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personnages
Docker没有硬编码服务使用者和提供者之间的网络链接，而是鼓励服务可移植性，例如：
(consumer) --> (redis)
需要重新启动consumer将它附加到另一个redis服务，您可以添加大使：
(consumer) --> (redis-ambassador) --> (redis)
或
(consumer) --> (redis-ambassador) ---network---> (redis-ambassador) --> (redis)
当您需要重新连接您的使用者以与另一台Redis服务器对话时，您可以重新启动redis-ambassador连接到的容器。
此模式还允许您透明地将Redis服务器移动到与使用者不同的停靠主机。
使用svendowideit/ambassador容器，则链接布线完全由docker run参数。
两个主机示例
在一个Docker主机上启动实际的Redis服务器
big-server $ docker run -d --name redis crosbymichael/redis
然后添加链接到Redis服务器的大使，将端口映射到外部世界。
big-server $ docker run -d --link redis:redis --name redis_ambassador -p 6379:6379 svendowideit/ambassador
在另一个主机上，您可以为我们要代理的每个远程端口设置另一个大使设置环境变量。big-server
client-server $ docker run -d --name redis_ambassador --expose 6379 -e REDIS_PORT_6379_TCP=tcp://192.168.1.52:6379 svendowideit/ambassador
然后在client-server主机，您可以使用Redis客户端容器与远程Redis服务器对话，只需链接到本地Redis大使即可。
client-server $ docker run -i -t --rm --link redis_ambassador:redis relateiq/redis-cli redis 172.17.0.160:6379> ping PONG
它是如何工作的
下面的示例显示了svendowideit/ambassador容器自动执行%28，只需少量的sed%29
在Docker主机%28192.168.1.52%29上，Redis将在其上运行：
# start actual redis server $ docker run -d --name redis crosbymichael/redis # get a redis-cli image for connection testing $ docker pull relateiq/redis-cli # test the redis server by talking to it directly $ docker run -t -i --rm --link redis:redis relateiq/redis-cli redis 172.17.0.136:6379> ping PONG^D # add redis ambassador $ docker run -t -i --link redis:redis --name redis_ambassador -p 6379:6379 alpine:3.2 sh
在redis_ambassador容器，您可以看到链接的Redis容器。env*
/ # env REDIS_PORT=tcp://172.17.0.136:6379REDIS_PORT_6379_TCP_ADDR=172.17.0.136REDIS_NAME=/redis_ambassador/redis HOSTNAME=19d7adf4705e SHLVL=1HOME=/root REDIS_PORT_6379_TCP_PORT=6379REDIS_PORT_6379_TCP_PROTO=tcp REDIS_PORT_6379_TCP=tcp://172.17.0.136:6379TERM=xterm PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin PWD=// # exit
这个环境由大使使用。socat脚本将Redis公开给世界%28通过-p 6379:6379端口映射%29：
$ docker rm redis_ambassador $ CMD="apk update && apk add socat && sh"$ docker run -t -i --link redis:redis --name redis_ambassador -p 6379:6379 alpine:3.2 sh -c "$CMD"[...]/ # socat -t 100000000 TCP4-LISTEN:6379,fork,reuseaddr TCP4:172.17.0.136:6379
现在通过大使平Redis服务器：
现在转到另一个服务器：
$ CMD="apk update && apk add socat && sh"$ docker run -t -i --expose 6379 --name redis_ambassador alpine:3.2 sh -c "$CMD"[...]/ # socat -t 100000000 TCP4-LISTEN:6379,fork,reuseaddr TCP4:192.168.1.52:6379
得到redis-cli这样我们就可以在大使桥上谈了。
$ docker pull relateiq/redis-cli $ docker run -i -t --rm --link redis_ambassador:redis relateiq/redis-cli redis 172.17.0.160:6379> ping PONG
商业银行/大使文件
大svendowideit/ambassador图像是基于alpine:3.2图像socat安装好了。启动容器时，它使用一个小的sed脚本来解析%28，可能是多个%29链接环境变量来设置端口转发。在远程主机上，需要使用-e命令行选项。
--expose 1234 -e REDIS_PORT_1234_TCP=tcp://192.168.1.52:6379
将当地1234到远程IP和端口的端口，在本例中192.168.1.52:6379...
# # do# docker build -t svendowideit/ambassador .# then to run it (on the host that has the real backend on it)# docker run -t -i -link redis:redis -name redis_ambassador -p 6379:6379 svendowideit/ambassador # on the remote host, you can set up another ambassador # docker run -t -i -name redis_ambassador -expose 6379 -e REDIS_PORT_6379_TCP=tcp://192.168.1.52:6379 svendowideit/ambassador sh # you can read more about this process at https://docs.docker.com/articles/ambassador_pattern_linking/# use alpine because its a minimal image with a package manager.# prettymuch all that is needed is a container that has a functioning env and socat (or equivalent)FROM alpine:3.2RUN apk update && \ apk add socat && \ rm -r /var/cache/CMD env | grep _TCP= | (sed 's/.*_PORT_\([0-9]*\)_TCP=tcp:\/\/\(.*\):\(.*\)/socat -t 100000000 TCP4-LISTEN:\1,fork,reuseaddr TCP4:\2:\3 \&/' && echo wait) | sh