cd7264705d
Currently, when generating a kdump initramfs, mkdumprd will determine how much disk space is available, if the dump target's available space is not greater than the total system memory, mkdumprd will print a warning to remind that there might not be enough space to save a vmcore. Some users are complaining that mkdumprd overestimates the needed size. But actually, the warning covers extreme scenarios such as the slab explodes with non-zero data or a full vmcore, etc. Therefore, need to prevent users from having minimum disk space for crash dump. In view of this, add some descriptions to clarify it in mkdumprd man page. Signed-off-by: Lianbo Jiang <lijiang@redhat.com> Acked-by: Kairui Song <kasong@redhat.com>
40 lines
1.7 KiB
Groff
40 lines
1.7 KiB
Groff
.TH MKDUMRD 8 "Fri Feb 9 2007"
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.SH NAME
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mkdumprd \- creates initial ramdisk images for kdump crash recovery
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.SH SYNOPSIS
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\fBmkdumprd\fR [OPTION]
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.SH DESCRIPTION
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\fBmkdumprd\fR creates an initial ram file system for use in conjunction with
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the booting of a kernel within the kdump framework for crash recovery.
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\fBmkdumprds\fR purpose is to create an initial ram filesystem capable of copying
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the crashed systems vmcore image to a location specified in \fI/etc/kdump.conf
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\fBmkdumprd\fR interrogates the running system to understand what modules need to
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be loaded in the initramfs (based on configuration retrieved from
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\fI/etc/kdump.conf)\fR
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\fBmkdumprd\fR add a new \fBdracut\fR module 99kdumpbase and use \fBdracut\fR
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utility to generate the initramfs. When generating a kdump initramfs, \fBmkdumprd\fR
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will determine how much disk space is available, if the dump target's available
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space is not greater than the total system memory, \fBmkdumprd\fR will print a
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warning to remind that there might not be enough space to save a vmcore. The
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warning covers extreme scenarios such as the slab explodes with non-zero data or
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a full vmcore, etc. Therefore, need to prevent users from having minimum disk
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space for crash dump.
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\fBmkdumprd\fR was not intended for casual use outside of the service
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initialization script for the kdump utility, and should not be run manually. If
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you require a custom kdump initramfs image, it is suggested that you use the
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kdump service infrastructure to create one, and then manually unpack, modify and
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repack the image.
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.SH OPTIONS
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.TP
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All options here are passed to dracut directly, please refer \fBdracut\fR docs
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for the info.
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.SH "SEE ALSO"
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.BR dracut (8)
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