A simple HTTP-service systemd example

http-repository.ini

[Unit]
Description=Enable HTTP access to the repository
After=syslog.target network.target

[Service]
Type=simple
# Execute ExecStartPre and ExecStopPost directives from superuser
PermissionsStartOnly=true
User=ftp
Group=ftp
WorkingDirectory=/var/ftp/pub
# Setup redirection from port 80 to port 8000
ExecStartPre=/sbin/iptables -t nat -A PREROUTING -p tcp --dport 80 -j REDIRECT --to-ports 8000
ExecStart=/usr/bin/python -m SimpleHTTPServer 8000
# Cleanup redirection listed above
ExecStopPost=/sbin/iptables -t nat -D PREROUTING -p tcp --dport 80 -j REDIRECT --to-ports 8000