3.4 KiB
Duplicity Backup
Archived
I've moved on to using Restic Scheduler
Instructions
Mount any directories you'd like to back up as a volume and run
Env Variables
| Variable | Default | Description |
|---|---|---|
| AWS_ACCESS_KEY_ID | Required for writing to S3 | |
| AWS_DEFAULT_REGION | Required for writing to S3 | |
| AWS_SECRET_ACCESS_KEY | Required for writing to S3 | |
| BACKUP_DEST | file:///backups | Destination to store backups (See duplicity documenation) |
| BACKUP_NAME | backup | What the name for the backup should be. If using a single store for multiple backups, make sure this is unique |
| CLEANUP_COMMAND | An optional duplicity command to execute after backups to clean older ones out (eg. "remove-all-but-n-full 2") | |
| CRON_SCHEDULE | If you want to periodic incremental backups on a schedule, provide it here. By default we just backup once and exit | |
| FLOCK_WAIT | 60 | Seconds to wait for a lock before skipping a backup |
| FTP_PASSWORD | Used to provide passwords for some backends. May not work without an attached TTY | |
| FULL_CRON_SCHEDULE | If you want to periodic full backups on a schedule, provide it here. This requires an incremental cron schedule too | |
| GPG_KEY_ID | The ID of the key you wish to use. See Encryption section below | |
| OPT_ARGUMENTS | Any additional arguments to provide to the duplicity backup command | |
| PASSPHRASE | Correct.Horse.Battery.Staple | Passphrase to use for GPG |
| PATH_TO_BACKUP | /data | The path to the directory you wish to backup. If you want to backup multiple, see the tip below |
| RESTORE_ON_EMPTY_START | Set this to "true" and if the $PATH_TO_BACKUP is empty, it will restore the latest backup. This can be used for auto recovery from lost data |
|
| SKIP_ON_START | Skips backup on start if set to "true" | |
| VERIFY_CRON_SCHEDULE | If you want to verify your backups on a schedule, provide it here |
Encryption
By default Duplicity will use a symettric encryption using just your passphrase. If you wish to use a GPG key, you can add a ro mount to your ~/.gnupg directory and then provide the GPG_KEY_ID as an environment variable. The key will be used to sign and encrypt your files before sending to the backup destination.
Need to generate a key? Install gnupg and run gnupg --gen-key
Tips
Missing dependencies?
Please file a ticket! Duplicity supports a ton of backends and I haven't had a chance to validate that all dependencies are present in the image. If something is missing, let me know and I'll add it
Getting complains about no terminal for askpass?
Instead of using FTP_PASSWORD, add the password to the endpoint url
Backing up more than one source directory
Duplicity only accepts one target, however you can refine that selection with --exclude and --include arguments. The below example shows how this can be used to select multiple backup sources
OPT_ARGUMENTS="--include /home --include /etc --exclude '**'"
PATH_TO_BACKUP="/"
Backing up from another container
Mount all volumes from your existing container with --volumes-from and then back up by providing the paths to those volumes. If there are more than one volumes, you'll want to use the above tip for mulitple backup sources
Restoring a backup
On your running container, execute /restore.sh. That should be that! Eg. docker exec my_backup_container /restore.sh