IO • Stores sharding configuration • Stores small amounts of data • Infrequently queried/updated by MongoS • Stateless router • Typically run on App Servers • Can run as Arbiter • No data • Just votes to elect primary
rapid replica provisioning – Slightly more complicated to orchestrate Sming • LVM Snapshot (config+shards) • Use secondaries for zero downSme backups • h_p://www.mongodb.org/pages/viewpage.acSon? pageId=19562846
page) MongoD Shard Server 27018 MongoS 27017 ConfigDB 27019 • All nodes listen on all interfaces unless –bind_ip is specified • Specify alternate port with –port • Don’t mix names & IP’s. Names preferred (not ec2s) • Use security groups as access control lists • (e.g. allow 27017 from app servers, but not everybody)