Mr.Rubber - your elastic friend

Mr.Rubber is a supervisord event listener. When rubber is started it will dertmine how many processes to keep running based on its settings and by detecting the number of cores on the system. It will start or stop processes which match a spec to match the nominated process count.

Options are:

--programs (-p): Spec for which program names to control. Glob syntax such as "instance*" is supported.

--num (-n): The number of processes to run. Defaults to "auto" which will set this to the number of cpu cores detected when rubber first starts

--offset (-o): A number to modify the --num argument by. For instance if --num=auto and --offset=-2 and the detected cores was 4 then the number of processes set to run would be 2.

--multiple (-m): A number to modify the --num argument by. For instance if --num=auto and --multiple=4 the detected cores was 1 then the number of processes set to run would be 4.

For example if you are using buildout with supervisor you could do the following ::

[supervisor]
recipe=collective.recipe.supervisor
plugins =
  mr.rubber
programs =
  11 instance1 ${buildout:directory}/bin/instance1 [console] ${instance1:location} true
  12 instance2 ${buildout:directory}/bin/instance2 [console] ${instance2:location} true
  13 instance3 ${buildout:directory}/bin/instance3 [console] ${instance3:location} true
  14 instance4 ${buildout:directory}/bin/instance4 [console] ${instance4:location} true
eventlisteners =
  rubber SUPERVISOR_STATE_CHANGE_RUNNING ${buildout:bin-directory}/rubber [-p instance* -o 0 -n auto]

History

1.0 (11-10-11)

• Initial working version released