Add repository for NSD to get newer version and install
<code>
add-apt-repository ppa:ondrej/pkg-nlnetlabs
apt install nsd pdns-server pdns-backend-mysql
</code>

<code>
ufw status verbose
ufw default deny incoming
ufw default allow outgoing
ufw allow ssh
ufw allow 53
ufw allow 60000:61000/udp
ufw allow from 37.59.105.146 to any port 6556 proto tcp
ufw allow from 2001:41d0:302:2200::583 to any port 6556 proto tcp
ufw enable
ufw status verbose
</code>

Install PHP packages for the tools in /opt/hostinggl
<code>
apt install php-cli php-mysql php-intl php-sqlite3
</code>

Add users for the CPanel servers. They are transfering zones to the Master, so make sure it works.
<code>
adduser cpanel1
adduser cpanel2
</code>

<code>
</code>