手动安装RPM包时,解决依赖性问题是一个非常大的麻烦。如果所有RPM包都是用手工安装,则RPM包的使用难道较大。因此,Red Hat 系列推出了 “yum 在线安装” 方法。
yum 在线安装优点:将所有软件包放在官方服务器上,当进行yum在线安装时,可以自动解决依赖性问题。
一、yum 源配置文件
1. 位置
/etc/yum.repos.d/CentOS-Base.repo
2. 内容实例(CentOS7)
[root/etc/yum.repos.d]$cat CentOS-Base.repo
# CentOS-Base.repo
[base]
name=CentOS-$releasever - Base
mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=os&infra=$infra
#baseurl=http://mirror.centos.org/centos/$releasever/os/$basearch/
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7
#released updates
[updates]
name=CentOS-$releasever - Updates
mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=updates&infra=$infra
#baseurl=http://mirror.centos.org/centos/$releasever/updates/$basearch/
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7
#additional packages that may be useful
[extras]
name=CentOS-$releasever - Extras
mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=extras&infra=$infra
#baseurl=http://mirror.centos.org/centos/$releasever/extras/$basearch/
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7
#additional packages that extend functionality of existing packages
[centosplus]
name=CentOS-$releasever - Plus
mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=centosplus&infra=$infra
#baseurl=http://mirror.centos.org/centos/$releasever/centosplus/$basearch/
gpgcheck=1
enabled=0
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7
3. 说明
\ | 说明 |
---|---|
[base] | 容器名称,一定要放在[]中 |
name | 容器说明,可以自己随便写 |
mirrorlist | 镜像站点 |
baseurl | yum源服务器地址 |
enabled | 此容器是否生效。不写或者enable=1生效,enable=0不生效 |
gpgcheck | RPM数字证书是否生效。1:生效;0:不生效 |
gpgkey | RPM数字证书公钥文件保存位置。一般不要修改。 |
关于 baseurl
baseurl 默认是CentOS官方的yum源服务器地址。是可以使用的,但是由于是国外网址,可能会出现访问较慢的问题,这时可以替换成其他yum源服务器地址。
常用yum源服务器地址
\ | 地址 |
---|---|
网易 | http://mirrors.163.com/.help/... |
搜狐 | http://mirrors.sohu.com/help/... |
清华大学 | https://mirrors.tuna.tsinghua... |
中国科学技术大学 | http://centos.ustc.edu.cn/hel... |
更多开源镜像见【四、常用的Linux国内开源镜像站整理】
4. 清除 yum 缓存
yum 会下载容器的清单到本机的/var/cache/yum
中,当我们修改了容器的网址却没有修改容器的名称时,可能会造成本机缓存中的列表与yum服务其中的列表不同步,此时就会出现无法更新的问题。
这种情况下,就需要清除 yum 缓存。
命令
yum clean [packages|headers|all]
参数
packages
:删除已下载的软件缓存文件
headers
:删除已下载的软件文件头缓存
all
:删除所有的容器缓存数据
实例
[root/var/cache/yum/x86_64/7]$yum clean packages
Loaded plugins: fastestmirror
Cleaning repos: base extras updates
0 package files removed
[root/var/cache/yum/x86_64/7]$yum clean headers
Loaded plugins: fastestmirror
Cleaning repos: base extras updates
0 header files removed
[root/var/cache/yum/x86_64/7]$yum clean all
Loaded plugins: fastestmirror
Cleaning repos: base extras updates
Cleaning up everything
Maybe you want: rm -rf /var/cache/yum, to also free up space taken by orphaned data from disabled or removed repos
Cleaning up list of fastest mirrors
5. 列出当前 yum 服务器的所有容器
命令
yum repolist all
实例
[vagrant~]$yum repolist all
Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile
* base: mirrors.aliyun.com
* extras: mirrors.aliyun.com
* updates: mirrors.huaweicloud.com
repo id repo name status
C7.0.1406-base/x86_64 CentOS-7.0.1406 - Base disabled
C7.0.1406-centosplus/x86_64 CentOS-7.0.1406 - CentOSPlus disabled
...省略...
base/7/x86_64 CentOS-7 - Base enabled: 9,911
base-debuginfo/x86_64 CentOS-7 - Debuginfo disabled
base-source/7 CentOS-7 - Base Sources disabled
...省略...
