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kexec-kdump-howto: Add doc about the special mount information via "dracut_args" 

Update "kexec-kdump-howto" to illustrate the usage of special mount
information via "dracut_args".

Reviewed-by: Pratyush Anand <panand@redhat.com>
Suggested-by: Dave Young <dyoung@redhat.com>
Acked-by: Dave Young <dyoung@redhat.com>
Signed-off-by: Xunlei Pang <xlpang@redhat.com>
This commit is contained in:
Xunlei Pang 2016-08-26 11:47:38 +08:00 committed by Dave Young
parent 74c6f46429
commit b22ed8dd3a
1 changed files with 18 additions and 0 deletions
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kexec-kdump-howto.txt
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@ -345,6 +345,24 @@ mount the NFS mount and copy out the vmcore to your NFS server. Restart the
kdump service via '/sbin/systemctl restart kdump.service' to commit this change
to your kdump initrd.
Special mount via "dracut_args"
You can utilize "dracut_args" to pass "--mount" to kdump, see dracut manpage
about the format of "--mount" for details. If there is any "--mount" specified
via "dracut_args", kdump will build it as the mount target without doing any
validation (mounting or checking like mount options, fs size, save path, etc),
so you must test it to ensure all the correctness. You cannot use other targets
in /etc/kdump.conf if you use "--mount" in "dracut_args". You also cannot specify
mutliple "--mount" targets via "dracut_args".
One use case of "--mount" in "dracut_args" is you do not want to mount dump target
before kdump service startup, for example, to reduce the burden of the shared nfs
server. Such as the example below:
dracut_args --mount "192.168.1.1:/share /mnt/test nfs4 defaults"
NOTE:
- <mountpoint> must be specified as an absolute path.
Remote system via ssh/scp
Dumping over ssh/scp requires setting up passwordless ssh keys for every