Linux下程序包管理之YUM

Linux下程序包管理之YUM

实验环境：

CentOS release 6.6 (Final) 一台

IP地址：172.16.249.230

附带：CentOS release 6.6光盘镜像文件

CentOS-6.6-x86_64-bin-DVD1.iso

CentOS-6.6-x86_64-bin-DVD2.iso

 

 

YUM(Yellow dog Updater, Modified) 由Duke University团队，修改Yellow Dog Linux的Yellow Dog Updater开发而成，

是一个基于 RPM 包管理的字符前端软件包管理器。能够从指定的服务器自动下载 RPM 包并且安装，可以处理依赖性关系，并且一次安装所有依赖的软件包，无须繁琐地一次次下载、安装。被Yellow Dog Linux本身，以及Fedora、Red Hat Enterprise Linux、CentOS、SUSE采用。

 

一.YUM仓库和客户端简介

YUM repository：yum仓库

存储了众多rpm包，以及包的相关元数据的文件服务器

文件服务器：

HTTP：http://ip/centos/$releasever/os/$basearch/

FTP：ftp://ip/centos/$releasever/os/$basearch/

NFS：网络文件系统，nfs://ip/centos/$releasever/os/$basearch/

FILE：本地，file:///centos/$releasever/os/$basearch/

YUM Client ：客户端

配置文件：指向仓库的位置以及各种配置信息，每个yum客户端可以有多个仓库。

缓存文件：/var/cache/yum/

 

 

二.YUM的配置文件详解

yum的配置一般有两种方式，一种是直接配置/etc目录下的yum.conf文件，另外一种是在/etc/yum.repos.d目录下增加.repo文件。

 

（一）.关于yum.conf文件详解

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#cat /etc/yum.conf [main] cachedir=/var/cache/yum/$basearch/$releasever #yum下载的RPM包的缓存目录 keepcache=0 #缓存是否保存，1保存，0不保存。 debuglevel=2 #调试级别(0-10)，默认为2(具体调试级别的应用，我也不了解)。 logfile=/var/log/yum.log #yum的日志文件所在的位置 exactarch=1 #在更新的时候，是否允许更新不同版本的RPM包，比如是否在i386上更新i686的RPM包。 obsoletes=1 #这是一个update的参数，具体请参阅yum(8)，简单的说就是相当于upgrade，允许更新陈旧的RPM包。 gpgcheck=1 #是否检查GPG(GNU Private Guard)，一种密钥方式签名。 plugins=1 #是否允许使用插件，默认是0不允许，但是我们一般会用yum-fastestmirror这个插件。 installonly_limit=5 #允许保留多少个内核包。 bugtracker_url=http://bugs.centos.org/set_project.php?project_id=19&ref=http://bugs.centos.org/bug_report_page.php?category=yum distroverpkg=centos-release # This is the default, if you make this bigger yum won't see if the metadata # is newer on the remote and so you'll "gain" the bandwidth of not having to # download the new metadata and "pay" for it by yum not having correct # information. # It is esp. important, to have correct metadata, for distributions like # Fedora which don't keep old packages around. If you don't like this checking # interupting your command line usage, it's much better to have something # manually check the metadata once an hour (yum-updatesd will do this). # metadata_expire=90m # PUT YOUR REPOS HERE OR IN separate files named file.repo # in /etc/yum.repos.d

 

（二）.关于/etc/yum.repos.d/*.repo文件详解

 

什么是repo文件？

repo文件是CentOS中yum源（软件仓库）的配置文件，通常一个repo文件定义了一个或者多个软件仓库的细节内容，例如我们将从哪里下载需要安装或者升级的软件包，repo文件中的设置内容将被yum读取和应用！

我们以一份系统自带的repo文件做为实例来探讨（#号后面是我加的注释）：

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[base] name=CentOS-$releasever - Base #baseurl=http://mirror.centos.org/centos/$releasever/os/$basearch/ gpgcheck=1 gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-6

 

