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Add the container chapter
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container/daemon.md
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container/daemon.md
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##守护态运行
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更多的时候,需要让Docker容器在后台以守护态(Daemonized)形式运行。此时,可以通过添加`-d`参数来实现。
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例如下面的命令会在后台运行容器。
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```
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$ sudo docker run -d ubuntu:14.04 /bin/sh -c "while true; do echo hello world; sleep 1; done"
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1e5535038e285177d5214659a068137486f96ee5c2e85a4ac52dc83f2ebe4147
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```
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容器启动后会返回一个唯一的id,也可以通过`docker ps`命令来查看容器信息。
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```
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$ sudo docker ps
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CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
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1e5535038e28 ubuntu:14.04 /bin/sh -c 'while tr 2 minutes ago Up 1 minute insane_babbage
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```
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要获取容器的输出信息,可以通过`docker logs`命令。
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```
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$ sudo docker logs insane_babbage
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hello world
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hello world
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hello world
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. . .
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```
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