Linode Deban Linux + Nginx + unicorn_rails - ruby-on-rails

Question

I'm a new Linode/Linux user running Debian 6. I'm trying to get my Unicorn server to start at boot, but for some reason it is not, and I'm not able to track down any error message. Nginx is starting fine, and I have a multi-user RVM install. My gut feeling is that is has something to do with RVM. This is my unicorn_init.sh file in /rails/todo, and there's a symlink to it at /etc/init.d/unicorn:
# unicorn_init.sh
#!/bin/sh
set -e
TIMEOUT=${TIMEOUT-60}
APP_ROOT=/rails/todo
PID=$APP_ROOT/tmp/pids/unicorn.pid
CMD="$APP_ROOT/bin/unicorn_rails -D -c $APP_ROOT/config/unicorn.rb -E production"
GEM_HOME="/usr/local/rvm/gems/ruby-1.9.2-p290#global"
action="$1"
set -u
old_id="$PID.oldbin"
cd $APP_ROOT || exit 1
export GEM_HOME=$GEM_HOME
sig () {
test -s "$PID" && kill -$1 `cat $PID`
}
oldsig () {
test -s $old_pid && kill -$1 `cat $old_pid`
}
case $action in
start)
sig 0 && echo >&2 "Already running" && exit 0
su -c "$CMD" - root
;;
stop)
sig QUIT && exit 0
echo >&2 "Not running"
;;
force-stop)
sig TERM && exit 0
echo >&2 "Not running"
;;
restart|reload)
sig HUP && echo reloaded OK && exit 0
echo >&2 "Couldn't reload, starting '$CMD' instead"
su -c "$CMD" - root
;;
upgrade)
if sig USR2 && sleep 2 && sig 0 && oldsig QUIT
then
n=$TIMEOUT
while test -s $old_pid && test $n -ge 0
do
printf '.' && sleep 1 && n=$(( $n - 1 ))
done
echo
if test $n -lt 0 && test -s $old_pid
then
echo >&2 "$old_pid still exists after $TIMEOUT seconds"
exit 1
fi
exit 0
fi
echo >&2 "Couldn't upgrade, starting '$CMD' instead"
su -c "$CMD" - root
;;
reopen-logs)
sig USR1
;;
*)
echo >&2 "Usage: $0 <start|stop|restart|upgrade|force-stop|reopen-logs>"
exit 1
;;
esac
I'm 99% of the way to getting my setup working—any advice would be much appreciated.
Here is the output of $ update-rc.d unicorn defaults:
update-rc.d: using dependency based boot sequencing
insserv: warning: script 'unicorn' missing LSB tags and overrides
insserv: There is a loop between service nginx and unicorn if stopped
insserv: loop involving service unicorn at depth 2
insserv: loop involving service nginx at depth 1
insserv: Stopping unicorn depends on nginx and therefore on system facility `$all' which can not be true!
insserv: exiting now without changing boot order!
update-rc.d: error: insserv rejected the script header

Answer 1

update-rc.d: error: insserv rejected the script header
The start of your file looks like:
# unicorn_init.sh
#!/bin/sh
The shebang line (#!/bin/sh) MUST be the very first line of the file.
I can't comment on the loop-detection messages as I haven't ever seen 'em before. It's possible something you say in /etc/init.d/nginx is expressing dependency on unicorn, but I don't see anything in the unicorn init which expresses a dependency on nginx, so the loop isn't clear.
insserv: warning: script 'unicorn' missing LSB tags and overrides
You should add LSB info to your init script http://wiki.debian.org/LSBInitScripts