By default the ISC DHCP Server logs to the common-all-garden /var/log/messages which is fine, but I've always preferred a little log apartheid on my systems. This snippet shows how to make dhcpd log to its own, exclusive log file.
Firstly create the log file itself..
touch /var/log/dhcpd.log
The daemon which maintains the system logs is called syslog. Before modifying its config file, make a backup 'cos that's a good thing to do..
cp /etc/rsyslog.d/50-default.conf /etc/rsyslog.d/50-default.conf.bak
..then edit the file using your favourite text editor..
vi /etc/rsyslog.d/50-default.conf
Add the following directive to the end of the config file..
# dhcp log
!dhcpd
*.* /var/log/dhcpd.log
Finally restart the syslog service..
sudo restart rsyslog
Now when a new IP is given out, or the dhcpd daemon is restarted, the service will write to its own log file. Neat..
Related Links
Logging the DHCP Service (FreeBSD)
- A.
