在docker容器中自动运行服务 [英] Run a service automatically in a docker container

问题描述

我正在设置一个简单的图像：一个保存Riak（一个NoSQL数据库）的图像。图像以code> riak start 作为CMD启动Riak服务。现在，如果我使用 docker run -d quintenk / riak-dev 作为守护进程运行它，那么它会启动Riak进程（我可以在日志中看到）。但是，它会在几秒钟后自动关闭。如果我使用 docker run -i -t quintenk / riak-dev / bin / bash 运行它，则riak进程不会启动（更新：请参阅有关此解释的答案） 。实际上，根本没有服务运行。我可以使用终端手动启动它，但是我希望Riak自动启动。我认为这个行为会发生在其他服务上，Riak只是一个例子。

所以，运行/重新启动容器应该会自动启动Riak。

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为了参考，这里是可以创建图像的Docker文件（更新：使用所选答案更改）：

  FROM ubuntu：12.04 
 RUN apt-get update 
运行apt-get install -y openssh-server curl 
运行curl http://apt.basho.com/gpg/basho.apt.key | apt-key add  -  
 RUN bash -cecho deb http://apt.basho.com precise main> /etc/apt/sources.list.d/basho.list
 RUN apt -get update 
运行apt-get -y安装riak 
运行perl -p -i -e的/（？< = \ {http，\s\ [\s\\ \\ {）127\.0\.0\.1 / 0.0.0.0 / g'/etc/riak/app.config 
 EXPOSE 8098 
 CMD / bin / riak start& & tail -F /var/log/riak/erlang.log.1 
  

编辑：-f根据sesm的说法，在CMD中更改为-F。

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MY OWN ANSWER

在Docker工作了一段时间后，我收到了使用supervisord来调用我的进程的习惯，如果你想要代码示例，请查看 https://github.com/Krijger/docker-cookbooks 我使用我的主管形象作为我所有其他图像的基础我使用主管a href =http://blog.trifork.com/2014/03/11/using-supervisor-with-do cker-to-manage-processes-supporting-image-inheritance /rel =noreferrer> here 。

解决方案

p>为了保持Docker容器运行，您需要在前台保持进程的活动。

所以你可能用Dockerfile中的最后一行替换为

  CMD / bin / riak控制台
  

甚至

  CMD / bin / riak start&& tail -F /var/log/riak/erlang.log.1 
  

请注意，你不能有多行CMD语句，只有最后一个运行。

I'm setting up a simple image: one that holds Riak (a NoSQL database). The image starts the Riak service with riak start as a CMD. Now, if I run it as a daemon with docker run -d quintenk/riak-dev, it does start the Riak process (I can see that in the logs). However, it closes automatically after a few seconds. If I run it using docker run -i -t quintenk/riak-dev /bin/bash the riak process is not started (UPDATE: see answers for an explanation for this). In fact, no services are running at all. I can start it manually using the terminal, but I would like Riak to start automatically. I figure this behavior would occur for other services as well, Riak is just an example.

So, running/restarting the container should automatically start Riak. What is the correct approach of setting this up?

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For reference, here is the Dockerfile with which the image can be created (UPDATE: altered using the chosen answer):

FROM ubuntu:12.04
RUN apt-get update
RUN apt-get install -y openssh-server curl 
RUN curl http://apt.basho.com/gpg/basho.apt.key | apt-key add -
RUN bash -c "echo deb http://apt.basho.com precise main > /etc/apt/sources.list.d/basho.list"
RUN apt-get update
RUN apt-get -y install riak
RUN perl -p -i -e 's/(?<=\{http,\s\[\s\{")127\.0\.0\.1/0.0.0.0/g' /etc/riak/app.config
EXPOSE 8098 
CMD /bin/riak start && tail -F /var/log/riak/erlang.log.1

EDIT: -f changed to -F in CMD in accordance to sesm his remark

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MY OWN ANSWER

After working with Docker for some time I picked up the habit of using supervisord to tun my processes. If you would like example code for that, check out https://github.com/Krijger/docker-cookbooks. I use my supervisor image as a base for all my other images. I blogged on using supervisor here.

解决方案

To keep docker containers running, you need to keep a process active in the foreground.

So you could probably replace that last line in your Dockerfile with

CMD /bin/riak console

Or even

CMD /bin/riak start && tail -F /var/log/riak/erlang.log.1

Note that you can't have multiple lines of CMD statements, only the last one gets run.

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