mongodb is a database based on distributed file storage. Written in C++ language. The aim is to provide a scalable and high performance data storage solution for WEB applications.
MongoDB is a product between relational database and non-relational database, which has the most abundant functions and resembles relational database.

Install MongoDB

1. Create repo

vi /etc/yum.repos.d/mongodb-org-3.2.repo

[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  

2. Installing MongoDB and related tools

sudo yum install -y mongodb-org

3. Start MongoDB

4. Verify that MongoDB started successfully

cat /var/log/mongodb/mongod.log
Check if there is a sentence: [initandlisten] wait for connections on port < port >
Where < port > is configured in / etc/mongod.conf, port 27017 by default.
There is another way:

# sudo service mongod status  
Redirecting to /bin/systemctl status  mongod.service  
● mongod.service - High-performance, schema-free document-oriented database  
   Loaded: loaded (/usr/lib/systemd/system/mongod.service; disabled; vendor preset: disabled)  
   Active: active (running) since One 2016-09-12 09:50:16 CST; 15s ago  
  Process: 8787 ExecStart=/usr/bin/mongod $OPTIONS run (code=exited, status=0/SUCCESS)  
 Main PID: 8842 (mongod)  
   CGroup: /system.slice/mongod.service  
           └─8842 /usr/bin/mongod --quiet -f /etc/mongod.conf run  
  
9 Month 1209:50:13 192.168.1.155 systemd[1]: Starting High-performance, schema-free document-oriented database...  
9 Month 1209:50:14 192.168.1.155 mongod[8787]: about to fork child process, waiting until server is ready for connections.  
9 Month 1209:50:14 192.168.1.155 mongod[8787]: forked process: 8842  
9 Month 1209:50:16 192.168.1.155 mongod[8787]: child process started successfully, parent exiting  
9 Month 1209:50:16 192.168.1.155 systemd[1]: Started High-performance, schema-free document-oriented database. 

You will see "Active: active (running)" indicating that it is running.
Not in operation:

# sudo service mongod status  
Redirecting to /bin/systemctl status  mongod.service  
● mongod.service - High-performance, schema-free document-oriented database  
   Loaded: loaded (/usr/lib/systemd/system/mongod.service; disabled; vendor preset: disabled)  
   Active: inactive (dead)  

Active: inactive (dead)

5. Make MongoDB boot up automatically

sudo chkconfig mongod on

6. Stop MongoDB

sudo service mongod stop

7. Restart MongoDB

sudo service mongod restart

Enter the Mongo command line

# mongo  
MongoDB shell version: 2.6.12  
connecting to: test  
Welcome to the MongoDB shell.  
For interactive help, type "help".  
For more comprehensive documentation, see  
    http://docs.mongodb.org/  
Questions? Try the support group  
    http://groups.google.com/group/mongodb-user  
Server has startup warnings:   
2016-09-12T09:50:14.195+0800 [initandlisten]   
2016-09-12T09:50:14.195+0800 [initandlisten] ** WARNING: Readahead for /var/lib/mongodb is set to 4096KB  
2016-09-12T09:50:14.195+0800 [initandlisten] **          We suggest setting it to 256KB (512 sectors) or less  
2016-09-12T09:50:14.195+0800 [initandlisten] **          http://dochub.mongodb.org/core/readahead  
>   

MongoDB extension for installing PHP under Linux

Because MongoDB is manually installed, you also need to compile and install MongoDB extensions, as follows:
1) Download the latest PHP mongodb extension source code, the source code can be in http://pecl.php.net/package/mongo Download.

2) Unzip and enter the installation directory

wget http://pecl.php.net/get/mongo-1.4.0.tgz 
tar -zxvf mongo-1.4.0.tgz
cd mongo-1.4.0   

3) After entering the folder, first run phpize to compile the extended environment
/usr/bin/phpize

PHP Api Version: 20121113
Zend Module Api No: 20121212
Zend Extension Api No: 220121212

4) After running, we run the. / configure script to configure it.
`
./configure --with-php-config=/usr/local/php/bin/php-config && make && make install

The parameter with-php-config tells the configuration script the path of the program php-config

5) Upon completion, edit your [php](http://lib.csdn.net/base/php).ini file and add a line extension=mongo.so.`

The default INI file for compiling PHP / usr/local/php/etc/php.ini restarts Apache/Nginx [or / etc/init.d/php-fpm restart] opens phpinfo to see the mongo module, proving that mongodb The php extension was successfully installed.
OK, so you can use php to operate MongoDB