关于kubernetes:kubeadm增加master或node节点

kubeadm 装置 k8s-1.18.18

资源筹备

一、初始化资源

参考：https://segmentfault.com/a/11…

二、增加 node 节点

1、在 master 上生成新的 token

[root@k8s-master01 ~]# kubeadm token create --print-join-command --ttl=0

阐明：
–ttl= 0 代表工夫永不过期，不加此参数默认 24 小时过期

输入如下：

W0611 03:08:31.246969   63170 configset.go:202] WARNING: kubeadm cannot validate component configs for API groups [kubelet.config.k8s.io kubeproxy.config.k8s.io]
kubeadm join 192.168.219.160:6443 --token hkpvr9.bsfj9a6i7612vd59     --discovery-token-ca-cert-hash sha256:a8d537ee5d1a17e73ba94996744ccefd0d2f58f3871f29708e9c5642a28157b7

2、退出 node 节点

node 节点操作：

[root@k8s-node02 ~]# kubeadm join 192.168.219.160:6443 --token hkpvr9.bsfj9a6i7612vd59     --discovery-token-ca-cert-hash sha256:a8d537ee5d1a17e73ba94996744ccefd0d2f58f3871f29708e9c5642a28157b7

输入如下：

W0611 03:11:48.274867    3087 join.go:346] [preflight] WARNING: JoinControlPane.controlPlane settings will be ignored when control-plane flag is not set.
[preflight] Running pre-flight checks
    [WARNING IsDockerSystemdCheck]: detected "cgroupfs" as the Docker cgroup driver. The recommended driver is "systemd". Please follow the guide at https://kubernetes.io/docs/setup/cri/
[preflight] Reading configuration from the cluster...
[preflight] FYI: You can look at this config file with 'kubectl -n kube-system get cm kubeadm-config -oyaml'
[kubelet-start] Downloading configuration for the kubelet from the "kubelet-config-1.18" ConfigMap in the kube-system namespace
[kubelet-start] Writing kubelet configuration to file "/var/lib/kubelet/config.yaml"
[kubelet-start] Writing kubelet environment file with flags to file "/var/lib/kubelet/kubeadm-flags.env"
[kubelet-start] Starting the kubelet
[kubelet-start] Waiting for the kubelet to perform the TLS Bootstrap...

This node has joined the cluster:
* Certificate signing request was sent to apiserver and a response was received.
* The Kubelet was informed of the new secure connection details.

Run 'kubectl get nodes' on the control-plane to see this node join the cluster.

阐明：
kubernetes node 节点退出容器 [ERROR FileContent–proc-sys-net-ipv4-ip_forward]: /proc/sys/net/ipv4/ip_forward contents are not set to 1

解决：

[root@k8s-node02 ~]# sysctl -w net.ipv4.ip_forward=1

3、验证

在 master 节点上执行

[root@k8s-master01 ~]# kubectl get node

输入如下：

NAME           STATUS   ROLES    AGE   VERSION
k8s-master01   Ready    master   28h   v1.18.18
k8s-node01     Ready    <none>   28h   v1.18.18
k8s-node02     Ready    <none>   27m   v1.18.18

三、增加 master 节点

1、在 master 上生成用于新 master 退出的证书

[root@k8s-master01 ~]# kubeadm init phase upload-certs --experimental-upload-certs