Setting up Nginx Proxy in Docker using Ansible

Question

I am attempting to setup an nginx container that serves as a proxy to another container I have setup. I would like to automate this setup as I need to deploy a similar setup across several servers. For this I am using Ansible.

Here is my nginx.conf:

events {
  worker_connections 1024;
}

http {
  server {
    listen 8080;
    location / {
      proxy_pass http://192.168.1.14:9000;
    }
  }
}

Here is the relevant part of my Ansible YAML file:

- name: Install Nginx
      docker:
        name: nginx
        image: nginx
        detach: True
        ports:
            - 8080:8080
        volumes:
            - /etc/docker/nginx/nginx.conf:/etc/nginx/nginx.conf:ro

When I first run my playbook, nginx is running but is not bound to 8080 as seen here:

6a4f610e86d nginx "nginx -g 'daemon off" 35 minutes ago   Up Less than a second  80/tcp, 443/tcp nginx

However, if I run the nginx container directly with:

docker run -d -v /etc/docker/nginx/nginx.conf:/etc/nginx/nginx.conf:ro -p 8080:8080 nginx

nginx and my proxy runs as expected and is listening on 8080:

c3a46421045c nginx "nginx -g 'daemon off" 2 seconds ago Up 1 seconds        80/tcp, 443/tcp, 0.0.0.0:8080->8080/tcp determined_swanson

Any idea why it works one way but not the other?

Update

Per the guidance given in the selected answer, I updated my YAML file thusly:

- name: Install Nginx
  docker:
    name: nginx
    image: nginx
    detach: True
    ports:
        - 8080:8080
    expose:
        - 8080
    volumes:
        - /etc/docker/nginx/nginx.conf:/etc/nginx/nginx.conf:ro

VonC · Accepted Answer · 2015-12-12 07:36:01Z

1

First, you need to make sure your nginx image EXPOSE the port 8080, and you can specify directly in your ansible yaml file:

expose
(added in 1.5)

List of additional container ports to expose for port mappings or links. If the port is already exposed using EXPOSE in a Dockerfile, you don't need to expose it again.

Then, the only other difference I see when considering the Ansible docker module is that the port are inside double-quotes:

ports:
    - "8080:9000"

Also, if you want to prexypass to another container in the same docker daemon, you might want to use a link instead of a fixed IP address.

links:
    - "myredis:aliasedredis"

That way, your nginx.conf includes a fixed rule:

proxy_pass http://aliasedredis:9000;

edited Dec 12, 2015 at 7:36

answered Dec 12, 2015 at 5:43

VonC

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3 Comments

Julio Over a year ago

Thanks - I went ahead and tried the quotes just to make sure, but it still doesn't bind to port 8080. Any other ideas?

VonC Over a year ago

@Louis you need to be sure your nginx image does EXPOSE the port 8080

Julio Over a year ago

Yup expose was exactly what I needed. If you want to update your answer, I'll accept it.

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