slaprunner: gunicorn has a log file

software/slaprunner/common.cfg

@@ -44,7 +44,7 @@ mode = 0644
 recipe = slapos.recipe.template
 url = ${:_profile_base_location_}/instance-runner.cfg
 output = ${buildout:directory}/template-runner.cfg.in
-md5sum = eee94d599cf53aae74bea28b3d037a1f
+md5sum = a0715b1ea6d21e9ecae3f98c751170f9
 mode = 0644
 
 [template-runner-import-script]

software/slaprunner/instance-runner.cfg

@@ -341,7 +341,8 @@ path_pid = $${directory:run}/gunicorn.pid
 
 [gunicorn-launcher]
 recipe = slapos.cookbook:wrapper
-command-line = $${gunicorn:bin_gunicorn} slapos.runner:app -p $${gunicorn:path_pid} -b unix:$${gunicorn:socket} -e RUNNER_CONFIG=$${slaprunner:slapos.cfg} --preload
+command-line = $${gunicorn:bin_gunicorn} slapos.runner:app -p $${gunicorn:path_pid} -b unix:$${gunicorn:socket} -e RUNNER_CONFIG=$${slaprunner:slapos.cfg} --error-logfile $${directory:log}/$${:error-log-file} --log-level error --preload 
+error-log-file = gunicorn-error.log
 wrapper-path = $${gunicorn:bin_launcher}
 environment = PATH=$${environ:PATH}:${git:location}/bin/
   RUNNER_CONFIG=$${slaprunner:slapos.cfg}