在了解 YUM 之前我们先来简单介绍下 RPM ，什么是 RPM ？ Redhat Package Manager 红帽包管理者；就像在 windows 中安装 .exe 一样，不过在安装 RPM 的时候会有很多的依赖关系，比如我们需要安装 MYSQL 软件包就需要安装其他一系列的其他软件例如：
[root@localhost Server]# rpm -ivh MySQL-python-1.2.1-1.i386.rpm
warning: MySQL-python-1.2.1-1.i386.rpm: Header V3 DSA signature: NOKEY, key ID 37017186
error: Failed dependencies:
libmysqlclient_r.so.15 is needed by MySQL-python-1.2.1-1.i386
libmysqlclient_r.so.15(libmysqlclient_15) is needed by MySQL-python-1.2.1-1.i386
mx is needed by MySQL-python-1.2.1-1.i386
mysql is needed by MySQL-python-1.2.1-1.i386
我们需要安装前面的几个具有依赖关系的数据包，而这些数据包需要手动的一个一个安装，非常的麻烦，而YUM能够解决RPM的依赖关系。
Yum （ Yellow dog Updater, Modified ）翻译成中文的意思就是黄狗软件升级工具。RHEL5.1以后的版本才默认安装的，之前的版本需要安装YUM软件包才能使用。
YUM不但解决了RPM软件包依赖关系，而且还方便更新，删除RPM包，同时也便于管理大量系统的更新问题。
由于本人环境有限，只有个RHEL5的虚拟机，之前版本的虚拟机被卸载了，而卸载YUM又需要卸载很多相关的依赖包，所以就没卸载
[root@localhost Server]# rpm -e yum
error: Failed dependencies:
yum >= 3.2.18 is needed by (installed) yum-security-1.1.16-13.el5.noarch
yum >= 3.2.19-15 is needed by (installed) yum-rhn-plugin-0.5.3-30.el5.noarch
yum >= 3.2.0 is needed by (installed) yum-updatesd-0.9-2.el5.noarch
yum >= 3.2.5-2 is needed by (installed) pirut-1.3.28-13.el5.noarch
没有安装yum的可以安装一下，我就直接用RHEL5的默认安装的了。
按照Linux国际化的标准，同所有的服务一样都有/etc/yum.conf这样一个配置文件。我们看下：
[root@localhost Server]# cat /etc/yum.conf |grep -v ^#
[main]
cachedir=/var/cache/yum
keepcache=0
debuglevel=2
logfile=/var/log/yum.log
distroverpkg=redhat-release
tolerant=1
exactarch=1
obsoletes=1
gpgcheck=1
plugins=1
metadata_expire=1h[mail] 声明以下是为YUM所作的选项
cachedir 是缓存存放的路径
keepcache 是指当安装完成后时候把该包的信息缓存下来
debuglevel 是错误级别
logfile 是yum软件日志的存放路径
distroverpkg 根据什么确定包的版本
tolerant 是否提示包安装信息错误
exactarch 根据CUP的架构来确定是否安装包
obsoletes yum升级相关选项
gpgcheck 时候检查包的签名
plugins 是否添加插件功能
metadata_expire 过期时间
[root@localhost Server]# cat /etc/yum.repos.d/rhel-debuginfo.repo
[rhel-debuginfo]
name=Red Hat Enterprise Linux $releasever - $basearch - Debug
baseurl=file:///mnt/Server/
enabled=1
gpgcheck=0
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-redhat-release
[ ] 里面的源的名字
name 对库描述
baseurl 下载源的URL路径
enabled 能否使用这个数据库
gpgcheck 同主配置文件一样，检查包的签名
gpgkey 签名的URL路径
刚刚中间提到了一个源的词；究竟什么是源？这个源就是下载源，把需要的RPM包做一个依赖关系的处理，createrepo创建源的命令不过需要使用RPM安装一下createrepo包才行，企5的DVD光盘中默认就存在这个源。
[root@localhost Server]# rpm -ivh createrepo-0.4.11-3.el5.noarch.rpm
warning: createrepo-0.4.11-3.el5.noarch.rpm: Header V3 DSA signature: NOKEY, key ID 37017186
Preparing... ########################################### [100%]
1:createrepo ########################################### [100%]
所有的配置就告一段落，下面就介绍下常用命令
yum install 包名→→→→→→→→安装包
yum update 包名→→→→→→→→升级包
yum remove 包名→→→→→→→→删除包
yum list 包名→→→→→→→→→→查询包的信息
yum clean all→→→→→→→→→→清空缓存信息
*******************************************************************
实例安装GCC
[root@localhost /]# umount /dev/cdrom
[root@localhost /]# mount /dev/cdrom /mnt/
mount: block device /dev/cdrom is write-protected, mounting read-only
[root@localhost /]# vim /etc/yum.repos.d/rhel-debuginfo.repo
[rhel-debuginfo]
name=Red Hat Enterprise Linux $releasever - $basearch - Debug
baseurl=file:///mnt/Server/
enabled=1
gpgcheck=0
:wq
[root@localhost /]# yum install gcc*
Loaded plugins: rhnplugin, security
This system is not registered with RHN.
