How to restart server programmatically?

[Russell_N]

I need to be able to restart my server based on a specific database
change.
I’ve been trying a call to system(“script/process/reaper -a graceful -d
dispatch.fcgi”) but that raises a transaction error which rolls back the
save. I wasn’t aware that after_save would rollback. That’s potentially
useful but pretty much not right now. Here’s my code:

def after_update
system("#{RAILS_ROOT}/script/process/reaper -a graceful -d
dispatch.fcgi")
if routing_modified?
end

I’ve also looked at calling the Killer in
“vendor/rails/railties/lib/commands/process/reaper” but can’t figure out
how
to pass it the correct parameters when just requiring
“commands/process/reaper” calls an instance of Killer.

I’d really appreciate your help, kittens. Before I forget, I’m running
Apache2 [no Mongrel, sadly] and Edge Rails if that makes a difference.

RSL

[Russell_N]

Just in case anyone Googles this looking for a solution, the answer I
came
up with is branching off a new Thread in an after_filter in the
controller
and some polite modification of dispatch.fcgi.

[in my controller]
def ensure_fresh_server
begin
Thread.new do
logger.info “restarting server!”
system “#{RAILS_ROOT}/script/process/reaper -a graceful”
end if @site.is_active? or @site.is_active_modified?
end rescue nil
end

[dispatch.fcgi]
#!/usr/bin/env ruby

require File.dirname(FILE) + “/…/config/environment”
require ‘fcgi_handler’

class RailsFCGIHandler
private
def busy_exit_handler(signal)
dispatcher_log :info, “busy: asked to terminate during request
signal
#{signal}, deferring!”
@when_ready = :exit
end

Dreamhost sends the term signal and if were handling a request

defer it
def term_process_request(cgi)
install_signal_handler(‘TERM’,method(:busy_exit_handler).to_proc)
Dispatcher.dispatch(cgi)
rescue Exception => e # errors from CGI dispatch
raise if SignalException === e
dispatcher_error(e)
ensure
install_signal_handler(‘TERM’, method(:exit_now_handler).to_proc)
end
alias_method :process_request, :term_process_request
end

RailsFCGIHandler.process!

End of file…

RSL