ISC DHCP¶

ISC implementation is based on the omapi interface, which means:

• No need for root permissions on your DHCP server
• No need to restart (or "sync") your dhcp server after every modifications.

Configuration¶

• dhcpd configuration file:
  ensure you have the following line in your dhcpd.conf file (somewhere in the top first lines):
  

  omapi-port 7911;

• configure the settings file to point to your dhcpd.conf and dhcpd.leases files (make sure they are readable by the smart-proxy user)
• make sure the omshell command (/usr/bin/omshell) can be executed by the smart-proxy user.

Securing the dhcp API¶

The dhcpd api server will listen to any host. You might need to add a omapi_key to provide basic security.

Example generating a key (on CentOS):

> yum install bind97
> dnssec-keygen -r /dev/urandom -a HMAC-MD5 -b 512 -n HOST omapi_key
> cat Komapi_key.+*.private |grep ^Key|cut -d ' ' -f2-

1- Edit your "/etc/dhcpd.conf":

omapi-port 7911;
key omapi_key {
algorithm HMAC-MD5;
secret "XXXXXXXXX"; #<-The output from the generated key above.
};
omapi-key omapi_key;

2- Make sure you also add the omapi_key to your proxy's [[Smart-Proxy:Settingsyml#DHCP-section|settings.yml]]

3- Restart the dhcpd and foreman-proxy services

Testing¶

If everything works, you could browse your dhcp server data if you goto http://proxy:8443/dhcp

The next step is to set up appropriate Subnets in Foreman from the settings menu.

Sample dhcpd.conf