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Description of problem:
We are moving to use anaconda addon and removing kdump firstboot module, thus kdump guide need update. There's several places need change:
1. remove firstboot part
2. document about kdump anaconda addon, the difference is user can configure kdump crashkernel reservation and enable/disable kdump in installation phase instead of the firstboot after installation finished, it will save one reboot cycle for crashkernel= changes
In new anaconda addon we have no kdump.conf change interface like what's in firstboot. User need run system-config-kdump to change kdump.conf options or modify /etc/kdump.conf manually and restart kdump.service by systemctl restart kdump.service
3. Previously we have a rhcrashkernel-param script which was installed as /usr/sbin/rhcrashkernel-param which will be used by ananconda to append crashkernel=auto to /etc/default/grub. But with new kdump anaconda addon the addon will take care of passing crashkernel= to grub cmdline. rhcrashkernel-param is useless and anaconda will need to drop the callback, we will remove the rhcrashkernel-param in kexec-tools.
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