Software Engineer, 10gen

Craig Wilson

#MongoDBDays

Backup, Restore, and Disaster Recovery

You Gotta Back It UpTo Get It BackLeo Laporte

Even More ImportantRestoring It

Slightly Less, But Still Very ImportantPractice

Backups with MongoDB

• Not difficult– Multiple options– Choose the one that fits your needs

• Can be automated

• Practice

Choices

Choices

• Selectivity

• Live/Offline

• Efficiency

• Backup Size

• Environment Constraints

mongodump

• Dumps collections to *.bson files– Use bsondump to view these files

• Mirrors your structure

• Can be run in live or offline mode

• --dbpath for direct file access

• --oplog to dump oplog last PIT

• --query/filter selective dump

mongorestore

• Selected dbs, collections

• --oplogReplay

File System - fsync +lock• No more writes

• Copy the data files

• Remember to unlock

File System - Snapshot

• Snapshot– Journaling needs to be on– Journal needs to be on the same volume

File System

• Entire database

• Backup files will be large

• Fastest way to create a backup

• Fastest way to restore a backup

Disaster Recovery

Replica SetsDisaster Avoidance

Disaster Avoidance

• Redundancy

• Multiple Datacenters

• Multiple Regions

> rs.conf() { "_id" : "replSetName", "version" : 3, "members" : [ { "_id" : 0, "host" : "myhost1.dnsname.com:27017“, “tags” : { “dc” : “east” } }, { "_id" : 1, "host" : "myhost2.dnsname.com:27017“, “tags” : { “dc” : “east” } }, { "_id" : 2, "host" : "myhost3.dnsname.com:27017“, “tags” : { “dc” : “west” } }] }

Disaster Avoidance

Disaster Recovery Logistics• Recovery (restore) time

• Replacement– Machine– Component (disk, memory, etc)– Cluster

• Configuration (reconfiguration)

Sharded Systems

Sharded Systems

• No true point in time

1. Stop balancing – sh.stopBalancer()

2. Stop one config server (data R/O)

3. Backup Data (shards, config)

4. Restart config server

5. Resume Balancer

What have we discussed?

What have we discussed?• You have Options

• It’s not difficult

• Practice!

Software Engineer, 10gen

Craig Wilson

#MongoDBDays

Thank You