verify dhcpd.conf for syntax errors

In CentOS you can check to see if your dhcpd.conf file has any syntax errors before you restart DHCP and it fails to come up.

You’ll need to run a command called dhcpd and point it to your configuration file like this:

[root@dhcp-server ~]# dhcpd -t -cf /etc/dhcp/dhcpd.conf

 
If you run into any syntax errors, it will point it out for you like so:

[root@dhcp-server ~]# dhcpd -t -cf /etc/dhcp/dhcpd.conf
Internet Systems Consortium DHCP Server 4.1.1-P1
Copyright 2004-2010 Internet Systems Consortium.
All rights reserved.
For info, please visit https://www.isc.org/software/dhcp/
/etc/dhcp/dhcpd.conf line 474: semicolon expected.
server-a {
^
/etc/dhcp/dhcpd.conf line 476: fixed-address parameter not allowed here.
fixed-address 192.168.1.50;
^
/etc/dhcp/dhcpd.conf line 476: expecting a parameter or declaration

 

If your configuration is good, it should come up clean like so:

Internet Systems Consortium DHCP Server 4.1.1-P1
Copyright 2004-2010 Internet Systems Consortium.
All rights reserved.
For info, please visit https://www.isc.org/software/dhcp/

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