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At the bottom of the Xvfb man(1) page, we see:
You may need to install the xorg-x11-apps RPM package.
Xvfb -pixdepths 3 27 -fbdir /var/tmp The server will listen for connections as server number 0, will have the default screen configuration (one screen, 1280x1024x8), will also support pixmap depths of 3 and 27, and will use memory mapped files in /var/tmp for the framebuffer. xwud -in /var/tmp/Xvfb_screen0 Displays screen 0 of the server started by the preceding example.