解决Centos 6升级提示At least 16MB more space needed on the /boot filesystem的方法

遇到错误：

Transaction Check Error:
  installing package kernel-2.6.32-504.8.1.el6.x86_64 needs 16MB on the /boot filesystem

Error Summary
-------------
Disk Requirements:
  At least 16MB more space needed on the /boot filesystem.

查看一下：

# df -h
Filesystem      Size  Used Avail Use% Mounted on
/dev/sda3       458G  214G  221G  50% /
tmpfs           1.9G     0  1.9G   0% /dev/shm
/dev/sda1        99M   82M   13M  87% /boot

解决方法：删除旧版的kernel

1. 查看当前使用的kernel

# uname -r
2.6.32-431.1.2.0.1.el6.x86_64

2. 查看系统已安装的kernel:

# rpm -qa | grep kernel
kernel-2.6.32-358.el6.x86_64
abrt-addon-kerneloops-2.0.8-21.el6.centos.x86_64
kernel-devel-2.6.32-358.6.1.el6.x86_64
libreport-plugin-kerneloops-2.0.9-19.el6.centos.x86_64
kernel-2.6.32-358.6.1.el6.x86_64
kernel-devel-2.6.32-431.1.2.0.1.el6.x86_64
dracut-kernel-004-336.el6_5.2.noarch
kernel-firmware-2.6.32-431.1.2.0.1.el6.noarch
kernel-headers-2.6.32-431.1.2.0.1.el6.x86_64
kernel-2.6.32-431.1.2.0.1.el6.x86_64

删除旧kernel:

# yum remove kernel-2.6.32-358.el6.x86_64 kernel-2.6.32-358.6.1.el6.x86_64 kernel-devel-2.6.32-358.6.1.el6.x86_64

再查看/boot 空间：

# df -h | grep boot
/dev/sda1        99M   30M   65M  32% /boot