Manage Xvfb (Virtual Framebuffer X Server) as a service for systemd based distros (CentOS 7, Ubuntu 15...)

[Unit] Description=Virtual Frame Buffer X Server After=network.target

[Service] ExecStart=/usr/bin/Xvfb :42 -screen 0 1x1x24 -ac +extension GLX +render -noreset

[Install] WantedBy=multi-user.target