CARP and DHCP server

[ttanemori]

"CARP (Failover)" under "Status" shows that the primary box is "Master," and the backup box shows "backup."

However, dhcpd on the primary box is disabled, and I cannot enable it. DHCP IP range on both boxes are same.

Normally, if I configure CARP, is the primary box turn off dhcpd automatically?

[viragomann]

Do you have configured the "Failover peer IP" for the DHCP server and the CARP advskew correctly on both machines?
The DHCP service use "20" as threshold to determine whether a machine is backup or master.

[ttanemori]

Failover IP should be fine. I read manual, and both machines have correct IP each other. But I am not sure about advskew. I saw it in the manual, but I could not understand what to do.

I thought I should have changed the number on these pages (attached - left is master, right is backup), but values are already there, and the left one is higher than right one.

I attached another screen shot (service.PNG). This is what I do not understand. dhcpd on the master does not start at all.

Could you help me to make my system work?

Thank you.

[dotdash]

Check system logs, DHCP. The errors are usually helpful. Make sure you are using the IP of the Interface you are running DHCP on as the failover peer IP. eg- 192.168.100.3 on the primary (if the primary is 192.168.100.2 and secondary is .3)

[cthomas]

Check the DHCP Log - Do you see an error message indicating that 'dhcpd is already running' ?

If so, remove the following file using the GUI Command Prompt:  rm /var/dhcpd/var/run/dhcpd.pid

-ct

[ttanemori]

Thank you very much for your help.

Log told me some ideas. In my case, interface assignment on both devices was slightly different. After I reassigned them, it began to work.

Thanks again!