Docker - Node.js + MongoDB - “错误：无法连接到 [localhost:27017]”

Question

我正在尝试为我的 Node 应用创建一个容器。这个应用程序使用 MongoDB 来确保一些数据持久性。 所以我创建了这个Dockerfile：

FROM    ubuntu:latest

# --- Installing MongoDB
# Add 10gen official apt source to the sources list
RUN apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv 7F0CEB10
RUN echo 'deb http://downloads-distro.mongodb.org/repo/ubuntu-upstart dist 10gen' | tee /etc/apt/sources.list.d/10gen.list
# Hack for initctl not being available in Ubuntu
RUN dpkg-divert --local --rename --add /sbin/initctl
RUN ln -s /bin/true /sbin/initctl
# Install MongoDB
RUN apt-get update
RUN apt-get install mongodb-10gen
# Create the MongoDB data directory
RUN mkdir -p /data/db
CMD ["usr/bin/mongod", "--smallfiles"]

# --- Installing Node.js

RUN apt-get update
RUN apt-get install -y python-software-properties python python-setuptools ruby rubygems
RUN add-apt-repository ppa:chris-lea/node.js

# Fixing broken dependencies ("nodejs : Depends: rlwrap but it is not installable"):
RUN echo "deb http://archive.ubuntu.com/ubuntu precise universe" >> /etc/apt/sources.list

RUN echo "deb http://us.archive.ubuntu.com/ubuntu/ precise universe" >> /etc/apt/sources.list
RUN apt-get update
RUN apt-get install -y nodejs 

# Removed unnecessary packages
RUN apt-get purge -y python-software-properties python python-setuptools ruby rubygems
RUN apt-get autoremove -y

# Clear package repository cache
RUN apt-get clean all

# --- Bundle app source
ADD . /src
# Install app dependencies
RUN cd /src; npm install

EXPOSE  8080
CMD ["node", "/src/start.js"]

然后我通过以下方式构建并启动整个项目：

$ sudo docker build -t aldream/myApp
$ sudo docker run aldream/myApp

但是机器显示如下错误：

[error] Error: failed to connect to [localhost:27017]

知道我做错了什么吗？谢谢！

Answer 1

如下重新定义你的 Dockerfile；

COPY supervisord.conf /etc/supervisor/conf.d/supervisord.conf

# ENTRYPOINT should not be used as it wont allow commands from run to be executed

# Define mountable directories.
VOLUME ["/data/db"]

# Expose ports.
#   - 27017: process
#   - 28017: http
#   - 9191: web app
EXPOSE 27017 28017 9191

ENTRYPOINT ["/usr/bin/supervisord"]

supervisord.conf 将包含以下内容；

[supervisord]
nodaemon=true

[program:mongod]
command=/usr/bin/mongod --smallfiles
stdout_logfile=/var/log/supervisor/%(program_name)s.log
stderr_logfile=/var/log/supervisor/%(program_name)s.log
autorestart=true

[program:nodejs]
command=nodejs /opt/app/server/server.js 

Answer 2

你真的是docker run aldream/myApp吗？在这种情况下，使用您提供的 Dockerfile，它应该运行 MongODB，而不是您的应用程序。是否还有另一个CMD 命令，或另一个Dockerfile，或者您正在运行docker run aldream/myApp <somethingelse>？在后一种情况下，它将覆盖CMD 指令并且不会启动MongoDB。

如果您想在单个容器中运行多个进程，您需要一个进程管理器（例如 Supervisor、god、monit）或从脚本在后台启动进程；例如：

#!/bin/sh
mongod &
node myapp.js &
wait