1.关闭防火墙

systemctl stop firewalld && systemctl disable firewalld

2.禁用selinux

setenforce 0

3.确认selinux是否修改为disabled

vi /etc/selinux/config

4.创建/etc/sysctl.conf

net.bridge.bridge-nf-call-ip6tables = 1
net.bridge.bridge-nf-call-iptables = 1
net.ipv4.ip_forward = 1

ipv6需要增加配置

net.ipv6.conf.all.disable_ipv6 = 0
net.ipv6.conf.default.disable_ipv6 = 0
net.ipv6.conf.lo.disable_ipv6 = 0
net.ipv6.conf.all.forwarding=1
net.bridge.bridge-nf-call-ip6tables = 1
net.bridge.bridge-nf-call-iptables = 1
net.ipv4.ip_forward = 1

proxy 使用 ipvs

cat > /etc/sysconfig/modules/ipvs.modules <<EOF
#!/bin/bash
ipvs_modules="ip_vs ip_vs_lc ip_vs_wlc ip_vs_rr ip_vs_wrr ip_vs_lblc ip_vs_lblcr ip_vs_dh ip_vs_sh ip_vs_nq ip_vs_sed ip_vs_ftp nf_conntrack_ipv4"
for kernel_module in \${ipvs_modules}; do
        /sbin/modprobe \${kernel_module}

done
EOF
chmod 755 /etc/sysconfig/modules/ipvs.modules && bash /etc/sysconfig/modules/ipvs.modules && lsmod | grep ip_vs

5.使命令4生效

modprobe br_netfilter
sysctl -p 

6.安装docker的yum源

yum install -y yum-utils device-mapper-persistent-data lvm2
yum-config-manager \
    --add-repo \
    https://download.docker.com/linux/centos/docker-ce.repo

7.安装docker,设置开机自启

yum makecache fast

yum install -y --setopt=obsoletes=0 \
  docker-ce-18.06.1.ce-3.el7

systemctl start docker
systemctl enable docker

8.安装的kubelet、kubectl、kubeadm源
阿里云：

cat <<EOF > /etc/yum.repos.d/kubernetes.repo
[kubernetes]

name=Kubernetes

baseurl=https://mirrors.aliyun.com/kubernetes/yum/repos/kubernetes-el7-x86_64/

gpgcheck=0

gpgkey=https://mirrors.aliyun.com/kubernetes/yum/doc/rpm-package-key.gpg

enabled=1
EOF

9.安装kubelet、kubectl、kubeadm

yum makecache fast
yum install -y kubernetes-cni-0.6.0-0.x86_64 kubelet-1.12.3 kubeadm-1.12.3 kubectl-1.12.3 //安装指定版本

10.关闭swap

swapoff -a

11.修改文件/etc/sysctl.d/k8s.conf添加vm.swappiness=0
12.kubelet开机启动

systemctl enable kubelet
systemctl start kubelet

13.拉取镜像
此时仅仅源为阿里云时需要拉镜像

docker pull mirrorgooglecontainers/kube-apiserver-amd64:v1.12.3
docker pull mirrorgooglecontainers/kube-controller-manager-amd64:v1.12.3
docker pull mirrorgooglecontainers/kube-scheduler-amd64:v1.12.3
docker pull mirrorgooglecontainers/kube-proxy-amd64:v1.12.3
docker pull mirrorgooglecontainers/pause-amd64:3.1
docker pull mirrorgooglecontainers/etcd-amd64:3.2.24
docker pull kuberneter/coredns:1.2.2
docker pull mirrorgooglecontainers/kubernetes-dashboard-amd64:v1.10.0



docker tag mirrorgooglecontainers/kube-apiserver-amd64:v1.12.3  k8s.gcr.io/kube-apiserver:v1.12.3
docker tag mirrorgooglecontainers/kube-controller-manager-amd64:v1.12.3 k8s.gcr.io/kube-controller-manager:v1.12.3
docker tag mirrorgooglecontainers/kube-scheduler-amd64:v1.12.3 k8s.gcr.io/kube-scheduler:v1.12.3
docker tag mirrorgooglecontainers/kube-proxy-amd64:v1.12.3 k8s.gcr.io/kube-proxy:v1.12.3
docker tag mirrorgooglecontainers/pause-amd64:3.1 k8s.gcr.io/pause:3.1
docker tag mirrorgooglecontainers/etcd-amd64:3.2.24 k8s.gcr.io/etcd:3.2.24
docker tag kuberneter/coredns:1.2.2 k8s.gcr.io/coredns:1.2.2
docker tag mirrorgooglecontainers/kubernetes-dashboard-amd64:v1.10.0 k8s.gcr.io/dashboard:v1.10.0



docker rmi mirrorgooglecontainers/kube-apiserver-amd64:v1.12.3
docker rmi mirrorgooglecontainers/kube-controller-manager-amd64:v1.12.3
docker rmi mirrorgooglecontainers/kube-scheduler-amd64:v1.12.3
docker rmi mirrorgooglecontainers/kube-proxy-amd64:v1.12.3
docker rmi mirrorgooglecontainers/pause-amd64:3.1
docker rmi mirrorgooglecontainers/etcd-amd64:3.2.24
docker rmi kuberneter/coredns:1.2.2
docker rmi mirrorgooglecontainers/kubernetes-dashboard-amd64:v1.10.0

14.初始化集群

kubeadm init --kubernetes-version=1.12.3 --pod-network-cidr=10.244.0.0/16 --apiserver-advertise-address=140.143.0.194

15.部署集群失败

kubeadm reset
ifconfig cni0 down
ip link delete cni0
ifconfig flannel.1 down
ip link delete flannel.1
rm -rf /var/lib/cni/

16.初始化显示成功
a.当前为root用户

echo "export KUBECONFIG=/etc/kubernetes/admin.conf" >> ~/.bash_profile
source ~/.bash_profile

b.当前为普通用户

mkdir -p $HOME/.kube
sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
sudo chown $(id -u):$(id -g) $HOME/.kube/config