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11.2. Performing a VNC Installation

The Anaconda installation program offers two modes for VNC installation: Direct mode and Connect mode. The modes differ in the way the connection between the server and viewer is established. After you successfully connect, the installation will progress the same way regardless of the mode you used.
Direct Mode
In this mode, Anaconda is configured to start the installation and wait for an incoming connection from VNC viewer before proceeding. While waiting for an incoming connection, the system's IP address and the port on which the installer expects the connection is displayed on the display or console if available; this implies that you need at least a serial console to connect using this mode, but you can work around this limitation if you know the default VNC port and the system's IP address.
Connect Mode
In this mode, the VNC viewer is started on the remote system in listening mode. The VNC viewer waits for an incoming connection on a specified port. Then, Anaconda is started and the host name/IP address and port number of the viewer are provided using a boot option or a Kickstart command. When the installation begins, the installation program establishes a connection with the listening VNC viewer using the specified host name/IP address and port number. Connect mode is therefore easier to use on systems with no local display or console, but it also may require additional preparation, because the viewer system must be able to accept incoming connections on the specified port, which usually requires changing firewall settings.

11.2.1. Choosing a VNC Installation Mode

  • Visual and Interactive access to the system
    • If visual and interactive access to the system being installed is not available, then you should use Connect Mode.
  • Network Connection Rules and Firewalls
    • If the system being installed is not allowed inbound connections by a firewall, then you must use Connect Mode or disable the firewall. Disabling a firewall may have security implications.
    • If the remote system running the VNC viewer is not allowed incoming connections by a firewall, then you must use Direct Mode, or disable the firewall. Disabling a firewall may have security implications.