centos7环境下部署k8s

环境配置

系统：CentOS Linux release 7.8.2003
配置：4C4G
k8s-1：192.168.31.200
k8s-2：192.168.31.201
k8s-3：192.168.31.202
k8s-4：192.168.31.203

步骤一：关闭防火墙、selinux、swap、修改host

# 关闭防火墙
systemctl stop firewalld
systemctl disable firewalld
# 关闭selinux
sed -i 's#SELINUX=enforcing#SELINUX=disabled#g'  /etc/selinux/config
setenforce 0
# 关闭swap
swapoff -a
sed -ri 's/.*swap.*/#&/' /etc/fstab
#修改hosts
cat <<EOF>> /etc/hosts
192.168.31.200 k8s-1
192.168.31.201 k8s-2
192.168.31.202 k8s-3
192.168.31.203 k8s-4
EOF

步骤二：安装docker

wget http://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo -O /etc/yum.repos.d/docker-ce.repo
yum install docker-ce -y
#docker加速
mkdir /etc/docker
tee /etc/docker/daemon.json <<-'EOF'
{
  "registry-mirrors": ["https://p1qim8sk.mirror.aliyuncs.com"]
}
EOF
#启动docker
systemctl daemon-reload
systemctl start  docker
systemctl enable docker

步骤三：安装kubernetes

#添加yum源
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
#有索引gpg检查失败的情况, 这时请用 yum install -y --nogpgcheck kubelet kubeadm kubectl 安装
yum install -y kubelet kubeadm kubectl
systemctl enable kubelet && systemctl start kubelet

步骤四：初始化master节点

kubeadm init --image-repository registry.aliyuncs.com/google_containers   --apiserver-advertise-address 192.168.31.200 --pod-network-cidr=10.254.254.0/24
 mkdir -p $HOME/.kube
  sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
  sudo chown $(id -u):$(id -g) $HOME/.kube/config

步骤五：node节点加入集群

kubeadm join 192.168.31.200:6443 --token 9zjgia.whekz6r4atnmceq3 --discovery-token-ca-cert-hash sha256:1cd9a718b27b4aeddcccb3c450f0912a6d66bd89e6cc72e7ab3b77ef9f292b9d 
mkdir -p /root/.kube
sudo scp [email protected]:/etc/kubernetes/admin.conf /root/.kube/config
sudo chown $(id -u):$(id -g) /root/.kube/config

步骤六：建立pod网络

kubectl apply -f https://raw.githubusercontent.com/coreos/flannel/master/Documentation/kube-flannel.yml

步骤七：集群验证

[[email protected] ~]#kubectl get nodes
NAME    STATUS   ROLES    AGE     VERSION
k8s-1   Ready    master   3m1s    v1.19.1
k8s-2   Ready    <none>   2m32s   v1.19.1
k8s-3   Ready    <none>   103s    v1.19.1
k8s-4   Ready    <none>   102s    v1.19.1

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