I've just spent an hour or two looking into this, so thought I'd share for anyone else similarly stuck.
I'm trying to monitor a bunch of processes on a Linux machine with the agent installed (Centos 7, if it matters). It seems that SW uses the output of something like "ps -ae" to get process names, but in my case, the processes have changed their names to far more descriptive ones (which you can see in "ps -ax").
For example, this is what SW 'sees':
119503 ? 03:24:06 ruby
119971 ? 00:00:08 PassengerAgent
119974 ? 01:09:47 PassengerAgent
119982 ? 00:00:15 PassengerAgent
119993 ? 00:00:00 nginx-1.12.1
119994 ? 00:04:10 nginx-1.12.1
120004 ? 00:00:00 PassengerAgent
120070 ? 00:48:33 ruby
...but this is what I'd like to be able to use:
119503 ? Sl 204:07 sidekiq 4.2.7 myapp [0 of 25 busy]
119971 ? Ssl 0:08 Passenger watchdog
119974 ? Sl 69:47 Passenger core
119982 ? Sl 0:15 Passenger ust-router
119993 ? Ss 0:00 nginx: master process /usr/lib64/passenger/support-binaries/nginx-1.12.1 -c /tmp/passenger-standalone.trp0zs/nginx.conf -p /tmp/passenger-standalone.trp0zs
119994 ? S 4:10 nginx: worker process
120004 ? Ss 0:00 /usr/lib64/passenger/support-binaries/PassengerAgent temp-dir-toucher /tmp/passenger-standalone.trp0zs --cleanup --daemonize --pid-file /tmp/passenger-standalone.trp0zs/temp_
120070 ? Sl 48:33 Passenger RubyApp: /home/myapp/myapp
It turns out you can monitor this quite effectively. In the Process Monitor (Component Monitor):
- "Process Name" must be the 'ps -ae' name of the process (ie. the one derived from the binary that was run to create it)
- "Command Line Filter" can be the changed name (as seen in 'ps -ef'). You can use the whole output
Eg: Process Name: "PassengerAgent", Command Line Filter: "Passenger watchdog"
The limitations here are that (say) you end up monitoring "nginx-1.12.1", because that's the binary name - if you do an upgrade, all your monitoring will erroneously break. You can't do a check on the "Process Name" with a wildcard to skip over minor differences like that. Either way, I hope it saves someone an hour or two :-)
