docker 容器間通訊(link)

docker的link是經過使用容器的ip地址來實現多容器之間通訊的。關於link在宿主主機網絡上的實現原理不在這裏介紹。

link格式

sudo docker run -ti --link container:alias images

測試

因爲redis自然的c/s結構和較小的體積，暫用redis測試

下載redis鏡像

suntopo@suntopo-X550VX:~$ sudo docker pull redis

建立redis容器

suntopo@suntopo-X550VX:~$ sudo docker run --name redis-server -d redis
bc569786abd83513f89fbe7f7fbfbd2198032337d08b995382d1abe180a2036e
suntopo@suntopo-X550VX:~$ sudo docker ps -a
CONTAINER ID        IMAGE               COMMAND                  CREATED             STATUS                   PORTS               NAMES
bc569786abd8        redis               "docker-entrypoint.sh"   25 seconds ago      Up 24 seconds            6379/tcp            redis-server
254938ab2e20        0d1cbfaa41da        "docker-entrypoint.sh"   4 weeks ago         Exited (0) 6 days ago                        zen_murdock
0a1a11d5263b        mongo               "/entrypoint.sh mongo"   5 weeks ago         Exited (0) 13 days ago                       berserk_ride

進入redis容器

suntopo@suntopo-X550VX:~$ sudo docker exec -it redis-server /bin/bash
root@bc569786abd8:/data# redis-cli
127.0.0.1:6379> set name suntopo
OK
127.0.0.1:6379> get name 
"suntopo"
127.0.0.1:6379>

使用link鏈接容器

suntopo@suntopo-X550VX:~$ sudo docker run -ti --link redis-server:redis-server redis /bin/bash
root@a032da74b250:/data# env
REDIS_SERVER_ENV_REDIS_VERSION=3.2.4
HOSTNAME=a032da74b250
REDIS_SERVER_PORT_6379_TCP_PORT=6379
REDIS_DOWNLOAD_URL=http://download.redis.io/releases/redis-3.2.4.tar.gz
TERM=xterm
REDIS_SERVER_PORT_6379_TCP_PROTO=tcp
REDIS_SERVER_ENV_REDIS_DOWNLOAD_URL=http://download.redis.io/releases/redis-3.2.4.tar.gz
REDIS_SERVER_PORT=tcp://172.17.0.2:6379
PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
REDIS_SERVER_ENV_REDIS_DOWNLOAD_SHA1=f0fe685cbfdb8c2d8c74613ad8a5a5f33fba40c9
PWD=/data
REDIS_SERVER_ENV_GOSU_VERSION=1.7
SHLVL=1
HOME=/root
REDIS_VERSION=3.2.4
REDIS_DOWNLOAD_SHA1=f0fe685cbfdb8c2d8c74613ad8a5a5f33fba40c9
REDIS_SERVER_PORT_6379_TCP=tcp://172.17.0.2:6379
REDIS_SERVER_NAME=/evil_fermat/redis-server
GOSU_VERSION=1.7
REDIS_SERVER_PORT_6379_TCP_ADDR=172.17.0.2
_=/usr/bin/env
root@a032da74b250:/data# ^C
root@a032da74b250:/data# redis-cli -h $REDIS_SERVER_PORT_6379_TCP_ADDR
172.17.0.2:6379> get name
"suntopo"
172.17.0.2:6379>

注: 環境變量的前綴就是用alias大寫命名的。