Kubernetes 瀛︿範21 kubernetes楂樼骇璋冨害鏂瑰紡
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[root@k8smaster ~]# kubectl explain pod.spec.nodeSelector KIND: Pod VERSION: v1 FIELD: nodeSelector <map[string]string> DESCRIPTION: NodeSelector is a selector which must be true for the pod to fit on a node. Selector which must match a node鈥?/span>s labels for the pod to be scheduled on that node. More info: https://kubernetes.io/docs/concepts/configuration/assign-pod-node/
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[root@k8smaster schedule]# cat pod-demo.yaml apiVersion: v1 kind: Pod metadata: name: pod-demo namespace: default labels: #涔熷彲浠ュ湪姝ゅ鍐欎笂app:myapp,tier:frontend浠ｆ浛涓嬮潰涓よ app: myapp #搴旂敤灞傜骇鏍囩 tier: frontend #鏋舵瀯灞傜骇鏍囩锛屽湪鍒嗗眰鏋舵瀯涓睘浜巉rontend灞? annotations: wohaoshuai.com/created-by: "cluster admin" spec: containers: #鏄竴涓垪琛紝鍏蜂綋瀹氫箟鏂瑰紡濡備笅 - name: myapp image: ikubernetes/myapp:v1 nodeSelector: disktype: ssd [root@k8smaster schedule]# kubectl apply -f pod-demo.yaml pod/pod-demo created [root@k8smaster schedule]# kubectl get pods -o wide --show-labels NAME READY STATUS RESTARTS AGE IP NODE LABELS pod-demo 1/1 Running 0 25s 10.244.1.3 k8snode1 app=myapp,tier=frontend [root@k8smaster schedule]# kubectl get nodes --show-labels NAME STATUS ROLES AGE VERSION LABELS k8smaster Ready master 103d v1.11.1 beta.kubernetes.io/arch=amd64,beta.kubernetes.io/os=linux,kubernetes.io/hostname=k8smaster,node-role.kubernetes.io/master= k8snode1 Ready <none> 103d v1.11.1 beta.kubernetes.io/arch=amd64,beta.kubernetes.io/os=linux,disktype=ssd,kubernetes.io/hostname=k8snode1 k8snode2 Ready <none> 103d v1.11.1 beta.kubernetes.io/arch=amd64,beta.kubernetes.io/os=linux,kubernetes.io/hostname=k8snode2
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[root@k8smaster schedule]# cat pod-demo.yaml apiVersion: v1 kind: Pod metadata: name: pod-demo namespace: default labels: #涔熷彲浠ュ湪姝ゅ鍐欎笂app:myapp,tier:frontend浠ｆ浛涓嬮潰涓よ app: myapp #搴旂敤灞傜骇鏍囩 tier: frontend #鏋舵瀯灞傜骇鏍囩锛屽湪鍒嗗眰鏋舵瀯涓睘浜巉rontend灞? annotations: wohaoshuai.com/created-by: "cluster admin" spec: containers: #鏄竴涓垪琛紝鍏蜂綋瀹氫箟鏂瑰紡濡備笅 - name: myapp image: ikubernetes/myapp:v1 nodeSelector: disktype: hirddisk [root@k8smaster schedule]# kubectl apply -f pod-demo.yaml pod/pod-demo created [root@k8smaster schedule]# kubectl get pods -o wide NAME READY STATUS RESTARTS AGE IP NODE pod-demo 0/1 Pending 0 21s <none> <none> [root@k8smaster schedule]# kubectl describe pods pod-demo Name: pod-demo Namespace: default Priority: 0 PriorityClassName: <none> Node: <none> Labels: app=myapp tier=frontend Annotations: kubectl.kubernetes.io/last-applied-configuration="apiVersion":"v1","kind":"Pod","metadata":"annotations":"wohaoshuai.com/created-by":"cluster admin","labels":"app": "myapp","tier":"frontend","nam... wohaoshuai.com/created-by=cluster admin Status: Pending IP: Containers: myapp: Image: ikubernetes/myapp:v1 Port: <none> Host Port: <none> Environment: <none> Mounts: /var/run/secrets/kubernetes.io/serviceaccount from default-token-jvtl7 (ro) Conditions: Type Status PodScheduled False Volumes: default-token-jvtl7: Type: Secret (a volume populated by a Secret) SecretName: default-token-jvtl7 Optional: false QoS Class: BestEffort Node-Selectors: disktype=hirddisk Tolerations: node.kubernetes.io/not-ready:NoExecute for 300s node.kubernetes.io/unreachable:NoExecute for 300s Events: Type Reason Age From Message ---- ------ ---- ---- ------- Warning FailedScheduling 2s (x16 over 45s) default-scheduler 0/3 nodes are available: 3 node(s) didn鈥?/span>t match node selector.
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[root@k8smaster schedule]# kubectl label nodes k8snode2 disktype=hirddisk --overwrite node/k8snode2 labeled [root@k8smaster schedule]# kubectl get pods -o wide NAME READY STATUS RESTARTS AGE IP NODE pod-demo 1/1 Running 0 6m 10.244.2.3 k8snode2
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[root@k8smaster schedule]# kubectl explain pods.spec.affinity KIND: Pod VERSION: v1 RESOURCE: affinity <Object> DESCRIPTION: If specified, the pod鈥?/span>s scheduling constraints Affinity is a group of affinity scheduling rules. FIELDS: nodeAffinity <Object> Describes node affinity scheduling rules for the pod. podAffinity <Object> Describes pod affinity scheduling rules (e.g. co-locate this pod in the same node, zone, etc. as some other pod(s)). podAntiAffinity <Object> Describes pod anti-affinity scheduling rules (e.g. avoid putting this pod in the same node, zone, etc. as some other pod(s)).
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