====== CentOS7 notes ======

===== make user sudoer =====
  usermod -aG wheel jrobo

===== install basic software =====
  sudo yum install net-tools mc telnet


===== open tcp port =====
[[http://ask.xmodulo.com/open-port-firewall-centos-rhel.html|src]]
<code bash>
  # 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 
</code>