extras/7/x86_64 CentOS-7 - Extras enabled: 291
extras-source/7 CentOS-7 - Extras Sources disabled
fasttrack/7/x86_64 CentOS-7 - fasttrack disabled
updates/7/x86_64 CentOS-7 - Updates enabled: 626
updates-source/7 CentOS-7 - Updates Sources disabled
repolist: 10,828
6. yum-fastestmirror
插件
对centos系统管理员来说,yum绝对是个好东西,只可惜,官方yum源的速度实在让人不敢恭维,而非官方的yum源又五花八门,让人难以取舍。
幸运的是,yum-fastestmirror插件弥补了这一缺陷:自动选择最快的yum源。
安装
yum -y install yum-fastestmirror
配置文件
/etc/yum/pluginconf.d/fastestmirror.conf
/var/cache/yum/timedhosts.txt #yum镜像的速度测试记录文件
二、使用光盘搭建yam源
在没有网络的情况下,我们就无法使用 yum 在线安装。这时,我们可以使用光盘搭建 yum 源。
1. 挂载光盘
- 插入光盘
- 建立挂载点
[root/dev]$mkdir /mnt/cdrom
- 挂载光盘
[root/dev]$mount /dev/cdrom /mnt/cdrom/
mount: /dev/sr0 is write-protected, mounting read-only
2. 使网络yum源失效
- 进入
/etc/yum.repos.d
目录,修改网络yum源文件后缀名,使其失效
[root~]$cd /etc/yum.repos.d/
[root/etc/yum.repos.d]$mv CentOS-Base.repo CentOS-Base.repo.bak
3. 使光盘yum源生效
[root/etc/yum.repos.d]$vim CentOS-Media.repo
# CentOS-Media.repo
[c7-media]
name=CentOS-$releasever - Media
baseurl=file:///mnt/cdrom # 地址为光盘挂载地址
# file:///media/CentOS/ # 注释掉不存在的地址
# file:///media/cdrom/
# file:///media/cdrecorder/
gpgcheck=1
enabled=1 # 将enabled=0改为enabled=1,让这个yum源文件生效
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7
4. 可以使用 yum list
命令查看光盘yum源中的可用软件包
三、yum 常用命令
1. 查询
yum [list|info|search|provides|whatprovides] [参数]
查询所有可用软件包列表
yum list
yum list installed
可以查看所有已安装的软件
使用通配符匹配查询可用软件包列表
yum list [pattern]
- 实例
[root~]$yum list g?nc-[a-e]*
Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile
* base: mirrors.huaweicloud.com
* extras: mirrors.huaweicloud.com
* updates: mirrors.sohu.com
Available Packages
gvnc-devel.i686 0.7.0-3.el7 base
gvnc-devel.x86_64 0.7.0-3.el7 base
查询服务器上可供本机进行升级的软件列表
yum list updates
- 实例
[root/etc/yum.repos.d]$yum list updates
Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile
* base: mirrors.aliyun.com
* extras: mirrors.aliyun.com
* updates: mirrors.huaweicloud.com
Updated Packages
NetworkManager.x86_64 1:1.10.2-14.el7_5 updates
NetworkManager-libnm.x86_64 1:1.10.2-14.el7_5 updates
NetworkManager-ppp.x86_64 1:1.10.2-14.el7_5 updates
...省略...
搜索服务器上所有与关键字相关的包
yum search [关键字]
yum search all [关键字]
实例
[root~]$yum search fastestmirror
Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile
* base: mirrors.aliyun.com
* extras: mirrors.aliyun.com
* updates: mirrors.huaweicloud.com
==================================== N/S matched: fastestmirror ====================
yum-plugin-fastestmirror.noarch : Yum plugin which chooses fastest repository from a mirrorlist
Name and summary matches only, use "search all" for everything.
[root~]$yum search all fastestmirror
Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile
* base: mirrors.aliyun.com
* extras: mirrors.aliyun.com
* updates: mirrors.huaweicloud.com
==================================== Matched: fastestmirror ========================
yum-plugin-fastestmirror.noarch : Yum plugin which chooses fastest repository from a mirrorlist
2. 安装
语法
yum -y install [包名]
选项
-y
:提示是否安装依赖时,自动回答yes
install
:安装
实例
[root~]$yum install -y gcc
Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile
* base: mirrors.aliyun.com
* extras: mirrors.aliyun.com
* updates: mirrors.huaweicloud.com
base | 3.6 kB 00:00:00
extras | 3.4 kB 00:00:00
...省略...
Resolving Dependencies
--> Running transaction check
---> Package gcc.x86_64 0:4.8.5-28.el7 will be updated
--> Processing Dependency: gcc = 4.8.5-28.el7 for package: gcc-c++-4.8.5-28.el7.x86_64
...省略...
---> Package libstdc++-devel.x86_64 0:4.8.5-28.el7_5.1 will be an update
--> Finished Dependency Resolution
Dependencies Resolved
=======================================================================================
Package Arch Version Repository Size
=======================================================================================
Updating:
gcc x86_64 4.8.5-28.el7_5.1 updates 16 M
Updating for dependencies:
cpp x86_64 4.8.5-28.el7_5.1 updates 5.9 M
...省略...
Transaction Summary
=========================================================================================
Upgrade 1 Package (+8 Dependent packages)
Total download size: 32 M
Downloading packages:
Delta RPMs disabled because /usr/bin/applydeltarpm not installed.
(1/9): gcc-4.8.5-28.el7_5.1.x86_64.rpm | 16 MB 00:00:03
(2/9): libgcc-4.8.5-28.el7_5.1.i686.rpm | 108 kB 00:00:00
...省略...
(9/9): gcc-c++-4.8.5-28.el7_5.1.x86_64.rpm | 7.2 MB 00:00:06
----------------------------------------------------------------------------------------
Total 4.9 MB/s | 32 MB 00:00:06
Running transaction check
Running transaction test
Transaction test succeeded
Running transaction
Warning: RPMDB altered outside of yum.
