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The 389ds image healthcheck (dscontainer -H) only validates the LDAPI socket. On an empty volume, instance setup runs a temporary slapd that exposes LDAPI but not TCP 3389, so Docker marked the ldap service healthy too early. That let ldap-init start before the real slapd was listening, failing with "Can't contact LDAP server - 107 - Socket not connected". Override the healthcheck to probe the real TCP listener and bind as cn=Directory Manager with the configured password, and add a bounded wait loop to ldap-init so it retries until the server is reachable.