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Documentation: step by step guide on confiuring kdump in live images

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This is a short document about how to setup kdump on live images. All
steps were tested on Fedora 25 Alpha LiveCD and saved vmcore captured
by kdump to a USB stick successfully.

Signed-off-by: Tong Li <tonli@redhat.com>
Acked-by: Dave Young <dyoung@redhat.com>
This commit is contained in:
Tong Li 2016-10-25 17:29:43 +08:00 committed by Dave Young
parent 11785bdffb
commit 7e53e9fe38
2 changed files with 26 additions and 0 deletions
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3
kexec-tools.spec
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@ -29,6 +29,7 @@ Source23: kdump-anaconda-addon-005-19-g6577df4.tar.gz
Source24: kdump-lib-initramfs.sh Source24: kdump-lib-initramfs.sh
Source25: kdump.sysconfig.ppc64le Source25: kdump.sysconfig.ppc64le
Source26: kdumpctl.8 Source26: kdumpctl.8
Source27: live-image-kdump-howto.txt
####################################### #######################################
# These are sources for mkdumpramfs # These are sources for mkdumpramfs
@ -154,6 +155,7 @@ rm -f kexec-tools.spec.in
# setup the docs # setup the docs
cp %{SOURCE10} . cp %{SOURCE10} .
cp %{SOURCE21} . cp %{SOURCE21} .
cp %{SOURCE27} .
make make
%ifarch %{ix86} x86_64 ppc64 s390x ppc64le %ifarch %{ix86} x86_64 ppc64 s390x ppc64le
@ -326,6 +328,7 @@ done
%doc TODO %doc TODO
%doc kexec-kdump-howto.txt %doc kexec-kdump-howto.txt
%doc kdump-in-cluster-environment.txt %doc kdump-in-cluster-environment.txt
%doc live-image-kdump-howto.txt
%ifarch %{ix86} x86_64 ppc64 s390x ppc64le %ifarch %{ix86} x86_64 ppc64 s390x ppc64le
%{_libdir}/eppic_makedumpfile.so %{_libdir}/eppic_makedumpfile.so
/usr/share/makedumpfile/eppic_scripts/ /usr/share/makedumpfile/eppic_scripts/

23
live-image-kdump-howto.txt Normal file
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@ -0,0 +1,23 @@
Kdump now works on live images with some manual configurations. Here is the step
by step guide.
1. Enable crashkernel reservation
Since there isn't any config file that can be used to configure kernel
parameters for live images before booting them, we have to append 'crashkernel'
argument in boot menu every time we boot a live image.
2. Change dump target in /etc/kdump.conf
When kdump kernel boots in a live environment, the default target /var/crash is
in RAM so you need to change the dump target to an external disk or a network
dump target.
3. Start kdump service
$ kdumpctl start
4. Trigger a kdump test
$ echo 1 > /proc/sys/kernel/sysrq
$ echo c > /proc/sysrq-trigger