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No taints on kubernetes master node – Nginx

Spec:

  • OS: Ubuntu 20.04
  • kubernetes version: 1.21.1

As far as I know, there will be taints on master node by default (node-role.kubernetes.io/master). However, there is no taint on any master node on my cluster

root@master3:~# `kubectl get node `

`NAME      STATUS   ROLES                  AGE   VERSION`

`master1   Ready    control-plane,master   25h   v1.21.1`

`master2   Ready    control-plane,master   25h   v1.21.1`

`master3   Ready    control-plane,master   25h   v1.21.1`

`worker1   Ready    <none>                 25h   v1.21.1`

`worker2   Ready    <none>                 25h   v1.21.1`

root@master3:~# `kubectl describe node master | grep -i taints`

`Taints:             <none>`<p>
`Taints:             <none>`<p>
`Taints:             <none>`<p>

And some pods are scheduled on master node

root@master3:~# kubectl get pod -o wide | grep master <p>
nginx-test-5dbdb6f988-dfmcv   1/1     Running   0          23m   10.233.97.35    master1   <none>           <none><p>
nginx-test-5dbdb6f988-flm4h   1/1     Running   0          22m   10.233.97.36    master1   <none>           <none><p>

Here is the yaml for deployment nginx-test

root@master3:~# `kubectl get deployment nginx-test -o yaml`<p>
`apiVersion: apps/v1`<p>
`kind: Deployment`<p>
`metadata:`<p>
`  annotations:`<p>
`    deployment.kubernetes.io/revision: "10"`<p>
`  creationTimestamp: "2021-07-06T01:33:19Z"`<p>
`  generation: 23`<p>
`  labels:`<p>
`    app: nginx-test`<p>
`  name: nginx-test`<p>
`  namespace: default`<p>
`  resourceVersion: "175269"`<p>
`  uid: 4a08b870-1b31-4d66-b39f-d25c70e4e22d`<p>
`spec:`<p>
`  progressDeadlineSeconds: 600`<p>
`  replicas: 15`<p>
`  revisionHistoryLimit: 10`<p>
`  selector:`<p>
`    matchLabels:`<p>
`      app: nginx-test`<p>
`  strategy:`<p>
`    rollingUpdate:`<p>
`      maxSurge: 25%`<p>
`      maxUnavailable: 25%`<p>
`    type: RollingUpdate`<p>
`  template:`<p>
`    metadata:`<p>
`      annotations:`<p>
`        kubectl.kubernetes.io/restartedAt: "2021-07-06T14:52:42+09:00"`<p>
`      creationTimestamp: null`<p>
`      labels:`<p>
`        app: nginx-test`<p>
`    spec:`<p>
`      containers:`<p>
`      - image: nginx`<p>
`        imagePullPolicy: Always`<p>
`        name: nginx`<p>
`        resources: {}`<p>
`        terminationMessagePath: /dev/termination-log`<p>
`        terminationMessagePolicy: File`<p>
`      dnsPolicy: ClusterFirst`<p>
`      restartPolicy: Always`<p>
`      schedulerName: default-scheduler`<p>
`      securityContext: {}`<p>
`      terminationGracePeriodSeconds: 30`<p>
`status:`<p>
`  availableReplicas: 15`<p>
`  conditions:`<p>
`  - lastTransitionTime: "2021-07-06T05:44:30Z"`<p>
`    lastUpdateTime: "2021-07-06T05:44:30Z"`<p>
`    message: Deployment has minimum availability.`<p>
`    reason: MinimumReplicasAvailable`<p>
`    status: "True"`<p>
`    type: Available`<p>
`  - lastTransitionTime: "2021-07-06T01:33:19Z"`<p>
`    lastUpdateTime: "2021-07-06T06:03:41Z"`<p>
`    message: ReplicaSet "nginx-test-5dbdb6f988" has successfully progressed.`<p>
`    reason: NewReplicaSetAvailable`<p>
`    status: "True"`<p>
`    type: Progressing`<p>
`  observedGeneration: 23`<p>
`  readyReplicas: 15`<p>
`  replicas: 15`<p>
`  updatedReplicas: 15`<p>
Tags:

2

Answers


  1. 0

    Taints on control plane nodes are not required. It all depends on how you installed Kubernetes and how it wants things to be. Single node installers, for example, don’t set them up or nothing would be able to run.

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  2. 0

    As I already mentioned in my previous comment, the issue was due to the fact that the master node was listed under the [kube-node] section of Kubespray inventory file instead of the proper [kube-master] section. That caused the taints to be removed. Putting the master node in the [kube-master] section will fix the problem.

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