An SMF manifest that works well on the TXD containers. More here, and also see the related Capistrano config

<?xml version='1.0'?>
<!DOCTYPE service_bundle SYSTEM '/usr/share/lib/xml/dtd/service_bundle.dtd.1'>
<service_bundle type='manifest' name='mongrel/example'>
  <service name='network/mongrel/example' type='service' version='0'>
    <create_default_instance enabled='true'/>
    <single_instance/>
    
    <dependency name='fs' grouping='require_all' restart_on='none' type='service'>
      <service_fmri value='svc:/system/filesystem/local'/>
    </dependency>
    <dependency name='net' grouping='require_all' restart_on='none' type='service'>
      <service_fmri value='svc:/network/loopback'/>
      <!-- need nfs/client because the mongrel stuff is on /home which is nfs mounted -->
      <service_fmri value='svc:/network/nfs/client'/>
    </dependency>
    <dependent name='mongrel_example' restart_on='none' grouping='optional_all'>
      <service_fmri value='svc:/milestone/multi-user'/>
    </dependent>
    
    <exec_method name='start' type='method' exec='/opt/csw/bin/mongrel_rails cluster::start' timeout_seconds='60'>
      <method_context working_directory='/home/example/rails/example.org/current'>
        <method_credential user='example' group='example' />
        <method_environment>
          <envvar name="PATH" value="/usr/bin:/bin:/opt/csw/bin" />
        </method_environment>
      </method_context>
    </exec_method>

    <exec_method name='stop' type='method' exec=':kill' timeout_seconds='60'>
      <method_context/>
    </exec_method>

  </service>
</service_bundle>