4.2.2. Configuring Capsule Server with an External DHCP Server

Procedure

1. Install the nfs-utils utility:

   # yum install nfs-utils

2. Create the DHCP directories for NFS:

   # mkdir -p /mnt/nfs/etc/dhcp /mnt/nfs/var/lib/dhcpd

3. Change the file owner:

   # chown -R foreman-proxy /mnt/nfs

4. Verify communication with the NFS server and the Remote Procedure Call (RPC) communication paths:

   # showmount -e DHCP_Server_FQDN
   # rpcinfo -p DHCP_Server_FQDN

5. Add the following lines to the /etc/fstab file:

   DHCP_Server_FQDN:/exports/etc/dhcp /mnt/nfs/etc/dhcp nfs
   ro,vers=3,auto,nosharecache,context="system_u:object_r:dhcp_etc_t:s0" 0 0
   
   DHCP_Server_FQDN:/exports/var/lib/dhcpd /mnt/nfs/var/lib/dhcpd nfs
   ro,vers=3,auto,nosharecache,context="system_u:object_r:dhcpd_state_t:s0" 0 0

6. Mount the file systems on /etc/fstab:

   # mount -a

7. To verify that the foreman-proxy user can access the files that are shared over the network, display the DHCP configuration and lease files:

   # su foreman-proxy -s /bin/bash
   bash-4.2$ cat /mnt/nfs/etc/dhcp/dhcpd.conf
   bash-4.2$ cat /mnt/nfs/var/lib/dhcpd/dhcpd.leases
   bash-4.2$ exit

8. Enter the satellite-installer command to make the following persistent changes to the /etc/foreman-proxy/settings.d/dhcp.yml file:

   # satellite-installer --foreman-proxy-dhcp=true \
   --foreman-proxy-dhcp-provider=remote_isc \
   --foreman-proxy-plugin-dhcp-remote-isc-dhcp-config /mnt/nfs/etc/dhcp/dhcpd.conf \
   --foreman-proxy-plugin-dhcp-remote-isc-dhcp-leases /mnt/nfs/var/lib/dhcpd/dhcpd.leases \
   --foreman-proxy-plugin-dhcp-remote-isc-key-name=omapi_key \
   --foreman-proxy-plugin-dhcp-remote-isc-key-secret=jNSE5YI3H1A8Oj/tkV4...A2ZOHb6zv315CkNAY7DMYYCj48Umw== \
   --foreman-proxy-plugin-dhcp-remote-isc-omapi-port=7911 \
   --enable-foreman-proxy-plugin-dhcp-remote-isc \
   --foreman-proxy-dhcp-server=DHCP_Server_FQDN

9. Restart the foreman-proxy service:

   # systemctl restart foreman-proxy

10. Log in to the Satellite Server web UI.
11. Navigate to Infrastructure > Capsules, locate the Capsule Server, and from the list in the Actions column, select Refresh.
12. Associate the DHCP service with the appropriate subnets and domain.