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[base] #方括号里面的是软件源的名称，将被yum取得并识别 name=CentOS-$releasever - Base #这里也定义了软件 仓库的名称，通常是为了方便阅读配置文件，一般没什么作用， $releasever变量定义了发行版本，通常是5，6，7等数字， 这个变量根据当前系统的版本架构不同而有不同的取值， 这可以方便yum升级的时候选择 适合当前系统的软件包，以下同…… #baseurl=http://mirror.centos.org/centos/$releasever/os/$basearch/ #上面的一行baseurl第一个字符是'#'表示该行已经被注释，将不会被读取， $basearch变量定义了系统的架构，可以是i386、x86_64、ppc等值 这一行的意思是指定一个baseurl（源的镜像服务器地址） enabled=1 #这个选项表示这个repo中定义的源是启用的，0为禁用 gpgcheck=1 # 这个选项表示这个repo中下载的rpm将进行gpg的校验，已确定rpm包的来源是有效和安全的 gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-6 #定义用于校验的gpg密钥

 

 

 

三.构建YUM仓库

 

简要步骤说明

（一）.确认文件共享方式

（二）.把rpm包放置于能够被各yum客户端访问到位置

（三）.创建yum仓库的元数据

createrepo命令

1	#yum -y install createrepo

为yum仓库创建元数据文件

1	#createrepo 软件包文件目录

 

实验案例：

在本文中我创建一个本地光盘yum来构建一个本地YUM仓库。

（一）、挂载本地光盘

1	#mkdir /mnt/cdrom

#新建挂载目录

1	#mount -t iso9660 /dev/cdrom /mnt/cdrom

#挂载光盘到/mnt/cdrom 目录

1	#ls /mnt/cdrom

#查看/mnt/cdrom 目录内容

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[root@LinuxHost yum.repos.d]# mkdir /mnt/cdrom [root@LinuxHost yum.repos.d]# mount -t iso9660 /dev/cdrom /mnt/cdrom mount: block device /dev/sr0 is write-protected, mounting read-only [root@LinuxHost yum.repos.d]# ls /mnt/cdrom CentOS_BuildTag isolinux RPM-GPG-KEY-CentOS-Debug-6 EFI Packages RPM-GPG-KEY-CentOS-Security-6 EULA RELEASE-NOTES-en-US.html RPM-GPG-KEY-CentOS-Testing-6 GPL repodata TRANS.TBL images RPM-GPG-KEY-CentOS-6

 

（二）、配置本地YUM源

1	#cd /etc/yum.repos.d/

#进入/etc/yum.repos.d 目录

1

#ls

#查看目录内容

1 2	#mv CentOS-Base.repo CentOS-Base.repo.bak #mv CentOS-Debuginfo.repo CentOS-Debuginfo.repo.bak

#重命名上面2个文件

1	#vi CentOS-Media.repo

#对CentOS-Media.repo 进行编辑

 

（三）、修改CentOS-Media.repo内容

[c6-media]

name=CentOS-$releaserver - Media

#自定义Yum源名称

baseurl=file:///mnt/cdrom/

#本地光盘挂载路径

gpgcheck=1

#检查GPG-KEY

enabled=1

#启用Yum源

gpgkey=file:///mnt/cdrom/RPM-GPG-KEY-CentOS-6

#GPG-KEY路径

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[root@LinuxHost yum.repos.d]# cat CentOS-Media.repo [C6-Media] name=CentOS-$releaserver-Media baseurl=file:///mnt/cdrom gpcheck=1 enabled=1 gpgkey=file:///mnt/cdrom/RPM-GPG-KEY-CentOS-6

检查列出可用yum仓库元数据

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[root@LinuxHost yum.repos.d]# yum repolist Loaded plugins: fastestmirror, refresh-packagekit, security Loading mirror speeds from cached hostfile repo id repo name status C6-Media CentOS-$releaserver-Media 6,518 repolist: 6,518

 

至此，本地YUM源配置完成，我们就可以使用yum命令来安装管理程序包了。

 

 

四.YUM命令的使用

 

语法： yum [options] [command] [package ...]

