Zenko Backbeat

OVERVIEW

Backbeat is an engine with a messaging system at its heart. It's part of Zenko, Scality’s Open Source Multi-Cloud Data Controller. Learn more about Zenko at Zenko.io

Backbeat is optimized for queuing metadata updates and dispatching work to long-running tasks in the background. The core engine can be extended for many use cases, which are called extensions, as listed below.

EXTENSIONS

Asynchronous Replication

This feature replicates objects from one S3 bucket to another S3 bucket in a different geographical region. The extension uses the local Metadata journal as the source of truth and replicates object updates in a FIFO order.

DESIGN

QUICKSTART

This guide assumes the following:

Using MacOS
brew is installed (get it here)
node is installed (version 6.9.5)
yarn is installed (version 3.10.10)
aws is installed (version 1.11.1)

Kafka and Zookeeper

Install and start kafka and zookeeper servers

mkdir ~/kafka && \
cd ~/kafka && \
curl https://archive.apache.org/dist/kafka/0.11.0.0/kafka_2.11-0.11.0.0.tgz | \
tar xvz && \
sed 's/zookeeper.connect=.*/zookeeper.connect=localhost:2181\/backbeat/' \
kafka_2.11-0.11.0.0/config/server.properties > \
kafka_2.11-0.11.0.0/config/server.properties.backbeat

Start the zookeeper server:

zookeeper-server-start kafka_2.11-0.11.0.0/config/zookeeper.properties

In a different Shell start the kafka server:

kafka-server-start kafka_2.11-0.11.0.0/config/server.properties.backbeat

Install and run Redis on port 6379 (default port)

The "Failed Entry Processor" (started by Queue Populator) stores the "failed replication entries" to the Redis sorted set.

Create log offset Zookeeper node

zkCli -server localhost:2181/backbeat

create /queue-populator

Create the kafka topics

backbeat-replication

kafka-topics --create \
--zookeeper localhost:2181/backbeat \
--replication-factor 1 \
--partitions 1 \
--topic backbeat-replication

backbeat-replication-status

kafka-topics --create \
--zookeeper localhost:2181/backbeat \
--replication-factor 1 \
--partitions 1 \
--topic backbeat-replication-status

backbeat-replication-failed

kafka-topics --create \
--zookeeper localhost:2181/backbeat \
--replication-factor 1 \
--partitions 1 \
--topic backbeat-replication-failed

Vault

git clone https://github.com/scality/Vault ~/replication/vault && \
cd ~/replication/vault && \
yarn i

Run vault with "in-memory backend"

chmod 400 ./tests/utils/keyfile

VAULT_DB_BACKEND="MEMORY" yarn start

⚠️ with "in-memory backend", all data is lost after you stop the process.

or with a "mongodb backend"

chmod 400 ./tests/utils/keyfile

VAULT_DB_BACKEND="MONGODB" yarn start

mongodb can be installed follwing these steps

CloudServer

git clone https://github.com/scality/cloudserver ~/replication/cloudserver && \
cd ~/replication/cloudserver && \
yarn i

Generate AWS access/secret key with full IAM and S3 access.

Add your keys aws configure --profile aws-account

Create AWS destination versioning-enabled bucket.

aws s3api create-bucket --bucket <DESTINATION_BUCKET_NAME> --profile aws-account

aws s3api put-bucket-versioning \
--bucket <DESTINATION_BUCKET_NAME> \
--versioning-configuration Status=Enabled \
--profile aws-account

Replace existing ./locationConfig.json with:

{
    "us-east-1": {
      "details": {
        "supportsVersioning": true
      },
      "isTransient": false,
      "legacyAwsBehavior": false,
      "objectId": "0b1d9226-a694-11eb-bc21-baec55d199cd",
      "type": "file"
    },
    "aws-location": {
        "type": "aws_s3",
        "legacyAwsBehavior": true,
        "details": {
            "awsEndpoint": "s3.amazonaws.com",
            "bucketName": "<DESTINATION_BUCKET_NAME>",
            "bucketMatch": false,
            "credentialsProfile": "aws-account",
            "serverSideEncryption": true
        }
    }
}

Update ./config.json with

"replicationEndpoints": [{ "site": "aws-location", "type": "aws_s3" }],

In ./config.json, make sure recordLog.enabled is set to true

"recordLog": {
        "enabled": true,
        ...
}

Run Cloudserver

S3DATA=multiple S3METADATA=mongodb REMOTE_MANAGEMENT_DISABLE=true \
S3VAULT=scality yarn start

Vaultclient

Create a "Zenko" account and generate keys

bin/vaultclient create-account --name bart --email dev@backbeat --port 8600
bin/vaultclient generate-account-access-key --name bart --port 8600
aws configure --profile bart

Backbeat

git clone https://github.com/scality/backbeat ~/replication/backbeat && \
cd ~/replication/backbeat && \
yarn i

Update conf/authdata.json with bart informations and keys.

{
    "accounts": [{
        "name": "bart",
        "arn": "aws:iam::331457510670:/bart",
        "canonicalID": "2083781e15384e30f48c651a948ec2dc1e1801c4af24c2750a166823e28ca570",
        "displayName": "bart",
        "keys": {
            "access": "20TNCD06HOCSLQSABFZP",
            "secret": "1P43SL0ekJjXnQvliV0KgMibZ=N2lKZO4dpnWzbF"
        }
    }
    ]
}

Update conf/config.json section extensions.replication.source.auth

"auth": {
    "type": "account",
    "account": "bart",
    "vault": {
        "host": "127.0.0.1",
        "port": 8500,
        "adminPort": 8600
    }
}

Make sure conf/config.json section extensions.replication.destination.bootstrapList includes:

{ "site": "aws-location", "type": "aws_s3" }

Queue populator

S3_REPLICATION_METRICS_PROBE=true REMOTE_MANAGEMENT_DISABLE=true \
yarn run queue_populator

Queue processor

S3_REPLICATION_METRICS_PROBE=true REMOTE_MANAGEMENT_DISABLE=true \
yarn run queue_processor aws-location

Replication status processor

S3_REPLICATION_METRICS_PROBE=true REMOTE_MANAGEMENT_DISABLE=true \
yarn run replication_status_processor

AWS S3 CLI

Create a source bucket with versioning enabled:

aws s3api create-bucket \
--bucket sourcebucket \
--endpoint-url http://127.0.0.1:8000 \
--profile bart

aws s3api put-bucket-versioning \
--bucket sourcebucket \
--versioning-configuration Status=Enabled \
--endpoint-url=http://127.0.0.1:8000 \
--profile bart

Set up replication

Create replication.json

{
    "Role": "arn:aws:iam::root:role/s3-replication-role",
    "Rules": [
        {
            "Status": "Enabled",
            "Prefix": "",
            "Destination": {
                "Bucket": "arn:aws:s3:::sourcebucket",
                "StorageClass": "aws-location"
            }
        }
    ]
}

aws s3api put-bucket-replication \
--bucket sourcebucket \
--replication-configuration file://replication.json \
--endpoint-url=http://127.0.0.1:8000 \
--profile bart

Put object to be replicated

aws s3api put-object \
--key key0 \
--body file \
--bucket sourcebucket \
--endpoint-url=http://127.0.0.1:8000 \
--profile bart

Check that object has been replicated

aws s3api head-object \
--key bucketsource/key0 \
--bucket <DESTINATION_BUCKET_NAME> \
--profile aws-account

Structure

In our $HOME directory, we now have the following directories:

$HOME
├── kafka
│   └── kafka_2.11-0.11.0.0
├── replication
    ├── backbeat
    ├── cloudserver
    └── vault

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