MongoDB replica set
A MongoDB replica set is a group of server instances maintaining synchronized data copies, with an elected primary for writes and automatic failover.
MongoDB 8.0 in Action, Third Edition
A replica set is a group of database servers that maintain replicated copies of data with automatic primary election for availability.
- How it is used
- Provides redundant data copies and primary failover, including within shards and config servers in a sharded cluster.
- How deep it goes
- Defines members and their roles, then identifies election voting and the oplog without walking through replica-set configuration commands.
- Examples
- Illustrates failover when a shard primary fails and diagrams shards and config servers as replica sets.
- What you can do after
- Evaluate/understand when replication improves availability and read capacity, and when sharding is needed to address write bottlenecks.
Read how MongoDB 8.0 in Action, Third Edition explains MongoDB replica set →
Kubernetes in Action, Second Edition
A MongoDB replica set is a group of MongoDB server instances that maintain replicated data and designate a primary for write operations.
- How it is used
- Deploys replicated MongoDB as a stateful Kubernetes workload with per-replica storage, identity, and initialization.
- How deep it goes
- Explains storage and addressing requirements, StatefulSet artifacts, initialization, readiness failures, and inspection commands.
- Examples
- Uses a three-pod quiz deployment, per-pod claims, stable DNS names, and an rs.initiate command.
- What you can do after
- Operate/configure a three-member replica set with kubectl, mongosh, stable Services, and per-pod persistent claims.
Read how Kubernetes in Action, Second Edition explains MongoDB replica set →
Related concepts
- read preferenceconfigured by · Read preference is a database-client policy specifying which replica roles or locations may serve read operations.
- Kubernetes operatorconfigured by · A Kubernetes operator is a controller pattern that extends Kubernetes to automate application or service management by reconciling desired and actual state through the Kubernetes API.
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