Simple and brief popular DBMS catalogs.

Handy yum packages for CentOS

 yum -y update  
 yum -y groupinstall "Development Tools"  
 yum -y install firewalld libselinux-python wget mc epel-release python-pip ntp bash-completion nmap net-tools policycoreutils-python python-devel openssl-devel telnet bind-utils bash-completion-extras bpython mtr iotop htop autossh