Arangodump Examples

arangodump can be invoked in a command line by executing the following command:

arangodump --output-directory "dump"

This will connect to an ArangoDB server and dump all non-system collections from the default database (_system) into an output directory named dump. Invoking arangodump will fail if the output directory already exists. This is an intentional security measure to prevent you from accidentally overwriting already dumped data. If you are positive that you want to overwrite data in the output directory, you can use the parameter --overwrite true to confirm this:

arangodump --output-directory "dump" --overwrite true

arangodump will by default connect to the _system database using the default endpoint. If you want to connect to a different database or a different endpoint, or use authentication, you can use the following command-line options:

  • --server.database : name of the database to connect to
  • --server.endpoint : endpoint to connect to
  • --server.username : username
  • --server.password : password to use (omit this and you'll be prompted for the password)
  • --server.authentication : whether or not to use authentication

Here's an example of dumping data from a non-standard endpoint, using a dedicated database name:

arangodump --server.endpoint tcp://192.168.173.13:8531 --server.username backup --server.database mydb --output-directory "dump"

When finished, arangodump will print out a summary line with some aggregate statistics about what it did, e.g.:

Processed 43 collection(s), wrote 408173500 byte(s) into datafiles, sent 88 batch(es)

By default, arangodump will dump both structural information and documents from all non-system collections. To adjust this, there are the following command-line arguments:

  • --dump-data : set to true to include documents in the dump. Set to false to exclude documents. The default value is true.
  • --include-system-collections : whether or not to include system collections in the dump. The default value is false. Set to true if you are using named graphs that you are interested in restoring.

For example, to only dump structural information of all collections (including system collections), use:

arangodump --dump-data false --include-system-collections true --output-directory "dump"

To restrict the dump to just specific collections, there is is the --collection option. It can be specified multiple times if required:

arangodump --collection myusers --collection myvalues --output-directory "dump"

Structural information for a collection will be saved in files with name pattern .structure.json. Each structure file will contains a JSON object with these attributes:

  • parameters: contains the collection properties
  • indexes: contains the collection indexes

Document data for a collection will be saved in files with name pattern .data.json. Each line in a data file is a document insertion/update or deletion marker, alongside with some meta data.

Cluster Backup

Starting with Version 2.1 of ArangoDB, the arangodump tool also supports sharding. Simply point it to one of the coordinators and it will behave exactly as described above, working on sharded collections in the cluster.

Please see the Limitations.

As above, the output will be one structure description file and one data file per sharded collection. Note that the data in the data file is sorted first by shards and within each shard by ascending timestamp. The structural information of the collection contains the number of shards and the shard keys.

Note that the version of the arangodump client tool needs to match the version of the ArangoDB server it connects to.

Advanced Cluster Options

Starting with version 3.1.17, collections may be created with shard distribution identical to an existing prototypical collection; i.e. shards are distributed in the very same pattern as in the prototype collection. Such collections cannot be dumped without the referenced collection or arangodump yields an error.

arangodump --collection clonedCollection --output-directory "dump"

ERROR Collection clonedCollection's shard distribution is based on a that of collection prototypeCollection, which is not dumped along. You may dump the collection regardless of the missing prototype collection by using the --ignore-distribute-shards-like-errors parameter.

There are two ways to approach that problem. Dump the prototype collection as well:

arangodump --collection clonedCollection --collection prototypeCollection --output-directory "dump"

Processed 2 collection(s), wrote 81920 byte(s) into datafiles, sent 1 batch(es)

Or override that behavior to be able to dump the collection in isolation individually:

arangodump --collection clonedCollection --output-directory "dump" --ignore-distribute-shards-like-errors

Processed 1 collection(s), wrote 34217 byte(s) into datafiles, sent 1 batch(es)

Note that in consequence, restoring such a collection without its prototype is affected. See documentation on arangorestore for more details about restoring the collection.

Encryption

This feature is only available in the Enterprise Edition

Starting from version 3.3 encryption of the dump is supported.

The dump is encrypted using an encryption keyfile, which must contain exactly 32 bytes of data (required by the AES block cipher).

The keyfile can be created by an external program, or, on Linux, by using a command like the following:

dd if=/dev/random bs=1 count=32 of=yourSecretKeyFile

For security reasons, it is best to create these keys offline (away from your database servers) and directly store them in you secret management tool.

In order to create an encrypted backup, add the --encryption.keyfile option when invoking arangodump, in addition to any other option you are already using. The following example assumes that your secret key is stored in ~/SECRET-KEY:

arangodump --collection "secret-collection" dump --encryption.keyfile ~/SECRET-KEY

Note that arangodump will not store the key anywhere. It is the responsibility of the user to find a safe place for the key. However, arangodump will store the used encryption method in a file named ENCRYPTION in the dump directory. That way arangorestore can later find out whether it is dealing with an encrypted dump or not.

Trying to restore the encrypted dump without specifying the key will fail:

arangorestore --collection "secret-collection" dump --create-collection true

and arangorestore will report the following error:

the dump data seems to be encrypted with aes-256-ctr, but no key information was specified to decrypt the dump
it is recommended to specify either `--encryption.keyfile` or `--encryption.key-generator` when invoking arangorestore with an encrypted dump

It is required to use the exact same key when restoring the data. Again this is done by providing the --encryption.keyfile parameter:

arangorestore --collection "secret-collection" dump --create-collection true --encryption.keyfile ~/SECRET-KEY

Using a different key will lead to the backup being non-recoverable.

Note that encrypted backups can be used together with the already existing RocksDB encryption-at-rest feature, but they can also be used for the MMFiles engine, which does not have encryption-at-rest.