将Centos系统从7.0~7.7升级到7.8版本

 1. 检查内核版本

yum info kernel -q

 已安装的软件包
名称    ：kernel
架构    ：x86_64
版本    ：3.10.0
发布    ：862.el7
大小    ：62 M
源    ：installed
来自源：anaconda
简介    ： The Linux kernel
网址    ：http://www.kernel.org/
协议    ： GPLv2
描述    ： The kernel package contains the Linux kernel (vmlinuz), the core of any
         : Linux operating system.  The kernel handles the basic functions
         : of the operating system: memory allocation, process allocation, device
         : input and output, etc.

名称    ：kernel
架构    ：x86_64
版本    ：3.10.0
发布    ：862.14.4.el7
大小    ：62 M
源    ：installed
来自源：updates
简介    ： The Linux kernel
网址    ：http://www.kernel.org/
协议    ： GPLv2
描述    ： The kernel package contains the Linux kernel (vmlinuz), the core of any
         : Linux operating system.  The kernel handles the basic functions
         : of the operating system: memory allocation, process allocation, device
         : input and output, etc.

名称    ：kernel
架构    ：x86_64
版本    ：3.10.0
发布    ：957.1.3.el7
大小    ：63 M
源    ：installed
来自源：updates
简介    ： The Linux kernel
网址    ：http://www.kernel.org/
协议    ： GPLv2
描述    ： The kernel package contains the Linux kernel (vmlinuz), the core of any
         : Linux operating system.  The kernel handles the basic functions
         : of the operating system: memory allocation, process allocation, device
         : input and output, etc.

可安装的软件包
名称    ：kernel
架构    ：x86_64
版本    ：3.10.0
发布    ：1127.19.1.el7
大小    ：50 M
源    ：updates/7/x86_64
简介    ： The Linux kernel
网址    ：http://www.kernel.org/
协议    ： GPLv2
描述    ： The kernel package contains the Linux kernel (vmlinuz), the core of any
         : Linux operating system.  The kernel handles the basic functions
         : of the operating system: memory allocation, process allocation, device
         : input and output, etc.

2. 升级内核

yum upgrade kernel

 依赖关系解决

===========================================================================================================
 Package                                架构                           版本                                                源                               大小
===========================================================================================================
正在安装:
 kernel                                 x86_64                         3.10.0-1127.19.1.el7                                updates                          50 M
为依赖而更新:
 linux-firmware                         noarch                         20191203-76.gite8a0f4c.el7                          base                             81 M

===========================================================================================================

yum list kernel -q
已安装的软件包
kernel.x86_64                                                           3.10.0-862.el7                                                                  @anaconda
kernel.x86_64                                                           3.10.0-862.14.4.el7                                                             @updates
kernel.x86_64                                                           3.10.0-957.1.3.el7                                                              @updates
kernel.x86_64                                                           3.10.0-1127.19.1.el7                                                            @updates

reboot

删除旧的内核：

 ==========================================

更新CentOS

cat /etc/centos-release
CentOS Linux release 7.6.1810 (Core)

yum clean all

yum update

reboot

cat /etc/centos-release
CentOS Linux release 7.8.2003 (Core)

==========================================
注意：
1 升级CentOS和内核之后，python，yum等都没任何变化；
python的版本不会升级到 python3
2 如果把python2升级到python3，会导致yum无法使用；因此，不要把python2删除掉；yum默认使用python2；
3 CentOS上同时安装python2和python3会导致奇怪的错误，这些错误解决起来十分棘手。

 ==========================================

CentOS version 7[edit]

Latest version information[edit]

CentOS version 8[edit]

 ==========================================

REF

https://blog.ll00.cn/archives/87.html

https://en.wikipedia.org/wiki/CentOS

https://www.knownhost.com/wiki/dedicated-servers/kernel-version#:~:text=To%20view%20the%20current%20kernel,same%20CentOS%207%20operating%20system.&text=This%20command%20may%20run%20noticeably,or%20more%20plugins%20by%20default.

 https://www.jianshu.com/p/fdf6bb6c5b9c

https://www.howtoing.com/install-upgrade-kernel-version-in-centos-7/