Correct syntax to do mongodump of mongoDb docker instance?

Question

I'm running an ubuntu 16.04 LTS server with some docker container. One of these containers is a mongoDB container, where my data is stored. Now I'm trying to make a backup by mongodump. The problem for me is, that mongoDb is running as a docker container, and the backup should be stored outside of the docker container.

I think the syntax for this is something like this:

docker run \
  --rm \
  -it \
  --link DOCKER_CONTAINER_NAME:mongo_alias \
  -v /backup:/backup \
  mongo mongodump \
  --host mongo_alias \
  --out /backup/

But I'm not sure for the parameters I have to use...

This is what I get for my mongoDb container via docker ps:

7bee41bfa08a  mongo:3.4  "docker-entrypoint..."   4 months ago   Up 2 months   27017/tcp   mongo_db

And this is my docker-compose file:

version: "3"
services:
  mongo_db:
    container_name: mongo_db
    image: 'mongo:3.4'
    restart: 'always'
    volumes:
      - '/opt/mongo/project/live:/data/db'

So it should look like this?

docker run \
  --rm \
  -it \
  --link mongo_db:mongo_alias \ # mongo_alias can be choosen freely?
  -v /backup:/backup \          # Don't understand /backup:/backup
  mongo mongodump \
  --host mongo_alias \
  --out /backup/                # This is in the root of the server?

Matt · Accepted Answer · 2017-09-27 03:54:57Z

3

Define the backup to run via compose as well. This will create the new container on the same network as the main mongo container. If you have any compose network definitions you will need to duplicate them in each compose file.

Create a second compose file for the backup command: docker-compose-backup.yml

version: "3"
services:
  mongo_db_backup:
    image: 'mongo:3.4'
    volumes:
      - '/opt/mongo/project/live_backup:/backup'
    command: |
      mongodump --host mongo_db --out /backup/

Then run the backup

docker-compose -f docker-compose-backup.yml run mongo_db_backup

edited Sep 27, 2017 at 3:54

answered Sep 27, 2017 at 3:13

Matt

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7 Comments

user3142695 Over a year ago

But wouldn't this store the backups in the mongo_db_backup container?

Matt Over a year ago

@user3142695 No, it has the /backup volume mapped to the host as you did on the command line.

Matt Over a year ago

Maybe you want to use something like /opt/mongo/project/live_backup:/backup for the volume to house it near the data?

Matt Over a year ago

Left hand side of : is the server path or volume name. Right hand side is the path inside the container where the left hand volume will appear. This also means the UID the container process runs as will need write access to the servers /opt/mongo/project/live_backup directory. You might need to chown 999:999 /opt/mongo/project/live_backup in mongodb's case

Matt Over a year ago

output options are available in mongodump --help. -o=$(date +%s) and --gzip

|

carkod · Accepted Answer · 2020-12-06 18:27:49Z

2

You can also do this without docker-composer, directly from your host

Backup all databases

docker exec -t your-db-container mongodump --host mongo_db --out /backup/

Restore all databases

Move your backup folder to your host volume folder
docker exec -t your-db-container mongorestore /backup/

edited Dec 6, 2020 at 18:27

answered Dec 6, 2020 at 17:59

carkod

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Backup all databases

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