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What is MongoDb and how to install MongoDb

Before install MongoDB we have to know about it. MongoDB is an open-source document database with automatic scaling. it supports NoSQL high availability. It has high performance and written in c++ by Dwight Merriman and Eliot Horowitz. The creator of the Man who had encountered development and scalability issues with traditional relational database approaches while Continue Reading


Before install MongoDB we have to know about it. MongoDB is an open-source document database with automatic scaling. it supports NoSQL high availability. It has high performance and written in c++ by Dwight Merriman and Eliot Horowitz. The creator of the Man who had encountered development and scalability issues with traditional relational database approaches while building Web applications at DoubleClick, an Internet advertising company that is now owned by Google Inc.

MongoDB database uses JSON like document storage and data interchange format called BSON
BSON provides a binary representation of JSON-like documents.

Key Features

High Performance

High Availability

Automatic Scaling

A record in MongoDB is called document.The document is a data structure of field and value pairs.As MongoDB documents are like JSON objects. The values of fields may include other documents, arrays, and arrays of documents.

Install MongoDB

Import the public key used by the package management system.

The Ubuntu package management tools (i.e. dpkg and apt) ensure package consistency and authenticity by

requiring that distributors sign packages with GPG keys. To import the public GPG Key:

sudo apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv 7F0CEB10

Create a list file for MongoDB.

Create the /etc/apt/sources.list.d/mongodb-org-3.0.list list file using the command appropriate for your version of Ubuntu:

Ubuntu 12.04

echo "deb http://repo.mongodb.org/apt/ubuntu precise/mongodb-org/3.0 multiverse" | sudo tee /etc/apt/sources.list.d/mongodb-org-3.0.list

Ubuntu 14.04

echo "deb http://repo.mongodb.org/apt/ubuntu trusty/mongodb-org/3.0 multiverse" | sudo tee /etc/apt/sources.list.d/mongodb-org-3.0.list

Reload local package database.

Issue the following command to reload the local package database:

sudo apt-get update

Install MongoDB packages.

You can install either the latest stable version of MongoDB or a specific version of it.

Install the latest stable version.

Issue the following command:

sudo apt-get install -y mongodb-org

Install MongoDB a specific release.

To install a specific release, you must specify each component package individually along with the version number, as in the following example:

sudo apt-get install -y mongodb-org=3.0.15 mongodb-org-server=3.0.15 mongodb-org-shell=3.0.15 mongodb-org-mongos=3.0.15 mongodb-org-tools=3.0.15

If you only install mongodb-org=3.0.15 and do not include the component packages, the latest version of each MongoDB package will be installed regardless of what version you specified.

Pin a specific version.

Although you can specify any available version of MongoDB, apt-get will upgrade the packages when a newer version becomes available. To prevent unintended upgrades, pin the package. To pin the version of it at the currently installed version, issue the following command sequence:

echo "mongodb-org hold" | sudo dpkg --set-selections
echo "mongodb-org-server hold" | sudo dpkg --set-selections
echo "mongodb-org-shell hold" | sudo dpkg --set-selections
echo "mongodb-org-mongos hold" | sudo dpkg --set-selections
echo "mongodb-org-tools hold" | sudo dpkg --set-selections

Versions of the MongoDB packages before 2.6 use a different repository location. Refer to the version of the documentation appropriate for your MongoDB version.

Run MongoDB

The MongoDB instance stores its data files in /var/lib/mongodb and its log files in /var/log/mongodbby default, and runs using the mongodb user account. You can specify alternate log and data file directories in /etc/mongod.conf. See systemLog.path and storage.dbPath for additional information.

If you change the user that runs the MongoDB process, you must modify the access control rights to the /var/lib/mongodb and /var/log/mongodb directories to give this user access to these directories.

Start MongoDB.

Use the following command to start :

sudo service mongod start

Verify that MongoDB has started successfully

Verify that the mongod process has started successfully by checking the contents of the log file at/var/log/mongodb/mongod.log for a line reading

[initandlisten] waiting for connections on port <port>

where <port> is the port configured in /etc/mongod.conf, 27017 by default.

Stop .

As needed, you can stop the mongod process by issuing the following command:

sudo service mongod stop

Restart.

Issue the following command to restart mongod:

sudo service mongod restart

Begin using .

To help you start using MongoDB, MongoDB provides Getting Started Guides in various driver editions. See Getting Started for the available editions.

Before deploying MongoDB in a production environment, consider the Production Notes document.

Later, to stop, press Control+C in the terminal where the instance is running.

Uninstall

To completely remove MongoDB from a system, you must remove the applications themselves, the configuration files, and any directories containing data and logs. The following section guides you through the necessary steps.

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About the author

Joydeb Choudhury holds a Master's degree in Computer Application from I.G.N.O.U. After working as a web developer in various companies he has started bloging in 2016.

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