hmmm..

https://www.techiecorner.com/3200/centos-7-how-to-setup-tui-firewall-settings/ http://lpseacehselatankab.blogspot.com/2017/02/mail-server-zimbra-86-bisa-kirim-dan.html https://www.dicloud.id/tutorial/articles/cara-menambahkan-swap-pada-ubuntu-16-04