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Multi Data Center Replication

Configuration

LeoFS provides the multi data center replication related configuration items, which contain leo_manager_0.conf. Modify those configuration items to work its feature correctly.

LeoManager Master's Configuration For MDCR

Item Description
mdc_replication.num_of_replicas_a_dc A remote cluster of a LeoFS system which receives this cluster's objects, and then replicates them, which adhere to a replication method of each object
mdc_replication.consistency.write A number of replicas needed for a successful WRITE-operation
mdc_replication.consistency.read A number of replicas needed for a successful READ-operation
mdc_replication.consistency.delete A number of replicas needed for a successful DELETE-operation

How To Operate Multi Data Center Replication

Commands

There are three commands, join-cluster, remove-cluster, and cluster-status. You can control the multi data center repliation by LeoFS' CUI, leofs-adm.

Command Description
join-cluster <RMM> <RMS> Begin to communicate between the local cluster and the remote cluster
remove-cluster <RMM> <RMS> Terminate to communicate between the local cluster and the remote cluster
cluster-status See the current state of cluster(s)
  • RMM: A Remote cluster's LeoMnager-Master
  • RMS: A Remote cluster's LeoManager-Slave

join-cluster

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$ leofs-adm join-cluster [email protected]:13095 [email protected]:13096
OK

remove-cluster

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$ leofs-adm remove-cluster [email protected]:13095 [email protected]:13096
OK

cluster-status

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$ leofs-adm cluster-status
cluster id |   dc id    |    status    | # of storages  |          updated at
-----------+------------+--------------+----------------+-----------------------------
leofs_2    | dc_2       | running      |              3 | 2017-04-26 10:23:59 +0900