mailinabox/scripts/system.sh

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# Base system configuration.
apt-get -q -q update
apt-get -q -y upgrade
# Turn on basic services:
#
# ntp: keeps the system time correct
#
# fail2ban: scans log files for repeated failed login attempts and blocks the remote IP at the firewall
#
# These services don't need further configuration and are started immediately after installation.
apt-get install -q -y ntp fail2ban
# Turn on the firewall. First allow incoming SSH, then turn on the firewall. Additional open
# ports will be set up in the scripts that set up those services.
if [ -z "$DISABLE_FIREWALL" ]; then
ufw allow ssh;
ufw --force enable;
fi