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<!-- The actual name of your feature page should look something like: Features/YourFeatureName.  This keeps all features in the same namespace -->
<!-- The actual name of your feature page should look something like: Features/YourFeatureName.  This keeps all features in the same namespace -->
= New mkdumprd for kdump <!-- The name of your feature --> =
== Summary ==
This is a replacement for mkdumprd of kexec-tools, to switch to dracut to generate the initrd for kdump kernel.
== Owner ==
* Name: [[User:wangcong| Cong Wang]]
<!-- Include you email address that you can be reached should people want to contact you about helping with your feature, status is requested, or  technical issues need to be resolved-->
* Email: <amwang at redhat dot com>
== Current status ==
* Targeted release: [[Releases/16 | Fedora 16 ]]
* Last updated: 2011-07-11
* Percentage of completion: 10%
Working:
* Dump to local filesystem
TODO:
* Read /etc/kdump.conf to generate initrd
* Dump to remote host via ssh
* Dump to remote host via nfs
* Dump to raw block device
* Implement full functionality of /etc/kdump.conf
* Dump to multiple targets
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== Detailed Description ==
Currently in kexec-tools we use our own /sbin/mkdumprd to generate an initrd for kdump kernel. However, due to the natural complexity of making a new initrd, we have lots of burdens to maintain the mkdumprd code, we decide to switch to using dracut to generate kdump initrd. And hopefully, we can provide a distro-independent mkdumprd to upstream, as dracut itself is cross-distribution.
== Benefit to Fedora ==
The main source of kexec-tools bugs is in mkdumprd, with this change, hopefully we will reduce the number of bugs of kexec-tools.
== Scope ==
All functionality of /sbin/mkdumprd has to be implemented and tested in this new mkdumprd.
== How To Test ==
Enable some of the following config lines in /etc/kdump.conf
* Dump to local file system
ext3 LABEL=/boot
ext3 /dev/sda1
ext4 UUID=03138356-5e61-4ab3-b58e-27507ac41937
* Dump to remote machines
net my.server.com:/path
net user@remote.server.com
* Dump to raw block device
raw /dev/sda5
* Other configs
core_collector makedumpfile -c --message-level 1
core_collector cp
kdump_post /var/crash/scripts/kdump-post.sh
extra_bins /bin/cp
disk_timeout 30
extra_modules gfs2
options modulename options
default shell/reboot/shutdown
Trigger a crash and see if the vmcore is dumped to the right place.
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== User Experience ==
Users should not notice the replacement, because we plan to provide full backward compatibility.
== Dependencies ==
Dracut
== Contingency Plan ==
Fallback to old /sbin/mkdumprd.
== Documentation ==
* Not applicable, because we don't have any documentations for this replacement.
== Release Notes ==
<!-- The Fedora Release Notes inform end-users about what is new in the release.  Examples of past release notes are here: http://docs.fedoraproject.org/release-notes/ -->
<!-- The release notes also help users know how to deal with platform changes such as ABIs/APIs, configuration or data file formats, or upgrade concerns.  If there are any such changes involved in this feature, indicate them here.  You can also link to upstream documentation if it satisfies this need.  This information forms the basis of the release notes edited by the documentation team and shipped with the release. -->
* /sbin/mkdumprd has been replaced by new code, which uses dracut to generate the initrd for kdump kernel.


== Comments and Discussion ==
== Comments and Discussion ==
* Not applicable, because the main discussion is in a Red Hat internal mailing list.
* Comments and discussion are welcome!
 
 
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Latest revision as of 02:57, 13 July 2011


Comments and Discussion

  • Comments and discussion are welcome!