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7.11. Troubleshooting Discovery

If a machine is not listed in the Satellite web UI in Hosts > Discovered Hosts, inspect the following configuration areas to help isolate the error:

  • Navigate to Hosts > Provisioning Templates and redeploy the default PXELinux template using the Build PXE Default button.
  • Verify the pxelinux.cfg/default configuration file on the TFTP Capsule.
  • Ensure adequate network connectivity between hosts, Capsule Server, and Satellite Server.
  • Check the PXELinux template in use and determine the PXE discovery snippet it includes. Snippets are named as follows: pxelinux_discovery, pxegrub_discovery, or pxegrub2_discovery. Verify the proxy.url and proxy.type options in the PXE discovery snippet.
  • Ensure that DNS is working correctly for the discovered nodes, or use an IP address in the proxy.url option in the PXE discovery snippet included in the PXELinux template you are using.
  • Ensure that the DHCP server is delivering IP addresses to the booted image correctly.
  • Ensure the discovered host or virtual machine has at least 1200 MB of memory. Less memory can lead to various random kernel panic errors because the image is extracted in-memory.

For gathering important system facts, use the discovery-debug command. It prints out system logs, network configuration, list of facts, and other information on the standard output. The typical use case is to redirect this output and copy it with the scp command for further investigation.

The first virtual console on the discovered host is reserved for systemd logs. Particularly useful system logs are tagged as follows:

  • discover-host — initial facts upload
  • foreman-discovery — facts refresh, reboot remote commands
  • nm-prepare — boot script which pre-configures NetworkManager
  • NetworkManager — networking information

Use TTY2 or higher to log in to a discovered host. The root account and SSH access are disabled by default, but you can enable SSH and set the root password using the following kernel command-line options in the Default PXELinux template on the APPEND line: 

fdi.ssh=1 fdi.rootpw=My_Password
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