Using the Red Hat Package Manager
The install mode, as its name suggests, is used to install RPM packages onto your system. Installing a package is accomplished with the -i option:
# rpm -i penguin-3.26.i386.rpm
Before installing the package, RPM performs several checks. First, it makes sure the package you are trying to install isn't already installed. RPM won't let you install a package on top of itself. It also checks that you are not installing an older version of the package. Next, RPM does a dependency check. Some packages depend on other packages being installed first. In this example, you have just downloaded the latest RPM version of Penguin utilities and now want to install it.
# rpm -i penguin-3.26.i386.rpm failed dependencies: iceberg >= 7.1 is needed by penguin-3.26.i386.rpmThis error indicates the penguin package failed to install because it requires the iceberg package with a version equal to or greater than 7.1. You'll have to find and install the iceberg package, and any packages iceberg requires.
Finally, RPM checks to see if any configuration files would be overwritten by the installation of this package. RPM tries to make intelligent decisions about what to do with conflicts. If RPM replaces an existing configuration file with one from the new package, a warning will be printed to the screen.
# rpm -I penguin-3.26.i386.rpm warning: /etc/someconfig saved as /etc/someconfig.rpmsave
It's up to you to look at both files and determine what modifications, if any, need to be made.
The -u switch is used to upgrade existing packages. For example, if Penguin Utilities version 3.25 is already installed, issuing the command
# rpm -u penguin-3.26.i386.rpm
will replace the old version of the package with the new one. In fact, one of the quirks of RPM's upgrade mode is that the older package doesn't have to exist in the first place: -u works identically to -i in this case.
The rpm -e command removes a package from your system. Like Install mode, RPM does some housekeeping before it will let you remove a package. First, it does a dependency check to make sure no other packages depend on the package you are removing. If you have modified any of the configuration files, RPM makes a copy of the file, appends .rpmsave onto the end of it, then erases the original. Finally, after removing all files from your system and the RPM database, it removes the package name from the database.
Be very careful about which packages you remove from your system. Like most Linux utilities, RPM assumes omniscience and will silently let you shoot yourself in the foot. Removing the passwd or kernel package would be devastating.
This has been a basic introduction to the idea of packages and basic package management. You should now have a fairly good idea of how to query, install, upgrade and remove packages from your Linux system.
Kirk Rafferty has been a UNIX System Administrator for twelve years and has been using and maintaining Linux systems for the last five. His hobbies include paintball, gaming and making the best home brew in Colorado. He can be reached for comment at firstname.lastname@example.org.
|Updates from LinuxCon and ContainerCon, Toronto, August 2016||Aug 23, 2016|
|NVMe over Fabrics Support Coming to the Linux 4.8 Kernel||Aug 22, 2016|
|What I Wish I’d Known When I Was an Embedded Linux Newbie||Aug 18, 2016|
|Pandas||Aug 17, 2016|
|Juniper Systems' Geode||Aug 16, 2016|
|Analyzing Data||Aug 15, 2016|
- Updates from LinuxCon and ContainerCon, Toronto, August 2016
- NVMe over Fabrics Support Coming to the Linux 4.8 Kernel
- What I Wish I’d Known When I Was an Embedded Linux Newbie
- New Version of GParted
- All about printf
- Analyzing Data
- Tor 0.2.8.6 Is Released
- Blender for Visual Effects
- Juniper Systems' Geode
With all the industry talk about the benefits of Linux on Power and all the performance advantages offered by its open architecture, you may be considering a move in that direction. If you are thinking about analytics, big data and cloud computing, you would be right to evaluate Power. The idea of using commodity x86 hardware and replacing it every three years is an outdated cost model. It doesn’t consider the total cost of ownership, and it doesn’t consider the advantage of real processing power, high-availability and multithreading like a demon.
This ebook takes a look at some of the practical applications of the Linux on Power platform and ways you might bring all the performance power of this open architecture to bear for your organization. There are no smoke and mirrors here—just hard, cold, empirical evidence provided by independent sources. I also consider some innovative ways Linux on Power will be used in the future.Get the Guide