stack/monitor: Use free port in monitor httpd

stack/monitor/buildout.hash.cfg

@@ -14,7 +14,7 @@
 # not need these here).
 [monitor2-template]
 filename = instance-monitor.cfg.jinja2.in
-md5sum = 255b4f5f2d960ec958899114cef4cfd9
+md5sum = 1308d0476cfc3e7f885d6c03dd97cb8f
 
 [monitor-httpd-conf]
 _update_hash_filename_ = templates/monitor-httpd.conf.in

stack/monitor/instance-monitor.cfg.jinja2.in

@@ -315,10 +315,16 @@ monitor-url = ${:monitor-base-url}/public/feeds
 monitor-user = ${monitor-instance-parameter:username}
 monitor-password = ${monitor-instance-parameter:password}
 
+[monitor-address]
+recipe = slapos.cookbook:free_port
+minimum = 8196
+maximum = 8216
+ip = ${monitor-instance-parameter:monitor-httpd-ipv6}
+
 [monitor-instance-parameter]
 monitor-title = ${slap-configuration:instance-title}
 monitor-httpd-ipv6 = ${slap-configuration:ipv6-random}
-monitor-httpd-port = 8196
+monitor-httpd-port = ${monitor-address:port}
 # XXX - Set monitor-base-url = ${monitor-httpd-conf-parameter:url} => https://[ipv6]:port
 monitor-base-url = ${monitor-frontend:connection-secure_access}
 #monitor-base-url = ${monitor-httpd-conf-parameter:url}