minio/docs/federation/lookup

Federation

There are primarily two types of federation

• Bucket lookup from DNS
• Bucket is shared across many clusters

This document will explain about how to configure Minio to support Bucket lookup from DNS style federation.

Federation (Bucket Lookup)

Bucket lookup federation requires two dependencies

• etcd (for config, bucket SRV records)
• coredns (for DNS management based on populated bucket SRV records)

Architecture

Run Multiple Clusters

cluster1

export MINIO_ETCD_ENDPOINTS="http://remote-etcd1:2379,http://remote-etcd2:4001"
export MINIO_DOMAIN=domain.com
export MINIO_PUBLIC_IP=44.35.2.1
minio server http://rack{1...4}.host{1...4}.domain.com/mnt/export{1...32}

cluster2

export MINIO_ETCD_ENDPOINTS="http://remote-etcd1:2379,http://remote-etcd2:4001"
export MINIO_DOMAIN=domain.com
export MINIO_PUBLIC_IP=44.35.2.2
minio server http://rack{5...8}.host{5...8}.domain.com/mnt/export{1...32}

In this configuration you can see MINIO_ETCD_ENDPOINTS points to the etcd backend which manages Minio's config.json and bucket DNS SRV records. MINIO_DOMAIN indicates the domain suffix for the bucket which will be used to resolve bucket through DNS. For example if you have a bucket such as mybucket, the client can use now mybucket.domain.com to directly resolve itself to the right cluster. MINIO_PUBLIC_IP points to the public IP address where each cluster might be accessible, this is unique for each cluster.

NOTE: mybucket only exists on one cluster either cluster1 or cluster2 this is random and is decided by how domain.com gets resolved, if there is a round-robin DNS on domain.com then it is randomized which cluster might provision the bucket.

TODO: For now the control to create the bucket from a client to the right cluster using region parameter is not implemented yet.