dynamo-backup-to-s3

Stream DynamoDB backups to S3.

dynamo-backup-to-s3 is a utility to stream DynamoDB data to S3. Since the data is streamed directly from DynamoDB to S3 it is suitable for copying large tables directly. Tables are copied in parallel.

Can be run as a command line script or as an npm module.

Command line usage

  Usage: dynamo-backup-to-s3 [options]

  Options:

    -h, --help                       output usage information
    -V, --version                    output the version number
    -b, --bucket <name>              S3 bucket to store backups
    -s, --stop-on-failure            specify the reporter to use
    -r, --read-percentage <decimal>  specific the percentage of Dynamo read capacity to use while backing up. default .25 (25%)
    -x, --excluded-tables <list>     exclude these tables from backup
    -i, --included-tables <list>     only backup these tables
    -p, --backup-path <name>         backup path to store table dumps in. default is DynamoDB-backup-YYYY-MM-DD-HH-mm-ss
    --aws-key                        AWS access key. Will use AWS_ACCESS_KEY_ID env var if --aws-key not set
    --aws-secret                     AWS secret key. Will use AWS_SECRET_ACCESS_KEY env var if --aws-secret not set
    --aws-region                     AWS region. Will use AWS_DEFAULT_REGION env var if --aws-region not set

npm module usage

Quick Example

var DynamoBackup = require('dynamo-backup-to-s3');

var backup = new DynamoBackup({
    excludedTables: ['development-table1', 'development-table2'],
    readPercentage: .5,
    bucket: 'my-backups',
    stopOnFailure: true,
    awsAccessKey: /* AWS access key */,
    awsSecretKey: /* AWS secret key */,
    awsSecretKey: /* AWS region */
});

backup.on('error', function(data) {
    console.log('Error backing up ' + data.tableName);
    console.log(data.error);
});

backup.on('start-backup', function(tableName) {
    console.log('Starting to copy table ' + tableName);
});

backup.on('end-backup', function(tableName) {
    console.log('Done copying table ' + tableName);
});

backup.backupAllTables(function() {
    console.log('Finished backing up DynamoDB');
});

Documentation

Constructor

var options = {
    excludedTables: /* tables to exclude from backup */,
    includedTables: /* only back up these tables */
    readPercentage: /* only consume this much capacity.  expressed as a decimal (i.e. .5 means use 50% of table read capacity).  default: .25 */,
    bucket:         /* bucket to upload the backup to */,
    stopOnFailure:  /* whether or not to continue backing up if a single table fails to back up */,
    awsAccessKey:   /* AWS access key */,
    awsSecretKey:   /* AWS secret key */,
    awsSecretKey:   /* AWS region */,
    backupPath:     /* folder to save backups in.  default: 'DynamoDB-backup-YYYY-MM-DD-HH-mm-ss'
};

var backup = new DynamoBackup(options);

Events

error

Raised when there is an error backing up a table

Example

backup.on('error', function(data) {
    console.log('Error backing up ' + data.tableName);
    console.log(data.error);
});

start-backup

Raised when the backup of a table is begining

Example

backup.on('start-backup', function(tableName) {
    console.log('Starting to copy table ' + tableName);
});

end-backup

Raised when the backup of a table is finished

Example

backup.on('end-backup', function(tableName) {
    console.log('Done copying table ' + tableName);
});

Functions

backupAllTables

Backups all tables in the given region while respecting the excludedTables and includedTables options

Arguments

• callback(err) - callback which is called when all backups are complete, or an error occurs and stopOnFailure is true

backupTable

Backups all tables in the given region while respecting the excludedTables and includedTables options

Arguments

• tableName - name of the table to backup
• backupPath - (optional) the path to use for the backup. The iterator is passed a callback(err) which must be called once it has completed. If no error has occurred, the callback should be run without arguments or with an explicit null argument.
• callback(err) - A callback which is called when the table has finished backing up, or an error occurs