[id="modifying-app_{context}"]
= Modifying the {appserver_name} instance

The {appserver_name} servlet application requires additional configuration before it is secured by {project_name}.

.Prerequisites

* You created a client named *vanilla* in the *demo* realm.

* You saved a template XML file for this client.

.Procedure

. Go to the `standalone/configuration` directory in your {appserver_name} root directory.
. Open the `standalone.xml` file and search for the following text:
+
[source,xml]
----
<subsystem xmlns="urn:jboss:domain:keycloak:1.1"/>
----

. Change the XML entry from self-closing to using a pair of opening and closing tags as shown here:
+
[source,xml]
----
<subsystem xmlns="urn:jboss:domain:keycloak:1.1">
</subsystem>
----

. Paste the contents of the XML template within the `<subsystem>` element, as shown in this example:
+
[source,xml]
----
<subsystem xmlns="urn:jboss:domain:keycloak:1.1">
  <secure-deployment name="WAR MODULE NAME.war">
    <realm>demo</realm>
    <auth-server-url>http://localhost:8180/auth</auth-server-url>
    <public-client>true</public-client>
    <ssl-required>EXTERNAL</ssl-required>
    <resource>vanilla</resource>
  </secure-deployment>
</subsystem>
----

. Change `WAR MODULE NAME.war` to `vanilla.war`:
+
[source,xml]
----
<subsystem xmlns="urn:jboss:domain:keycloak:1.1">
  <secure-deployment name="vanilla.war">
  ...
</subsystem>
----

. Reboot the application server.