RHN support will be disabled.
Setting up Install Process
Parsing package install arguments
Resolving Dependencies
--> Running transaction check
---> Package gcc-java.i386 0:4.1.2-44.el5 set to be updated
--> Processing Dependency: libgcj-devel = 4.1.2-44.el5 for package: gcc-java
---> Package gcc-gfortran.i386 0:4.1.2-44.el5 set to be updated
--> Processing Dependency: libgfortran = 4.1.2-44.el5 for package: gcc-gfortran
--> Processing Dependency: libgfortran.so.1 for package: gcc-gfortran
---> Package gcc43-gfortran.i386 0:4.3.2-7.el5 set to be updated
--> Processing Dependency: libgfortran43 = 4.3.2-7.el5 for package: gcc43-gfortran
--> Processing Dependency: libgfortran.so.3 for package: gcc43-gfortran
---> Package gcc-c++.i386 0:4.1.2-44.el5 set to be updated
--> Processing Dependency: libstdc++-devel = 4.1.2-44.el5 for package: gcc-c++
---> Package gcc.i386 0:4.1.2-44.el5 set to be updated
--> Processing Dependency: libgomp >= 4.1.2-44.el5 for package: gcc
--> Processing Dependency: glibc-devel >= 2.2.90-12 for package: gcc
---> Package gcc43.i386 0:4.3.2-7.el5 set to be updated
---> Package gcc-gnat.i386 0:4.1.2-44.el5 set to be updated
--> Processing Dependency: libgnat = 4.1.2-44.el5 for package: gcc-gnat
--> Processing Dependency: libgnat-4.1.so for package: gcc-gnat
--> Processing Dependency: libgnarl-4.1.so for package: gcc-gnat
---> Package gcc-objc.i386 0:4.1.2-44.el5 set to be updated
--> Processing Dependency: libobjc = 4.1.2-44.el5 for package: gcc-objc
--> Processing Dependency: libobjc.so.1 for package: gcc-objc
---> Package gcc43-c++.i386 0:4.3.2-7.el5 set to be updated
--> Processing Dependency: libstdc++43-devel = 4.3.2-7.el5 for package: gcc43-c++
---> Package gcc-objc++.i386 0:4.1.2-44.el5 set to be updated
--> Running transaction check
---> Package libgomp.i386 0:4.3.2-7.el5 set to be updated
---> Package glibc-devel.i386 0:2.5-34 set to be updated
--> Processing Dependency: glibc-headers = 2.5-34 for package: glibc-devel
--> Processing Dependency: glibc-headers for package: glibc-devel
---> Package libgfortran43.i386 0:4.3.2-7.el5 set to be updated
---> Package libgnat.i386 0:4.1.2-44.el5 set to be updated
---> Package libobjc.i386 0:4.1.2-44.el5 set to be updated
---> Package libstdc++-devel.i386 0:4.1.2-44.el5 set to be updated
---> Package libgcj-devel.i386 0:4.1.2-44.el5 set to be updated
--> Processing Dependency: zlib-devel for package: libgcj-devel
--> Processing Dependency: /usr/lib/libz.so for package: libgcj-devel
---> Package libstdc++43-devel.i386 0:4.3.2-7.el5 set to be updated
---> Package libgfortran.i386 0:4.1.2-44.el5 set to be updated
--> Running transaction check
---> Package zlib-devel.i386 0:1.2.3-3 set to be updated
---> Package glibc-headers.i386 0:2.5-34 set to be updated
--> Processing Dependency: kernel-headers >= 2.2.1 for package: glibc-headers
--> Processing Dependency: kernel-headers for package: glibc-headers
--> Running transaction check
---> Package kernel-headers.i386 0:2.6.18-128.el5 set to be updated
--> Finished Dependency Resolution
Dependencies Resolved
============================================================================
Package Arch Version Repository Size
============================================================================
