Docker service behind proxy - Ubuntu

編輯 /etc/default/docker
把以下 export http_proxy 的那一行 unmark, 然後改成你的 proxy 設定 

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# Docker Upstart and SysVinit configuration file
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# Customize location of Docker binary (especially for development testing).
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#DOCKER="/usr/local/bin/docker"
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# Use DOCKER_OPTS to modify the daemon startup options.
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#DOCKER_OPTS="--dns 8.8.8.8 --dns 8.8.4.4"
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# If you need Docker to use an HTTP proxy, it can also be specified here.
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export http_proxy="http://127.0.0.1:3128/"
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# This is also a handy place to tweak where Docker's temporary files go.
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#export TMPDIR="/mnt/bigdrive/docker-tmp"

重新啟動 docker service --- service docker restart

(如果你安裝的是 ubuntu 預設的 docker.io，指令就是 service docker.io restart)