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#!/bin/sh
# Start/stop/restart the BIND name server daemon (named).
# Start bind. In the past it was more secure to run BIND
# as a non-root user (for example, with '-u daemon'), but
# the modern version of BIND knows how to use the kernel's
# capability mechanism to drop all root privileges except
# the ability to bind() to a privileged port and set process
# resource limits, so -u should not be needed. If you wish
# to use it anyway, chown the /var/run/named directory to
# the non-root user.
#
# You might also consider running BIND in a "chroot jail",
# a discussion of which may be found in
# /usr/doc/Linux-HOWTOs/Chroot-BIND-HOWTO.
# One last note: rndc has a lot of other nice features that
# it is not within the scope of this start/stop/restart script
# to support. For more details, see "man rndc" or just type
# "rndc" to see the options.
# Sanity check. If either /usr/sbin/named or /etc/named.conf
# aren't ready, it doesn't make much sense to try to run this
# script:
if [ ! -x /usr/sbin/named ]; then
echo "/etc/rc.d/rc.bind: no /usr/sbin/named found (or not executable); cannot start."
exit 1
elif [ ! -f /etc/named.conf ]; then
echo "/etc/rc.d/rc.bind: no /etc/named.conf found; cannot start /usr/sbin/named."
exit 1
fi
# Start BIND. As many times as you like. ;-)
# Seriously, don't run "rc.bind start" if BIND is already
# running or you'll get more than one copy running.
bind_start() {
if [ -x /usr/sbin/named ]; then
echo "Starting BIND: /usr/sbin/named"
/usr/sbin/named
sleep 1
fi
if ! ps axc | grep -q named ; then
echo "WARNING: named did not start."
echo "Attempting to start named again: /usr/sbin/named"
/usr/sbin/named
sleep 1
if ps axc | grep -q named ; then
echo "SUCCESS: named started."
else
echo "FAILED: Sorry, a second attempt to start named has also failed."
echo "There may be a configuration error that needs fixing. Good luck!"
fi
fi
}
# Stop all running copies of BIND (/usr/sbin/named):
bind_stop() {
echo "Stopping BIND: /usr/sbin/rndc stop"
/usr/sbin/rndc stop
# A problem with using "/usr/sbin/rndc stop" is that if you
# managed to get multiple copies of named running it will
# only stop one of them and then can't stop the others even
# if you run it again. So, after doing things the nice way
# we'll do them the old-fashioned way. If you don't like
# it you can comment it out, but unless you have a lot of
# other programs you run called "named" this is unlikely
# to have any ill effects:
sleep 1
if ps axc | grep -q named ; then
echo "Using "killall named" on additional BIND processes..."
/bin/killall named 2> /dev/null
fi
}
# Reload BIND:
bind_reload() {
/usr/sbin/rndc reload
}
# Restart BIND:
bind_restart() {
bind_stop
bind_start
}
# Get BIND status:
bind_status() {
/usr/sbin/rndc status
}
case "$1" in
'start')
bind_start
;;
'stop')
bind_stop
;;
'reload')
bind_reload
;;
'restart')
bind_restart
;;
'status')
bind_status
;;
*)
echo "usage $0 start|stop|reload|restart|status"
esac
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