The system role is transactional server, so root file system is readonly.

===
susetest:~ # cat /etc/*release
NAME="openSUSE Leap"
VERSION="15.4"
ID="opensuse-leap"
ID_LIKE="suse opensuse"
VERSION_ID="15.4"
PRETTY_NAME="openSUSE Leap 15.4"
ANSI_COLOR="0;32"
CPE_NAME="cpe:/o:opensuse:leap:15.4"
BUG_REPORT_URL="https://bugs.opensuse.org"
HOME_URL="https://www.opensuse.org/"
DOCUMENTATION_URL="https://en.opensuse.org/Portal:Leap"
LOGO="distributor-logo-Leap"
susetest:~ # rpm -qa|grep kdump
yast2-kdump-4.4.4-150400.3.3.1.x86_64
kdump-1.0.2+git14.gb49d4a3-150400.3.5.1.x86_64
susetest:~ # uname -r
5.14.21-150400.24.28-default
===

susetest:~ # systemctl restart kdump
Job for kdump.service failed because the control process exited with error
code.
See "systemctl status kdump.service" and "journalctl -xeu kdump.service" for
details.
susetest:~ # journalctl -xeu kdump.service
������������������ Support: https://lists.freedesktop.org/mailman/listinfo/systemd-devel
������������������ 
������������������ An ExecStart= process belonging to unit kdump.service has exited.
������������������ 
������������������ The process' exit code is 'exited' and its exit status is 1.
Nov 17 01:54:16 susetest systemd[1]: kdump.service: Failed with result
'exit-code'.
������������������ Subject: Unit failed
������������������ Defined-By: systemd
������������������ Support: https://lists.freedesktop.org/mailman/listinfo/systemd-devel
������������������ 
������������������ The unit kdump.service has entered the 'failed' state with result
'exit-code'.
Nov 17 01:54:16 susetest systemd[1]: Failed to start Load kdump kernel and
initrd.
������������������ Subject: A start job for unit kdump.service has failed
������������������ Defined-By: systemd
������������������ Support: https://lists.freedesktop.org/mailman/listinfo/systemd-devel
������������������ 
������������������ A start job for unit kdump.service has finished with a failure.
������������������ 
������������������ The job identifier is 880 and the job result is failed.
Nov 17 01:56:58 susetest systemd[1]: Starting Load kdump kernel and initrd...
������������������ Subject: A start job for unit kdump.service has begun execution
������������������ Defined-By: systemd
������������������ Support: https://lists.freedesktop.org/mailman/listinfo/systemd-devel
������������������ 
������������������ A start job for unit kdump.service has begun execution.
������������������ 
������������������ The job identifier is 1068.
Nov 17 01:56:59 susetest load.sh[15275]: Regenerating kdump initrd ...
Nov 17 01:56:59 susetest load.sh[15275]: dracut: Executing: /usr/bin/dracut
--force --hostonly --no-hostonly-default-device --omit "plymouth resume
usrmount" --compress "xz -0 --check=crc32" --add kdump
/boot/initrd-5.14.21-150400.24.28->
Nov 17 01:56:59 susetest load.sh[15275]: dracut: No permission to write to
/boot.
Nov 17 01:56:59 susetest systemd[1]: kdump.service: Main process exited,
code=exited, status=1/FAILURE
������������������ Subject: Unit process exited
������������������ Defined-By: systemd
������������������ Support: https://lists.freedesktop.org/mailman/listinfo/systemd-devel
������������������ 
������������������ An ExecStart= process belonging to unit kdump.service has exited.
������������������ 
������������������ The process' exit code is 'exited' and its exit status is 1.
Nov 17 01:56:59 susetest systemd[1]: kdump.service: Failed with result
'exit-code'.
������������������ Subject: Unit failed
������������������ Defined-By: systemd
������������������ Support: https://lists.freedesktop.org/mailman/listinfo/systemd-devel
������������������ 
������������������ The unit kdump.service has entered the 'failed' state with result
'exit-code'.
Nov 17 01:56:59 susetest systemd[1]: Failed to start Load kdump kernel and
initrd.
������������������ Subject: A start job for unit kdump.service has failed
������������������ Defined-By: systemd
������������������ Support: https://lists.freedesktop.org/mailman/listinfo/systemd-devel
������������������ 
������������������ A start job for unit kdump.service has finished with a failure.
������������������ 
������������������ The job identifier is 1068 and the job result is failed.