查看节点信息
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11[root@k8s-master-61 ~]# kubectl get node NAME STATUS ROLES AGE VERSION k8s-master1 Ready <none> 10d v1.20.4 k8s-node1 Ready <none> 10d v1.20.4 k8s-node2 Ready <none> 10d v1.20.4 k8s-node3 Ready <none> 10d v1.20.4 k8s-node4 Ready <none> 12h v1.20.4 k8s-node5 Ready <none> 12h v1.20.4 k8s-node6 Ready <none> 12h v1.20.4 k8s-node7 Ready <none> 12h v1.20.4
查看master 的详细信息：可以看到 Taints: <none> 现在为none 是允许被调度的
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84[root@k8s-master-61 ~]# kubectl describe node k8s-master1 Name: k8s-master1 Roles: <none> Labels: beta.kubernetes.io/arch=amd64 beta.kubernetes.io/os=linux kubernetes.io/arch=amd64 kubernetes.io/hostname=k8s-master1 kubernetes.io/os=linux Annotations: node.alpha.kubernetes.io/ttl: 0 projectcalico.org/IPv4Address: 10.12.12.61/24 projectcalico.org/IPv4IPIPTunnelAddr: 10.244.159.128 volumes.kubernetes.io/controller-managed-attach-detach: true CreationTimestamp: Mon, 05 Jul 2021 16:43:36 +0800 Taints: <none> Unschedulable: false Lease: HolderIdentity: k8s-master1 AcquireTime: <unset> RenewTime: Thu, 15 Jul 2021 22:39:45 +0800 Conditions: Type Status LastHeartbeatTime LastTransitionTime Reason Message ---- ------ ----------------- ------------------ ------ ------- NetworkUnavailable False Tue, 06 Jul 2021 17:46:45 +0800 Tue, 06 Jul 2021 17:46:45 +0800 CalicoIsUp Calico is running on this node MemoryPressure False Thu, 15 Jul 2021 22:36:04 +0800 Mon, 05 Jul 2021 16:43:36 +0800 KubeletHasSufficientMemory kubelet has sufficient memory available DiskPressure False Thu, 15 Jul 2021 22:36:04 +0800 Mon, 05 Jul 2021 16:43:36 +0800 KubeletHasNoDiskPressure kubelet has no disk pressure PIDPressure False Thu, 15 Jul 2021 22:36:04 +0800 Mon, 05 Jul 2021 16:43:36 +0800 KubeletHasSufficientPID kubelet has sufficient PID available Ready True Thu, 15 Jul 2021 22:36:04 +0800 Mon, 05 Jul 2021 16:57:02 +0800 KubeletReady kubelet is posting ready status Addresses: InternalIP: 10.12.12.61 Hostname: k8s-master1 Capacity: cpu: 8 ephemeral-storage: 296935Mi hugepages-1Gi: 0 hugepages-2Mi: 0 memory: 16265976Ki pods: 110 Allocatable: cpu: 8 ephemeral-storage: 280223022641 hugepages-1Gi: 0 hugepages-2Mi: 0 memory: 16163576Ki pods: 110 System Info: Machine ID: f89478ac0ca640ab9594001e03138a40 System UUID: EA2C0F42-991C-2078-E06A-55925AF61AB0 Boot ID: a8a395d5-7836-43d4-9cc5-0e4729b4762d Kernel Version: 3.10.0-1062.el7.x86_64 OS Image: CentOS Linux 7 (Core) Operating System: linux Architecture: amd64 Container Runtime Version: docker://19.3.9 Kubelet Version: v1.20.4 Kube-Proxy Version: v1.20.4 PodCIDR: 10.244.0.0/24 PodCIDRs: 10.244.0.0/24 Non-terminated Pods: (13 in total) Namespace Name CPU Requests CPU Limits Memory Requests Memory Limits AGE --------- ---- ------------ ---------- --------------- ------------- --- default edu-service-operate-5ccf547fcd-njzjk 500m (6%) 1 (12%) 500Mi (3%) 1Gi (6%) 