Git SSH with multiple Gitlab Instance

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I deployed Gitlab on AWS using the Guide Installing GitLab on Amazon Web Services (AWS) | GitLab but with a slight modification. I have 2 instances of gitlab instead of one. My question is does gitlab replicate ssh changes across all servers? what happens when I scale up additionally to say 3 instances?

I discovered that I can configure Fast Lookup Fast lookup of authorized SSH keys in the database | GitLab, if only I read further :grinning: