etcd集群的搭建

Etcd构建自身高可用集群主要有三种形式:

静态发现: 预先已知 Etcd 集群中有哪些节点，在启动时直接指定好Etcd的各个node节点地址
Etcd动态发现: 通过已有的Etcd集群作为数据交互点，然后在扩展新的集群时实现通过已有集群进行服务发现的机制
DNS动态发现: 通过DNS查询方式获取其他节点地址信息
这里我们采用Static方式，准备三台机器，ip如下(都已经安装etcd)

node1 10.211.55.2
node2 10.211.55.25
node3 10.211.55.26

环境准备
1.在node1上执行

hostnamectl set-hostname node1
echo "10.211.55.2 node1">> /etc/hosts
echo "10.211.55.25 node2">> /etc/hosts
echo "10.211.55.26 node3">> /etc/hosts
systemctl stop firewalld
systemctl disable firewalld
setenforce 0

2.在node2上执行

hostnamectl set-hostname node2
echo "10.211.55.2 node1">> /etc/hosts
echo "10.211.55.25 node2">> /etc/hosts
echo "10.211.55.26 node3">> /etc/hosts
systemctl stop firewalld
systemctl disable firewalld
setenforce 0

3.在node3上执行

hostnamectl set-hostname node3
echo "10.211.55.2 node1">> /etc/hosts
echo 10.211.55.25 node2>> /etc/hosts
echo 10.211.55.26 node3>> /etc/hosts
systemctl stop firewalld
systemctl disable firewalld
setenforce 0

1.1进入node1，创建并运行run.sh,脚本内容如下

yum remove etcd -y
yum install etcd -y
mkdir /etcd
cd /etcd
touch run.sh
cat>/etcd/run.sh<<EOF
#!/usr/bin/env bash
#节点名称
ETCD_NAME=node-1
#本机IP地址
LOCAL_IP=10.211.55.2
#ETCD存储目录
ETCD_DATA_DIR=/usr/local/etcd/data
#初始化名称
INITIAL_CLUSTER_TOKEN=etcd-cluster
#初始化群集列表
INITIAL_CLUSTER="node-1=http://10.211.55.2:2380,node-2=http://10.211.55.25:2380,node-3=http://10.211.55.26:2380"
#初始化状态
INITIAL_CLUSTER_STATE=new

#开始运行
etcd --name \${ETCD_NAME} --data-dir \${ETCD_DATA_DIR} \
    --initial-advertise-peer-urls http://\${LOCAL_IP}:2380 \
    --listen-peer-urls http://\${LOCAL_IP}:2380 \
    --listen-client-urls http://\${LOCAL_IP}:2379,http://127.0.0.1:2379 \
    --advertise-client-urls http://\${LOCAL_IP}:2379 \
    --initial-cluster-token \${INITIAL_CLUSTER_TOKEN} \
    --initial-cluster \${INITIAL_CLUSTER} \
    --initial-cluster-state \${INITIAL_CLUSTER_STATE} 
EOF
nohup sh run.sh &
etcdctl member list

1.2进入node2，创建并运行run.sh,脚本内容如下

yum remove etcd -y
yum install etcd -y
mkdir /etcd
cd /etcd
touch run.sh
cat>/etcd/run.sh<<EOF
#!/usr/bin/env bash
#节点名称
ETCD_NAME=node-2
#本机IP地址
LOCAL_IP=10.211.55.25
#ETCD存储目录
ETCD_DATA_DIR=/usr/local/etcd/data
#初始化名称
INITIAL_CLUSTER_TOKEN=etcd-cluster
#初始化群集列表
INITIAL_CLUSTER="node-1=http://10.211.55.2:2380,node-2=http://10.211.55.25:2380,node-3=http://10.211.55.26:2380"
#初始化状态
INITIAL_CLUSTER_STATE=new

#开始运行
etcd --name \${ETCD_NAME} --data-dir \${ETCD_DATA_DIR} \
    --initial-advertise-peer-urls http://\${LOCAL_IP}:2380 \
    --listen-peer-urls http://\${LOCAL_IP}:2380 \
    --listen-client-urls http://\${LOCAL_IP}:2379,http://127.0.0.1:2379 \
    --advertise-client-urls http://\${LOCAL_IP}:2379 \
    --initial-cluster-token \${INITIAL_CLUSTER_TOKEN} \
    --initial-cluster \${INITIAL_CLUSTER} \
    --initial-cluster-state \${INITIAL_CLUSTER_STATE} 
EOF
nohup sh run.sh &
etcdctl member list

1.3进入node3，创建并运行run.sh,脚本内容如下

yum remove etcd -y
yum install etcd -y
mkdir /etcd
cd /etcd
touch run.sh
cat>/etcd/run.sh<<EOF
#!/usr/bin/env bash
#节点名称
ETCD_NAME=node-3
#本机IP地址
LOCAL_IP=10.211.55.26
#ETCD存储目录
ETCD_DATA_DIR=/usr/local/etcd/data
#初始化名称
INITIAL_CLUSTER_TOKEN=etcd-cluster
#初始化群集列表
INITIAL_CLUSTER="node-1=http://10.211.55.2:2380,node-2=http://10.211.55.25:2380,node-3=http://10.211.55.26:2380"
#初始化状态
INITIAL_CLUSTER_STATE=new

#开始运行
etcd --name \${ETCD_NAME} --data-dir \${ETCD_DATA_DIR} \
    --initial-advertise-peer-urls http://\${LOCAL_IP}:2380 \
    --listen-peer-urls http://\${LOCAL_IP}:2380 \
    --listen-client-urls http://\${LOCAL_IP}:2379,http://127.0.0.1:2379 \
    --advertise-client-urls http://\${LOCAL_IP}:2379 \
    --initial-cluster-token \${INITIAL_CLUSTER_TOKEN} \
    --initial-cluster \${INITIAL_CLUSTER} \
    --initial-cluster-state \${INITIAL_CLUSTER_STATE} 
EOF
nohup sh run.sh &
etcdctl member list

通过以上步骤就完成了etcd的配置

2.1搭建etcd web管理端

docker run --rm  -d --name etcd-browser \
-p 8000:8000 \
--env ETCD_HOST=10.211.55.25 \
--env ETCD_PORT=2379 \
buddho/etcd-browser

访问http://10.211.55.25:8080/etcdkeeper/，输入etcd的地址就成功了

2.2搭建etcdkeeper

docker run -it -d --name etcdkeeper \
-p 8080:8080 \
deltaprojects/etcdkeeper

访问http://10.211.55.25:8080/etcdkeeper/，输入etcd的地址就成功了