Installing:
gcc i386 4.1.2-44.el5 rhel-debuginfo 5.2 M
gcc-c++ i386 4.1.2-44.el5 rhel-debuginfo 3.4 M
gcc-gfortran i386 4.1.2-44.el5 rhel-debuginfo 3.1 M
gcc-gnat i386 4.1.2-44.el5 rhel-debuginfo 11 M
gcc-java i386 4.1.2-44.el5 rhel-debuginfo 2.9 M
gcc-objc i386 4.1.2-44.el5 rhel-debuginfo 2.6 M
gcc-objc++ i386 4.1.2-44.el5 rhel-debuginfo 2.8 M
gcc43 i386 4.3.2-7.el5 rhel-debuginfo 8.1 M
gcc43-c++ i386 4.3.2-7.el5 rhel-debuginfo 3.8 M
gcc43-gfortran i386 4.3.2-7.el5 rhel-debuginfo 3.7 M
Installing for dependencies:
glibc-devel i386 2.5-34 rhel-debuginfo 2.0 M
glibc-headers i386 2.5-34 rhel-debuginfo 598 k
kernel-headers i386 2.6.18-128.el5 rhel-debuginfo 912 k
libgcj-devel i386 4.1.2-44.el5 rhel-debuginfo 1.4 M
libgfortran i386 4.1.2-44.el5 rhel-debuginfo 231 k
libgfortran43 i386 4.3.2-7.el5 rhel-debuginfo 240 k
libgnat i386 4.1.2-44.el5 rhel-debuginfo 989 k
libgomp i386 4.3.2-7.el5 rhel-debuginfo 67 k
libobjc i386 4.1.2-44.el5 rhel-debuginfo 102 k
libstdc++-devel i386 4.1.2-44.el5 rhel-debuginfo 2.9 M
libstdc++43-devel i386 4.3.2-7.el5 rhel-debuginfo 3.9 M
zlib-devel i386 1.2.3-3 rhel-debuginfo 100 k
Transaction Summary
============================================================================
Install 22 Package(s)
Update 0 Package(s)
Remove 0 Package(s)
Total download size: 60 M
Is this ok [y/N]:y
Downloading Packages:
------------------------------------------------------------------------------
Total 1.3 GB/s | 60 MB 00:00
Running rpm_check_debug
Running Transaction Test
Finished Transaction Test
Transaction Test Succeeded
Running Transaction
Installing : libgomp [ 1/22]
Installing : libgnat [ 2/22]
Installing : libgfortran [ 3/22]
Installing : libgfortran43 [ 4/22]
Installing : libobjc [ 5/22]
Installing : libstdc++43-devel [ 6/22]
Installing : kernel-headers [ 7/22]
Installing : glibc-headers [ 8/22]
Installing : glibc-devel [ 9/22]
Installing : libstdc++-devel [10/22]
Installing : zlib-devel [11/22]
Installing : gcc [12/22]
Installing : gcc43 [13/22]
Installing : libgcj-devel [14/22]
Installing : gcc-objc [15/22]
Installing : gcc-c++ [16/22]
Installing : gcc-gfortran [17/22]
Installing : gcc-java [18/22]
Installing : gcc-objc++ [19/22]
Installing : gcc-gnat [20/22]
Installing : gcc43-c++ [21/22]
Installing : gcc43-gfortran [22/22]
Installed: gcc.i386 0:4.1.2-44.el5 gcc-c++.i386 0:4.1.2-44.el5 gcc-gfortran.i386 0:4.1.2-44.el5 gcc-gnat.i386 0:4.1.2-44.el5 gcc-java.i386 0:4.1.2-44.el5 gcc-objc.i386 0:4.1.2-44.el5 gcc-objc++.i386 0:4.1.2-44.el5 gcc43.i386 0:4.3.2-7.el5 gcc43-c++.i386 0:4.3.2-7.el5 gcc43-gfortran.i386 0:4.3.2-7.el5
Dependency Installed: glibc-devel.i386 0:2.5-34 glibc-headers.i386 0:2.5-34 kernel-headers.i386 0:2.6.18-128.el5 libgcj-devel.i386 0:4.1.2-44.el5 libgfortran.i386 0:4.1.2-44.el5 libgfortran43.i386 0:4.3.2-7.el5 libgnat.i386 0:4.1.2-44.el5 libgomp.i386 0:4.3.2-7.el5 libobjc.i386 0:4.1.2-44.el5 libstdc++-devel.i386 0:4.1.2-44.el5 libstdc++43-devel.i386 0:4.3.2-7.el5 zlib-devel.i386 0:1.2.3-3
Complete!
------------------------------------------------------------------------------------------
凭借自己二把刀的水平写出来的，如果您发现那里有错误请通知我
谢谢 O(∩_∩)O~
转载于:https://blog.51cto.com/xiaoqi01/241142
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