其中的[options]是可选的，选项包括-h（帮助），-y（当安装过程提示选择全部为"yes"），-q（不显示安装的过程）等等。[command]为所要进行的操作，[package ...]是操作的对象

 

1 程序包管理：安装，更新，卸载，查看信息

1 2	直接安装包（可指定版本号） yum install packages -y

 

 

列出所有程序包（本地已安装和仓库中的程序包）

1

yum list

 

实例:

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[root@LinuxHost yum.repos.d]# yum list |more Loaded plugins: fastestmirror, refresh-packagekit, security Determining fastest mirrors Installed Packages ConsoleKit.x86_64 0.4.1-3.el6 @anaconda-Cen tOS-201410241409.x86_64/6.6 ConsoleKit-libs.x86_64 0.4.1-3.el6 @anaconda-Cen tOS-201410241409.x86_64/6.6 ConsoleKit-x11.x86_64 0.4.1-3.el6 @anaconda-Cen tOS-201410241409.x86_64/6.6 DeviceKit-power.x86_64 014-3.el6 @anaconda-Cen tOS-201410241409.x86_64/6.6 GConf2.x86_64 2.28.0-6.el6 @anaconda-Cen tOS-201410241409.x86_64/6.6

列出可用yum仓库元数据

 

1	yum repolist

 

实例:

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[root@LinuxHost yum.repos.d]# yum repolist Loaded plugins: fastestmirror, refresh-packagekit, security Loading mirror speeds from cached hostfile repo id repo name status C6-Media CentOS-$releaserver-Media 6,518 repolist: 6,518

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--disablerepo=name repolist禁用某个仓库，优先级高于配置文件定义的 --enablerepo=name repolist启用某个仓库，优先级高于配置文件定义的 yum list {all|installed|available}显示选项后可以使用globbing通配符

 

清除本地所有缓存

 

1	yum clean all

headers, packages, metadata, dbcache, plugins, expire-cache, rpmdb, all

清除缓存的选项

实例:

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[root@LinuxHost yum.repos.d]# yum clean all Loaded plugins: fastestmirror, refresh-packagekit, security Cleaning repos: C6-Media Cleaning up Everything Cleaning up list of fastest mirrors

 

手动生成yum缓存，有些慢就不帖了。

1	yum makecache

 

升级安装包（可指定版本号），没更新的包了！就不升级了！

1	yum update packages

 

降级安装包，

1	yum downgrade packages

我先升级zsh到zsh-4.3.10-8.el6_5.x86_64.rpm，然后执行降级。

实例:

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[root@LinuxHost dvd]# rpm -Uvh zsh-4.3.10-8.el6_5.x86_64.rpm Preparing... ########################################### [100%] 1:zsh ########################################### [100%] [root@LinuxHost dvd]# yum downgrade zsh Loaded plugins: fastestmirror, refresh-packagekit, security Setting up Downgrade Process Loading mirror speeds from cached hostfile Resolving Dependencies --> Running transaction check ---> Package zsh.x86_64 0:4.3.10-7.el6 will be a downgrade ---> Package zsh.x86_64 0:4.3.10-8.el6_5 will be erased --> Finished Dependency Resolution Dependencies Resolved ======================================================================================== Package Arch Version Repository Size ======================================================================================== Downgrading: zsh x86_64 4.3.10-7.el6 C6-Media 2.1 M Transaction Summary ======================================================================================== Downgrade 1 Package(s) Total download size: 2.1 M Is this ok [y/N]: y Downloading Packages: Running rpm_check_debug Running Transaction Test Transaction Test Succeeded Running Transaction Warning: RPMDB altered outside of yum. Installing : zsh-4.3.10-7.el6.x86_64 1/2 Cleanup : zsh-4.3.10-8.el6_5.x86_64 2/2 Verifying : zsh-4.3.10-7.el6.x86_64 1/2 Verifying : zsh-4.3.10-8.el6_5.x86_64 2/2 Removed: zsh.x86_64 0:4.3.10-8.el6_5 Installed: zsh.x86_64 0:4.3.10-7.el6 Complete! [root@LinuxHost dvd]# rpm -qa zsh zsh-4.3.10-7.el6.x86_64

