pulsepointinc/marathon-globalappscaler repository overview

⁠docker-marathon-globalappscaler

At this time, marathon does not support global applications ( i.e. applications that should run on every node ). This project seeks to provide some minimal support for those to address some specific needs of ours.

It is implemented as a docker container which we run as a marathon app. Basically, it:

• Determines the number of mesos agents
• For each configured app, check the current value of the instances attribute
• Update the instances attribute if not equal to the number of mesos agents
• Sleep for some configured number of seconds
• Repeat forever

⁠Configuration

The following values are read from the environment:

GLOBAL_APPS should be a comma-separated list of application ids. For example,

GLOBAL_APPS="/my/apps/foo,/my/apps/bar"

⁠Usage

docker run ... \
--env MESOS_URL="http://mesos.example.org:5050/" \
--env MARATHON_URL="http://marathon.example.org:8080/" \
--env GLOBAL_APPS="/my/apps/foo,/my/apps/bar" \
pulsepointinc/marathon-globalappscaler

⁠Known Issues

There is a total lack of error handling, and the simple python script hasn't seen much use. YMMV.