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tl;dr - Many people love 2-node clusters because they seem conceptually simpler and 33% cheaper, but while it’s possible to construct good ones, most will have subtle failure modes
The first step towards creating any HA system is to look for and try to eliminate single points of failure, often abbreviated as SPoF.
privacyIDEA is an open solution for strong two-factor authentication like OTP tokens, SMS, Smartphones or SSH keys. Using privacyIDEA you can enhance your existing applications like local login (PAM, Windows Credential Provider), VPN, remote access, SSH connections, access to web sites or web portals with a second factor during authentication. Thus boosting the security of your existing applications.