Docker多个入口点 [英] Docker multiple entrypoints

问题描述

说我有以下Dockerfile：

Say I have the following Dockerfile:

FROM ubuntu

RUN apt-get update
RUN apt-get install -y apache2
RUN apt-get install -y mongod #pretend this exists

EXPOSE 80

ENTRYPOINT ["/usr/sbin/apache2"]

ENTRYPOINT 命令可以使 apache2 在容器启动时启动。当容器以命令 service mongod start 开头时，我还希望能够启动 mongod 。但是，根据文档，只能有一个 ENTRYPOINT 在Dockerfile中。那么正确的方法是什么？

The ENTRYPOINT command makes it so that apache2 starts when the container starts. I want to also be able to start mongod when the the container starts with the command service mongod start. According to the documentation however, there must be only one ENTRYPOINT in a Dockerfile. What would be the correct way to do this then?

推荐答案

正如Jared Markell所说，如果您想在一个程序中启动多个进程， docker容器，您必须使用 supervisor 。您将必须配置主管来告诉他启动您的不同流程。

As Jared Markell said, if you wan to launch several processes in a docker container, you have to use supervisor. You will have to configure supervisor to tell him to launch your different processes.

我在博客文章，但您确实有一个这里的不错文章详细介绍了如何以及为何在Docker中使用超级用户。

I wrote about this in this blog post, but you have a really nice article here detailing how and why using supervisor in Docker.

基本上，您将希望执行以下操作：

Basically, you will want to do something like:

FROM ubuntu

RUN apt-get update
RUN apt-get install -y apache2
RUN apt-get install -y mongod #pretend this exists
RUN apt-get install -y supervisor # Installing supervisord

ADD supervisord.conf /etc/supervisor/conf.d/supervisord.conf 

EXPOSE 80

ENTRYPOINT ["/usr/bin/supervisord"]

并添加一个配置文件managerd.conf

And add a configuration a file supervisord.conf

[supervisord]
nodaemon=true

[program:mongodb]
command=/etc/mongod/mongo #To adapt, I don't know how to launch your mongodb process

[program:apache2]
command=/usr/sbin/apache2 -DFOREGROUND

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编辑：由于此答案收到了很多支持，我想以此作为警告，警告说不要将Supervisor 视为运行多个作业的最佳实践。相反，您可能有兴趣为您的不同进程创建多个容器并通过 docker compose 对其进行管理。
简而言之， Docker Compose 允许您在一个文件中定义应用程序所需的所有容器，并在一个命令中启动它们。

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EDIT: As this answer has received quite lot of upvotes, I want to precise as a warning that using Supervisor is not considered as a best practice to run several jobs. Instead, you may be interested in creating several containers for your different processes and managing them through docker compose. In a nutshell, Docker Compose allows you to define in one file all the containers needed for your app and launch them in one single command.

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