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== Startup Troubleshooting ===== failed to start crash recovery kernel arming ===Problems after power loss or crash, the crash kernel error message. You can fix by making simple change to grub and reboot. vi /etc/default/grubchange "crash kernel=auto" to "crash kernel=512M" then type the following command grub2-mkconfig -o /boot/grub2/grub.cfg=== sshd or other service wont start because system clock is wrong ===Some useful commands to correct system clock so services run correctly. hwclock -r shows cmos time date +%Y%m%d -s "20170618" set the linux date date +%T -s "19:25:00" set the linux time hwclock -w force cmos clock to match linux clock hwclock -hctosys force linux clock to match cmos clock