k8s系列---Worker节点扩容

其他有关内容

安装：参考https://www.cnblogs.com/dribs/p/9082458.html

集群故障重置：参考https://www.cnblogs.com/dribs/p/10340609.html

1：master上查看token

[root@k8s-m ~]# kubeadm token list

　　

如果没有token信息，就重新生成一个，默认有效期1天

[root@k8s-m ~]# kubeadm token create

　　

2：新增的node节点操作

内核参数调整

vi /etc/sysctl.d/k8s.conf
net.bridge.bridge-nf-call-ip6tables = 1
net.bridge.bridge-nf-call-iptables = 1
net.ipv4.ip_forward = 1
vm.swappiness = 0

　　

刷新使修改生效

modprobe br_netfilter
sysctl -p /etc/sysctl.d/k8s.conf
swapoff -a

　

镜像准备

docker pull registry.cn-hangzhou.aliyuncs.com/google_containers/kube-proxy:v1.15.3
docker pull registry.cn-hangzhou.aliyuncs.com/mirror-suke/flannel:v0.11.0-amd64
docker pull registry.cn-hangzhou.aliyuncs.com/google_containers/pause:3.1
docker tag registry.cn-hangzhou.aliyuncs.com/google_containers/kube-proxy:v1.15.3 k8s.gcr.io/kube-proxy:v1.15.3
docker tag registry.cn-hangzhou.aliyuncs.com/mirror-suke/flannel:v0.11.0-amd64 quay.io/coreos/flannel:v0.11.0-amd64
docker tag registry.cn-hangzhou.aliyuncs.com/google_containers/pause:3.1 k8s.gcr.io/pause:3.1

　　

安装组件

cat > /etc/yum.repos.d/kubernetes.repo << EOF
[kubernetes]
name=Kubernetes
baseurl=https://mirrors.aliyun.com/kubernetes/yum/repos/kubernetes-el7-x86_64/
enabled=1
gpgcheck=0
EOF

　　

yum makecache fast && yum install -y kubelet kubeadm kubectl

　　

因master版本较低，到现在已更新到1.17，所以后面join的时候出现问题，版本过高

报错信息如下

W1213 17:44:30.998175   18956 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'
error execution phase preflight: unable to fetch the kubeadm-config ConfigMap: this version of kubeadm only supports deploying clusters with the control plane version >= 1.16.0. Current version: v1.15.3
To see the stack trace of this error execute with --v=5 or higher

　　

所以安装符合自己需求的版本

自行移除上面安装的最新的，如果join没事就忽略
yum remove -y kubelet kubeadm kubectl
安装符合自己环境的
查询版本
yum list --showduplicates | grep 'kubeadm\|kubectl\|kubelet'
安装
yum install kubeadm-1.15.0 kubectl-1.15.0 kubelet-1.15.0 --disableexcludes=kubernetes

　　

修改/etc/sysconfig/kubelet

KUBELET_EXTRA_ARGS=--fail-swap-on=false

　　

加入集群

systemctl enable kubelet.service && systemctl start kubelet.service
kubeadm join 172.16.10.241:6443 --token 5v5d9j.z70ausp24qhl1n7r \
    --discovery-token-ca-cert-hash sha256:d2b1c8ad8ea7d481240eb24088c41507c88ab6ff6cc087af77c437701bcfb958

　　

主节点验证

kubectl get node
kubectl get cs
kubectl get pod -n kube-system

测试集群DNS
kubectl run curl --image=radial/busyboxplus:curl -it