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Installing Using VNC
The graphical installation interface is the recommended method of installing {PRODUCT}. However, in some cases, accessing the graphical interface directly is difficult or impossible. Some systems lack the capability to connect a display and a keyboard, making VNC a necessity for manual (non-Kickstart) installations.
To allow manual installations on _headless systems_ (systems without a directly connected display, keyboard and mouse), the [application]*Anaconda* installation program includes a _Virtual Network Computing_ (VNC) mode which allows the graphical mode of the installation program to run locally, but display on another system connected to the network. The VNC installation provides you with the full range of installation options.
This chapter provides instructions on activating VNC mode on the installation system and connecting to it using a VNC viewer.
Installing a VNC Viewer
Performing a VNC installation requires a VNC viewer running on your workstation or another terminal computer. VNC viewers are available in the repositories of most Linux distributions; free VNC viewers are also available for other operating systems such as Windows. On Linux systems, use your package manager to search for a viewer for your distribution.
The following VNC viewers are available in {PRODUCT}:
[application]*TigerVNC* - A basic viewer independent of your desktop environment. Installed as the [package]*tigervnc* package.
[application]*Vinagre* - A viewer for the [application]*GNOME* desktop environment. Installed as the [package]*vinagre* package.
[application]*KRDC* - A viewer integrated with the [application]*KDE* desktop environment. Installed as the [package]*kdenetwork-krdc* package.
To install any of the viewers listed above, execute the following command as `root`:
# dnf install package
Replace _package_ with the package name of the viewer you want to use (for example, [package]*tigervnc*).
Procedures in this chapter assume you are using [application]*TigerVNC* as your VNC viewer. Specific instructions for other viewers may differ, but the general principles still apply.
Performing a VNC Installation
The [application]*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, [application]*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, [application]*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.