2d8h default educationcrm-echo-6494fcd8cd-rh6wf 500m (6%) 1 (12%) 500Mi (3%) 1Gi (6%) 2d7h default go-filestorage-b7d49844b-v7lk2 500m (6%) 1 (12%) 500Mi (3%) 1Gi (6%) 2d4h default zhiyue-pc-program-7d44f969d6-jnbrt 0 (0%) 0 (0%) 0 (0%) 0 (0%) 37h default zhiyueappgw-749bdfb57c-8ckrf 500m (6%) 1 (12%) 500Mi (3%) 1Gi (6%) 2d3h ingress-nginx nginx-ingress-controller-5dc64b58f-224qk 100m (1%) 0 (0%) 90Mi (0%) 0 (0%) 10d java-test2 scm-finance-88fd7d86f-nxhkt 500m (6%) 1 (12%) 500Mi (3%) 1Gi (6%) 7d11h java-test2 scm-report-669b5bdd87-j652f 500m (6%) 1 (12%) 500Mi (3%) 1Gi (6%) 7d7h java-test2 scm-warehouse-99d7dc885-6jpqb 500m (6%) 1 (12%) 500Mi (3%) 1Gi (6%) 7d11h kube-system calico-node-nqf9z 250m (3%) 0 (0%) 0 (0%) 0 (0%) 10d kube-system node-exporter-wh9bw 10m (0%) 10m (0%) 50Mi (0%) 50Mi (0%) 31h kube-system prometheus-0 210m (2%) 210m (2%) 1010Mi (6%) 1010Mi (6%) 31h pre scm-finance-795f7db7bf-fk92l 500m (6%) 1 (12%) 500Mi (3%) 1Gi (6%) 2d11h Allocated resources: (Total limits may be over 100 percent, i.e., overcommitted.) Resource Requests Limits -------- -------- ------ cpu 4570m (57%) 8220m (102%) memory 5150Mi (32%) 9252Mi (58%) ephemeral-storage 0 (0%) 0 (0%) hugepages-1Gi 0 (0%) 0 (0%) hugepages-2Mi 0 (0%) 0 (0%) Events: <none>
给master 打上污点：NoSchedule: 一定不能被调度
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3[root@k8s-master-61 ~]# kubectl taint nodes k8s-master1 node-role.kubernetes.io/master=:NoSchedule node/k8s-master1 tainted
kubectl taint node [node] key=value[effect]
其中[effect] 可取值: [ NoSchedule | PreferNoSchedule | NoExecute ]
NoSchedule: 一定不能被调度
PreferNoSchedule: 尽量不要调度
NoExecute: 不仅不会调度, 还会驱逐Node上已有的Pod
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3[root@k8s-master-61 ~]# kubectl describe node k8s-master1 | grep Taints Taints: node-role.kubernetes.io/master:NoSchedule
去掉污点，再次查看
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16[root@k8s-master-61 ~]# kubectl describe node k8s-master1 | grep Taints Taints: node-role.kubernetes.io/master:NoSchedule [root@k8s-master-61 ~]# [root@k8s-master-61 ~]# [root@k8s-master-61 ~]# kubectl taint nodes --all node-role.kubernetes.io/master- node/k8s-master1 untainted taint "node-role.kubernetes.io/master" not found taint "node-role.kubernetes.io/master" not found taint "node-role.kubernetes.io/master" not found taint "node-role.kubernetes.io/master" not found taint "node-role.kubernetes.io/master" not found taint "node-role.kubernetes.io/master" not found taint "node-role.kubernetes.io/master" not found [root@k8s-master-61 ~]# kubectl describe node k8s-master1 | grep Taints Taints: <none>
如果需要在master 上跑pod ， pod 的 spec 中设置 tolerations 字段
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6tolerations: - key: "node-role.kubernetes.io/master" operator: "Equal" value: "" effect: "NoSchedule"
最后
以上就是含蓄麦片最近收集整理的关于k8s master 打上污点不许被调度的全部内容，更多相关k8s内容请搜索靠谱客的其他文章。
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