How to set Apache solr admin password

I an not very familiar with solr. I have installed solr successfully. It is using jetty webserver. My solr version is 4.10.3. It admin page is not protected by password. Anyone can access it. I want to apply a paaword on solr admin. How I will do it?

For version below 5

If you are using solr-webapp then you need to modify web.xml file and add these lines:

<security-constraint>
    <web-resource-collection>
      <web-resource-name>Solr Lockdown</web-resource-name>
      <url-pattern>/</url-pattern>
    </web-resource-collection>
    <auth-constraint>
      <role-name>solr_admin</role-name>
      <role-name>admin</role-name>
    </auth-constraint>
  </security-constraint>
  <login-config>
    <auth-method>BASIC</auth-method>
    <realm-name>Solr</realm-name>
  </login-config> 

For Jetty server, you need to add below lines in /example/etc/webdefault.xml

<security-constraint>
    <web-resource-collection>
      <web-resource-name>Solr authenticated application</web-resource-name>
      <url-pattern>/</url-pattern>
    </web-resource-collection>
    <auth-constraint>
      <role-name>**admin-role**</role-name>
    </auth-constraint>
  </security-constraint>

  <login-config>
    <auth-method>BASIC</auth-method>
    <realm-name>Test Realm</realm-name>
  </login-config>

Update /example/etc/jetty.xml file

<Call name="addBean">
      <Arg>
        <New class="org.eclipse.jetty.security.HashLoginService">
          <Set name="name">Test Realm</Set>
          <Set name="config"><SystemProperty name="jetty.home" default="."/>/etc/realm.properties</Set>
          <Set name="refreshInterval">0</Set>
        </New>
      </Arg>
    </Call>

/example/etc/realm.properties :

admin: s3cr3t, admin-role

Username = admin password = s3cr3t. Role name = admin-role

Solr version 5+

In latest Solr version folder structure got changed. You will find all files in below folder-path.

{SOLR_HOME}/server/etc/jetty.xml {SOLR_HOME}/server/etc/webdefault.xml

Create new credential file at {SOLR_HOME}/server/etc/realm.properties:

admin: s3cr3t, admin-role

For more info you can help solr wiki docs