Problems.v7

Installing

New Server

Mrepo

smartd

RAID

Hardening

YUM

Crontabs

LogWatch

systemctl

firewalld

CentOS 7

Packages

Apache

Bind

Cacti

DHCP

mariadb

Samba

Sarg

Sendmail

Smokeping

Rsync

Work Apps

Problems

VPN

VPN Win

Extras

Bash

MailScanner

Horde

Google CE

Wake Up

KVM

Other

Computer Lab

ISO2USB

aiContact

Google CE

Android

USB Live

SRS XML

Lovely Problems

How to boot in to rescue mode.

https://www.thegeekdiary.com/centos-rhel-7-how-to-boot-into-rescue-mode-or-emergency-mode/

BIOS corrupted hw-PMU

Hattip: https://www.serveradminblog.com/2015/04/firmware-bug-the-bios-has-corrupted-hw-pmu-resources/

Wash, ProLiant

How to disable “Processor Power and Utilization Monitoring”:

• enter BIOS (press F9 during boot)
• press CTRL+A (Service Option is hidden by default)
• select “Service Options” -> Processor Power and Utilization Monitoring -> Disable

Press F10 to save and exit and reboot the server.

Warning could not boot

/dev/mapper/wash_root does not exist

After a power out and a systems crash, the boot up can not find the file system.

First we need to determine where the system is looking for /dev/mapper/wash_root, which in this case is a LVM on a raid array.

Possible answers https://centos.org/forums/viewtopic.php?t=63043

darcut -f

to force an Overwrite existing initramfs file.

Booting from LIVEusb

• https://unix.stackexchange.com/questions/425045/warning-dev-centos-root-swap-centos-root-does-not-exist-after-configuring-dr

lvm vgscan
lvm vgchange -ay [be careful]
exit

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