Keycloak vs Authentik vs Zitadel on one VPS
Three self-hosted SSO servers, one small VPS. The RAM floor each one really needs, which handles apps that speak no SSO, and where each one loses.
#sso
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Authentik: self-hosted SSO for your apps
Run Authentik on Docker Compose for one login across every app you host: the env values that matter, the akadmin bootstrap, and forward auth via Traefik.