Description of problem:
By default in /etc/kdump.conf kdump target is set to /var/crash. But this default doesn't work in Node and when you try to start kdump service, following error appears:
# service kdump start
No kdump initial ramdisk found.[WARNING]
mount: /dev/mapper/live-rw already mounted or /tmp/tmp.WCE4ysGYog busy
mount: according to mtab, /dev/mapper/live-rw is mounted on /
/etc/kdump.conf: Bad mount point UUID=ae24299b-205f-4434-89ad-c1e5f2a222e6
Failed to run mkdumprd
This behavior breaks compatibility with kdump behavior on Fedora/RHEL/Centos, where local crashdump is set correctly by default. It also forces sysadmin:
1. Select NFS as kdump target using kdump_nfs kernel command line parameter or
2. Login to host and use UI to configure kdump target.
Version-Release number of selected component (if applicable):
Steps to Reproduce:
1. Install node with default boot parameters (without kdump_nfs)
2. Login as root and try to start kdump service
Kdump service cannot be started due to error mentioned above
Kdump service can be started with default target after installation
There are several options how to solve this:
1. Provide /etc/kdump.conf with working local kdump target by default (this is the best idea IMO)
2. Provide kernel boot parameter to configure local kdump target on installation
kdump_local=y should already work for autoinstalls.
We can ship a kdump config which matches the configuration set if you configure it through the TUI, though to be clear, it will not work during the install itself. Will that work?
Thanks Ryan, I didn't know about kdump_local parameter, because the only documentation describing node specific kernel command line parameters I found was RHEVH 3.2 Hypervisor deployment guide :-( and there's only kdump_nfs param.
Anyway I just tested kdump_local parameter and it works fine. If this parameter was specified during installation, once installation finishes, host can be added to oVirt using host deploy without any manual intervention, so that's great.
Now, is it possible to make this parameter to be enabled by default? I mean when sysadmin prepares PXE setup, he wouldn't need to add this param manually.
A patch is up to enable it by default, and add a parameter (disable_kdump) which flags kdump off at install.
oVirt 3.5 has been released and should include the fix for this issue.