Package: nginx
Version: 0.4.12-5
Severity: wishlist
Niginx has the ability to update it's binary to a new version "on the
fly", without breaking existing connections, rather starting new binary
and accepting new connection on new workers, while old one gracefully
exiting.
In practice it looks like:
after installing new binary you need to send -USR2 to main nginx
process.
nginx renames it's PID to .oldbin (for ex. /var/run/nginx.pid.oldbin)
and then starting new master process with pid in usual place.
so at this moment only new workers are accepting connections and
it's time to send -QUIT (or -WINCH if we need ability to rollback) to old
master process.
After all old worker gracefully finish, old master process exits too.
example of prerm:
set -e
case "$1" in
remove|remove-in-favour|deconfigure|deconfigure-in-favour)
invoke-rc.d nginx stop
;;
upgrade|failed-upgrade)
;;
esac
exit 0
example of postinst:
set -e
case "$1" in
configure)
;;
abort-upgrade|abort-remove|abort-deconfigure)
;;
*)
echo "postinst called with unknown argument \`$1'" >&2
exit 1
;;
esac
if [ -x "/etc/init.d/nginx" ]; then
update-rc.d nginx defaults >/dev/null
if [ -f /var/run/nginx.pid ]; then
kill -USR2 `cat /var/run/nginx.pid`
while [ ! -f /var/run/nginx.pid.oldbin ]
do
cnt=`expr $cnt + 1`
if [ $cnt -gt 10 ]
then
echo "Nginx 'soft' update failed, doing
restart";
kill -9 `cat /var/run/nginx.pid`
invoke-rc.d nginx start
exit 0
fi
sleep 1
done
kill -QUIT `cat /var/run/nginx.pid.oldbin`
else
invoke-rc.d nginx start
fi
fi
-- System Information:
Debian Release: testing/unstable
APT prefers testing
APT policy: (1000, 'testing')
Architecture: i386 (i686)
Kernel: Linux 2.6.17-2-686
Locale: LANG=ru_RU.KOI8-R, LC_CTYPE=ru_RU.koi8r (charmap=KOI8-R) (ignored:
LC_ALL set to ru_RU.koi8r)
Versions of packages nginx depends on:
ii libc6 2.3.6.ds1-4 GNU C Library: Shared libraries
ii libpcre3 6.7-1 Perl 5 Compatible Regular Expressi
ii zlib1g 1:1.2.3-13 compression library - runtime
-- no debconf information
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