====== CentOS ======

===== Firewall =====

CentOS 7:

Open ports:

  firewall-cmd --zone=public --add-port=[port]/tcp --permanent
  firewall-cmd --reload

List all open ports:

  firewall-cmd --list-ports

===== Timezone =====

CentOS 7:

List all timezones:

  timedatectl list-timezones

Set timezone:

  timedatectl set-timezone Asia/Shanghai