Unit not found. trying to start firewall

I am using CentOS following these instructions on a new droplet. Any idea what’s wrong?

$ **sudo systemctl start firewalld**
[sudo] password for xxx:
Failed to start firewalld.service: Unit not found.
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This question was answered by @wyattbiker:

nvm. I had to first: sudo yum install firewalld

The tutorial makes no mention of it.


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