![]() ![]() Shutdown a MongoDB instance Automate the process with Docker compose Note: The property force is optional it allows to force the shutdown. Once connected, run write the command to define the replica set configuration below: rsconf = ) Let's initiate the replica set by connecting to the first running instance: mongo -port 27021 On the three commands to launch each instance, the option replSet has the same value on all of them it is the name of the replica set: dbrs. Our three instances are running as illustrated in the picture below: Three running MongoDB instances ![]() Mongod -replSet dbrs -port 27023 -dbpath $HOME/mongo/data/db03 Mongod -replSet dbrs -port 27022 -dbpath $HOME/mongo/data/db02 Mongod -replSet dbrs -port 27021 -dbpath $HOME/mongo/data/db01 Open three terminals and run the command below to launch each instance: We will create them respectively on the port 27021, 27022, 27023. Ubuntu, Debian, Red Hat: /etc/nf Create a replica setĪs seen before, we need three running MongoDB instances. Once completed, we can continue with the steps below.īy default, a MongoDB instance runs on port 27017.įor Mac users, the configuration file is located here: Install MongoDBįollow the installation guide on the MongoDB website according to your operating system. In this tutorial, we will learn how to install MongoDB then create a replica set. It follows a specific structure where we have a first node called primary that receives the that then, these data are synced between the others node called secondary. In MongoDB, A replica set is a group of mongod processes that maintain the same data set. Replication prevents data loss since you always have a copy of your data somewhere it can be in the same physical server or distributed across many regions. Technically, if a node is down, we can forward the incoming requests to another node while making the previous one back to life. Replication is the process of creating multiple copies of the same data to increase the availability and stability. ![]()
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