Update software Centos

Import Gpg Key untuk Paket Software

rpm --import /etc/pki/rpm-gpg/RPM-GPG-KEY* 

Enable the contrib and centosplus repositories:

vi /etc/yum.repos.d/CentOS-Base.repo

Edit the lines below:

[base]
[...]
exclude=postfix
[...]
[update]
[...]
exclude=postfix
[...]
[centosplus]
[...]
enabled=1
includepkgs=postfix
[...]
[contrib]
[...]
enabled=1
[...]

Update Paket Sistem

yum update