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10 Start the service by entering /usr/local/sbin/pure-ftpd & at the shell prompt 11 Test the system by entering ftp localhost at the shell prompt 12 When prompted, enter a username of anonymous You should be logged in to the FTP server at this point 13 Close the connection by entering quit At this point, you have a functioning FTP server running on your Linux system! However, it won t be accessible by other workstations yet because your system s host firewall is probably blocking traffic on the IP ports used by the FTP protocol We ll address how to open up ports in 15 In addition to installing software from source code, you can also install programs using preconfigured packages Let s discuss how this is done next
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In addition to installing software from source code, you can also install precompiled, preconfigured applications and services on your Linux system using packaged software With packaged software, the source code is prebuilt and configured for a particular system architecture and, in some cases, a specific Linux distribution In this part of this chapter, we re going to discuss the following:
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The role and function of a package manager Installing RPM packages
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Let s start by discussing the package manager
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The Role and Function of a Package Manager
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To use software packages, you must have some type of software package manager installed On distributions such as SUSE, Red Hat, and Fedora (as well as many others), you use the Red Hat Package Manager (RPM) to manage RPM packages on your Linux system Other distributions may use a different package manager For example, the Debian For your Linux+ exam, distribution has its own package management you need to know the Red Hat Package system that is similar to the RPM system Manager
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8: Installing and Managing Software on Linux
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Regardless of which one you use, the role of a package manager is to do the following:
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Install new packages Update existing packages Verify package files Query installed packages Uninstall packages
To make this happen, the RPM Package Manager has its own database, stored in /var/lib/rpm, that it uses to keep track of what packages are installed in the system Whenever you install, uninstall, or update a package, the appropriate changes are made to this database On rare occasions, the rpm database can get corruptedThis can cause numerous headaches with the packages installed on the system You can use the rpm - -rebuilddb command from the shell prompt to try to restore the database to a functioning state Let s next discuss how you use the RPM Package Manager to install package files
Installing RPM Packages
The great thing about RPM is the fact that it makes it much easier to install and manage software than the source code option we discussed earlier in this chapter, especially for new or novice Linux users Frankly, you have to know your stuff with Linux to install and compile source code You re likely to find that the skills and knowledge required is way beyond that of most of your end users RPM packages, on the other hand, are quite easy to install Instead of having to download and extract a tarball file, most RPM packages are downloaded in a single file that you process directly You don t have to untar, configure, make, and make install the file the way you do with source code installs Instead, you simply use the rpm utility to install a package file Before I show you how to do this, we first need to discuss the naming conventions used by RPM packages This is very important because RPM packages are built for a specific CPU architecture and sometimes even for a specific Linux distribution Unlike source code installs, which customize the program for the particular architecture during the installation process, RPM packages come precompiled for a specific architecture That means there may be multiple versions of a particular RPM available to accommodate different platforms
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