Talk:Features/NewMkdumprd

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= 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 ==
 
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* /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.
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* Comments and discussion are welcome!
 
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Latest revision as of 02:57, 13 July 2011


[edit] Comments and Discussion

  • Comments and discussion are welcome!