Docker + Consul 多数据中心模拟

Docker + Consul 多数据中心模拟

1. dc1搭建

docker run -d --name node1 -h node1 progrium/consul -server -bootstrap-expect 3
JOIN_IP="$(docker inspect -f '{{.NetworkSettings.IPAddress}}' node1)"
docker run -d --name node2 -h node2 progrium/consul -server -join $JOIN_IP
docker run -d --name node3 -h node3 progrium/consul -server -join $JOIN_IP
docker run -d -p 8400:8400 -p 8500:8500 -p 8600:53/udp --name node4 -h node4 progrium/consul -join $JOIN_IP

进入node1容器，执行命令 consul members，命令行展示结果如下：

e31c5329d0f6:/bin # ./consul members
Node     Address          Status  Type    Build  Protocol  DC
dc1-dc2  172.17.0.9:8301  alive   server  0.7.1  2         dc1
node1    172.17.0.2:8301  alive   server  0.5.2  2         dc1
node2    172.17.0.3:8301  alive   server  0.5.2  2         dc1
node3    172.17.0.4:8301  alive   server  0.5.2  2         dc1
node4    172.17.0.5:8301  alive   client  0.5.2  2         dc1

2. dc2 搭建

采用最新consul搭建(目前最新版为0.7.1)

./consul agent -server -bootstrap-expect 3 -node=dragon-server-root -datacenter=dc2 -data-dir=/data
./consul agent -server -node=dragon-server-two -datacenter=dc2 -data-dir=/data -join=172.17.0.6
./consul agent -server -node=dragon-server-three -datacenter=dc2 -data-dir=/data -join=172.17.0.6

进入node1容器，执行命令 consul members，命令行展示结果如下：

f1aff93c9d44:/bin # ./consul members
Node                 Address           Status  Type    Build  Protocol  DC
dragon-server-root   172.17.0.6:8301   alive   server  0.7.1  2         dc2
dragon-server-three  172.17.0.8:8301   alive   server  0.7.1  2         dc2
dragon-server-two    172.17.0.7:8301   alive   server  0.7.1  2         dc2

3. 多数据中心关联

前两节搭建了两个独立的数据中心，两个数据中心是独立的，相互之间并没有任何联系。

选取dragon-server-three 和 node1 为临界容器，进入dragon-server-three,执行命令：./consul join -wan 172.17.0.2。完成后，执行./consul members -wan

Node                     Address          Status  Type    Build  Protocol  DC
dc1-dc2.dc1              172.17.0.9:8302  alive   server  0.7.1  2         dc1
dragon-server-root.dc2   172.17.0.7:8302  alive   server  0.7.1  2         dc2
dragon-server-three.dc2  172.17.0.8:8302  alive   server  0.7.1  2         dc2
dragon-server-two.dc2    172.17.0.7:8302  alive   server  0.7.1  2         dc2
node1.dc1                172.17.0.2:8302  alive   server  0.5.2  2         dc1

至此两个数据中心已经发生联系。访问urlhttp://192.168.1.100:8500/ 可以看到两个数据中心dc1,dc2

4. 附录（shell脚本如下：）

docker run -d --name node1 -h node1 progrium/consul -server -bootstrap-expect 3

JOIN_IP="$(docker inspect -f '{{.NetworkSettings.IPAddress}}' node1)"
echo "node1:" $JOIN_IP
docker run -d --name node2 -h node2 progrium/consul -server -join $JOIN_IP

echo "node2:" $(docker inspect -f '{{.NetworkSettings.IPAddress}}' node2)

docker run -d --name node3 -h node3 progrium/consul -server -join $JOIN_IP

echo "node3:" $(docker inspect -f '{{.NetworkSettings.IPAddress}}' node3)

docker run -d -p 8400:8400 -p 8500:8500 -p 8600:53/udp --name node4 -h node4 progrium/consul -join $JOIN_IP

echo "node4:" $(docker inspect -f '{{.NetworkSettings.IPAddress}}' node4)

docker run --name dc1-dc2 -d --entrypoint /bin/consul opensuse-consul agent -node=dc1-dc2 -data-dir=/data -join=$JOIN_IP

echo "dc1-dc2:" $(docker inspect -f '{{.NetworkSettings.IPAddress}}' dc1-dc2)

docker run --name dragon-server-root -d --entrypoint /bin/consul opensuse-consul agent -server -bootstrap-expect 3 -node=dragon-server-root -datacenter=dc2 -data-dir=/data

JOIN_IP2="$(docker inspect -f '{{.NetworkSettings.IPAddress}}' dragon-server-root)"

echo "dragon-server-root:" $(docker inspect -f '{{.NetworkSettings.IPAddress}}' dragon-server-root)

echo $JOIN_IP2

docker run --name dragon-server-two -d --entrypoint /bin/consul opensuse-consul agent -server -node=dragon-server-two -datacenter=dc2 -data-dir=/data -join=$JOIN_IP2

echo "dragon-server-two:" $(docker inspect -f '{{.NetworkSettings.IPAddress}}' dragon-server-two)

docker run --name dragon-server-three -d --entrypoint /bin/consul opensuse-consul agent -server -node=dragon-server-three -datacenter=dc2 -data-dir=/data -join=$JOIN_IP2 

echo "dragon-server-three:" $(docker inspect -f '{{.NetworkSettings.IPAddress}}' dragon-server-three)

docker exec -it dragon-server-root /bin/consul join -wan $JOIN_IP
echo $?
docker exec -it dragon-server-two /bin/consul join -wan $JOIN_IP
echo $?
docker exec -it dragon-server-three /bin/consul join -wan $JOIN_IP
echo $?