Setup:

Every hosts needs

openssh server
sudo, python3 packages
one user with ssh-key and sudo without password

Master Kamailio Node

k1.0x300.de - alpine eth0 dhcp, eth1 10.10.10.1 / netmask 255.255.255.0 no gateway

Slave Kamailio Node

k2.0x300.de - alpine eth0 dhcp, eth1 10.10.10.2 / netmask 255.255.255.0 no gateway

Controller / DB-Host

strg.0x300.de - alpine (controller) (optional) eth0 dhcp, eth1 10.10.10.253 / netmask 255.255.255.0