Keycloak LDAP Sync
You set up keycloak ldap sync by adding your directory as a user source. The service then pulls user names, emails, and group ties into its local store. Most platform teams use this setup to keep one source of truth for people. They map directory groups straight to broad database or server roles. When those groups grant too much power, one login lets a user change critical data. How keycloak ldap sync works under the hood Your identity server talks to your directory over a network link. You g
Keycloak + LDAP Directory Services: the complete guide
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You set up keycloak ldap sync by adding your directory as a user source. The service then pulls user names, emails, and group ties into its local store. Most platform teams use this setup to keep one source of truth for people. They map directory groups straight to broad database or server roles. When those groups grant too much power, one login lets a user change critical data.
How keycloak ldap sync works under the hood
Your identity server talks to your directory over a network link. You give it a bind account so it can search the directory tree. Next, you define which branch holds user records and which holds groups. The system checks the directory when a user tries to log in. It can also run timed jobs to pull new or changed accounts.
Attribute mappers translate directory fields into local user profiles. One mapper copies the mail field while another reads group memberships. You can set the link to read-only or allow writes back to the directory. Most teams pick read-only mode so the central directory stays in full control. Once synced, the identity server issues tokens with those group names inside.
Choosing between import mode and no-import mode
You must decide if the identity server saves a copy of each user. In import mode, the system writes user attributes to its own database. This speeds up logins and lets you add extra local roles to a user. Still, local data can get stale if a sync job fails or lags.
If someone leaves the company, a slow timer leaves their account active too long. You have to tune the cache timer and sync schedule with care. Many teams run full sync jobs once a day and changed-user jobs every hour. Testing these timers in a staging setup prevents login lockouts during work hours.
Keycloak + LDAP Directory Services: architecture patterns and best practices
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What directory sync solves and what it misses
Syncing your directory stops you from making accounts by hand in every tool. When HR disables a user in the directory, the next sync blocks their login. It gives you a clean way to check who belongs to each team. This solves the basic problem of who can log in to your network.
Yet directory groups only decide who gets through the front door. Once a developer logs in with a valid group role, the identity server steps back. It cannot see which SQL queries they run or which server commands they type. A broad engineering group often gives full write rights to production databases. Syncing groups also does nothing to mask emails, phone numbers, or card numbers in query results. Teams still need a way to check each command and mask sensitive fields in flight.
Add runtime guardrails and masking beside your databases and APIs
Login rules, role grants, and CI checks govern who connects to your stack. Yet any allowed script, engineer, or AI agent still runs commands with the full scope of its role. For workloads on Postgres, MySQL, SQL Server, MongoDB, ClickHouse, Kubernetes, SSH, or internal HTTP services, hoop.dev sits inline in the protocol beside the service as an open-source proxy, a sidecar for your database or API. On every production query an agent or human runs, hoop.dev decides whether to pass, mask, block, or escalate it for review.
Before a query runs, hoop.dev guardrails check the statement against your rules, an AI Analyzer you configure can score intent or hold risky calls for human approval, and hoop.dev data masking rewrites sensitive fields in responses in memory. Explore the MIT-licensed project on GitHub.
Frequently asked questions
Does keycloak ldap sync copy user passwords into its own database?
By default, it does not copy password hashes into the local database. Instead, it checks the password against the directory server during each login.
How do I bring directory groups into tokens for my apps?
You add a group mapper to your directory link in the admin console. Then you add a token mapper so group names appear inside user tokens.
What happens if the directory server goes offline during a login?
Users cannot log in if the system must check passwords with the offline directory. Active sessions stay valid until the token expires or needs a fresh check.