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module-setup.sh: Instead of drop journalctl log, just don't read kmsg 

Previously journalctl logs are directly dropped to save memory, but this
make journalctl unusable in kdump kernel and diffcult to debug. So
instead just don't let it read kmsg but keep other logs stored as volatile.

Kernel message are already stored in the kernel log ring buffer,
no need to let journalctl make a copy, especially when in kdump
kernel, ususlly there won't be too much kernel log overlapping
the old ring buffer.

Signed-off-by: Kairui Song <kasong@redhat.com>
Acked-by: Lianbo Jiang <lijiang@redhat.com>
This commit is contained in:
Kairui Song 2020-10-27 15:00:45 +08:00
parent d4c6f56456
commit 46cc7f46b2
1 changed files with 5 additions and 4 deletions
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9
dracut-module-setup.sh
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@ -799,13 +799,14 @@ kdump_install_systemd_conf() {
echo "DefaultTimeoutStartSec=300s" >> ${initdir}/etc/systemd/system.conf.d/kdump.conf
fi
# Forward logs to console directly, this avoids unneccessary memory
# consumption and make console output more useful.
# Forward logs to console directly, and don't read Kmsg, this avoids
# unneccessary memory consumption and make console output more useful.
# Only do so for non fadump image.
if ! is_fadump_capable && [ "$failure_action" != "shell" ]; then
if ! is_fadump_capable; then
mkdir -p ${initdir}/etc/systemd/journald.conf.d
echo "[Journal]" > ${initdir}/etc/systemd/journald.conf.d/kdump.conf
echo "Storage=none" >> ${initdir}/etc/systemd/journald.conf.d/kdump.conf
echo "Storage=volatile" >> ${initdir}/etc/systemd/journald.conf.d/kdump.conf
echo "ReadKMsg=no" >> ${initdir}/etc/systemd/journald.conf.d/kdump.conf
echo "ForwardToConsole=yes" >> ${initdir}/etc/systemd/journald.conf.d/kdump.conf
fi
}