Gordo is a Go based Redis process manager. It is intended to provide a way to run Redis in docker when being used as part of a Sentinel managed Redis pod or possibly a Redis Cluster cluster. As such it is a bit opinionated.
This code is currently beta at best. Mostly proof of concept and working to establish the basic pattern.
When running Redis in Docker as a standalone it works fine. However
because of how Sentinel works it can be broken if you do not pass the
--net=host option to your Docker container because Redis will see it's
Docker IP which is reachable only by the Docker host other containers on it.
The proper solution is for Redis to be able to have it's "announce IP/Port" modified at runtime. The details on this can be found at [http://bit.ly/1OUvXDI](My DevDay2015 Proposal). Until this is implemented, however, we need a decent workaround. This is where Gordo comes in.
The workaround is to be able to spin up the container with Redis not yet running and have a way to start it with the information needed. Gordo is essentially a daemon which will listen for this information on a port which you can then make a call to set this information and launch Redis.
The idea here is that because the IP/Port information for the container is not normally available until after it starts we can look that up and then start the Redis process. Ultimately, if a fix like the one I've proposed is implemented Gordo will be able to handle that with no change to the code configuring it.
Will go here once I've decided on it. First I want to get the process management portion working.