kubeadmでインストール直後にNodeがNotReadyでもあわてない

概要

Kubernetesインストール直後はkubectl get nodes の結果はSTATUSがNotReadyになる。
CNIインストール後にReadyになる

インストール直後

[root@master01 .kube]# kubectl get nodes
NAME          STATUS     ROLES    AGE   VERSION
master01   NotReady   master   64m   v1.14.2
worker01   NotReady   <none>   17m   v1.14.2
worker02   NotReady   <none>   16m   v1.14.2

CNI(Flannel)インストール

[root@master01 .kube]# kubectl apply -f https://raw.githubusercontent.com/coreos/flannel/62e44c867a2846fefb68bd5f178daf4da3095ccb/Documentation/kube-flannel.yml
podsecuritypolicy.extensions/psp.flannel.unprivileged created
clusterrole.rbac.authorization.k8s.io/flannel created
clusterrolebinding.rbac.authorization.k8s.io/flannel created
serviceaccount/flannel created
configmap/kube-flannel-cfg created
daemonset.extensions/kube-flannel-ds-amd64 created
daemonset.extensions/kube-flannel-ds-arm64 created
daemonset.extensions/kube-flannel-ds-arm created
daemonset.extensions/kube-flannel-ds-ppc64le created
daemonset.extensions/kube-flannel-ds-s390x created

