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Bug 1527806 - Updating PXE loader causes DHCP conflicts
Summary: Updating PXE loader causes DHCP conflicts
Keywords:
Status: CLOSED ERRATA
Alias: None
Product: Red Hat Satellite
Classification: Red Hat
Component: DHCP & DNS
Version: 6.3.0
Hardware: Unspecified
OS: Unspecified
unspecified
medium
Target Milestone: Unspecified
Assignee: Lukas Zapletal
QA Contact:
URL: http://projects.theforeman.org/issues...
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2017-12-20 07:44 UTC by Lukas Zapletal
Modified: 2019-04-01 20:27 UTC (History)
4 users (show)

Fixed In Version: foreman-1.15.6.26-1
Doc Type: If docs needed, set a value
Doc Text:
Clone Of:
Environment:
Last Closed: 2018-02-21 16:54:37 UTC
Target Upstream Version:
Embargoed:

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Links
System ID Private Priority Status Summary Last Updated
Foreman Issue Tracker 21120 0 None None None 2017-12-20 08:01:09 UTC

Description Lukas Zapletal 2017-12-20 07:44:03 UTC 
Whenever we chage the bootloader from Grub2 UEFI to PXELinux BIOS, or vice versa, the foreman smart proxy start creating duplicate dhcp entries for this host.

how to repoduce:

1. create host with PXELinux BIOS bootloader
2. modify host to to use Grub2 UEFI
2. press submit (you will get a modal saying there already is a dhcp enty, and if you like to overwrite it)
3. acknowledge the modal and press the "overwrite" botton
4. now the "submit" button of the host is named "overwrite" -> press it
5. you will get a error message, complaining about a HTTP 409 from the dhcp smart proxy

if you check the leases file of the dhcp server, you will now have at least 2 entries for the same host. i have already see up to 33 entries for the same host within a file.

it also seems that the deleting a host will not always remove a entry from the dhcp leases file, but i have to admit that i am not 100% sure if the host will directly disappear from the leases file after it has been deleted.

to "fix" the issue, you have to:
- delete the host
- stop dhcpd
- remove broken entries from leases file
- start dhcpd
- recreate the host
Comment 4 Satellite Program 2018-02-21 16:54:37 UTC 
Since the problem described in this bug report should be resolved in a recent advisory, it has been closed with a resolution of ERRATA.
> > 
> > For information on the advisory, and where to find the updated files, follow the link below.
> > 
> > If the solution does not work for you, open a new bug report.
> > 
> > https://access.redhat.com/errata/RHSA-2018:0336
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