Repositories configuration

Most of servers may use same repositories set:

deb http://ftp.us.debian.org/debian/ buster main contrib non-free
deb http://ftp.us.debian.org/debian/ buster-updates main
deb http://security.debian.org/ buster/updates main
deb http://pkg.yeti-switch.org/debian/buster 1.11 main
deb http://apt.postgresql.org/pub/repos/apt/ buster-pgdg main

System repositories can be changed by editing of file: /etc/apt/sources.list. Since we use our own package repository you have add our key to trusted.

# wget http://pkg.yeti-switch.org/key.gpg -O - | apt-key add -

PGDG repository key also should be added to trusted list

# wget https://www.postgresql.org/media/keys/ACCC4CF8.asc -O - | apt-key add -