cPanel: Failed at step NAMESPACE spawning /usr/bin/mysqld_pre_systemd: Cannot allocate memory

cPanel, mysql error, openvz container

Failed at step NAMESPACE spawning /usr/bin/mysqld_pre_systemd: Cannot allocate memory

error occurs when jailed Apache enabled

check /proc/mounts limits

BORG backup: restrict client commands on remote SSH

Add on backup server to .ssh/authorized_keys:

command="borg serve --restrict-to-path /home/USER/REPO.borg",no-pty,no-agent-forwarding,no-port-forwarding,no-X11-forwarding,no-user-rc ssh-rsa KEY

cPanel DNS cluster - force sync zones to cPanel Slave Only from command line

1. Enable DNS cluster
2. Add cPanel Slave Only to MASTER as 'Synchronize changes'
3. Run from command line on master:

/usr/local/cpanel/scripts/dnscluster syncall --full

Check how many zones listed on slave:

[12:07:15 SLAVE root@XXXXXX ~]cPs# /usr/local/cpanel/whostmgr/bin/dnsadmin --action GETZONELIST --localonly|wc -l
1300

Recreate /boot directory on Centos 7

chroot / rescue / whatever

mv /boot{,.old}
mkdir -p /boot
chmod 0555 /boot
yum reinstall kernel -y
grub2-install /dev/xxx
grub2-mkconfig /boot/grub2/grub.cfg
ln -s /boot/grub2/grub.cfg /etc/grub2.cfg