In case of fadump, the initramfs image has to be built to boot into
the production environment as well as to offload the active crash dump
to the specified dump target (for boot after crash). As the same image
would be used for both boot scenarios, it could not be built optimally
while accommodating both cases.
Use --include to include the initramfs image built for offloading
active crash dump to the specified dump target. Also, introduce a new
out-of-tree dracut module (99zz-fadumpinit) that installs a customized
init program while moving the default /init to /init.dracut. This
customized init program is leveraged to isolate fadump image within
the default initramfs image by kicking off default boot process
(exec /init.dracut) for regular boot scenario and activating fadump
initramfs image, if the system is booting after a crash.
Signed-off-by: Hari Bathini <hbathini(a)linux.ibm.com>
---
* Applying this patch, the initramfs image built with fadump support
can be too large, without
https://github.com/dracutdevs/dracut/pull/1532
TODO:
* Fix missing ssh identify file /root/.ssh/kdump_id_rsa with
squash not used and remote (ssh) dump target configured.
Changes in V3:
* Removed dependency with squash module by extracting fadump
initramfs to /fadumproot directory.
* Moved code that builds initramfs for fadump to mkfadumprd and
added cleanup support based on inputs from Kairui.
Changes in V2:
* Moved kernel modules installation from install() to installkernel() for
zz-fadumpinit dracut module.
* Updated kexec-tools.spec to install zz-fadumpinit module files appropriately.
* Fixed error check for capture initramfs image isolation with dracut.
dracut-fadump-init-fadump.sh | 20 ++++++++++++++
dracut-fadump-module-setup.sh | 17 ++++++++++++
dracut-module-setup.sh | 6 +---
kdumpctl | 22 +++-------------
kexec-tools.spec | 14 ++++++++++
mkfadumprd | 58 +++++++++++++++++++++++++++++++++++++++++
6 files changed, 115 insertions(+), 22 deletions(-)
create mode 100644 dracut-fadump-init-fadump.sh
create mode 100644 dracut-fadump-module-setup.sh
create mode 100644 mkfadumprd
diff --git a/dracut-fadump-init-fadump.sh b/dracut-fadump-init-fadump.sh
new file mode 100644
index 0000000..736a7dd
--- /dev/null
+++ b/dracut-fadump-init-fadump.sh
@@ -0,0 +1,20 @@
+#!/bin/sh
+PATH=/bin:/sbin
+
+[ -e /proc/self/mounts ] \
+ || (mkdir -p /proc && mount -t proc -o nosuid,noexec,nodev proc /proc)
+
+grep -q '^sysfs /sys sysfs' /proc/self/mounts \
+ || (mkdir -p /sys && mount -t sysfs -o nosuid,noexec,nodev sysfs /sys)
+
+# If system is booting after a crash, switch to initramfs built for dump capture
+if [ -f /proc/device-tree/rtas/ibm,kernel-dump ] || [ -f
/proc/device-tree/ibm,opal/dump/mpipl-boot ]; then
+ mkdir -p /newroot
+ mount -t ramfs ramfs /newroot
Similar to the dracut --include issue, this would also leave behind
filenames beginning with '.'. As replacing '*' with '.' won't
work,
probably need to use different wildcards...
Thanks
Hari