How do you set up a Cluster?

Centos 8.2
Virtualmin 6.13 Webmin 1.960

I have two identical servers and considering a Cluster. Any relevant guide?

I have searched and browsed the sys docs with no success…

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The only ‘clustering’ I have implemented is DNS Slave, and it works very well:

G

I was kinda figuring the works, one server failover to the other.