nginx-0.5.24, server executable upgrade "on the fly"

Web Sysadmin

There is a new version of the nginx web server - nginx-0.5.24. Too many upgrades recently :( From the changelog:

Bugfix: a part of response body may be passed uncompressed if gzip was used; bug appeared in 0.5.23.

I have a small ugly shell script for upgrading:

#!/bin/sh
VER=0.5.24
if [ ! -d ~/Work/nginx-${VER} ]; then
  cd ~/Work
  wget http://sysoev.ru/nginx/nginx-${VER}.tar.gz && \
  tar xvzf nginx-${VER}.tar.gz
fi
if [ -d ~/Work/nginx-${VER} ]; then
  cd ~/Work/nginx-${VER} && ./configure --prefix=/opt/nginx \
     --with-openssl=/usr/lib/ --with-sha1=/usr/lib \
     --with-http_realip_module --with-http_ssl_module && make
fi

The interesting part is after the installation - upgrade the server executable "on the fly", without restarting:

% cd ~/Work/nginx-0.5.24
% sudo make install
% sudo kill -USR2 `cat /opt/nginx/logs/nginx.pid`
% tail -f /opt/nginx/logs/error.log
2007/06/07 14:27:23 [notice] 4382#0: signal 12 (SIGUSR2) received, changing binary
2007/06/07 14:27:23 [notice] 4382#0: changing binary
2007/06/07 14:27:23 [notice] 4382#0: start new binary process 6500
2007/06/07 14:27:23 [notice] 6500#0: using inherited sockets from "6;7;"
2007/06/07 14:27:23 [notice] 6500#0: using the "epoll" event method
2007/06/07 14:27:23 [notice] 6500#0: nginx/0.5.24

Well done software = happy sysadmin = happy users :)