創(chuàng)建一個overlay驅(qū)動的網(wǎng)絡(luò)

docker network create -d overlay wordpress
[vagrant@swarm-manager ~]$ docker network ls
NETWORK ID NAME DRIVER SCOPE
q3rp3i79eud7 wordpress overlay swarm

創(chuàng)建mysql容器

docker service create --name mysql --env MYSQL_ROOT_PASSWORD=root --env MYSQL_DATABASE=wordpress --network wordpress --mount type=volume,source=mysql-data,destination=/var/lib/mysql mysql

創(chuàng)建wordpress

docker service create --name wordpress -p 80:80 --env WORDPRESS_DB_PASSWORD=root --env WORDPRESS_DB_HOST=mysql --network wordpress wordpress

查看節(jié)點分布

# 服務(wù)列表
[vagrant@swarm-manager ~]$ docker service ls
ID NAME MODE REPLICAS IMAGE PORTS
vxz0bfmul9th mysql replicated 1/1 mysql:5.7.22
cpe3wqrsoqxi wordpress replicated 1/1 wordpress:latest *:80->80/tcp
# wordpress服務(wù)的節(jié)點分布
[vagrant@swarm-manager ~]$ docker service ps wordpress
ID NAME IMAGE NODE DESIRED STATE CURRENT STATE ERROR PORTS
tnh4f0ldyidl wordpress.1 wordpress:latest swarm-manager Running Running 4 minutes ago
# mysql服務(wù)的節(jié)點分布
[vagrant@swarm-manager ~]$ docker service ps mysql
ID NAME IMAGE NODE DESIRED STATE CURRENT STATE ERROR PORTS
jns8bllzbz94 mysql.1 mysql:5.7.22 swarm-work1 Running Running 33 minutes ago

雖然wordpress只分布在了swarm-manager（192.168.205.10）這一個節(jié)點上，但是我們發(fā)現(xiàn)使用如下鏈接訪問，效果都是一樣的，是不是很神奇。具體原因詳見7.6

http://192.168.205.10/
http://192.168.205.11/
http://192.168.205.12/

在 swarm 模式下，無需安裝etcd，swarm會自動幫我們維護好分布式的overlay網(wǎng)絡(luò)