インストール後

徐々にReady化されていく。

[root@master01 .kube]# kubectl get node
NAME          STATUS     ROLES    AGE   VERSION
master01   NotReady   master   65m   v1.14.2
worker01   NotReady   <none>   18m   v1.14.2
worker02   NotReady   <none>   17m   v1.14.2
[root@master01 .kube]# kubectl get pods --all-namespaces
NAMESPACE     NAME                                  READY   STATUS     RESTARTS   AGE
kube-system   coredns-fb8b8dccf-g8lg5               0/1     Pending    0          65m
kube-system   coredns-fb8b8dccf-rlnm5               0/1     Pending    0          65m
kube-system   etcd-master01                      1/1     Running    0          64m
kube-system   kube-apiserver-master01            1/1     Running    0          63m
kube-system   kube-controller-manager-master01   1/1     Running    0          64m
kube-system   kube-flannel-ds-amd64-kbkrw           0/1     Init:0/1   0          21s
kube-system   kube-flannel-ds-amd64-krtx2           0/1     Init:0/1   0          21s
kube-system   kube-flannel-ds-amd64-r2pgg           0/1     Init:0/1   0          21s
kube-system   kube-proxy-9j9gt                      1/1     Running    0          65m
kube-system   kube-proxy-d7ckf                      1/1     Running    0          17m
kube-system   kube-proxy-mnm7m                      1/1     Running    0          18m
kube-system   kube-scheduler-master01            1/1     Running    0          64m
[root@master01 .kube]# kubectl get pods --all-namespaces -o wide
NAMESPACE     NAME                                  READY   STATUS              RESTARTS   AGE   IP           NODE          NOMINATED NODE   READINESS GATES
kube-system   coredns-fb8b8dccf-g8lg5               0/1     ContainerCreating   0          65m   <none>       worker01   <none>           <none>
kube-system   coredns-fb8b8dccf-rlnm5               0/1     ContainerCreating   0          65m   <none>       worker01   <none>           <none>
kube-system   etcd-master01                      1/1     Running             0          64m   10.0.0.110   master01   <none>           <none>
kube-system   kube-apiserver-master01            1/1     Running             0          64m   10.0.0.110   master01   <none>           <none>
kube-system   kube-controller-manager-master01   1/1     Running             0          64m   10.0.0.110   master01   <none>           <none>
kube-system   kube-flannel-ds-amd64-kbkrw           1/1     Running             0          47s   10.0.0.121   worker02   <none>           <none>
kube-system   kube-flannel-ds-amd64-krtx2           1/1     Running             0          47s   10.0.0.120   worker01   <none>           <none>
kube-system   kube-flannel-ds-amd64-r2pgg           1/1     Running             0          47s   10.0.0.110   master01   <none>           <none>
kube-system   kube-proxy-9j9gt                      1/1     Running             0          65m   10.0.0.110   master01   <none>           <none>
kube-system   kube-proxy-d7ckf                      1/1     Running             0          18m   10.0.0.121   worker02   <none>           <none>
kube-system   kube-proxy-mnm7m                      1/1     Running             0          19m   10.0.0.120   worker01   <none>           <none>
kube-system   kube-scheduler-master01            1/1     Running             0          64m   10.0.0.110   master01   <none>           <none>
[root@master01 .kube]# kubectl get pods --all-namespaces -o wide
NAMESPACE     NAME                                  READY   STATUS              RESTARTS   AGE   IP           NODE          NOMINATED NODE   READINESS GATES
kube-system   coredns-fb8b8dccf-g8lg5               0/1     ContainerCreating   0          65m   <none>       worker01   <none>           <none>
kube-system   coredns-fb8b8dccf-rlnm5               0/1     Running             0          65m   10.244.1.2   worker01   <none>           <none>
kube-system   etcd-master01                      1/1     Running             0          64m   10.0.0.110   master01   <none>           <none>
kube-system   kube-apiserver-master01            1/1     Running             0          64m   10.0.0.110   master01   <none>           <none>
kube-system   kube-controller-manager-master01   1/1     Running             0          64m   10.0.0.110   master01   <none>           <none>
kube-system   kube-flannel-ds-amd64-kbkrw           1/1     Running             0          57s   10.0.0.121   worker02   <none>           <none>
kube-system   kube-flannel-ds-amd64-krtx2           1/1     Running             0          57s   10.0.0.120   worker01   <none>           <none>
kube-system   kube-flannel-ds-amd64-r2pgg           1/1     Running             0          57s   10.0.0.110   master01   <none>           <none>
kube-system   kube-proxy-9j9gt                      1/1     Running             0          65m   10.0.0.110   master01   <none>           <none>
kube-system   kube-proxy-d7ckf                      1/1     Running             0          18m   10.0.0.121   worker02   <none>           <none>
kube-system   kube-proxy-mnm7m                      1/1     Running             0          19m   10.0.0.120   worker01   <none>           <none>
kube-system   kube-scheduler-master01            1/1     Running             0          64m   10.0.0.110   master01   <none>           <none>
[root@master01 .kube]# kubectl get pods --all-namespaces -o wide
NAMESPACE     NAME                                  READY   STATUS    RESTARTS   AGE   IP           NODE          NOMINATED NODE   READINESS GATES
kube-system   coredns-fb8b8dccf-g8lg5               0/1     Running   0          65m   10.244.1.3   worker01   <none>           <none>
kube-system   coredns-fb8b8dccf-rlnm5               0/1     Running   0          65m   10.244.1.2   worker01   <none>           <none>
kube-system   etcd-master01                      1/1     Running   0          64m   10.0.0.110   master01   <none>           <none>
kube-system   kube-apiserver-master01            1/1     Running   0          64m   10.0.0.110   master01   <none>           <none>
kube-system   kube-controller-manager-master01   1/1     Running   0          64m   10.0.0.110   master01   <none>           <none>
kube-system   kube-flannel-ds-amd64-kbkrw           1/1     Running   0          60s   10.0.0.121   worker02   <none>           <none>
kube-system   kube-flannel-ds-amd64-krtx2           1/1     Running   0          60s   10.0.0.120   worker01   <none>           <none>
kube-system   kube-flannel-ds-amd64-r2pgg           1/1     Running   0          60s   10.0.0.110   master01   <none>           <none>
kube-system   kube-proxy-9j9gt                      1/1     Running   0          65m   10.0.0.110   master01   <none>           <none>
kube-system   kube-proxy-d7ckf                      1/1     Running   0          18m   10.0.0.121   worker02   <none>           <none>
kube-system   kube-proxy-mnm7m                      1/1     Running   0          19m   10.0.0.120   worker01   <none>           <none>
kube-system   kube-scheduler-master01            1/1     Running   0          64m   10.0.0.110   master01   <none>           <none>
[root@master01 .kube]#
[root@master01 .kube]#
[root@master01 .kube]# kubectl get nodes
NAME          STATUS   ROLES    AGE   VERSION
master01   Ready    master   66m   v1.14.2
worker01   Ready    <none>   19m   v1.14.2
worker02   Ready    <none>   18m   v1.14.2

最後に

良い子はrootでやらないこと。