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Resolve error below:
Step 5 : RUN apt-get install -y openssh-server apache2 supervisor
---> Running in 816b405cf0d1
Reading package lists...
Building dependency tree...
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:
The following packages have unmet dependencies:
apache2 : Depends: apache2-mpm-worker (= 2.2.22-1ubuntu1) but it is not going to be installed or
apache2-mpm-prefork (= 2.2.22-1ubuntu1) but it is not going to be installed or
apache2-mpm-event (= 2.2.22-1ubuntu1) but it is not going to be installed or
apache2-mpm-itk (= 2.2.22-1ubuntu1) but it is not going to be installed
Depends: apache2.2-common (= 2.2.22-1ubuntu1) but it is not going to be installed
E: Unable to correct problems, you have held broken packages.
The command '/bin/sh -c apt-get install -y openssh-server apache2 supervisor' returned a non-zero code: 100
67 lines
2.8 KiB
Markdown
67 lines
2.8 KiB
Markdown
## 使用 Supervisor 来管理进程
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Docker 容器在启动的时候开启单个进程，比如，一个 ssh 或者 apache 的 daemon 服务。但我们经常需要在一个机器上开启多个服务，这可以有很多方法，最简单的就是把多个启动命令放到一个启动脚本里面，启动的时候直接启动这个脚本，另外就是安装进程管理工具。
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本小节将使用进程管理工具 supervisor 来管理容器中的多个进程。使用 Supervisor 可以更好的控制、管理、重启我们希望运行的进程。在这里我们演示一下如何同时使用 ssh 和 apache 服务。
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### 配置
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首先创建一个 Dockerfile，内容和各部分的解释如下。
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```
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FROM ubuntu:13.04
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MAINTAINER examples@docker.com
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RUN echo "deb http://archive.ubuntu.com/ubuntu precise main universe" > /etc/apt/sources.list
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RUN apt-get update
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RUN apt-get upgrade -y
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```
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### 安装 ssh、apache 和 supervisor
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```
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RUN apt-get install -y --force-yes perl-base=5.14.2-6ubuntu2
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RUN apt-get install -y apache2.2-common
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RUN apt-get install -y openssh-server apache2 supervisor
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RUN mkdir -p /var/run/sshd
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RUN mkdir -p /var/log/supervisor
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```
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这里安装 3 个软件，还创建了 2 个 ssh 和 supervisor 服务正常运行所需要的目录。
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```
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COPY supervisord.conf /etc/supervisor/conf.d/supervisord.conf
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```
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添加 supervisord 的配置文件，并复制配置文件到对应目录下面。
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```
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EXPOSE 22 80
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CMD ["/usr/bin/supervisord"]
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```
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这里我们映射了 22 和 80 端口，使用 supervisord 的可执行路径启动服务。
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### supervisor配置文件内容
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```
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[supervisord]
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nodaemon=true
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[program:sshd]
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command=/usr/sbin/sshd -D
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[program:apache2]
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command=/bin/bash -c "source /etc/apache2/envvars && exec /usr/sbin/apache2 -DFOREGROUND"
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```
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配置文件包含目录和进程，第一段 supervsord 配置软件本身，使用 nodaemon 参数来运行。第二段包含要控制的 2 个服务。每一段包含一个服务的目录和启动这个服务的命令。
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### 使用方法
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创建镜像。
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```
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$ sudo docker build -t test/supervisord .
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```
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启动 supervisor 容器。
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```
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$ sudo docker run -p 22 -p 80 -t -i test/supervisord
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2013-11-25 18:53:22,312 CRIT Supervisor running as root (no user in config file)
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2013-11-25 18:53:22,312 WARN Included extra file "/etc/supervisor/conf.d/supervisord.conf" during parsing
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2013-11-25 18:53:22,342 INFO supervisord started with pid 1
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2013-11-25 18:53:23,346 INFO spawned: 'sshd' with pid 6
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2013-11-25 18:53:23,349 INFO spawned: 'apache2' with pid 7
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```
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使用 `docker run` 来启动我们创建的容器。使用多个 `-p` 来映射多个端口，这样我们就能同时访问 ssh 和 apache 服务了。
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可以使用这个方法创建一个只有 ssh 服务的基础镜像，之后创建镜像可以使用这个镜像为基础来创建
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