10.19.06

Changes to Spawner in Edge Rails

by Chris Abad

I recently switched one of my apps over to edge rails and was thrown for a bit of a loop when I went to go deploy it on our production server. A quick Google search didn’t turn up much help, so I figured I’d post my findings here.

First of all, it seems like spawner/reaper are now using pid files found in tmp/pids to reference the fcgi/mongrel (yes mongrel too, more on that in a bit…) processes.

While I prefer this, things get a little tricky when using Capistrano. The challenge is that you want your PID files to persist accross releases. The trick is to setup the PID ’s as a shared resource across all releases. Add these tasks to your Capistrano deploy recipe:

desc "Share PIDs accross releases" 
task :after_setup do
run "mkdir -p -m 755 #{shared_path}/tmp/pids" 
end
desc "Link to shared PIDs" 
task :after_update_code do
run <<-CMD
rm -rf #{release_path}/tmp/pids
ln -nfs #{deploy_to}/#{shared_dir}/tmp/pids #{release_path}/tmp/pids
CMD
end

The next issue that I ran into was when Capistrano went to restart my app, it tried to start a Mongrel process rather than my normal FCGI process. According to the changelog, spawner now prefers Mongrel by default.

I have yet to switch over to Mongrel like all the cool kids, so I had to figure out a way to get spawner back to FCGI . Here are the examples straight from the documentation:

spawner               # starts instances on 8000, 8001, and 8002 using Mongrel if available 
spawner fcgi          # starts instances on 8000, 8001, and 8002 using FCGI 
spawner mongrel -i 5  # starts instances on 8000, 8001, 8002, 8003, and 8004 using Mongrel 
spawner -p 9100 -i 10 # starts 10 instances counting from 9100 to 9109 using Mongrel if available 
spawner -p 9100 -r 5  # starts 3 instances counting from 9100 to 9102 and attempts start them every 5 seconds

That pretty much wraps it up. Once I figured out what was going on, and made a few slight adjustments, everything was back up and running as it should be.

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