准备环境：
3台机器
一、环境初始化
1）修改 /etc/sysctl.conf
将桥接的IPv4流量传递到iptables的链
cat > /etc/sysctl.conf << EFO net.ipv4.ip_forward = 1 net.bridge.bridge-nf-call-ip6tables = 1 net.bridge.bridge-nf-call-iptables = 1 EFO
1 cat > /etc/sysctl.conf << EFO 2 net.ipv4.ip_forward = 1 3 net.bridge.bridge-nf-call-ip6tables = 1 4 net.bridge.bridge-nf-call-iptables = 1 5 EFO
生效
sysctl -p /etc/sysctl.conf
2）关闭防火墙 关闭selinux 关闭swap
swapoff -a && sed -ri 's/.*swap.*/#&/' /etc/fstab
sed -i 's/enforcing/disabled/' /etc/selinux/config && setenforce 0
sed -i 's/enforcing/disabled/' /etc/selinux/config && setenforce 0
systemctl stop firewalld && systemctl disable firewalld
sed -i 's/enforcing/disabled/' /etc/selinux/config && setenforce 0
swapoff -a && sed -ri 's/.*swap.*/#&/' /etc/fstab
3) 时间同步
yum install ntpdate -y ntpdate ntp1.aliyun.com date -R #查看新时间是否已同步
二、先为所有机器安装好docker
1、移除以前docker相关包
sudo yum remove docker \
docker-client \
docker-client-latest \
docker-common \
docker-latest \
docker-latest-logrotate \
docker-logrotate \
docker-engine
2、配置yum源
sudo yum install -y yum-utils sudo yum-config-manager \ --add-repo \ http://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo
3、安装docker
sudo yum install -y docker-ce docker-ce-cli containerd.io #以下是在安装k8s的时候使用 yum install -y docker-ce-20.10.8 docker-ce-cli-20.10.8 containerd.io-1.4.10
4、启动并配置加速
systemctl enable docker --now
sudo mkdir -p /etc/docker
sudo tee /etc/docker/daemon.json <<-'EOF'
{
"registry-mirrors": ["https://82m9ar63.mirror.aliyuncs.com"],
"exec-opts": ["native.cgroupdriver=systemd"],
"log-driver": "json-file",
"log-opts": {
"max-size": "100m"
},
"storage-driver": "overlay2"
}
EOF
sudo systemctl daemon-reload
sudo systemctl restart docker