iPXE Provisioning of a host fails with DHCP reporting 'no free leases' on Red Hat Satellite 6.10

Environment

• Red Hat Satellite 6.10

Issue

• iPXE Provisioning of a host fails with DHCP reporting the following errors:

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May 17 09:06:42 example.satellite.com dhcpd[7843]: DHCPDISCOVER from 00:50:56:84:35:d5 via ens224: network 192.168.21.0/24: no free leases
May 17 09:07:03 example.satellite.com dhcpd[7843]: DHCPDISCOVER from 00:50:56:84:35:d5 via ens224: network 192.168.21.0/24: no free leases
May 17 09:07:15 example.satellite.com dhcpd[7843]: DHCPDISCOVER from 00:50:56:84:35:d5 via ens224: network 192.168.21.0/24: no free leases
May 17 09:11:29 example.satellite.com dhcpd[7843]: DHCPREQUEST for 192.168.21.14 from 00:50:56:84:90:13 via ens224: unknown lease 192.168.21.14.
May 17 09:11:31 example.satellite.com dhcpd[7843]: DHCPDISCOVER from 00:50:56:84:90:13 via ens224: network 192.168.21.0/24: no free leases
May 17 09:11:34 example.satellite.com dhcpd[7843]: DHCPDISCOVER from 00:50:56:84:90:13 via ens224: network 192.168.21.0/24: no free leases
.
.

• Hosts are not getting IP addresses from the DHCP (Satellite server).
• When I try to create a new host, in the Interfaces tab, there will be a new IP on the install network, let's say 192.168.21.10, but that IP never shows up in the /var/lib/dhcpd/dhcpd.leases file.

Resolution

Edit the /etc/dhcp/dhcpd.conf on the Satellite server, and make sure to add the 'range' line as shown below:

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.
subnet 192.168.21.0 netmask 255.255.255.0 {

  option subnet-mask 255.255.255.0;
  range 192.168.21.0 192.168.21.255;
}

Afterwards, restart the DHCP service.

For more KB articles/solutions related to Red Hat Satellite 6.x Provisioning Issues, please refer to the Consolidated Troubleshooting Article for Red Hat Satellite 6.x Provisioning related Issues

Diagnostic Steps

• Checking the /var/lib/dhcpd/dhcpd.leases file revealed that there was only one entry. So, there should be free leases available.

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