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This document uses PHP Chinese website manual Release
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Docker沒有硬編碼服務(wù)使用者和提供者之間的網(wǎng)絡(luò)鏈接，而是鼓勵(lì)服務(wù)可移植性，例如：
(consumer) --> (redis)
需要重新啟動(dòng)consumer將它附加到另一個(gè)redis服務(wù)，您可以添加大使：
(consumer) --> (redis-ambassador) --> (redis)
或
(consumer) --> (redis-ambassador) ---network---> (redis-ambassador) --> (redis)
當(dāng)您需要重新連接您的使用者以與另一臺(tái)Redis服務(wù)器對(duì)話時(shí)，您可以重新啟動(dòng)redis-ambassador連接到的容器。
此模式還允許您透明地將Redis服務(wù)器移動(dòng)到與使用者不同的?？恐鳈C(jī)。
使用svendowideit/ambassador容器，則鏈接布線完全由docker run參數(shù)。
兩個(gè)主機(jī)示例
在一個(gè)Docker主機(jī)上啟動(dòng)實(shí)際的Redis服務(wù)器
big-server $ docker run -d --name redis crosbymichael/redis
然后添加鏈接到Redis服務(wù)器的大使，將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
在另一個(gè)主機(jī)上，您可以為我們要代理的每個(gè)遠(yuǎn)程端口設(shè)置另一個(gè)大使設(shè)置環(huán)境變量。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主機(jī)，您可以使用Redis客戶端容器與遠(yuǎn)程Redis服務(wù)器對(duì)話，只需鏈接到本地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
下面的示例顯示了svendowideit/ambassador容器自動(dòng)執(zhí)行%28，只需少量的sed%29
在Docker主機(jī)%28192.168.1.52%29上，Redis將在其上運(yùn)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，您可以看到鏈接的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
這個(gè)環(huán)境由大使使用。socat腳本將Redis公開給世界%28通過-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
現(xiàn)在通過大使平Redis服務(wù)器：
現(xiàn)在轉(zhuǎn)到另一個(gè)服務(wù)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這樣我們就可以在大使橋上談了。
$ 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
商業(yè)銀行/大使文件
大svendowideit/ambassador圖像是基于alpine:3.2圖像socat安裝好了。啟動(dòng)容器時(shí)，它使用一個(gè)小的sed腳本來解析%28，可能是多個(gè)%29鏈接環(huán)境變量來設(shè)置端口轉(zhuǎn)發(fā)。在遠(yuǎn)程主機(jī)上，需要使用-e命令行選項(xiàng)。
--expose 1234 -e REDIS_PORT_1234_TCP=tcp://192.168.1.52:6379
將當(dāng)?shù)?code>1234到遠(yuǎn)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