1.关闭防火墙：

systemctl stop firewalld && systemctl disable firewalld

2.etcd安装

rm -rf /tmp/etcd-data.tmp && mkdir -p /tmp/etcd-data.tmp && \
  docker run -d \
  --restart=always \
  -p 2379:2379 \
  -p 2380:2380 \
  --mount type=bind,source=/tmp/etcd-data.tmp,destination=/etcd-data \
  --name etcd-gcr-v3.3.13 \
  gcr.io/etcd-development/etcd:v3.3.13 \
  /usr/local/bin/etcd \
  --name s1 \
  --data-dir /etcd-data \
  --listen-client-urls http://0.0.0.0:2379 \
  --advertise-client-urls http://0.0.0.0:2379 \
  --listen-peer-urls http://0.0.0.0:2380 \
  --initial-advertise-peer-urls http://0.0.0.0:2380 \
  --initial-cluster s1=http://0.0.0.0:2380 \
  --initial-cluster-token tkn \
  --initial-cluster-state new

或者

yum -y install etcd 
修改/etc/etcd/etcd.conf   中的IP为   0.0.0.0
systemctl start etcd  && systemctl enable etcd

验证etcd状态：

ETCDCTL_API=3 /usr/local/bin/etcdctl endpoint health

3.创建FLANNEL_ETCD_PREFIX,与/etc/sysconfig/flanneld中的FLANNEL_ETCD_PREFIX对应一致，如：

FLANNEL_ETCD_PREFIX="/atomic.io/network"
etcdctl mk /atomic.io/network/config '{"Network":"172.11.0.0/16", "SubnetMin": "172.11.1.0", "SubnetMax": "172.11.254.0", "Backend":{"Type":"vxlan"}}'

4.安装flannel

yum -y install flannel

5.修改/etc/sysconfig/flanneld，填写etcd ip

FLANNEL_ETCD_ENDPOINTS="http://192.168.1.147:2379"

6.启动flannel

systemctl start flanneld && systemctl enable flanneld

7.安装docker,

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

配置/usr/lib/systemd/system/docker.service，在ExecStart后面加上：
$DOCKER_NETWORK_OPTIONS,如：

ExecStart=/usr/bin/dockerd -H fd:// --containerd=/run/containerd/containerd.sock --insecure-registry 192.168.1.74:80 $DOCKER_NETWORK_OPTIONS

启动docker：

systemctl daemon-reload && systemctl restart docker

由于iptables规则问题可能出现docker0到docker网络不通，查看iptables规则

iptables -nvL
显示：
Chain FORWARD (policy DROP 3161 packets, 266K bytes)

修改iptables规则

iptables -P FORWARD ACCEPT