降级成功！

 

卸载程序包（会一并卸载依赖包）

1	yum remove|erease packages

 

实例:

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[root@LinuxHost dvd]# yum remove zsh Loaded plugins: fastestmirror, refresh-packagekit, security Setting up Remove Process Resolving Dependencies --> Running transaction check ---> Package zsh.x86_64 0:4.3.10-7.el6 will be erased --> Finished Dependency Resolution Dependencies Resolved ======================================================================================== Package Arch Version Repository Size ======================================================================================== Removing: zsh x86_64 4.3.10-7.el6 @C6-Media 4.8 M Transaction Summary ======================================================================================== Remove 1 Package(s) Installed size: 4.8 M Is this ok [y/N]: y Downloading Packages: Running rpm_check_debug Running Transaction Test Transaction Test Succeeded Running Transaction Erasing : zsh-4.3.10-7.el6.x86_64 1/1 Verifying : zsh-4.3.10-7.el6.x86_64 1/1 Removed: zsh.x86_64 0:4.3.10-7.el6 Complete! [root@LinuxHost dvd]# rpm -qa zsh

 

显示已安装或者未安装的指定包的信息（没有rpm -qi详细）

1	yum info packages

实例:

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[root@LinuxHost dvd]# yum info zsh Loaded plugins: fastestmirror, refresh-packagekit, security Loading mirror speeds from cached hostfile Available Packages Name : zsh Arch : x86_64 Version : 4.3.10 Release : 7.el6 Size : 2.1 M Repo : C6-Media Summary : A powerful interactive shell URL : http://zsh.sunsite.dk/ License : BSD Description : The zsh shell is a command interpreter usable as an interactive login : shell and as a shell script command processor. Zsh resembles the ksh : shell (the Korn shell), but includes many enhancements. Zsh supports : command line editing, built-in spelling correction, programmable : command completion, shell functions (with autoloading), a history : mechanism, and more.

 

根据关键字模糊查询包名或包的summary信息包含此KEYWORD的相关列表

1	yum search KEYWORD

实例:

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[root@LinuxHost dvd]# yum search zsh Loaded plugins: fastestmirror, refresh-packagekit, security Loading mirror speeds from cached hostfile =================================== N/S Matched: zsh =================================== python-twisted-core-zsh.x86_64 : Tab completion for Zsh and Twisted Core zsh-html.x86_64 : Zsh shell manual in html format zsh.x86_64 : A powerful interactive shell Name and summary matches only, use "search all" for everything.

 

查询文件谁提供了程序包安装的

1	yum provides|whatprovides /path/file

实例:

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[root@LinuxHost dvd]# yum provides /usr/bin/yum Loaded plugins: fastestmirror, refresh-packagekit, security Loading mirror speeds from cached hostfile yum-3.2.29-60.el6.centos.noarch : RPM package installer/updater/manager Repo : C6-Media Matched from: Filename : /usr/bin/yum yum-3.2.29-60.el6.centos.noarch : RPM package installer/updater/manager Repo : installed Matched from: Other : Provides-match: /usr/bin/yum

 

2.程序包组管理 group

 

列出所有包组

1	yum grouplist

实例:

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[root@LinuxHost dvd]# yum grouplist |more Loaded plugins: fastestmirror, refresh-packagekit, security Setting up Group Process Loading mirror speeds from cached hostfile Installed Groups: Additional Development Base Console internet tools Desktop Development tools Dial-up Networking Support Directory Client E-mail server Fonts General Purpose Desktop Graphical Administration Tools Hardware monitoring utilities Input Methods Legacy UNIX compatibility Legacy X Window System compatibility NFS file server Network Infrastructure Server Network file system client Networking Tools Performance Tools Perl Support Security Tools System administration tools Web Server X Window System Installed Language Groups: --More--

 

显示某包组的信息(强制安装的包，默认安装包，可选包）

1	yum groupinfo “group_name"

实例:

