使用kubeadm部署k8s 1.18版本

10.29.64.48 m1-48  master
10.29.64.49 m1-49  node
10.29.64.50 m1-50  node

# 关闭防火墙
systemctl stop firewalld
systemctl disable firewalld


# 关闭selinux
sed -i 's/enforcing/disabled/' /etc/selinux/config  # 永久
setenforce 0  # 临时


# 关闭swap
swapoff -a  # 临时
sed -ri 's/.*swap.*/#&/' /etc/fstab    # 永久


# 将桥接的IPv4流量传递到iptables的链
cat > /etc/sysctl.d/k8s.conf << EOF
net.bridge.bridge-nf-call-ip6tables = 1
net.bridge.bridge-nf-call-iptables = 1
EOF
sysctl -p # 生效

# 时间同步
yum install ntpdate -y


# 根据规划设置主机名 
hostnamectl set-hostname m1-48
hostnamectl set-hostname m2-49
hostnamectl set-hostname m3-50

# 注意：在master添加hosts
cat >> /etc/hosts << EOF
10.29.64.48 m1-48
10.29.64.49 m1-49
10.29.64.50 m1-50
10.29.64.48 api.k8s-test.com
10.29.64.48 api.rancer-test.com
EOF

wget https://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo -O /etc/yum.repos.d/docker-ce.repo 
yum -y install docker-ce-18.06.1.ce-3.el7

sed -i '3i ,\"exec-opts\": [\"native.cgroupdriver=systemd\"]' /etc/docker/daemon.json
systemctl restart docker

systemctl enable docker && systemctl start 
docker --version

cat > /etc/docker/daemon.json << EOF
{
  "registry-mirrors": ["https://b9pmyelo.mirror.aliyuncs.com"]
}
EOF

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
repo_gpgcheck=0
gpgkey=https://mirrors.aliyun.com/kubernetes/yum/doc/yum-key.gpg https://mirrors.aliyun.com/kubernetes/yum/doc/rpm-package-key.gpg
EOF

重启docker
systemctl restart docker
systemctl enable docker

rpm -Uvh http://www.elrepo.org/elrepo-release-7.0-3.el7.elrepo.noarch.rpm
#安装完成后检查 /boot/grub2/grub.cfg中对应内核menuentry中是否包含initrd16配置，如果没有，再安装一次

yum --enablerepo=elrepo-kernel install -y kernel-lt

#设置开机从新内核启动
grub2-set-default 'CentOS Linux (4.4.189-1.el7.elrepo.x86_64) 7 (Core)'

#重启机器
reboot

yum install -y kubelet-1.18.0 kubeadm-1.18.0 kubectl-1.18.0
systemctl enable kubelet
systemctl restart kubelet

# 安装其他版本使用的命令
#yum -y install kubeadm-1.23.4 kubectl-1.23.4 kubelet-1.23.4
#yum -y install kubeadm-1.26.3 kubectl-1.26.3 kubelet-1.26.3

kubeadm config print init-defaults > kubeadm-config.1.18.yaml　　#将初始化文件打印至目标文件

apiVersion: kubeadm.k8s.io/v1beta2
bootstrapTokens:
- groups:
  - system:bootstrappers:kubeadm:default-node-token
  token: abcdef.0123456789abcdef
  ttl: 24h0m0s
  usages:
  - signing
  - authentication
kind: InitConfiguration
localAPIEndpoint:
  advertiseAddress: 10.29.64.48  #修改apiserver地址，写master主机的IP
  bindPort: 6443
nodeRegistration:
  criSocket: /var/run/dockershim.sock
  name: m1-48
  taints:
  - effect: NoSchedule
    key: node-role.kubernetes.io/master
---
apiServer:
  timeoutForControlPlane: 4m0s
apiVersion: kubeadm.k8s.io/v1beta2
certificatesDir: /etc/kubernetes/pki
clusterName: kubernetes
controllerManager: {}
dns:
  type: CoreDNS
etcd:
  local:
    dataDir: /var/lib/etcd
imageRepository: registry.cn-hangzhou.aliyuncs.com/google_containers  #修改为国内仓库地址
kind: ClusterConfiguration
kubernetesVersion: v1.18.0
networking:
  dnsDomain: cluster.local
  serviceSubnet: 10.29.91.0/24  #集群部署后，可以在/etc/kubernetes/manifests/kube-controller-manager.yaml中查看-cluster-cidr字段
  podSubnet: 10.29.90.0/24 #集群部署后，可以在/etc/kubernetes/manifests/kube-apiserver.yaml中查看，service-cluster-ip-range字段
scheduler: {}

kubeadm init --config=kubeadm-config.1.18.yaml  | tee kubeadm-init.log
 
# 执行完成后，会给出kubeadm join提示，可以分别加入其他master节点和node节点，两个命令的区别是 --control-plane 参数
# kubeadm reset 恢复初始状态,可以直接剔掉一个master节点

mkdir -p $HOME/.kube
sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
sudo chown $(id -u):$(id -g) $HOME/.kube/config
kubectl get nodes
kubectl get pods -n kube-system