Building YUM Library and using YUM tools

YUM,Yellow dog Updater Modified

Software update mechanism based on RPM package construction

Automatically resolve package dependencies

All software packages are provided by a centralized YUM software repository

Basic configuration file for yum:

Basic setting: / etc/yum.conf

Warehouse configuration: / etc/yum.repos.d/*.repo

Log file: / var/log/yum.log

Cache directory: / var/cache/yum/$basearch/$releasever [used to store download packages, warehouse records, etc.]

*. Basic configuration items for repo:

[source name]: custom name, unique

Name: description information of this software source

Baseurl: specify the URL address of the YUM server [local directory file://..., FTP or HTTP service: ftp://..., http://...]

Enabled: whether to enable this configuration

Gpgcheck: whether to verify the RPM package to be installed

Gpgkey: key file for RPM authentication

Basic operation of the software package:

Format: yum [- y] instruction [software name]. # [- y] omit confirmation during installation or deletion

Common instructions:

List: view a list of packages

Search: view key keywords for package name or description

Info: view the description of the package, similar to rpm-qi

Install: installs the specified software package, similar to rpm-I

Update: upgrading specified software packages

Remove: uninstalls the specified package, similar to rpm-e

Provides: similar to rpm-qf

Clean all: clear all caches of the local yum

Basic operation of software group:

Format: yum [- y] instruction [package group name]. # [- y] omit confirmation during installation or deletion

Common instructions:

Grouplist: view a list of software groups

Groupinfo: view the description of the software group

Groupinstall: installs the specified software group

Groupupdate: upgrade software group

Groupremove: uninstall the software group