[id='configuring-infinispan-{context}']
= Configuring {jdgserver_name} Clusters
Configure {jdgserver_name} clusters to replicate {project_name} data across data centers.

.Prerequisites

* Install and set up {jdgserver_name} Server.

.Procedure

. Open `infinispan.xml` for editing.
+
By default, {jdgserver_name} Server uses `server/conf/infinispan.xml` for static configuration such as cluster transport and security mechanisms.

. Create a stack that uses TCPPING as the cluster discovery protocol.
+
[source,xml,options="nowrap",subs=attributes+]
----
<stack name="global-cluster" extends="tcp">
    <!-- Remove MPING protocol from the stack and add TCPPING -->
    <TCPPING initial_hosts="server1[7800],server2[7800]" <1>
             stack.combine="REPLACE" stack.position="MPING"/>
</stack>
----
<1> Lists the host names for `server1` and `server2`.
+
. Configure the {jdgserver_name} cluster transport to perform Cross-Datacenter replication.
.. Add the RELAY2 protocol to a JGroups stack.
+
[source,xml,options="nowrap",subs=attributes+]
----
<jgroups>
   <stack name="xsite" extends="udp"> <1>
      <relay.RELAY2 site="site1" <2>
                    max_site_masters="1000"/> <3>
      <remote-sites default-stack="global-cluster"> <4>
         <remote-site name="site1"/>
         <remote-site name="site2"/>
      </remote-sites>
   </stack>
</jgroups>
----
<1> Creates a stack named `xsite` that extends the default UDP cluster transport.
<2> Adds the RELAY2 protocol and names the cluster you are configuring as `site1`. The site name must be unique to each {jdgserver_name} cluster.
<3> Sets 1000 as the number of relay nodes for the cluster. You should set a value that is equal to or greater than the maximum number of nodes in your {jdgserver_name} cluster.
<4> Names all {jdgserver_name} clusters that backup caches with {jdgserver_name} data and uses the default TCP stack for inter-cluster transport.
+
.. Configure the {jdgserver_name} cluster transport to use the stack.
+
[source,xml,options="nowrap",subs=attributes+]
----
<cache-container name="default" statistics="true">
      <transport cluster="${infinispan.cluster.name:cluster}"
                 stack="xsite"/> <1>
</cache-container>
----
<1> Uses the `xsite` stack for the cluster.
+
. Configure the keystore as an SSL identity in the server security realm.
+
[source,xml,options="nowrap",subs=attributes+]
----
<server-identities>
  <ssl>
    <keystore path="server.jks" <1>
              relative-to="infinispan.server.config.path"
              keystore-password="password" <2>
              alias="server" /> <3>
  </ssl>
</server-identities>
----
<1> Specifies the path of the keystore that contains the SSL identity.
<2> Specifies the password to access the keystore.
<3> Names the alias of the certificate in the keystore.
+
. Configure the authentication mechanism for the Hot Rod endpoint.
+
[source,xml,options="nowrap",subs=attributes+]
----
<endpoints socket-binding="default">
   <hotrod-connector name="hotrod">
      <authentication>
ifeval::[{project_product}==true]
         <sasl mechanisms="DIGEST-MD5" <1>
endif::[]
ifeval::[{project_community}==true]
         <sasl mechanisms="SCRAM-SHA-512" <1>
endif::[]
               server-name="infinispan" /> <2>
      </authentication>
   </hotrod-connector>
   <rest-connector name="rest"/>
</endpoints>
----
<1> Configures the SASL authentication mechanism for the Hot Rod endpoint.  SCRAM-SHA-512 is the default SASL mechanism for Hot Rod. However you can use whatever is appropriate for your environment, such as DIGEST-MD5 or GSSAPI.
<2> Defines the name that {jdgserver_name} servers present to clients. You specify this name in the Hot Rod client configuration when you set up {project_name}.
+
. Create a cache template.
+
NOTE: Add the cache template to `infinispan.xml` on each node in the {jdgserver_name} cluster.
+
[source,xml,options="nowrap",subs=attributes+]
----
<cache-container ... >
  <replicated-cache-configuration name="sessions-cfg" <1>
                                  mode="SYNC"> <2>
    <locking acquire-timeout="0" /> <3>
    <backups>
      <backup site="site2" strategy="SYNC" /> <4>
    </backups>
  </replicated-cache-configuration>
</cache-container>
----
<1> Creates a cache template named `sessions-cfg`.
<2> Defines a cache that synchronously replicates data across the cluster.
<3> Disables timeout for lock acquisition.
<4> Names the backup site for the {jdgserver_name} cluster you are configuring.
+
. Start {jdgserver_name} server1.
+
[source,bash,options="nowrap",subs=attributes+]
----
./server.sh -c infinispan.xml -b PUBLIC_IP_ADDRESS -k PUBLIC_IP_ADDRESS -Djgroups.mcast_addr=228.6.7.10
----
+
. Start {jdgserver_name} server2.
+
[source,bash,options="nowrap",subs=attributes+]
----
./server.sh -c infinispan.xml -b PUBLIC_IP_ADDRESS -k PUBLIC_IP_ADDRESS -Djgroups.mcast_addr=228.6.7.11
----

+
. Check {jdgserver_name} server logs to verify the clusters form cross-site views.
+
[source,options="nowrap",subs=attributes+]
----
INFO  [org.infinispan.XSITE] (jgroups-5,${server.hostname}) ISPN000439: Received new x-site view: [site1]
INFO  [org.infinispan.XSITE] (jgroups-7,${server.hostname}) ISPN000439: Received new x-site view: [site1, site2]
----

ifeval::[{project_product}==true]
[role="_additional-resources"]
.Additional resources
link:https://access.redhat.com/documentation/en-us/red_hat_data_grid/8.1/html-single/data_grid_server_guide/index#start_server[Getting Started with Data Grid Server] +
link:https://access.redhat.com/documentation/en-us/red_hat_data_grid/8.1/html-single/data_grid_guide_to_cross-site_replication/index#configure_relay-xsite[Configuring Data Grid Clusters for Cross-Site Replication] +
link:https://access.redhat.com/documentation/en-us/red_hat_data_grid/8.1/html-single/data_grid_server_guide/index#ssl_identity-server[Setting Up SSL Identities for Data Grid Server] +
link:https://access.redhat.com/documentation/en-us/red_hat_data_grid/8.1/html-single/data_grid_server_guide/index#configuring_endpoints[Configuring Data Grid Endpoints] +
link:https://access.redhat.com/documentation/en-us/red_hat_data_grid/8.1/html-single/data_grid_server_guide/index#configure_hotrod_authentication-server[Configuring Hot Rod Authentication Mechanisms]
endif::[]