Installing and configuring the X Windows Virtual Frame Buffer (Xvfb)

You install X Windows Virtual Frame Buffer (Xvfb) to enable graphs in Empirica Signal.

Prerequisites:

• Yum is installed.
• Yum is configured to use the appropriate configuration file.
• Your system can connect to the yum repositories.

Perform these steps using the privileged user account on the application server.

1. Determine whether Xvfb is installed:
   1. Execute the following command in a command shell:

      $ which Xvfb

      If a path to Xvfb appears, Xvfb is already installed. Alternatively, Xvfb is not installed.

   2. If Xvfb is already installed, skip to step 3.
2. Install Xvfb:
   1. Type the following command to initiate the installation:

      $ sudo yum install Xvfb

      A password prompt might appear.

   2. If a password prompt appears, type the password for the privileged user account on the application server.

      A confirmation prompt appears.

   3. Type Y, and press Enter.
3. Execute the following cp and chkconfig -add commands to enable Xvfb:

   $ sudo su - root

   # cp <INSTALL_DIR>/service/xvfb /etc/rc.d/init.d

   # /sbin/chkconfig --add xvfb

   where <INSTALL_DIR> is the Empirica Signal installation directory. For more information, see Unpacking the installation files into the installation directory.

4. Execute the chkconfig --list command to verify that the installation was successful, for example:

   # /sbin/chkconfig --list xvfb

   The following response appears:

   xvfb 0:off 1:off 2:off 3:on 4:off 5:on 6:off

5. Execute the start command to start Xvfb, for example:

   # /etc/rc.d/init.d/xvfb start

   The following response appears:

   Starting X Virtual Frame Buffer

6. Type exit to terminate your session as the root user.

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