Centos /Cloudlinux 7 error restarting a systemd service

/in /by

Unable to register authentication agent

** (pkttyagent:478736): WARNING **: 18:16:34.777: Unable to register authentication agent: GDBus.Error:org.freedesktop.PolicyKit1.Error.Failed: Cannot determine user of subject Error registering authentication agent: GDBus.Error:org.freedesktop.PolicyKit1.Error.Failed: Cannot determine user of subject (polkit-error-quark, 0)

# groupadd -g 23 nohidproc
# usermod -a -G nohidproc polkitd
# mount -o remount,rw,hidepid=2,gid=nohidproc /proc
# systemctl restart polkit

 

 

nano /etc/fstab
# comment the following line :
from : proc /proc proc defaults,hidepid=2 0 0
to : # proc /proc proc defaults,hidepid=2 0 0
# add the following line
proc /proc proc defaults,hidepid=2,gid=nohidproc 0 0

Add MX Record with Custom Priority for Plesk

/in /by 
/sbin/plesk bin dns -a abc.com -mx "" -mailexchanger mail.abc.com -priority 1

Fix the glibc error at boot

/in /by

Environment: Centos 7 Boot Process

Error : System Hanging at “Starting Switch Root”,Boot fails.

Solution: Replace/Reinstall glibc-x.x.x.el7.x86.64 package after boot your server with centos rescue dvd / cd / iso image

rpm -ivh –root=/mnt/sysimage –replacefiles –replacepkgs /run/install/repo/Packages/glibc-x.x.x.el7.x86.64.rpm