Book Image

Mastering MongoDB 3.x

By : Alex Giamas
Book Image

Mastering MongoDB 3.x

By: Alex Giamas

Overview of this book

MongoDB has grown to become the de facto NoSQL database with millions of users—from small startups to Fortune 500 companies. Addressing the limitations of SQL schema-based databases, MongoDB pioneered a shift of focus for DevOps and offered sharding and replication maintainable by DevOps teams. The book is based on MongoDB 3.x and covers topics ranging from database querying using the shell, built in drivers, and popular ODM mappers to more advanced topics such as sharding, high availability, and integration with big data sources. You will get an overview of MongoDB and how to play to its strengths, with relevant use cases. After that, you will learn how to query MongoDB effectively and make use of indexes as much as possible. The next part deals with the administration of MongoDB installations on-premise or in the cloud. We deal with database internals in the next section, explaining storage systems and how they can affect performance. The last section of this book deals with replication and MongoDB scaling, along with integration with heterogeneous data sources. By the end this book, you will be equipped with all the required industry skills and knowledge to become a certified MongoDB developer and administrator.
Table of Contents (13 chapters)

Setting up a replica set

In this section, we will go through the most common deployment procedures to set up a replica set.

Converting a standalone server to a replica set

To convert a standalone server to a replica set, we first need to cleanly shut down the mongo server:

> use admin
> db.shutdownServer()

Then we start the server with the --replSet configuration option via the command line or using a configuration file, as explained in the next section.

First, we connect via the mongo shell to the new replica set enabled instance as follows:

> rs.initiate()

Now, we have the first server of our replica set. We can add the other servers (which must have also been started with --replSet) by using the mongo shell as follows...