The Stack Builder utility provides a graphical interface that simplifies the process of downloading and installing modules that complement your PostgreSQL installation. When you install a module with Stack Builder, Stack Builder automatically resolves any software dependencies.Stack Builder requires Internet access; if your installation of PostgreSQL resides behind a firewall (with restricted Internet access), Stack Builder can download program installers through a proxy server. The module provider determines if the module can be accessed through an HTTP proxy or an FTP proxy; currently, all updates are transferred via an HTTP proxy and the FTP proxy information is not used.You can invoke Stack Builder at any time after the installation has completed by selecting the Application Stack Builder menu option from the PostgreSQL 9.5 menu. Enter your system password (if prompted), and the Stack Builder welcome window opens (shown in Figure 4.1).If the selected PostgreSQL installation has restricted Internet access, use the Proxy Servers button on the Welcome window to open the Proxy servers dialog (shown in Figure 4.2).Enter the IP address and port number of the proxy server in the HTTP proxy or FTP proxy fields on the Proxy servers dialog. Currently, all Stack Builder modules are distributed via HTTP proxy (FTP proxy information is ignored). Click OK to continue.The tree control on the Stack Builder module selection window (shown in Figure 4.3) contains a node for each module category; click on a category heading to expose the modules within that category (as shown in Figure 4.4).Each entry within the tree control is the name of a module that can be installed with Stack Builder.
• If the module is installed, you will see the word (installed) to the right of the module name.
• If a module name is in bold type, the installer has detected a mismatch between the available version and the installed version.
• To add new modules to the selected PostgreSQL installation, check the box to the left of the module name and click Next.The Selected packages window confirms the packages selected (Figure 4.5).The package installers are downloaded to the directory specified in the Download directory field. Use the button to the right of the Download directory field to open a file selector, and choose an alternate location in which to store the downloaded installers.Click Next to connect to the server and download the required installation files. (see Figure 4.6).When the downloads complete, a window opens confirming that the installation files have been downloaded and are ready for installation (see Figure 4.7).You can check the box next to Skip Installation, and select Next to exit Stack Builder without installing the downloaded files, or leave the box unchecked and click Next to start the installation process.Each downloaded installer has different requirements. As the installers execute, they may prompt you to confirm acceptance of license agreements, to enter passwords, and enter configuration information.During the installation process, you may be prompted by one (or more) of the installers to restart your system. Select No or Restart Later until all installations are completed. When the last installation has completed, re-boot the system to apply all of the updates.You may occasionally encounter packages that don’t install successfully. If a package fails to install, Stack Builder will alert you to the installation error with a popup dialog, and write a message to the log file in a platform-specific location:On Windows: %TEMP%On Linux: /tmpWhen the installation is complete, Stack Builder will alert you to the success or failure of the installations of the requested packages (see Figure 4.8). If you were prompted by an installer to restart your computer, re-boot now.