docker containers shutdown continuously - docker

Question

I follow the official tutorial of deploying docker services https://docs.docker.com/get-started/part5/#add-a-new-service-and-redeploy, in the first time i tried this the containers was running as expected but after that the containers shutdown and restarting (i notice that using the visualizer service provided by docker )
and when i execute the command :
docker stack ps getstartedlab
NAME DESIRED STATE CURRENT STATE
ERROR
getstartedlab_web.1 Running Preparing 2 seconds ago
\_ getstartedlab_web.1 Shutdown Failed 4 minutes ago
"task: non-zero exit (2)"
i read in this post https://github.com/docker/machine/issues/3747 that the problem came from the firewall that may block the icmp, i tried to ping docker.com and i had 100% loss packet but when i ping google.com it's ok with no loss packets.
the result of docker ps --all is :
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
9f67c82da7c7 username/repo:tag "python app.py" 2 minutes ago Exited (2) 2 minutes ago getstartedlab_web.2.zcnr0ld9bioy0dffsxmn8zss5
f59e413b0780 username/repo:tag "python app.py" 4 minutes ago Exited (2) 4 minutes ago getstartedlab_web.5.ymxgnsf7n8306yr8963xyyljv
9ab631c4057c username/repo:tag "python app.py" 10 minutes ago Exited (2) 10 minutes ago getstartedlab_web.5.zr3gsvgbyxs8c51fiko5h9jxp
bee5816ce1f2 dockersamples/visualizer:stable "npm start" 15 minutes ago Up 15 minutes 8080/tcp getstartedlab_visualizer.1.oyiqwb5esq6zakcdtiw4txh8a
cadca594f8cd username/repo:tag "python app.py" 24 hours ago Exited (2) 24 hours ago getstartedlab_web.1.zehutsl9cefrccqrj86dz4ap7
576b1a6db0b0 username/repo:tag "python app.py" 24 hours ago Exited (2) 24 hours ago getstartedlab_web.5.za9xvxpo5yvl20kha9sjcimmz
2804ebc4fc0c username/repo:tag "python app.py" 24 hours ago Exited (2) 24 hours ago getstartedlab_web.1.zlk42chspvym3jxkzs2nc8k2d
03efb2b04489 dockersamples/visualizer:stable "npm start" 24 hours ago Exited (255) 16 minutes ago 8080/tcp getstartedlab_visualizer.1.qyp4egtu9vcd31kf2jxtzxko3
b85fd1600955 username/repo:tag "python app.py" 2 days ago Exited (2) 2 days ago getstartedlab_web.5.kzrj3m5c3jgkuox0ulpszizee
and the
docker logs 9f67c82da7c7
python: can't open file 'app.py': [Errno 2] No such file or directory
exuse me for representation of the results of those commands because when i copy past the results the lines breaks, how to copy past and preserve the same displaying ?
can anyone have a fix to this problem ? thanks.