Keeping it working.
There is one maintenance task you have to do on nameds, other than
keeping them running. That's keeping the root.cache file
updated. The easiest way is using dig, first run dig with no
arguments, you will get the root.cache according to your own
server. Then ask one of the listed root servers with dig
@rootserver . ns. You will note that the output looks terribly like
a root.cache file except for a couple of extra numbers. Those numbers
are harmless. Save it to a file (dig @e.root-servers.net . ns
>root.cache.new) and replace the old root.cache with it.
Remember to restart named after replacing the cache file.
Al Longyear sent me this script that can be run automatically to
update root.cache, install a crontab entry to run it once a month
and forget it. The script assumes you have mail working and that the
mail-alias `hostmaster' is defined. You must hack it to suit your
setup.
#!/bin/sh # # Update the nameserver cache information file once per month. # This is run automatically by a cron entry. # ( echo "To: hostmaster <hostmaster>" echo "From: system <root>" echo "Subject: Automatic update of the named.boot file" echo export PATH=/sbin:/usr/sbin:/bin:/usr/bin: cd /var/named dig @rs.internic.net . ns >root.cache.new echo "The named.boot file has been updated to contain the following information:" echo cat root.cache.new chown root.root root.cache.new chmod 444 root.cache.new rm -f root.cache.old mv root.cache root.cache.old mv root.cache.new root.cache ndc restart echo echo "The nameserver has been restarted to ensure that the update is complete." echo "The previous root.cache file is now called /var/named/root.cache.old." ) 2>&1 | /usr/lib/sendmail -t exit 0
Some of you might have picked up that the root.cache file is also available by ftp from Internic. Please don't use ftp to update root.cache, the above method is much more friendly to the net.