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[root@LinuxHost dvd]# yum groupinfo "Development tools" |more Loaded plugins: fastestmirror, refresh-packagekit, security Setting up Group Process Loading mirror speeds from cached hostfile Group: Development tools Description: A basic development environment. Mandatory Packages: autoconf automake binutils bison flex gcc gcc-c++ gettext libtool make patch pkgconfig redhat-rpm-config rpm-build Default Packages: byacc cscope ctags cvs diffstat doxygen elfutils gcc-gfortran --More-- 信息太多省略

 

CentOS6/7都支持安装程序组的命令

1 2	yum groupinstall "group_name" yum install @group_name

实例:

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[root@LinuxHost dvd]# yum groupinstall "Server Platform Development" Loaded plugins: fastestmirror, refresh-packagekit, security Setting up Group Process Loading mirror speeds from cached hostfile Package zlib-devel-1.2.3-29.el6.x86_64 already installed and latest version Package glibc-devel-2.12-1.149.el6.x86_64 already installed and latest version Package libstdc++-devel-4.4.7-11.el6.x86_64 already installed and latest version Package ncurses-devel-5.7-3.20090208.el6.x86_64 already installed and latest version Package 1:dbus-devel-1.2.24-7.el6_3.x86_64 already installed and latest version Package db4-devel-4.7.25-18.el6_4.x86_64 already installed and latest version Resolving Dependencies --> Running transaction check ---> Package krb5-devel.x86_64 0:1.10.3-33.el6 will be installed 省略。。。。。。。

 

CentOS6/7都支持移除组的命令

1 2	yum groupremove "group_name" yum remove @group_name

实例:

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[root@LinuxHost dvd]# yum groupremove "Server Platform Development" Loaded plugins: fastestmirror, refresh-packagekit, security Setting up Group Process Loading mirror speeds from cached hostfile Resolving Dependencies --> Running transaction check ---> Package db4-devel.x86_64 0:4.7.25-18.el6_4 will be erased --> Processing Dependency: db4-devel for package: 4:perl-devel-5.10.1-136.el6.x86_64 ---> Package dbus-devel.x86_64 1:1.2.24-7.el6_3 will be erased ---> Package glibc-devel.x86_64 0:2.12-1.149.el6 will be erased --> Processing Dependency: glibc-devel >= 2.2.90-12 for package: gcc-4.4.7-11.el6.x86_64 ---> Package libstdc++-devel.x86_64 0:4.4.7-11.el6 will be erased --> Processing Dependency: libstdc++-devel = 4.4.7-11.el6 for package: gcc-c++-4.4.7-11.el6.x86_64 省略。。。。。。

 

直接升级程序包组

1	yum groupupdate "group_name"

实例:

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[root@LinuxHost dvd]# yum groupupdate "Server Platform Development" Loaded plugins: fastestmirror, refresh-packagekit, security Setting up Group Process Loading mirror speeds from cached hostfile Package zlib-devel-1.2.3-29.el6.x86_64 already installed and latest version Package glibc-devel-2.12-1.149.el6.x86_64 already installed and latest version Package libstdc++-devel-4.4.7-11.el6.x86_64 already installed and latest version Package ncurses-devel-5.7-3.20090208.el6.x86_64 already installed and latest version Package 1:dbus-devel-1.2.24-7.el6_3.x86_64 already installed and latest version Package db4-devel-4.7.25-18.el6_4.x86_64 already installed and latest version Resolving Dependencies --> Running transaction check ---> Package krb5-devel.x86_64 0:1.10.3-33.el6 will be installed --> Processing Dependency: libselinux-devel for package: krb5-devel-1.10.3-33.el6.x86_64 省略

 

 

3.其他程序管理命令

 

安装本地的rpm包文件，自动通过仓库解决依赖关系，还会检查包来源合法性和完整性

1	yum localinstall packages

实例:

