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f8d3e5069a
* Provide a dracut module and a systemd service for Fedora, RHEL and SLES. * Provide a systemd service for Ubuntu. Signed-off-by: Alexander Egorenkov <egorenar@linux.ibm.com> Reviewed-by: Philipp Rudo <prudo@linux.ibm.com> Acked-by: Jan Höppner <hoeppner@linux.ibm.com> Signed-off-by: Jan Höppner <hoeppner@linux.ibm.com>
Setup
Configure crashkernel
sudo grubby --args "crashkernel=512M" --update-kernel=ALL
sudo reboot
Production kernel's root file system
- kdump mounts the production kernel's root file system under /sysroot.
Dependencies
sudo dnf install -y fuse fuse-devel systemd-devel
Build hsavmcore
make -C s390-tools/hsavmcore
Install hsavmcore
sudo cp s390-tools/hsavmcore/hsavmcore /usr/sbin/
Create swap file
sudo dd if=/dev/zero of=/var/crash/swap.img bs=1M count=1024
sudo mkswap /var/crash/swap.img
Install hsavmcore.conf
Test configuration
- Doesn't require HSA support
HSA cache in file
cat <<EOF | sudo tee /etc/hsavmcore.conf
verbose = 2
workdir = /sysroot/var/crash
use_hsa_mem = 0
mount_debugfs = 1
hsa_size = 0x1ffff000
release_hsa = 0
bind_mount_vmcore = 1
EOF
HSA cache in memory
cat <<EOF | sudo tee /etc/hsavmcore.conf
verbose = 2
workdir = /sysroot/var/crash
use_hsa_mem = 1
mount_debugfs = 1
hsa_size = 0x1ffff000
release_hsa = 0
bind_mount_vmcore = 1
swap = /sysroot/var/crash/swap.img
EOF
Production configuration
- Works only on s390x
HSA cache in file
cat <<EOF | sudo tee /etc/hsavmcore.conf
verbose = 2
workdir = /sysroot/var/crash
use_hsa_mem = 0
mount_debugfs = 1
hsa_size = -1
release_hsa = 1
bind_mount_vmcore = 1
EOF
HSA cache in memory
cat <<EOF | sudo tee /etc/hsavmcore.conf
verbose = 2
workdir = /sysroot/var/crash
use_hsa_mem = 1
mount_debugfs = 1
hsa_size = -1
release_hsa = 1
bind_mount_vmcore = 1
swap = /sysroot/var/crash/swap.img
EOF
Install new dracut module
sudo cp -r s390-tools/hsavmcore/initramfs/fedora-rhel/dracut/modules.d/99hsavmcore /lib/dracut/modules.d/
Add the new dracut module as a dependency to the dracut module kdumpbase
sudo sed -e 's#local _dep="base shutdown"#local _dep="base shutdown hsavmcore"#' \
-i /lib/dracut/modules.d/99kdumpbase/module-setup.sh
Rebuild kdump initramfs
sudo kdumpctl rebuild
Enable swap LVM in kdump
- Required if you want to use a swap device in kdump
sudo sed -e 's#^KDUMP_COMMANDLINE_APPEND="\(.*\)"$#KDUMP_COMMANDLINE_APPEND="\1 rd.lvm.lv=rhel/swap"#' \
-i /etc/sysconfig/kdump
Reload kdump
sudo kdumpctl reload
Test
echo N | sudo tee /sys/module/kernel/parameters/crash_kexec_post_notifiers
echo c | sudo tee /proc/sysrq-trigger