Restart DHCPD via console / ssh / commandline

luckman212

Is there a (relatively) simple way to restart the dhcpd service from the commandline? I went meandering through the source code and fell down the rabbit hole pretty fast. I found /usr/local/www/status_services.php and saw that it referenced a function called services_dhcpd_configure() which is contained in /etc/inc/service-utils.inc – but when I started browsing through that I started to drown.

Is this possible to do? much obliged

Derelict

This should do it:

pfSsh.php playback restartdhcpd

Or option 12 at the console menu then playback restartdhcpd.

luckman212

Exactly what I needed, thank you! :)

cmcqueen

@derelict said in Restart DHCPD via console / ssh / commandline:

pfSsh.php playback restartdhcpd

Is there a way to do it without having the configuration files be overwritten? Namely
/var/dhcpd/etc/dhcpd.conf and
/var/dhcpd/etc/dhcpdv6.conf.

I am hoping to edit dhcpdv6.conf just for experimentation, but when I restart dhcpd using the above command, my changes get overwritten.

Derelict

@cmcqueen Are you making manual changes to the files then restarting it? It is expected that they will be rewritten in that case. It is not supported in pfSense.

You could ps -axwwww | grep dhcpd, get the proper command line, kill it, then re run the command line.

/root: ps -axwww | grep dhcp
...
96112  -  Ss       0:00.30 /usr/local/sbin/dhcpd -user dhcpd -group _dhcp -chroot /var/dhcpd -cf /etc/dhcpd.conf -pf /var/run/dhcpd.pid vtnet0 vtnet2

/root: kill 96612
/root: /usr/local/sbin/dhcpd -user dhcpd -group _dhcp -chroot /var/dhcpd -cf /etc/dhcpd.conf -pf /var/run/dhcpd.pid vtnet0 vtnet2

There is probably a better way to reload the configuration like kill -HUP 96112 or killall -HUP dhcpd but you'd need to dig into the ISC dhcpd docs to get the proper method.

Again, totally unsupported. If you want to manually configure dhcpd you could just use FreeBSD or Linux.

cmcqueen

Thanks, that's very helpful.

I understand this is unsupported in pfSense. I'm experimenting because I'm an embedded firmware engineer working with a product that wants to get vendor config from DHCPv6.

@derelict said in Restart DHCPD via console / ssh / commandline:

There is probably a better way to reload the configuration like kill -HUP 96112 or killall -HUP dhcpd but you'd need to dig into the ISC dhcpd docs to get the proper method.

According to How to reload the dhcpd configuration file

At this time, the dhcpd server doesn't have any reload mechanism. It doesn't handle HUP signal nor have a 'soft' reconfiguration method. The server has to be stopped and restarted...