kubeadm安装k8s Master

echo "关闭selinux"
sed -i 's/enforcing/disabled/' /etc/selinux/config

echo "关闭swap"
swapoff -a

echo "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 --system
#iptables转发

cat >/etc/sysctl.conf <<EOF
net.ipv4.ip_forward = 1
EOF

sysctl -p

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-20.10.5

systemctl enable docker
systemctl start docker

mkdir -p /data/docker
mkdir -p /etc/docker
cat >/etc/docker/daemon.json <<EOF
{
"exec-opts": ["native.cgroupdriver=systemd"],
"graph": "/data/docker"
}
EOF

systemctl daemon-reload
systemctl restart docker

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

echo "安装指定版本的kubex组件"
yum install -y --nogpgcheck kubelet-1.20.6 kubeadm-1.20.6 kubectl-1.20.6

systemctl enable kubelet

echo "初始化master节点，kubernetes-version要和安装的kubeadm kubelet 版本对应;apiserver-advertise-address要改成mastaer机器内网IP"
kubeadm init \
  --apiserver-advertise-address=172.16.3.40 \
  --image-repository registry.aliyuncs.com/google_containers \
  --kubernetes-version v1.20.6 \
  --service-cidr=10.1.0.0/16 \
  --pod-network-cidr=10.244.0.0/16


echo "init 完成没问题后渲染本地kubeconfig"
mkdir -p $HOME/.kube
cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
chown $(id -u):$(id -g) $HOME/.kube/config

echo "验证集群初始化成功"

kubectl get node

echo "安装flannel网络插件"
kubectl apply -f https://raw.githubusercontent.com/flannel-io/flannel/master/Documentation/kube-flannel.yml


echo "重新打印加入集群的join命令"
kubeadm token create --print-join-command