当阿里云CentOS系统装gcc等包时报错的解决方法

阿里云主机为了系统安全防止误操作，centos系统镜像默认阻止了包含kernel字段的包更新、安装。
若执行
yum install gcc则会报如下错误：
--> Finished Dependency Resolution
Error: Package: glibc-headers-2.12-1.80.el6_3.6.x86_64 (updates)
           Requires: kernel-headers >= 2.2.1
Error: Package: glibc-headers-2.12-1.80.el6_3.6.x86_64 (updates)
           Requires: kernel-headers
You could try using --skip-broken to work around the problem
** Found 1 pre-existing rpmdb problem(s), 'yum check' output follows:
kernel-2.6.32-220.13.1.el6.x86_64 has missing requires of kernel-firmware >= ('0', '2.6.32', '220.13.1.el6')
此时，执行
sed -i "s/exclude=kernel*/#exclude=kernel*/g" /etc/yum.conf即可解决~