Replication Reference

Replication Methods in the mongo Shell

Name	Description
`rs.add()`	Adds a member to a replica set.
`rs.addArb()`	Adds an arbiter to a replica set.
`rs.conf()`	Returns the replica set configuration document.
`rs.freeze()`	Prevents the current member from seeking election as primary for a period of time.
`rs.help()`	Returns basic help text for replica set functions.
`rs.initiate()`	Initializes a new replica set.
`rs.printReplicationInfo()`	Prints a report of the status of the replica set from the perspective of the primary.
`rs.printSlaveReplicationInfo()`	Prints a report of the status of the replica set from the perspective of the secondaries.
`rs.reconfig()`	Re-configures a replica set by applying a new replica set configuration object.
`rs.remove()`	Remove a member from a replica set.
`rs.slaveOk()`	Sets the `slaveOk` property for the current connection. Deprecated. Use `readPref()` and `Mongo.setReadPref()` to set read preference.
`rs.status()`	Returns a document with information about the state of the replica set.
`rs.stepDown()`	Causes the current primary to become a secondary which forces an election.
`rs.syncFrom()`	Sets the member that this replica set member will sync from, overriding the default sync target selection logic.

Name	Description
`applyOps`	Internal command that applies oplog entries to the current data set.
`isMaster`	Displays information about this member’s role in the replica set, including whether it is the master.
`replSetAbortPrimaryCatchUp`	Forces the elected primary to abort sync (catch up) then complete the transition to primary.
`replSetFreeze`	Prevents the current member from seeking election as primary for a period of time.
`replSetGetConfig`	Returns the replica set’s configuration object.
`replSetGetStatus`	Returns a document that reports on the status of the replica set.
`replSetInitiate`	Initializes a new replica set.
`replSetMaintenance`	Enables or disables a maintenance mode, which puts a secondary node in a `RECOVERING` state.
`replSetReconfig`	Applies a new configuration to an existing replica set.
`replSetResizeOplog`	Dynamically resizes the oplog for a replica set member. Available for WiredTiger storage engine only.
`replSetStepDown`	Forces the current primary to step down and become a secondary, forcing an election.
`replSetSyncFrom`	Explicitly override the default logic for selecting a member to replicate from.

Replica Set Configuration
Complete documentation of the replica set configurationobject returned by rs.conf().
Replica Set Protocol Version
Reference on the replica set protocol version.
Troubleshoot Replica Sets
Replica set trouble shooting guide.
The local Database
Complete documentation of the content of the local databasethat mongod instances use to support replication.
Replica Set Member States
Reference for the replica set member states.
Read Preference Reference
Complete documentation of the five read preference modes that theMongoDB drivers support.
Convert a Master-Slave Deployment to a Replica Set
Instructions to convert a master-slave deployment (no longersupported in 4.0) to a replica set.