Central Linux logins: LDAP or SSH CA
Centralize Linux logins so one change reaches every server. Compare a directory with SSSD, an SSH certificate authority, and Ansible-managed keys.
#identity
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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.