logging - How to log information of a docker container -


i have docker-compose.yml file has 3 services 1) nginx : reverse-proxy 2) web : simple application takes performs classification using ridge classifier 3) viz : presents statistics of docker information, cpu used, number of containers used

below docker-compose.yml 

version: '2'  services:   web:     restart:     build: ./web     expose:       - "8000"     volumes:       - ./output:/usr/src/app/static     command: /usr/local/bin/gunicorn -w 2 -b :8000 --access-logfile - classifierv2restendpoint_ridge_nb:create_app()    nginx:     restart:     build: ./nginx/     ports:       - "80:80"     volumes:       - /www/static     volumes_from:       - web     links:       - web:web    viz:     image: dockersamples/visualizer     ports:       - 8080:8080/tcp     volumes:       - /var/run/docker.sock:/var/run/docker.sock     environment:       - "constraint=node.role==manager"

in 'web' service have simple ui takes excel file input , upon clicking submit button outputs result of classifier.

enter image description here if incorrectly select wrong file , click submit throws error

enter image description here

however when check docker-compose logs, not see why error happening. see this

enter image description here

i want see in program error happening not http post request log

web_1    | 172.19.0.4 - - [10/sep/2017:17:41:07 +0000] "post / http/1.0" 500 291 "http                                                          ://ec2-35-154-66-136.ap-south-1.compute.amazonaws.com/" "mozilla/5.0 (windows nt 10.0;                                                           win64; x64) applewebkit/537.36 (khtml, gecko) chrome/60.0.3112.113 safari/537.36

what should see error in classifier code?

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