Start two servers in one docker container

Question

I have created a `Dockerfile` with all of my configurations. At the end I want to run one python server from `python server.py` And also a node server from `npm start` Because I can have one `CMD` or `ENTRYPOINT` how can I start both these two servers when `docker run` executed? What is the docker recommended way to handle these kind of situations?

Accepted Answer

You can use `supervisord` when you want to run multiple processes in one container - like in your case `npm` and `python server`.

Check documentation for supervisord for more information.

I just pick some important parts.

- 1, You will need to install supervisord for docker image

Something like:

```
CentOS: `yum install supervisor`

Ubuntu: `apt-get install -y supervisor`
```

- 2, copy configuration for supervisord (`supervisord.conf`) to docker image .

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

In your case `supervisord.conf` should looks like example below (not tested) :

```
[supervisord]
nodaemon=true

[program:npm]
command=npm start

[program:python]
command=python server.py
```

and run `supervisord` as `CMD` command in Dockerfile:

```
...
# install supervisord
# copy supervisord configuration
...
# run supervisord
CMD ["/usr/bin/supervisord"]
```

Start two servers in one docker container

Solution

Problem