getenforce
setenforce
setenforce 0
setenforce 1
/etc/selinux/config
SELINUX=disabled
grub-instlal /dev/sdaN
でパーティションの先頭に install し直すrpm -qa
rpm -qa “rpc*”
rpm -qi PACKAGE
rpm -ql PACKAGE
rpm -qf FILE
/etc/yum.repos.d/CentOS-Base.repo
を編集yum check-update
yum update
yum update PACKAGE
yum install PACKAGE
yum clean
yum remove PACKAGE
yum info PACKAGE
yum list
yum search KEYWORD