME READY STATUS RESTARTS AGE nginx-9ffc7d87b-4gjtn 1/1 Running 3 4d6h nginx-9ffc7d87b-5llww 1/1 Running 3 4d6h nginx-9ffc7d87b-jrq2h 1/1 Running 3 4d6h nodeSelector 節點標籤選擇器 master ~]# kubectl label nodes k8s-node1 disktype=ssd //對node節點打標籤，在新增資源時，可以指定標籤來執行 master yaml]# vim pod-demo.yaml apiVersion: v1 kind: Pod metadata: name: pod-demo namespace: default labels: app: myapp tier: frontend annotations: //資源註解 rt/create-by: cluster-admin //建立人 spec: containers: - name: nginx image: nginx:latest imagePullPolicy: IfNotPresent ports: - name: http containerPort: 80 - name: busybox image: busybox:latest imagePullPolicy: IfNotPresent command: - "/bin/sh" - "-c" - "sleep 20" nodeSelector: //Node標籤選擇器 disktype: ssd //新建的資源只會建立在擁有disktype: ssd標籤的node上，當多個node擁有，根據排程演算法輪詢 nodeName: k8s-node2 /或者可以直接指定執行在指定的node節點上