Objective
Rotate Rails log and make sure that after log rotation happened, the production.log will be written normally.
Solution
- Create init script for restarting rails app with unicorn as http server
- Create logrotate for rotating rails log in timeframe and restart rails app after log rotation finished
Codes
# touch /etc/init.d/rails
# chmod +x /etc/init.d/rails
# chown username:username /etc/init.d/rails
File: /etc/init.d/rails
#!/bin/sh
set -e
TIMEOUT=${TIMEOUT-60}
RAILS_ENV=production
APP_ROOT=/opt/username/current
PID=$APP_ROOT/tmp/pids/unicorn.pid
PATH=$PATH:/home/username/.rbenv/shims
CMD="$APP_ROOT/bin/unicorn -D -c $APP_ROOT/config/unicorn.rb -E $RAILS_ENV"
action="$1"
set -u
old_pid="$PID.oldbin"
cd $APP_ROOT || exit 1
sig () {
test -s "$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
$CMD
;;
stop)
sig QUIT && exit 0
echo >&2 "Not running"
;;
force-stop)
sig TERM && exit 0
echo >&2 "Not running"
;;
restart|reload)
sig HUP && echo reloaded OK && exit 0
echo >&2 "Couldn't reload, starting '$CMD' instead"
$CMD
;;
upgrade)
if sig USR2 && sleep 2 && sig 0 && oldsig QUIT
then
n=$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"
$CMD
;;
reopen-logs)
sig USR1
;;
*)
echo >&2 "Usage: $0 <start|stop|restart|upgrade|force-stop|reopen-logs>"
exit 1
;;
esac
File: /etc/logrotate.d/rails-logs
/opt/username/shared/log/*log {
create 0644 username username
su root username
daily
rotate 1
compress
missingok
notifempty
sharedscripts
postrotate
service rails restart > /dev/null 2>/dev/null || true
endscript
}