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[root@LinuxHost dvd]# yum localinstall zsh-4.3.10-8.el6_5.x86_64.rpm Loaded plugins: fastestmirror, refresh-packagekit, security Setting up Local Package Process Examining zsh-4.3.10-8.el6_5.x86_64.rpm: zsh-4.3.10-8.el6_5.x86_64 Marking zsh-4.3.10-8.el6_5.x86_64.rpm to be installed Loading mirror speeds from cached hostfile Resolving Dependencies --> Running transaction check ---> Package zsh.x86_64 0:4.3.10-8.el6_5 will be installed --> Finished Dependency Resolution Dependencies Resolved ======================================================================================== Package Arch Version Repository Size ======================================================================================== Installing: zsh x86_64 4.3.10-8.el6_5 /zsh-4.3.10-8.el6_5.x86_64 4.8 M Transaction Summary ======================================================================================== Install 1 Package(s) Total size: 4.8 M Installed size: 4.8 M Is this ok [y/N]: 省略信息。。。。。。

 

本地安装忽略合法性和完整性

1	yum localinstall packages --nogpgcheck

 

检查可用升级

1	yum check-update

实例:

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[root@LinuxHost dvd]# yum check-update Loaded plugins: fastestmirror, refresh-packagekit, security Loading mirror speeds from cached hostfile

 

重装程序包

1	yum reinstall packages

 

列出程序包依赖关系的信息

1	yum deplist packages

实例:

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[root@LinuxHost dvd]# yum deplist python Loaded plugins: fastestmirror, refresh-packagekit, security Finding dependencies: Loading mirror speeds from cached hostfile package: python.x86_64 2.6.6-52.el6 dependency: python-libs(x86-64) = 2.6.6-52.el6 provider: python-libs.x86_64 2.6.6-52.el6 dependency: libutil.so.1()(64bit) provider: glibc.x86_64 2.12-1.149.el6 dependency: libdl.so.2()(64bit) provider: glibc.x86_64 2.12-1.149.el6 dependency: rtld(GNU_HASH) provider: glibc.x86_64 2.12-1.149.el6 provider: glibc.i686 2.12-1.149.el6 dependency: libm.so.6()(64bit) provider: glibc.x86_64 2.12-1.149.el6 dependency: libpython2.6.so.1.0()(64bit) provider: python-libs.x86_64 2.6.6-52.el6 dependency: libpthread.so.0()(64bit) provider: glibc.x86_64 2.12-1.149.el6 dependency: libc.so.6(GLIBC_2.2.5)(64bit) provider: glibc.x86_64 2.12-1.149.el6

 

yum此前执行的命令历史

1	yum history

实例:

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[root@LinuxHost dvd]# yum history Loaded plugins: fastestmirror, refresh-packagekit, security ID | Login user | Date and time | Action(s) | Altered ------------------------------------------------------------------------------- 19 | root <root> | 2014-11-26 02:51 | Erase | 1 18 | root <root> | 2014-11-26 02:49 | Downgrade | 1 < 17 | root <root> | 2014-11-25 07:08 | Install | 1 > 16 | root <root> | 2014-11-25 06:46 | Install | 3 15 | root <root> | 2014-11-25 04:02 | Install | 1 14 | root <root> | 2014-11-24 13:35 | Install | 3 13 | root <root> | 2014-11-24 13:14 | Install | 1 12 | root <root> | 2014-11-24 12:13 | Install | 1 11 | root <root> | 2014-11-24 12:12 | Install | 10 10 | root <root> | 2014-11-24 12:10 | Install | 34 9 | root <root> | 2014-11-24 11:43 | Install | 1 8 | root <root> | 2014-11-24 11:12 | Install | 15 7 | root <root> | 2014-11-24 11:11 | Install | 1 6 | root <root> | 2014-11-24 08:58 | Install | 33 < 5 | root <root> | 2014-11-21 13:14 | Install | 1 > 4 | root <root> | 2014-11-12 20:21 | Install | 1 3 | root <root> | 2014-11-12 19:25 | Install | 1 2 | root <root> | 2014-11-12 11:14 | Install | 5 1 | System <unset> | 2014-11-12 09:42 | Install | 988 history list

 

检查本地yum状态

1

yum check

实例:

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[root@LinuxHost dvd]# yum check Loaded plugins: fastestmirror, refresh-packagekit, security check all

检查需要很长时间。

 

至此程序包管理工具介绍完结！！！谢谢浏览！！！！