Docker学习笔记03：linux操作系统内核升级

在安装Docker时，发现操作系统内核版本过低。因为Docker对操作系统的内核是有要求的，所以，在此记录一下内核升级过程。

  提前准备好：CentOS  6.10 ISO镜像文件或者Oracle Etnterpres Linux 6.10)ISO

系统要求：

Docker目前只能运行在64位平台上，并且要求内核版本不低于3.10，实际上内核越新越好，过低的内核版本容易造成功能不稳定。

用户可以通过如下命令检查自己的内核版本详细信息：

三个命令都可以查看，详情如下图：

配置yum源：

创建文件上传目录以及挂载目录，上传iso文件到/root/linuxiso目录下.

进入yum源目录，备份原yum源配置：

创建新的本地yum源：

更新rpm包：

升级内核：

到/mnt/linuxiso/Packages，找到kernel-uek-4.1.12-124.16.4.el6uek.x86_64.rpm

内核包所依赖的包：

安装内核操作：

 

[root@test Packages]# yum install -y kernel-uek-4.1.12-124.16.4.el6uek.x86_64.rpm
Loaded plugins: security
Setting up Install Process
Examining kernel-uek-4.1.12-124.16.4.el6uek.x86_64.rpm: kernel-uek-4.1.12-124.16.4.el6uek.x86_64
Marking kernel-uek-4.1.12-124.16.4.el6uek.x86_64.rpm as an update to kernel-uek-2.6.39-200.24.1.el6uek.x86_64
Resolving Dependencies
--> Running transaction check
---> Package kernel-uek.x86_64 0:4.1.12-124.16.4.el6uek will be installed
--> Processing Conflict: kernel-uek-4.1.12-124.16.4.el6uek.x86_64 conflicts dracut < 004-303.0.3
--> Restarting Dependency Resolution with new changes.
--> Running transaction check
---> Package dracut.noarch 0:004-283.0.1.el6 will be updated
--> Processing Dependency: dracut = 004-283.0.1.el6 for package: dracut-kernel-004-283.0.1.el6.noarch
---> Package dracut.noarch 0:004-411.0.1.el6 will be an update
--> Running transaction check
---> Package dracut-kernel.noarch 0:004-283.0.1.el6 will be updated
---> Package dracut-kernel.noarch 0:004-411.0.1.el6 will be an update
--> Finished Dependency Resolution

Dependencies Resolved

===============================================================================================================================================================================================
 Package                               Arch                           Version                                          Repository                                                         Size
===============================================================================================================================================================================================
Installing:
 kernel-uek                            x86_64                         4.1.12-124.16.4.el6uek                           /kernel-uek-4.1.12-124.16.4.el6uek.x86_64                         145 M
Updating:
 dracut                                noarch                         004-411.0.1.el6                                  ol6_610                                                           129 k
Updating for dependencies:
 dracut-kernel                         noarch                         004-411.0.1.el6                                  ol6_610                                                            28 k

Transaction Summary
===============================================================================================================================================================================================
Install       1 Package(s)
Upgrade       2 Package(s)

Total size: 145 M
Total download size: 157 k
Downloading Packages:
-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Total                                                                                                                                                          1.7 MB/s | 157 kB     00:00     
Running rpm_check_debug
Running Transaction Test
Transaction Test Succeeded
Running Transaction
  Updating   : dracut-004-411.0.1.el6.noarch                                                                                                                                               1/5 
  Updating   : dracut-kernel-004-411.0.1.el6.noarch                                                                                                                                        2/5 
  Installing : kernel-uek-4.1.12-124.16.4.el6uek.x86_64                                                                                                                                    3/5 
  Cleanup    : dracut-kernel-004-283.0.1.el6.noarch                                                                                                                                        4/5 
  Cleanup    : dracut-004-283.0.1.el6.noarch                                                                                                                                               5/5 
  Verifying  : dracut-004-411.0.1.el6.noarch                                                                                                                                               1/5 
  Verifying  : kernel-uek-4.1.12-124.16.4.el6uek.x86_64                                                                                                                                    2/5 
  Verifying  : dracut-kernel-004-411.0.1.el6.noarch                                                                                                                                        3/5 
  Verifying  : dracut-004-283.0.1.el6.noarch                                                                                                                                               4/5 
  Verifying  : dracut-kernel-004-283.0.1.el6.noarch                                                                                                                                        5/5 

Installed:
  kernel-uek.x86_64 0:4.1.12-124.16.4.el6uek                                                                                                                                                   

Updated:
  dracut.noarch 0:004-411.0.1.el6                                                                                                                                                              

Dependency Updated:
  dracut-kernel.noarch 0:004-411.0.1.el6                                                                                                                                                       

Complete!

修改默认启动内核:

下图中，0代表启动的时候，使用第1个版本的内核。

# grub.conf generated by anaconda
#
# Note that you do not have to rerun grub after making changes to this file
# NOTICE:  You have a /boot partition.  This means that
#          all kernel and initrd paths are relative to /boot/, eg.
#          root (hd0,0)
#          kernel /vmlinuz-version ro root=/dev/mapper/vg00-lvroot
#          initrd /initrd-[generic-]version.img
#boot=/dev/sda
default=0    --默认是1，这里修改为0
timeout=5
splashimage=(hd0,0)/grub/splash.xpm.gz
hiddenmenu
title CentOS 6 (4.1.12-124.16.4.el6uek.x86_64)  --这里修改为升级后的内核版本号
        root (hd0,0)
        kernel /vmlinuz-2.6.32-696.el6.x86_64 ro root=/dev/mapper/vg00-lvroot rd_NO_LUKS LANG=en_US.UTF-8 rd_LVM_LV=vg00/lvroot rd_NO_MD SYSFONT=latarcyrheb-sun16 crashkernel=auto  KEYBOARDTYPE=pc KEYTABLE=us rd_NO_DM rhgb quiet
        initrd /initramfs-2.6.32-696.el6.x86_64.img

 

最后，重启操作系统：

 [root@test ~]# reboot                  #重启服务器

[root@test ~]# uname -r                 #查看内核是否升级成功。

如需iso文件，请留言。