docker内部的mongodump不会创建任何文件

Question

I'm using docker to host mongo database and now I'm trying to dump the whole database. Everything is working fine, except no files are created. No errors at all. This is what I tried:

docker exec -ti mongodb mongodump --out /backup --host localhost -u admin -p admin

I'm using tutum/mongodb image from DockerHub. This is full log after execution of that command: http://pastebin.com/SXCqv16v

EDIT: output of docker inspect mongodb : http://pastebin.com/5sdheAwK

my docker-compose.yml file: http://pastebin.com/JmfKbtdJ

Answer 1

I believe you just need to map the /backup directory to a volume on the docker host. Change your docker compose mongodb entry to (replace /hostbackupdir with the appropriate folder on the host)

mongodb:
  image: tutum/mongodb
  environment:
    - MONGODB_PASS=admin
    - MONGODB_USER=admin
  container_name: mongodb
  volumes:
    - /hostbackupdir:/backup

Note: it's probably not a bad idea to also map your /data/db directory to one on your host too. that would be something like (replace /hostbackupdir and /hostdatadir with the appropriate folders on the host):

mongodb:
  image: tutum/mongodb
  environment:
    - MONGODB_PASS=admin
    - MONGODB_USER=admin
  container_name: mongodb
  volumes:
    - /hostbackupdir:/backup
    - /hostdatadir:/data/db

Answer 2

This is how I solved it. The problem was in binding the host folder with container folder:

mongodb:
  image: tutum/mongodb
  environment:
    - MONGODB_PASS=admin
    - MONGODB_USER=admin
  container_name: mongodb
  volumes:
    - ../backup:/backup