yum命令
检查更新
查看系统上已安装的程序包有哪些可用更新
yum check-update
~]# yum check-update
Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile
GeoIP.x86_64 1.5.0-14.el7 base
NetworkManager.x86_64 1:1.18.4-3.el7 base
NetworkManager-libnm.x86_64 1:1.18.4-3.el7 base
NetworkManager-team.x86_64 1:1.18.4-3.el7 base
NetworkManager-tui.x86_64 1:1.18.4-3.el7 base
acl.x86_64 2.2.51-15.el7 base
alsa-lib.x86_64 1.1.8-1.el7 base
...
GeoIP - 包的名称
x86_64 - 构建包的CPU架构
1.5.0 - 要安装的更新包的版本
base - 更新的程序包所在的存储库
更新程序包
我们可以一次更新一个、多个或所有程序包，更新时此程序包所有依赖的程序包也会进行更新。
更新单个程序包
yum update package_name
示例：更新bash程序包
~]# yum update bash
Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile
Resolving Dependencies
--> Running transaction check
---> Package bash.x86_64 0:4.2.46-31.el7 will be updated
---> Package bash.x86_64 0:4.2.46-34.el7 will be an update
--> Finished Dependency Resolution
Dependencies Resolved
=========================================================================================
Package Arch Version Repository Size
=========================================================================================
Updating:
bash x86_64 4.2.46-34.el7 base 1.0 M
Transaction Summary
=========================================================================================
Upgrade 1 Package
Total download size: 1.0 M
Is this ok [y/d/N]:
Loaded plugins - 显示Yum所有的插件
bash.x86_64 - 表示所要安装的更新包
yum默认情况下以交互方式运行
y 选项，表示同意安装更新
d 选项，yum会立即下载程序包而不安装它们。我们可以使用 yum localinstall 来安装这些程序包，不过此命令已经废弃，可直接使用 yum install 来安装。
下载的程序包默认保存在为 /var/cache/yum/basearch/releasever/packages/
N 取消安装更新
更新所有程序包及其依赖的程序包
yum update
更新与安全相关的包
如果程序包具有可用的安全更新，则只能将这些程序包更新为其最新版本。
yum update --security
查找程序包
yum search package_name
~]# yum search zsh
Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile
=================== N/S matched: zsh ==========================
autojump-zsh.noarch : Autojump for zsh
zsh-html.x86_64 : Zsh shell manual in html format
zsh.x86_64 : Powerful interactive shell
zsh-lovers.noarch : A collection of tips, tricks and examples for the Z shell
Name and summary matches only, use "search all" for everything.
默认情况下，yum search返回匹配的程序包的名称和摘要信息。
列出程序包
列出系统上所有已经安装和可用的程序包
yum list all
~]# yum list all
Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile
Installed Packages
GeoIP.x86_64 1.5.0-11.el7 @CentOS7-base
NetworkManager.x86_64 1:1.10.2-13.el7 @CentOS7-base
accountsservice.x86_64 0.6.45-7.el7 CentOS7-base
accountsservice-devel.i686 0.6.45-7.el7 CentOS7-base
......
如果程序包已经安装，在其对应的yum仓库名称前会有一个 @CentOS7-base 标志，如果没有安装，则没有任何标志CentOS7-base。
列出系统上已经安装的所有程序包，输出内容最右侧表示程序包所在的yum仓库。
yum list installed
~]# yum list installed
Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile
Installed Packages
GeoIP.x86_64 1.5.0-11.el7 @CentOS7-base
NetworkManager.x86_64 1:1.10.2-13.el7 @CentOS7-base
列出所有已启用存储库中的所有可用的程序包
yum list available
~]# yum list available
Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile
Available Packages
0ad.x86_64 0.0.22-1.el7 fedora-epel-7
0ad-data.noarch 0.0.22-1.el7 fedora-epel-7
0install.x86_64 2.11-1.el7 fedora-epel-7
列出所有程序包组
yum grouplist
[root@node1 ~]# yum groups list
Loaded plugins: fastestmirror
There is no installed groups file.
Maybe run: yum groups mark convert (see man yum)
Loading mirror speeds from cached hostfile
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
列出所有程序包组的组ID
[root@node1 ~]# yum grouplist ids
Loaded plugins: fastestmirror
There is no installed groups file.
Maybe run: yum groups mark convert (see man yum)
Loading mirror speeds from cached hostfile
Available Environment Groups:
Minimal Install (minimal)
Compute Node (compute-node-environment)
Infrastructure Server (infrastructure-server-environment)
File and Print Server (file-print-server-environment)
Basic Web Server (web-server-environment)
Virtualization Host (virtualization-host-environment)
Server with GUI (graphical-server-environment)
GNOME Desktop (gnome-desktop-environment)
KDE Plasma Workspaces (kde-desktop-environment)
Development and Creative Workstation (developer-workstation-environment)
Available Groups:
Compatibility Libraries (compat-libraries)
Console Internet Tools (console-internet)
Development Tools (development)
Graphical Administration Tools (graphical-admin-tools)
Legacy UNIX Compatibility (legacy-unix)
Scientific Support (scientific)
Security Tools (security-tools)
Smart Card Support (smart-card)
System Administration Tools (system-admin-tools)
System Management (system-management)
Done
列出所有的程序包的组ID及隐藏的ID
[root@node1 ~]# yum grouplist hidden ids
安装程序包组
安装程序包组有四种方法
yum group install "group name"
yum group install groupid
yum install @group
yum install @^group
以上四种方法是等价的，哪种简单用哪种。
示例：以Development Tools为例，显示四种安装方法
~]# yum group install "Development Tools"
~]# yum group install development
~]# yum install @"Development Tools"
~]# yum install @development
个人喜欢第四种，因为可以少打字。
卸载程序包组
yum group remove "group name"
yum group remove groupid
yum remove @group
yum remove @^group
示例：以Development Tools为例，显示四种卸载程序包组的方法
~]# yum group remove "Development Tools"
~]# yum group remove development
~]# yum remove @"Development Tools"
~]# yum remove @development
查看程序包信息
查看一个或多个程序包的信息
~]#yum info package_name1 [package_name2] [...]
