kubeadmin安装最新版本的kubenets

系统设置

CentOS Linux release 7.6.1810 (Core)

设置本地解析

vim /etc/hosts 172.16.227.40 k8s-master

关闭及禁用防火墙

systemctl disable firewalld

systemctl stop firewalld

关闭selinux

sed -i s/SELINUX=enforcing/SELINUX=disabled/g /etc/selinux/config

设置启动参数

cat <<EOF >  /etc/sysctl.d/k8s.conf
net.bridge.bridge-nf-call-ip6tables = 1
net.bridge.bridge-nf-call-iptables = 1
EOF

sysctl --system

安装docker，kubeadm, kubelet and kubectl

安装docker

yum install -y yum-utils device-mapper-persistent-data lvm2

yum-config-manager --add-repo https://download.docker.com/linux/centos/docker-ce.repo

yum list docker-ce --showduplicates | sort -r

yum install docker

systemctl start docker systemctl enable docker

kubeadm, kubelet and kubectl

cat <<EOF > /etc/yum.repos.d/kubernetes.repo
[kubernetes]
name=Kubernetes
baseurl=https://mirrors.aliyun.com/kubernetes/yum/repos/kubernetes-el7-x86_64/
enabled=1
gpgcheck=1
repo_gpgcheck=1
gpgkey=https://mirrors.aliyun.com/kubernetes/yum/doc/yum-key.gpg https://mirrors.aliyun.com/kubernetes/yum/doc/rpm-package-key.gpg
EOF

yum install -y kubelet kubeadm kubectl

systemctl enable kubelet && systemctl start kubelet

# 添加--image-repository参数，默认镜像下载会失败，

kubernetes-version与上面安装的kubelet版本对应一样

kubeadm init --kubernetes-version=???. --pod-network-cidr=10.244.0.0/16 --image-repository registry.aliyuncs.com/google_containers

设置kubectl命令

mkdir -p $HOME/.kube

sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config

sudo chown $(id -u):$(id -g) $HOME/.kube/config

安装pod network

wget https://raw.githubusercontent.com/coreos/flannel/master/Documentation/kube-flannel.yml

kubectl apply -f  kube-flannel.yml

执行上面命令出错时提示如下：

The connection to the server localhost:8080 was refused - did you specify the right host or port?

解决办法：

配置kubenetes的flannel网络的时候，出现以下报错

The connection to the server localhost:8080 was refused - did you specify the right host or port?

原因：kubenetes master没有与本机绑定，集群初始化的时候没有设置

解决办法：执行以下命令   export KUBECONFIG=/etc/kubernetes/admin.conf

/etc/kubernetes/admin.conf这个文件主要是集群初始化的时候用来传递参数的

这样默认安装好只有一个master节点
要想在主节点运行pods，还需要

5.0/1 nodes are available: 1 node(s) had taints that the pod didn't tolerate.

解决方法是安装flannel

有时候一个pod创建之后一直是pending，没有日志，也没有pull镜像，describe的时候发现里面有一句话： 1 node(s) had taints that the pod didn't tolerate.

直译意思是节点有了污点无法容忍，执行 kubectl get no -o yaml | grep taint -A 5 之后发现该节点是不可调度的。这是因为kubernetes出于安全考虑默认情况下无法在master节点上部署pod，于是用下面方法解决：

kubectl taint nodes --all node-role.kubernetes.io/master-


新节点加入k8s集群
重复以上步骤，安装docker kubelet kubeadm kubectl
注意，node节点的kubelet这些版本要与master节点的版本相同
不用安装kube-flannel.yml，因为node节点加入集群后，会自动拉镜像安装
注意，k8s的master通过init初始化后，生成的token会24小时后失效，要重新生成
https://blog.csdn.net/wo18237095579/article/details/89884369
https://www.cnblogs.com/histyle/p/10897163.html