docker-nginx-marathon

Based on Nginx official image, with an added cron job to query specified Marathon instances and create upstreams.

The script is based on 'haproxy-marathon-bridge' from marathon's project (https://github.com/mesosphere/marathon/blob/master/bin/haproxy-marathon-bridge)

Supervisor is used in order to run cron in foreground, as it doesn't work when running in background inside the docker.

Usage

docker run ... argussecurity/nginx-marathon inject-and-run <apps_regex> <marathon host:port>+

where <apps_regex> is a regular expression to filter Marathon's tasks on (use "" for all).

Example

docker run -d -p 80:80 argussecurity/nginx-marathon inject-and-run "^(play-server|node-server)$" localhost:8080

Will do the following:

1. Create a cron job to run 'nginx-marathon-bridge' script every 1 minute. The script generates a file named 'sites.conf' in /etc/nginx/conf.c/ The file will contain all tasks queried from Marathon that match the given regex ("^(play-server|node-server)$") as upstreams, for example:

   upstream play-server {
       server some_route:some_port;
       # ...
   }
   upstream node-server {
       server some_route:some_port;
       # ...
   }
   

2. Run nginx as in the official nginx docker (nginx -g "daemon off;")

Notes

• For some reason, the cron job doesn't work when running with HOST networking (--net=host)