示例：查看httpd程序包的信息。
~]# yum info httpd
Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile
Installed Packages
Name : httpd
Arch : x86_64
Version : 2.4.6
Release : 80.el7.centos
Size : 9.4 M
Repo : installed
From repo : CentOS7-base
Summary : Apache HTTP Server
URL : http://httpd.apache.org/
License : ASL 2.0
Description : The Apache HTTP Server is a powerful,
: efficient, and extensible web server.
安装程序包
安装程序包时 yum命令会自动解决依赖关系，将程序包及其所有未安装的依赖的程序包都安装。
安装单个程序包
~]# yum install package_name
安装多个程序包
安装多个程序包时，可以将多个程序包名以空格分隔来安装。
~]# yum install package_name1 [package_name2] [...]
默认安装程序包的最新版本，安装旧版本时需要指定版本号。
示例：同时安装多个程序包。
~]# yum install httpd mysql
当我们只是知道要安装的二进制文件的名称，而不知道其程序包名称，则可以为 yum install 提供路径名称。
~]# yum install /usr/bin/passwd
这时yum会搜索包列表，检索哪个包提供了/usr/bin/passwd，如果有的话就会提供我们安装。
查看指定的文件是由哪个程序包提供
yum provides “filename”
当我们只是知道一个命令，如ls，但不确定其到底安装在/bin目录还是/sbin/目录中，以及ls命令是由哪个程序包安装，我们可以使用 yum provides 命令。
# yum provides "*bin/ls"
Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile
coreutils-8.22-21.el7.x86_64 : A set of basic GNU tools
commonly used in shell scripts
Repo: CentOS7-base
Matched from:
Filename: /bin/ls
Filename: /usr/bin/ls
coreutils-8.22-21.el7.x86_64 : A set of basic GNU tools
commonly used in shell scripts
Repo: @CentOS7-base
Matched from:
Filename: /bin/ls
Filename: /usr/bin/ls
重新安装程序包
~]# yum reinstall httpd
卸载程序包
要卸载特定程序包以及依赖于它的任何程序包
yum remove package_name...
示例：卸载httpd程序包
~]# yum remove httpd
卸载多个程序包
~]# yum remove package_name1 [package_name2] [...]
列出yum仓库
列出系统上每个已启用仓库的仓库ID，名称和程序包数量。
~]# yum repolist
Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile
repo id repo name status
CentOS7-base CentOS7-base 9,911
docker-ce-7 docker-ce-7 156
fedora-epel-7 fedora-epel-7 12,661
yum repolist 只显示状态为enabled的仓库信息。使用 yum repoinfo命令列出仓库的更多信息，不过此命令在CentOS6系统上不可用。
列出已经启用和禁用的仓库
yum repolist all
~]# yum repolist all
Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile
repo id repo name status
C7.0.1406-base/x86_64 CentOS-7.0.1406 - Base disabled
CentOS7-base CentOS7-base enabled: 9,911
fedora-epel-7 fedora-epel-7 enabled: 12,661
最右侧输出的状态列 status 列出了相关仓库的启用和禁用状态。
添加Yum仓库
一般我们为方便管理都会在 /etc/yum.repos.d/目录中添加文件后缀为.repo的文件，而不是在/etc/yum.conf文件中添加。
互联网上的Yum仓库通常提供自己的.repo文件，我们只需要使用以下命令添加即可。
yum-config-manager --add-repo repository_url
其中repository_url是.repo文件的链接。
示例：给当前系统添加网易的CentOS源。
~]# yum-config-manager --add-repo http://mirrors.163.com/.help/CentOS7-Base-163.repo
启用Yum仓库
yum-config-manager --enable repositoryID
repositoryID是仓库的唯一ID（使用 yum repolist all 列出可用的存储库ID）
启用所有存储库
~]# yum-config-manager --enable \*
禁用Yum仓库
yum-config-manager --disable repositoryID
repositoryID是仓库的唯一ID（使用 yum repolist all 列出可用的存储库ID）
禁用所有存储库
~] yum-config-manager --disable \*
添加Yum仓库遇到的问题
[root@node1 ~]# yum-config-manager --add-repo https://mirrors.163.com/.help/CentOS7-Base-163.repo
Loaded plugins: fastestmirror
adding repo from: https://mirrors.163.com/.help/CentOS7-Base-163.repo
grabbing file https://mirrors.163.com/.help/CentOS7-Base-163.repo to /etc/yum.repos.d/CentOS7-Base-163.repo
Could not fetch/save url https://mirrors.163.com/.help/CentOS7-Base-163.repo to file /etc/yum.repos.d/CentOS7-Base-163.repo: [Errno 14] curl#60 - "Peer's Certificate has expired."
出现问题的原因是当前系统的时间与yum源的时间不一致导致。
解决办法：
[root@node1 ~]# yum -y install ntp
[root@node1 ~]# ntpdate time.windows.com
更新与安全相关的包
列出所有与安全相关的更新
yum --security check-update
如果程序包具有可用的安全更新，则将这些程序包更新为最新版本
yum --security update
只安装最安全的安全更新，忽略所有可能包含不安全新功能的包
yum --security update-minimal
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