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This article introduces the process of installing mongodb on Centos. The installation of software will definitely involve 32-bit and 64-bit. Since my system is 32-bit, I will use the 32-bit mongodb software here.

You can choose the corresponding software according to the situation of your machine

1. Install using source package

First download the source package of mongodb. For easy management, I created a new mongodb folder under the / directory and used the following command

$ mkdir –p /mongodb

Then type the following command in the Linux terminal

$ cd /mongodb

$ curl -O https://fastdl.mongodb.org/linux/mongodb-linux-i686-3.2.0.tgz

The directory where the downloaded software is stored is /mongodb. After downloading, unzip the software and use the following command

$ tar -zxvf mongodb-linux-i686-3.2.0.tgz

Unzip to the current directory, and then use the following command to adjust the directory structure

$ mv mongodb-linux-i686-3.2.0/* ./

The directory structure is as follows

Then delete the empty folder mongodb-linux-i686-3.2.0.

At this point, it can be said that mongodb has been installed.

Next you need to start the mongodb service.

Create a new /data/db folder to store data

$ mkdir –p /data/db

Then start the mongodb service (Note: before starting the service, you must ensure that /data/db has read and write permissions for the current user)

There is a mongod command under /mongodb/bin. This command can be used to start the service. The command is as follows

$ /mongodb/bin/mongod --dbpath /data/db

The following interface description appears

This indicates that the service has been successfully started, the listening port is 27017, and it is waiting for the client to connect.

The /mongodb/bin/mongod command above is a bit long. We can use # export PATH=/mongodb/bin:$PATH   to add the mongodb bin directory to the environment variable. The /mongodb/bin/mongod command above can be simplified to mongod.

The above is how to install mongodb using the source package.

2. Install using binary package

(Note: This method is written with reference to the official MongoDB tutorial. Since the official website does not provide 32-bit MongoDB, the 64-bit version is used for demonstration here.)

First, you need to create a yum source, create a new /etc/yum.repos.d/mongodb-org-3.2.repo file, and add the following content to the file

[mongodb-org-3.2]
name=MongoDB Repository
baseurl=https://repo.mongodb.org/yum/redhat/$releasever/mongodb-org/3.2/x86_64/
gpgcheck=0
enabled=1

After saving, you can use this yum source to install mongodb. Now start installing mongodb and its associated tools.

$ yum install –y mongodb-org

In addition, we can specify the corresponding version to install, and we can also specify the tools and versions of the tools associated with mongodb, as shown below

$ yum install -y mongodb-org-3.2.0 mongodb-org-server-3.2.0 mongodb-org-shell-3.2.0 mongodb-org-mongos-3.2.0 mongodb-org-tools-3.2.0

At this point, the mongodb installation is complete. Now start the mongodb service

Before starting the service, you must ensure that SELinux allows mongodb to be started. You can use the following command to achieve this effect.

$ setenforce 0

Finally, you can start, stop or restart the mongodb service through the following commands

$ service mongod start Start the service

$ service mongod stop Shut down the service

$ service mongod restart Restart the service

Note: By default, mongodb stores data files in /var/lib/mongo, log files in /var/log/mongodb, and the user is mongod. These can be set in /etc/mongod.conf.