The Yum of Linux software Management

1. Yum Concept:

Package Manager Front-end tool: Yum (Yellowdog Update Modifier)

Yum: can automatically resolve dependencies, which solves the problem that the RPM Package Manager cannot resolve dependencies.

2. Yum's Repository (warehouse):

A, each RPM package

B, dependencies, package installation can generate file list and other metadata files.

3. Yum Client:

A, through the configuration file, specify a available yum warehouse.

B, cache the data, Yum will fetch the data to an available Yum repository and cache it locally.

such as: [Sohu_fedora_server]

Name=fedora Server CentOS 6.4

baseurl=http://mirrors.sohu.com/fedora-epel/6server/x86_64/

Enabled=1

Gpgcheck=0

4. Yum Warehouse configuration:/etc/yum.conf/etc/yum.repos.d/*.repo

A, this configuration file has two segments: [Main]: Main configuration segment and [Repo]: Warehouse configuration segment

B, configuration repo:

[REPO_ID]

Name=string

Access path to the Baseurl= warehouse

ENABLED={1|0} whether to enable its warehouse, enabled by default

GPGCHECK={1|0} Check package source legitimacy and integrity, enabled by default

gpgkey= Public key file, when gpgcheck=1 is valid; You can specify a local key, or you can specify a server path

Cost= defines the cost of this warehouse, defaults to 1000, specifies priority, and small priority.

Such as:

[Base_local]

name=centos6.4 x86_64 Release ISO file

baseurl=file:///media/mirros/

Enabled=1

Gpgcheck=1

Gpgkey=file:///media/mirros/rpm-gpg-key-centos-6

Note that in addition, the following two fedora sources are available, and the RPM packages required for CentOS can be found.

[Sohu_fedora_server]

Name=fedora Server CentOS 6.4

baseurl=http://mirrors.sohu.com/fedora-epel/6server/x86_64/

Enabled=1

Gpgcheck=0

[Sohu_fedora_client]

Name=fedora Client CentOS 6.4

baseurl=http://mirrors.sohu.com/fedora-epel/6/x86_64/

Enabled=1

Gpgcheck=0

5, #uname-A: View all information for the current system version.

6. Yum [Options] COMMAND:

Options

-Y: Direct execution without confirmation. #yum-y intall zsh, install zsh package directly

COMMAND:

Install package_name ...: installs the specified package.

Erase package_name: Uninstalls the specified package, and note that packages that depend on this package are unloaded.

Repolist [all|enabled|disabled]: All available configurations are displayed by default Yum repo

Clean [All|packages|metadata|expire-cache|rpmdb|plugins]: empties the cached data.

list [all, including installed and installable, default to all|installed installed |available installable]: Show all RPM packages

Info package_name: Displays the RPM package information. such as #rpm info zsh

Reintall package_name ... : Reinstall the specified package.

Check-update: Check for upgradeable packages.

Update package_name ...: Upgrade the specified package.

Note: Now the version is x-1.2.1, but later version x-1.2.2 and x-1.2.3, just want to update to x-1.2.2 how to deal with?

To upgrade to the specified version #yum update x-1.2.2

Downgrade Package_name: Downgrade.

Provides/path/to/some_file: Query which installation package was generated for a file: #yum provides/etc/passwd

Grouplist: Lists all the package groups,

GroupInfo "Package_group_name": Displays package group information.

Three development-related package groups:

Desktop Platform Development

Server Platform Development

Development Tools

Groupinstall "Group_name": Installs the specified package group. #yum-y Groupinstall "Desktop Platform Development"

Groupremove "group_name": Uninstalls the specified package group. #yum groupremove "Desktop Platform Development"

Install the local pack with Yum: (Manually disable check source and integrity:--nogpgcheck)

such as #yum--nogpgcheck install/tmp/zsh-2.3.1-2-el6.x86_64.rpm

The Yum of Linux software Management