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Re:Ask HN: large system monitoring by mmmurf on Saturday January 24, 2009 @02:12PM (#448312)
Monit has been very useful to me as well.

I also use capistrano's command: "cap shell" to easily type the same command on all the servers.

Re:Ask HN: large system monitoring by Deadsunrise on Sunday January 25, 2009 @08:32AM (#449099)
I use monit and munin with capistrano tasks to install, update and configure them. Right now I'm monitoring a couple hundred of containers and hosts at work, mostly mail servers.