集群扩容node节点

1.新节点安装docker,kubelet,kubeadm ,kubectl

2.kubelet设置enable；  docker设置enabled
systemctl  enable  docker  kubelet 

3.关闭swap分区
[root@node2 ~]# swapoff -a 
[root@node2 ~]# free -h 
              total        used        free      shared  buff/cache   available
Mem:           1.8G        174M        846M        9.5M        798M        1.4G
Swap:            0B          0B          0B

[root@node2 ~]# sed -i '/swap/s@\(.*\)@#\1@' /etc/fstab



4.加载ip_vs模块：
[root@node2 ipvs]# cat ipvs.sh 
#!/bin/bash 
modprobe -- ip_vs
modprobe -- ip_vs_sh
modprobe -- ip_vs_rr
modprobe -- ip_vs_wrr
modprobe -- nf_conntrack_ipv4

[root@node2 ipvs]#echo  "bash /root/ipvs/ipvs.sh" >>/etc/rc.local
[root@node2 ipvs]#chmod +x /etc/rc.local


5.测试是否启用ip_vs：
[root@node2 ipvs]# lsmod |grep ip_vs 
ip_vs_wrr              12697  0 
ip_vs_rr               12600  0 
ip_vs_sh               12688  0 
ip_vs                 145497  6 ip_vs_rr,ip_vs_sh,ip_vs_wrr
nf_conntrack          133095  7 ip_vs,nf_nat,nf_nat_ipv4,xt_conntrack,nf_nat_masquerade_ipv4,nf_conntrack_netlink,nf_conntrack_ipv4
libcrc32c              12644  4 xfs,ip_vs,nf_nat,nf_conntrack


6.master执行：
[root@master ipvs]# kubeadm token create --print-join-command
kubeadm join 192.168.100.200:6443 --token 5zv3v2.ee3gopn6n1jdr4rx     --discovery-token-ca-cert-hash sha256:442aa72184ea7de3f3ce8e6e97516e657061fa18a613794d66c3d7a68f3639c1




7.新增节点执行：
[root@node2 ~]# kubeadm join 192.168.100.200:6443 --token 5zv3v2.ee3gopn6n1jdr4rx     --discovery-token-ca-cert-hash sha256:442aa72184ea7de3f3ce8e6e97516e657061fa18a613794d66c3d7a68f3639c1
[preflight] Running pre-flight checks
    [WARNING SystemVerification]: this Docker version is not on the list of validated versions: 19.03.4. Latest validated version: 18.09
[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-1.16" 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] Activating the kubelet service
[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.
说明：新增节点已经成功加入集群。





8.在新增节点上运行flannel,pause,kube-proxy镜像：
[root@node1 ~]# docker save -o flannel.tar quay.io/coreos/flannel:v0.11.0-amd64
[root@node1 ~]# docker save -o kube-proxy.tar k8s.gcr.io/kube-proxy:v1.16.2
[root@node1 ~]# docker save -o pause.tar k8s.gcr.io/pause:3.1
[root@node1 ~]# scp flannel.tar kube-proxy.tar pause.tar   node2:/root/
root@node2's password: 
flannel.tar                                                                                                                100%   50MB  30.7MB/s   00:01    
kube-proxy.tar                                                                                                             100%   84MB  41.9MB/s   00:02    
pause.tar  

[root@node2 ~]# docker load -i flannel.tar
[root@node2 ~]# docker load < kube-proxy.tar 
[root@node2 ~]# docker load -i pause.tar




9.master节点查看：
[root@master ipvs]# kubectl get nodes
NAME     STATUS   ROLES    AGE   VERSION
master   Ready    master   30d   v1.16.2
node1    Ready    <none>   30d   v1.16.2
node2    Ready    <none>   30d   v1.16.2
说明：此时新增的node2节点已经加入集群成功。

[root@master ipvs]# kubectl get pod  -o wide 
NAME                                          READY   STATUS    RESTARTS   AGE     IP             NODE    NOMINATED NODE   READINESS GATES
httpd-856c97d764-6zq2d                        1/1     Running   14         18d     10.244.1.220   node1   <none>           <none>
jenkins-6d7fb8f845-6dr8n                      1/1     Running   0          5d20h   10.244.2.2       node2   <none>           <none>