Introduction, configuration, and usage of yum in CentOS

Introduction, configuration, and usage of yum in CentOS
1. What is yum [html] view plaincopyprint?

1. Yum = YellowdogUpdater, Modified

The main function is to conveniently Add/delete/update RPM packages.
It automatically solves the dependency problem of the package.
It facilitates management of a large number of system update Problems
Note: The simplest reason for using yum instead of apt is that ora comes

Ii. yum features * multiple resource libraries can be configured simultaneously (Repository)
* Simple configuration file (/etc/yum. conf)
* Automatically solves the dependency problem when rpm packages are added or deleted.
* Easy to use
* Maintain consistency with the RPM Database

Iii. How does yum install Fedora's built-in [plain] view plaincopyprint?

1. # Rpm-ivhyum-2.0.4-2.noarch.rpm

Iv. yum configuration Note: Modify and add the resource library in the configuration file to accelerate the download speed and have more updatable rpm packages
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1. [Main]
2. Cachedir =/var/cache/yum
3. Debuglevel = 2
4. Logfile =/var/log/yum. log
5. Pkgpolicy = newest
6. Distroverpkg = fedora-release
7. Tolerant = 1
8. Exactarch = 1
10. [Fedora-us-1]
11. Name = FedoraCore1 -- FedoraUSmirror
12. Base url = ftp://mirrors.kernel.org/fedora.us/fedora/fedora/1/i386/yum/ OS
14. [Fedora-us-1-updates]
15. Name = FedoraCore1updates -- FedoraUSmirror
16. Base url = ftp://mirrors.kernel.org/fedora.us/fedora/fedora/1/i386/yum/updates
18. [Fedora-us-1-stable]
19. Name = FedoraLinux (stable) forFedoraCore1 -- FedoraUSmirror
20. Base url = ftp://mirrors.kernel.org/fedora.us/fedora/fedora/1/i386/yum/stable
22. [Freshrpms]
23. Name = FedoraLinux $ releasever-$ basearch-freshrpms
24. Baseurl = http://ayo.freshrpms.net/fedora/linux/?releasever/?basearch/freshrpms

5. yum application note: when you use the yum or yum resource library for updates for the first time, yum automatically downloads all required headers and stores them in the/var/cache/yum Directory, which may take a long time.

Check which update rpm packages are available
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1. # Yumcheck-update

Install the rpm package so that xmms can play mp3
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1. # Yuminstallxmms-m

Delete the licq package and delete the packages that are dependent on the package.
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1. # Yumremovelicq

Note: You will also be prompted to delete licq-gnome, licq-qt, and licq-text, which is very convenient.

System update (update all rpm packages that can be upgraded, including kernel)
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1. # Yum-yupdate

Periodically update the system every day. [html] view plaincopyprint?

1. # Chkconfigyumon
2. # Serviceyumstart

6. yum instructions * update the rpm package
Check the updatable rpm package
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1. # Yumcheck-update

Update all rpm packages
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1. # Yumupdate

Update the specified rpm package, such as updating the kernel and kernel source
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1. # Yumupdatekernelkernel-source

For large-scale version upgrades, unlike yum update, the old obsolete package is also upgraded.
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1. # Yumupgrade

* Installation and removal of rpm packages, such as xmms-mp3
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1. # Yuminstallxmms-mp3

Delete an rpm package, including packages that depend on the package
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1. # Yumremovelicq

Note: You will also be prompted to delete licq-gnome, licq-qt, and licq-text.


* Yum temporary storage (/var/cache/yum/) related parameters clear temporary rpm package files
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1. # Yumcleanpackages

Clear temporary rpm header files
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1. # Yumcleanheaders

Clear the existing rpm header file
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1. # Yumcleanoldheaders

Clear existing rpm header files and package files
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1. # Yumclean or # yumcleanall

Note: equivalent to yumcleanpackages + yumcleanoldheaders
* The rpm package list lists all the rpm packages that can be installed or updated in the resource library.
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1. # Yumlist

List specific rpm packages that can be installed, updated, and installed in the resource library
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1. # Yumlistmozilla

Note: Match characters can be used in rpm package names, for example, to list all rpm packages starting with mozilla

List all updates to the rpm package in the resource library
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1. # Yumlistupdates

List all installed rpm packages
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1. # Yumlistinstalled

List rpm packages installed but not included in the resource library
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1. # Yumlistextras

Note: download and install the rpm package from other websites


* Rpm package information display (the info parameter is the same as the list)
Lists information about all rpm packages that can be installed or updated in the resource library.
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1. # Yuminfo

Lists the specific information about which rpm packages can be installed or updated and installed in the resource library. [html] view plaincopyprint?

1. # Yuminfomozilla

Note: Match characters can be used in rpm package names, such as listing all rpm packages starting with mozilla

Lists information about all the rpm packages that can be updated in the resource library.
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1. # Yuminfoupdates

Lists information about all installed rpm packages.
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1. # Yuminfoinstalled

Lists the installed rpm packages that are not included in the resource library.
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1. # Yuminfoextras

Note: Download the installed rpm package information from other websites.


* Search for rpm packages matching specific characters
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1. # Yumsearchmozilla

Note: Search for rpm package names and package descriptions

Search for rpm packages with specific file names
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1. # Yumprovidesrealplay

7. Install the GPG key of freshrpms.net In the rpm package of freshrpms.net.
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1. # Rpm -- importhttp: // freshrpms.net/packages/RPM-GPG-KEY.txt

Edit/etc/yum. conf and add the following information to the end of [html] view plaincopyprint?

1. [Freshrpms]
2. Name = FedoraLinux $ releasever-$ basearch-freshrpms
3. Baseurl = http://ayo.freshrpms.net/fedora/linux/?releasever/?basearch/freshrpms
4. Gpgcheck = 1

Note:
Check GPG Key # rpm-qagpg-pubkey * display Key information # rpm-qigpg-pubkey-e42d547b-3960bdf1 delete Key # rpm-egpg-pubkey-e42d547b-3960bdf1