A, MongoDB Introduction

MongoDB is a distributed file storage based database. Written by C ++ language. Designed to provide scalable, high-performance data storage solution for WEB applications.

MongoDB is a product with function between relational databases and non-relational databases, non-relational database functions among the richest, most relational database like.

MongoDB the data is stored as a document data structure of the key (key => value) pairs. MongoDB document similar to JSON object. Field value can contain other documents, arrays and array of documents.

Second, the main features

MongoDB is a document-oriented database that stores operate more simple and easy.
Any attribute can be provided in the recording MongoDB index (eg: FirstName = "Sameer", Address = "8 Gandhi Road") to achieve faster sorting.
Image data can be created locally or through a network, which makes it stronger MongoDB scalability.
If the load increases (requires more storage space and more processing power), it can be distributed in a computer network on a different node This is called fragmentation.
Mongo supports a rich query expressions. JSON query instruction using the form tag can easily query document embedded objects and arrays.
MongoDb using update () command to implement the document (data) or complete replacement of some of the specified data fields.
Map / reduce Mongodb it is mainly used for data processing and batch polymerization operations.
Map and Reduce. Map function call EMIT (key, value) through all of the record set, and the key value passed to Reduce function processing.
Map and Reduce functions are functions written using Javascript, and MapReduce operation can be performed by db.runCommand or mapreduce command.
GridFS is a built-in feature in MongoDB can be used to store a large number of small files.
MongoDB allows the server to execute the script, you can use Javascript to write a function, execute directly on the server, you can put the function definitions are stored in the server, you can directly call the next time.
MongoDB supports a variety of programming languages: RUBY, PYTHON, JAVA, C ++, PHP, C # and other languages.
Easy to install MongoDB

Three, MongoDB deployment

1, the installation required dependencies

yum install libcurl openssl

2. Download Source Package

Download: HTTPS: // www.mongodb.com/download-center?jmp=nav#community

3, create the required directories

mkdir -p /app/mongodb4.0/{install,logs,conf,data}

4, upload unpack mongodb-linux-x86_64-4.0.0.tgz to /app/mongodb4.0/install directory

tar xf mongodb-linux-x86_64-4.0.0.tgz -C /app/mongodb4.0/install/

5, create MongoDB configuration files, log files

touch /app/mongodb4.0/logs/mongodb.log
touch /app/mongodb4.0/conf/mongodb.conf

6, edit mongodb.conf

port=27017
fork=true
logpath=/app/mongodb4.0/logs/mongodb.log
#logappen=true
dbpath=/app/mongodb4.0/data
auth=false

7, start MongoDB

/app/mongodb4.0/install/bin/mongod -f /app/mongodb4.0/conf/mongodb.conf

8, configure MongoDB

① into the MongoDB command mode

/app/mongodb4.0/install/bin/mongo 127.0.0.1:27017

② create a database

use demon

③ create a user administrator

Add a user with userAdminAnyDatabase role in the admin database

use admin

db.createUser({user:"admin",pwd:"admin",roles:[{role:"readWrite",db:"demon"}]});

db.createUser({user:"admin",pwd:"admin",roles:[{role:"readWriteAnyDatabase",db:"demon"}]});

9, stop MongoDB

/app/mongodb4.0/install/bin/mongod -f /app/mongodb4.0/conf/mongodb.conf -shutdown

10, edited mongodb.conf auth = true

/app/mongodb4.0/install/bin/mongod -f /app/mongodb4.0/conf/mongodb.conf

11, using the above created user login MongoDB

/app/mongodb4.0/install/bin/mongo --port 27017 -u "admin" -p "admin" --authenticationDatabase "admin"

Fourth, the development of MongoDB startup script

1, scripting

#!/bin/bash
# chkconfig: - 98 21
Mongod_Path="/app/mongodb4.0/install/bin/mongod"
Mongod_Conf="/app/mongodb4.0/conf/mongodb.conf"

usage() {
    echo "usage: $0 [start|stop|restart]"
}


start_Mongod() {
   $Mongod_Path -f $Mongod_Conf
   echo "Mongodb is starting"
}

stop_Mongod() {
   $Mongod_Path -f $Mongod_Conf --shutdown
   echo "Mongodb is stopped"
}


main() {
case $1 in
    start)
         start_Mongod;;
    stop)
         stop_Mongod;;
    restart)
         stop_Mongod && start_Mongod;;
    *)
         usage;
esac
}
main $1

2, grant script executable permissions

chmod +x /etc/init.d/mongod
chkconfig --add mongod

3, start, stop, re MongoDB service

/etc/init.d/mongod start
/etc/init.d/mongod stop
/etc/init.d/mongod restart

Fifth, the MongoDB database related operations

> Show dbs; # view the database under the current instance
> show databases; #-compliant relational database MySQL command
> use local; # switch databases local
> Show the Collections; # to view the collection database local of
> show tables; #-compliant relational database MySQL command
operation used is as follows:

linux operation and maintenance, road -MongoDB standalone deployment architecture