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：

package-cleanup --oldkernels --count=1

---> 软件包 kernel.x86_64.0.3.10.0-862.el7 将被 删除
---> 软件包 kernel.x86_64.0.3.10.0-862.14.4.el7 将被 删除
---> 软件包 kernel-devel.x86_64.0.3.10.0-862.el7 将被 删除
---> 软件包 kernel-devel.x86_64.0.3.10.0-862.14.4.el7 将被 删除

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

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]

hideCentOS version	Architectures	RHEL base	Kernel	CentOS release date	RHEL release date	Delay (days)
7.0-1406[110]	x86-64[111][b]	7.0	3.10.0-123	2014-07-07[27]	2014-06-10[112]	27
7.1-1503	x86-64	7.1	3.10.0-229	2015-03-31[113][114]	2015-03-05[115]	26
7.2-1511	x86-64	7.2	3.10.0-327	2015-12-14[116][117]	2015-11-19[118]	25
7.3-1611	x86-64	7.3	3.10.0-514	2016-12-12[119]	2016-11-03[120]	39
7.4-1708	x86-64	7.4	3.10.0-693	2017-09-13[121]	2017-07-31[122][103]	43
7.5-1804	x86-64	7.5	3.10.0-862	2018-05-10[123]	2018-04-10[124][103]	31
7.6-1810	x86-64	7.6	3.10.0-957	2018-12-03[125]	2018-10-30[126][103]	34
7.7-1908	x86-64	7.7	3.10.0-1062	2019-09-17[127]	2019-08-06[128][103]	42
7.8-2003	x86-64	7.8	3.10.0-1127	2020-04-27[129]	2020-03-30[130][103]	28
7.9-xxxx	x86-64	7.9	3.10.0-xxxx	TBA	TBA	?

Latest version information[edit]

CentOS version 8[edit]

hideCentOS version	Architectures	RHEL base	Kernel	CentOS release date	RHEL release date	Delay (days)
8.0-1905	x86-64, ppc64le, AArch64	8.0	4.18.0-80	2019-09-24[15]	2019-05-07[131][103]	140
8.1-1911		8.1	4.18.0-147	2020-01-15[132]	2019-11-05[133][103]	71
8.2-2004		8.2	4.18.0-193	2020-06-15[134]	2020-04-28[135][103]	48

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

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/