May 2013
Intermediate to advanced
430 pages
11h 2m
English
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Chapter 9. Setting Up a Replica Set
This chapter introduces MongoDB’s replication system: replica sets. It covers:
What replica sets are
How to set up a replica set
What configuration options are available for replica set members
Introduction to Replication
Since the first chapter, we’ve been using a standalone server, a single mongod server. It’s an easy way to get started but a dangerous way to run in production: what if your server crashes or becomes unavailable? Your database will at least be unavailable for a little while. If there are problems with the hardware, you may have to move your data to another machine. In the worst case, disk or network issues could leave you with corrupt or inaccessible data.
Replication is a way of keeping identical copies of your data on multiple servers and is recommended for all production deployments. Replication keeps your application running and your data safe, even if something happens to one or more of your servers.
With MongoDB, you set up replication by creating a replica set. A replica set is a group of servers with one primary, the server taking client requests, and multiple secondaries, servers that keep copies of the primary’s data. If the primary crashes, the secondaries can elect a new primary from amongst themselves.
If you are using replication and a server goes down, you can still access your data from the other servers in the set. If the data on a server is damaged or inaccessible, you can make a new copy of the data from one the other ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.