Red Hat Summit3.2. Satellite and DHCP Options
Satellite manages DHCP reservations through a DHCP Capsule. Satellite also sets the next-server and filename DHCP options.
The next-server option
The next-server option provides the IP address of the TFTP server to boot from. This option is not set by default and must be set for each TFTP Capsule. You can use the satellite-installer command with the --foreman-proxy-tftp-servername option to set the TFTP server in the /etc/foreman-proxy/settings.d/tftp.yml file:
satellite-installer --foreman-proxy-tftp-servername 1.2.3.4
# satellite-installer --foreman-proxy-tftp-servername 1.2.3.4Each TFTP Capsule then reports this setting through the API and Satellite can retrieve the configuration information when it creates the DHCP record.
When the PXE loader is set to none, Satellite does not populate the next-server option into the DHCP record.
If the next-server option remains undefined, Satellite uses reverse DNS search to find a TFTP server address to assign, but you might encounter the following problems:
- DNS timeouts during provisioning
- Querying of incorrect DNS server. For example, authoritative rather than caching
-
Errors about incorrect IP address for the TFTP server. For example,
PTR record was invalid
If you encounter these problems, check the DNS setup on both Satellite and Capsule, specifically the PTR record resolution.
The filename option
The filename option contains the full path to the file that downloads and executes during provisioning. The PXE loader that you select for the host or host group defines which filename option to use. When the PXE loader is set to none, Satellite does not populate the filename option into the DHCP record. Depending on the PXE loader option, the filename changes as follows:
| PXE loader option | filename entry | Notes |
|---|---|---|
| PXELinux BIOS |
| |
| PXELinux UEFI |
| |
| iPXE Chain BIOS |
| |
| PXEGrub2 UEFI |
| x64 can differ depending on architecture |
| iPXE UEFI HTTP |
|
Requires the |
| Grub2 UEFI HTTP |
|
Requires the |
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