# docker-s3-volume-watch

Le principe est de synchroniser un dossier avec un volume s3.

Voici le fonctionnement :
- la commande prend comme paramètre le dossier source `/data/` et un bucket S3 `s3://bucket`
- il synchronise le bucket avec le dossier puis lance `inotify` pour resynchroniser le bucket dès qu'un évènement se produit dans le dossier (modification, création, suppression)

Inspiration : [docker-s3-volume](https://github.com/elementar/docker-s3-volume)

## README original

Creates a Docker container that is restored and backed up to a directory on s3.
You could use this to run short lived processes that work with and persist data to and from S3.

## Usage

For the simplest usage, you can just start the data container:

```bash
docker run -d --name my-data-container \
           elementar/s3-volume /data s3://mybucket/someprefix
```

This will download the data from the S3 location you specify into the
container's `/data` directory. When the container shuts down, the data will be
synced back to S3.

To use the data from another container, you can use the `--volumes-from` option:

```bash
docker run -it --rm --volumes-from=my-data-container busybox ls -l /data
```

### Configuring a sync interval

When the `BACKUP_INTERVAL` environment variable is set, a watcher process will
sync the `/data` directory to S3 on the interval you specify. The interval can
be specified in seconds, minutes, hours or days (adding `s`, `m`, `h` or `d` as
the suffix):

```bash
docker run -d --name my-data-container -e BACKUP_INTERVAL=2m \
           elementar/s3-volume /data s3://mybucket/someprefix
```

### Configuring credentials

If you are running on EC2, IAM role credentials should just work. Otherwise,
you can supply credential information using environment variables:

```bash
docker run -d --name my-data-container \
           -e AWS_ACCESS_KEY_ID=... -e AWS_SECRET_ACCESS_KEY=... \
           elementar/s3-volume /data s3://mybucket/someprefix
```

Any environment variable available to the `aws-cli` command can be used. see
http://docs.aws.amazon.com/cli/latest/userguide/cli-environment.html for more
information.

### Configuring an endpoint URL

If you are using an S3-compatible service (such as Oracle OCI Object Storage), you may want to set the service's endpoint URL:

```bash
docker run -d --name my-data-container -e ENDPOINT_URL=... \
           elementar/s3-volume /data s3://mybucket/someprefix
```

### Forcing a sync

A final sync will always be performed on container shutdown. A sync can be
forced by sending the container the `USR1` signal:

```bash
docker kill --signal=USR1 my-data-container
```

### Forcing a restoration

The first time the container is ran, it will fetch the contents of the S3
location to initialize the `/data` directory. If you want to force an initial
sync again, you can run the container again with the `--force-restore` option:

```bash
docker run -d --name my-data-container \
           elementar/s3-volume --force-restore /data s3://mybucket/someprefix
```

### Deletion and sync

By default if there are files that are deleted in your local file system, those will be deleted remotely. If you wish to turn this off, set the environment variable `S3_SYNC_FLAGS` to an empty string:

```bash
docker run -d -e S3_SYNC_FLAGS="" elementar/s3-volume /data s3://mybucket/someprefix
```

### Using Compose and named volumes

Most of the time, you will use this image to sync data for another container.
You can use `docker-compose` for that:

```yaml
# docker-compose.yaml
version: "2"

volumes:
  s3data:
    driver: local

services:
  s3vol:
    image: elementar/s3-volume
    command: /data s3://mybucket/someprefix
    volumes:
      - s3data:/data
  db:
    image: postgres
    volumes:
      - s3data:/var/lib/postgresql/data
```

## Contributing

1. Fork it!
2. Create your feature branch: `git checkout -b my-new-feature`
3. Commit your changes: `git commit -am 'Add some feature'`
4. Push to the branch: `git push origin my-new-feature`
5. Submit a pull request :D

## Credits

* Original Developer - Dave Newman (@whatupdave)
* Current Maintainer - Fábio Batista (@fabiob)

## License

This repository is released under the MIT license:

* www.opensource.org/licenses/MIT