+if ! grep '<category id="plc_rt">' /etc/planetlab/default_config.xml ; then
+ sed -i 's|<category id="plc_net">| <category id="plc_rt">\n <name>RT Configuration</name>\n <description>RT</description>\n <variablelist>\n <variable id="enabled" type="boolean">\n <name>Enabled</name>\n <value>false</value>\n <description>Enable on this machine.</description>\n </variable>\n <variable id="host" type="hostname">\n <name>Hostname</name>\n <value>localhost.localdomain</value>\n <description>The fully qualified hostname.</description>\n </variable>\n <variable id="ip" type="ip">\n <name>IP Address</name>\n <value/>\n <description>The IP address of the RT server.</description>\n </variable>\n </variablelist>\n </category>\n <category id="plc_net">|' /etc/planetlab/default_config.xml
+fi
+if ! grep '<category id="plc_zabbix">' /etc/planetlab/default_config.xml ; then
+ sed -i 's|<category id="plc_net">| <category id="plc_zabbix">\n <name>Zabbix Configuration</name>\n <description>Zabbix</description>\n <variablelist>\n <variable id="enabled" type="boolean">\n <name>Enabled</name>\n <value>false</value>\n <description>Enable on this machine.</description>\n </variable>\n <variable id="host" type="hostname">\n <name>Hostname</name>\n <value>localhost.localdomain</value>\n <description>The fully qualified hostname.</description>\n </variable>\n <variable id="ip" type="ip">\n <name>IP Address</name>\n <value/>\n <description>The IP address of the Zabbix server.</description>\n </variable>\n </variablelist>\n </category>\n <category id="plc_net">|' /etc/planetlab/default_config.xml
+fi
+
+# NOTE: enable monitor by default, since we're installing it.
+plc-config --save /etc/planetlab/default_config.xml \
+ --category plc_monitor --variable enabled --value true