Open firewall port on CentOS 7 [closed]

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I am using CentOS 7 and I have to ensure that ports 2888 and 3888 are open.

I read this article but this did not work because on CentOS 7 OS there is no iptables save command.

Someone told me that the above URL is not valid for CentOS 7. and I should follow this.
But this article is not clear to me on exactly what command I need to execute.

I also found 

firewall-cmd --zone=public --add-port=2888/tcp

but this does not survive reboots.

So how can I open the ports and make it survive reboots?

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