CentOS7 notes

usermod -aG wheel jrobo

sudo yum install net-tools mc telnet

src

  # open one port
  sudo firewall-cmd --zone=public --add-port=30001/tcp --permanent
 
  # or range of ports
  sudo firewall-cmd --zone=public --add-port=30000-30009/tcp --permanent
 
  sudo firewall-cmd --reload 
  firewall-cmd --list-all