In Keycloak, you can connect an existing LDAP. Keycloak has a built-in LDAP/AD provider. It is possible to include multiple different LDAP servers in the same Keycloak realm.
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Open the Keycloak Administration Console.
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In the Manage section, click User Federation.
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From the drop-down list, select ldap.
For more information, see https://www.keycloak.org/docs/latest/server_admin/#_ldap.