+h3. Part of a LoginCLuster federation
+
+If this cluster is part of a "federation with centralized user management":../admin/federation.html#LoginCluster , the login sync script also needs to be given the host and user token for the login cluster.
+
+<notextile>
+<pre>
+<code>shellserver:# <span class="userinput">umask 0700; tee /etc/cron.d/arvados-login-sync <<EOF
+ARVADOS_API_HOST="<strong>ClusterID.example.com</strong>"
+ARVADOS_API_TOKEN="<strong>xxxxxxxxxxxxxxxxx</strong>"
+LOGINCLUSTER_ARVADOS_API_HOST="<strong>LoginClusterID.example.com</strong>"
+LOGINCLUSTER_ARVADOS_API_TOKEN="<strong>yyyyyyyyyyyyyyyyy</strong>"
+ARVADOS_VIRTUAL_MACHINE_UUID="<strong>zzzzz-2x53u-zzzzzzzzzzzzzzz</strong>"
+*/2 * * * * root arvados-login-sync
+EOF</span></code>
+</pre>
+</notextile>
+
+