slapos/grid/svcbackend.py: Set the minimum number of file descriptors.

slapos/grid/svcbackend.py

@@ -101,6 +101,7 @@ def createSupervisordConfiguration(instance_root, watchdog_command=''):
           'supervisord_pidfile': os.path.abspath(
               os.path.join(instance_root, 'var', 'run', 'supervisord.pid')),
           'supervisord_logfile_backups': '10',
+          'supervisord_minfds': '4096',
           'watchdog_command': watchdog_command,
       }
   )

slapos/grid/templates/supervisord.conf.in

@@ -14,6 +14,7 @@ logfile_maxbytes = %(supervisord_logfile_maxbytes)s
 nodaemon = %(supervisord_nodaemon)s
 pidfile = %(supervisord_pidfile)s
 logfile-backups = %(supervisord_logfile_backups)s
+minfds = %(supervisord_minfds)s
 
 [unix_http_server]
 file=%(supervisord_socket)s