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Making sure a daemon runs on server reboot

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Another piece of code that I always seem to have to look up when I need it... The command for getting mysqld (or another daemon) to start up when the server reboots is chkconfig, used as follows:

chkconfig mysqld on

If you just enter chckconfig, it will output a list of the daemons and their current status:

Running scripts with rails script/runner

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Lately I've been needing to write short Rails scripts to make changes and updates to items in the database and associated images. I repeatedly tried to create a freestanding script and then run it with "ruby script/runner [script-name]," to no avail.

In the end, my solution was just to put the script into the model file of one of my objects, then run it with "ruby script/runner [Object].[method]" -- this worked like a charm!

Restarting a rails app on shared hosting

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I don't work in Rails very much these days, so when I do go back to it I get frustrated that I've forgotten even the most basic principles and techniques.

If you've made tweaks to a Rails app and need to reload the cached version of the site, use the following commands to first find the process id (pid) of the dispatch.fcgi job, then kill that process:

  1. ps aux | grep ruby
  2. kill -USR2 [pid]

 

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