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fadump: improve fadump-howto.txt about remote dump target setup

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While fadump-howto.txt talks about what happens to network interface
name on setting up a remote dump target in FADump mode, it doesn't
explicitly specify the negative consequences of it. Make it explicit
and provide a recommendation to overcome the same.

Signed-off-by: Hari Bathini <hbathini@linux.ibm.com>
Acked-by: Kairui Song <kasong@redhat.com>
This commit is contained in:
Hari Bathini 2021-02-18 14:12:00 +05:30 committed by Kairui Song
parent 596fa0a07f
commit da6f381b08
1 changed files with 10 additions and 6 deletions
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fadump-howto.txt
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@ -224,12 +224,16 @@ Things to remember:
dracut_args --add "network"
4) If FADump is configured to capture vmcore to a remote dump target using SSH
or NFS protocol, the network interface is renamed to kdump-<interface-name>
if <interface-name> is generic, for example, *eth#, or net#. This problem
occurs because the vmcore capture scripts in the initial RAM disk (initrd)
add the kdump- prefix to the network interface name to secure persistent
naming. As the same initrd is used for production kernel boot, the interface
name is changed for the production kernel too.
or NFS protocol, the corresponding network interface '<interface-name>' is
renamed to 'kdump-<interface-name>', if it is generic (like *eth# or net#).
It happens because vmcore capture scripts in the initial RAM disk (initrd)
add the 'kdump-' prefix to the network interface name to secure persistent
naming. And as capture kernel and production kernel use the same initrd in
case of FADump, the interface name is changed for the production kernel too.
This is likely to impact network configuration setup for production kernel.
So, it is recommended to use a non-generic name for a network interface,
before setting up FADump to capture vmcore to a remote dump target based on
that network interface, to avoid running into network configuration issues.
Dump Triggering methods: