nginx-proxy/README.md

nginx-proxy sets up a container running nginx and [docker-gen][1].  docker-gen generate reverse proxy configs for nginx and reloads nginx when containers are started and stopped.

See [Automated Nginx Reverse Proxy for Docker][2] for why you might want to use this.

### Usage

To run it:

    $ docker run -d -p 80:80 -v /var/run/docker.sock:/tmp/docker.sock jwilder/nginx-proxy

Then start any containers you want proxied with an env var `VIRTUAL_HOST=subdomain.youdomain.com`

    $ docker run -e VIRTUAL_HOST=foo.bar.com  ...

Provided your DNS is setup to forward foo.bar.com to the a host running nginx-proxy, the request will be routed to a container with the VIRTUAL_HOST env var set.

### Multiple Ports

If your container exposes multiple ports, nginx-proxy will default to the service running on port 80.  If you need to specify a different port, you can set a VIRTUAL_PORT env var to select a different one.  If your container only exposes one port and it has a VIRTUAL_HOST env var set, that port will be selected.

  [1]: https://github.com/jwilder/docker-gen
  [2]: http://jasonwilder.com/blog/2014/03/25/automated-nginx-reverse-proxy-for-docker/

### Multiple Hosts

If you need to support multipe virtual hosts for a container, you can separate each entry with commas.  For example, `foo.bar.com,baz.bar.com,bar.com` and each host will be setup the same.

### Separate Containers

nginx-proxy can also be run as two separate containers using the [jwilder/docker-gen](https://index.docker.io/u/jwilder/docker-gen/)
image and the official [nginx](https://registry.hub.docker.com/_/nginx/) image.

You may want to do this to prevent having the docker socket bound to a publicly exposed container service.

To run nginx proxy as a separate container you'll need to have [nginx.tmpl](https://github.com/jwilder/nginx-proxy/blob/master/nginx.tmpl) on your host system.

First start nginx with a volume:


    $ docker run -d -p 80:80 --name nginx -v /tmp/nginx:/etc/nginx/conf.d -t nginx

Then start the docker-gen container with the shared volume and template:

```
$ docker run --volumes-from nginx \
    -v /var/run/docker.sock:/tmp/docker.sock \
    -v $(pwd):/etc/docker-gen/templates \
    -t docker-gen -notify-sighup nginx -watch -only-published /etc/docker-gen/templates/nginx.tmpl /etc/nginx/conf.d/default.conf
```

Finally, start your containers with `VIRTUAL_HOST` environment variables.

    $ docker run -e VIRTUAL_HOST=foo.bar.com  ...

### SSL Support

SSL is supported single host, wildcards and SNI certificates using naming conventions for
certificates or optionally specify a cert name (for SNI) as an environment variable.

To enable SSL:

    $ docker run -d -p 80:80 -p 443:443 -v /path/to/certs:/etc/nginx/certs -v /var/run/docker.sock:/tmp/docker.sock jwilder/nginx-proxy

The contents of `/path/to/certs` should contain the certificates and private keys for any virtual
hosts in use.  The certificate and keys should be named after the virtual host with a `.crt` and
`.key` extension.  For example, a container with `VIRTUAL_HOST=foo.bar.com` should have a
`foo.bar.com.crt` and `foo.bar.com.key` file in the certs directory.

#### Wildcard Certificates

Wildcard certificates and keys should be name after the domain name with a `.crt` and `.key` extension.
For example `VIRTUAL_HOST=foo.bar.com` would use cert name `bar.com.crt` and `bar.com.key`.

#### SNI

If your certificate(s) supports multiple domain names, you can start a container with `CERT_NAME=<name>`
to identify the certificate to be used.  For example, a certificate for `*.foo.com` and `*.bar.com`
could be named `shared.crt` and `shared.key`.  A container running with `VIRTUAL_HOST=foo.bar.com`
and `CERT_NAME=shared` will then use this shared cert.

#### How SSL Support Works

The SSL cipher configuration is based on [mozilla nginx intermediate profile](https://wiki.mozilla.org/Security/Server_Side_TLS#Nginx) which
should provide compatibility with clients back to Firefox 1, Chrome 1, IE 7, Opera 5, Safari 1,
Windows XP IE8, Android 2.3, Java 7.  The configuration also enables HSTS, and SSL
session caches.

The behavior for the proxy when port 80 and 443 are exposed is as follows:

* If a container has a usable cert, port 80 will redirect to 443 for that container so that HTTPS
is always preferred when available.
* If the container does not have a usable cert, a 503 will be returned.

Note that in the latter case, a browser may get an connection error as no certificate is available
to establish a connection.  A self-signed or generic cert named `default.crt` and `default.key`
will allow a client browser to make a SSL connection (likely w/ a warning) and subsequently receive
a 503.