Updating : libgcc-4.8.5-28.el7_5.1.x86_64 1/18
Updating : libstdc++-4.8.5-28.el7_5.1.x86_64 2/18
...省略...
Cleanup : libgomp-4.8.5-28.el7.x86_64 18/18
Verifying : libgomp-4.8.5-28.el7_5.1.x86_64 1/18
Verifying : libstdc++-4.8.5-28.el7_5.1.i686 2/18
...省略...
Verifying : libstdc++-4.8.5-28.el7.i686 18/18
Updated:
gcc.x86_64 0:4.8.5-28.el7_5.1
Dependency Updated:
cpp.x86_64 0:4.8.5-28.el7_5.1 gcc-c++.x86_64 0:4.8.5-28.el7_5.1 libgcc.i686 0:4.8.5-28.el7_5.1 libgcc.x86_64 0:4.8.5-28.el7_5.1 libgomp.x86_64 0:4.8.5-28.el7_5.1
libstdc++.i686 0:4.8.5-28.el7_5.1 libstdc++.x86_64 0:4.8.5-28.el7_5.1 libstdc++-devel.x86_64 0:4.8.5-28.el7_5.1
Complete!
3. 升级
在生产服务器中,除非当前软件版本有重大的BUG,否则尽量不对软件进行升级
使用yum -y update [包名]
命令时要极其谨慎,若未输入包名
,命令会变成yum -y update
,该命令 升级所有包同时也升级软件和系统内核,有可能造成系统重启甚至崩溃!
语法
yum -y update [包名]
yum -y upgrade [包名]
选项
-y
:提示是否安装依赖时,自动回答yes
update
:更新,后面接要更新的软件,否则将会更新所有包,改变软件设置和系统设置,更新系统版本内核
upgrade
:升级,后面接要升级的软件,否则将会升级所有包。
4. 卸载
在生产服务器中,服务器应使用最小化安装,用什么软件装什么软件,尽量不卸载
语法
yum -y remove [包名]
选项
-y
:提示是否安装依赖时,自动回答yes
remove
:卸载软件
实例
[root~]$yum -y remove zip
Loaded plugins: fastestmirror
Resolving Dependencies
--> Running transaction check
---> Package zip.x86_64 0:3.0-11.el7 will be erased
--> Finished Dependency Resolution
Dependencies Resolved
===========================================================================================
Package Arch Version Repository Size
===========================================================================================
Removing:
zip x86_64 3.0-11.el7 installed 796 k
Transaction Summary
===========================================================================================
Remove 1 Package
Installed size: 796 k
Downloading packages:
Running transaction check
Running transaction test
Transaction test succeeded
Running transaction
Erasing : zip-3.0-11.el7.x86_64 1/1
Verifying : zip-3.0-11.el7.x86_64 1/1
Removed:
zip.x86_64 0:3.0-11.el7
5. yum 软件组管理命令
列出所有可用软件组列表
yum grouplist
- 实例
[root~]$yum grouplist
Loaded plugins: fastestmirror
There is no installed groups file.
Maybe run: yum groups mark convert (see man yum)
Loading mirror speeds from cached hostfile
* base: mirrors.huaweicloud.com
* extras: mirrors.huaweicloud.com
* updates: mirrors.sohu.com
Available Environment Groups:
Minimal Install
Compute Node
Infrastructure Server
File and Print Server
Basic Web Server
Virtualization Host
Server with GUI
GNOME Desktop
KDE Plasma Workspaces
Development and Creative Workstation
Available Groups:
Compatibility Libraries
Console Internet Tools
Development Tools
Graphical Administration Tools
Legacy UNIX Compatibility
Scientific Support
Security Tools
Smart Card Support
System Administration Tools
System Management
Done
安装指定软件组,组名可以有grouplist查询出来
yum groupinstall [软件组名]
卸载指定软件组
yum groupremove [软件组名]
四、常用的Linux国内开源镜像站整理
【阿里云开源镜像站】:https://opsx.alibaba.com/
【华为开源镜像站】:http://mirrors.huaweicloud.com/
【网易开源镜像站】:http://mirrors.163.com/
【搜狐开源镜像站】:http://mirrors.sohu.com/
【清华大学开源软件镜像站】:https://mirrors.tuna.tsinghua...
【中国科学技术大学开源镜像站】:http://centos.ustc.edu.cn/
【上海大学开源镜像站】:http://mirrors.shu.edu.cn/
【浙江大学开源镜像站】:http://mirrors.zju.edu.cn/
【上海交通大学开源镜像站】:http://ftp.sjtu.edu.cn/
【重庆大学开源软件镜像站】:http://mirrors.cqu.edu.cn/
【南京大学开源镜像站】:http://mirrors.nju.edu.cn/
【南京邮电大学开源软件镜像站】:http://mirrors.njupt.edu.cn/
【东软信息学院开源镜像站】:http://mirrors.neusoft.edu.cn/
【兰州大学开源社区镜像站】:http://mirror.lzu.edu.cn/