1.查看当前版本

[root@IDC-D-1699 docker]# cat /etc/issue

CentOS release 6.8 (Final)

Kernel \r on an \m

2.升级Centos

[root@IDC-D-1699 docker]# yum update –y

3.内核升级至3.10

前往http://www.elrepo.org/

3.1下载升级包

[root@localhost ~]# rpm --import https://www.elrepo.org/RPM-GPG-KEY-elrepo.org

[root@localhost ~]# cd /etc/yum.repos.d/

[root@localhost yum.repos.d]# rpm -ivh http://www.elrepo.org/elrepo-release-6-6.el6.elrepo.noarch.rpm

[root@localhost yum.repos.d]# yum --enablerepo=elrepo-kernel install kernel-lt -y

3.2 修改grub.conf文件的default=0

[root@localhost yum.repos.d]# vim /etc/grub.conf

# 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/VolGroup-lv_root

#          initrd /initrd-[generic-]version.img

#boot=/dev/sda

default=0

timeout=5

3.3 重启并查看内核

[root@localhost yum.repos.d]# reboot

[root@localhost ~]# uname -r

3.10.94-1.el6.elrepo.x86_64

[root@localhost ~]# more /etc/issue

CentOS release 6.7 (Final)

Kernel \r on an \m