Shulou(Shulou.com)06/01 Report--

Introduction to MongoDB:

1.MongoDB is an open source document database based on distributed file storage and the industry-leading NoSQL database written in C++.

two。 In the case of high load, adding more nodes can ensure server performance.

3.MongoDB is a product between relational database and non-relational database. The main purpose of not using relational model is to obtain better expansibility. MongoDB no longer has the concept of row, and its operation mode is based on two concepts: collection and document.

4. MongoDB aims to provide scalable high-performance data storage solutions for WEB applications.

5.MongoDB stores the data as a document, and the data structure consists of key-value (key= > value) pairs. MongoDB documents are similar to JSON objects. Field values can contain other documents, arrays, and document arrays.

Main features:

1.MongoDB is easy to install, provides document-oriented storage function, and is easy to operate.

2.MongoDB provides replication, high availability, and automatic sharding. If the load increases (more storage space and more processing power are needed), it can be distributed among other nodes in the computer network, which is called sharding.

3.MongoDB supports rich query expressions, and query instructions use tags in the form of JSON to easily query objects and arrays embedded in documents.

4.MongoDB supports a variety of programming languages: Ruby, Python, Java, C++, PHP, C # and other languages.

5.MongoDB uses the update () command to replace the completed document (data) or some specified data fields.

Map/reduce in 6.MongoDB is mainly used for batch processing and aggregation of data.

Areas of application of MongoDB:

MongoDB can provide scalable high-performance data storage solutions for web applications. MongoDB is mainly applicable to website data, distributed scenarios, data caching and JSON document format storage. It is suitable for Internet applications with large amount of data, high concurrency and weak transactions. its built-in horizontal scaling mechanism provides data processing capacity from millions to billions, which can well meet the data storage requirements of web2.0 and mobile Internet applications.

Deploy and install MongoDB4.0:

Installation environment:

Operating system: CentOs 7

Software package: https://pan.baidu.com/s/1xI38QSzie6DK2UL7wQ6K9g

Turn off the firewall and Selinux

Installation process:

1. Install support packages

Yum-y install openssl-devel libcurl

two。 Copy the software package to the CentOs 7 root directory using the winscp tool

3. Extract the MongoDB software package

Tar zxvf mongodb-linux-x86_64-rhel70-4.0.0.tgz-C / opt

4. Rename and move directory to / usr/local/ directory

Mv / opt/mongodb-linux-x86_64-rhel70-4.0.0 / usr/local/mongodb

5. Create MongoDB's data storage directory, log storage directory and log files

Mkdir-p / data/mongodb/mongodb1

Mkdir-p / data/conf/

Mkdir-p / data/logs/

Touch / data/logs/mongodb1.log

Chmod-R 777 / data/logs/mongodb1.log

6. Adjust the settings of shell resources to prevent frequent access to MongoDB resulting in errors that result in failure to connect to MongoDB instances

Ulimit-n 25000 # maximum number of open files at a time

Ulimit-u 25000 # maximum number of programs opened at the same time

7. Create a configuration file (startup parameters)

Vim / data/conf/mongodb1.conf

The modifications are as follows:

# mongod.conf

# for documentation of all options, see:

# http://docs.mongodb.org/manual/reference/configuration-options/

# where to write logging data.

SystemLog:

Destination: file

LogAppend: true

Log file path of path: / data/logs/mongodb1.log / / mongodb1

# Where and how to store data.

Storage:

Data file path of dbPath: / data/mongodb/mongodb1/ mongodb1

Journal:

Enabled: true

# engine:

# mmapv1:

# wiredTiger:

# how the process runs

ProcessManagement:

Fork: true # fork and run in background

PidFilePath: / data/mongodb/mongodb1/mongod.pid # location of pidfile

TimeZoneInfo: / usr/share/zoneinfo

# network interfaces

Net:

Port: 27017 / / process number of mongodb1

BindIp: 0.0.0.0 # Listen to local interface only, comment to listen on all interfaces.

# security:

# operationProfiling:

Replication: / / Delete "#" and enable replication set function

ReplSetName: test-rc / / name is test-rc

# sharding:

# # Enterprise-Only Options

# auditLog:

# snmp:

8. Set kernel parameters (when one node runs out of available memory, the system allocates memory from other nodes)

Echo 0 > / proc/sys/vm/zone_reclaim_mode

Sysctl-w vm.zone_reclaim_mode=0

Echo never > / sys/kernel/mm/transparent_hugepage/enabled

Echo never > / sys/kernel/mm/transparent_hugepage/defrag

The executable file for 9.MongoDB is located in the bin directory, so you can add it to the PATH path:

Vim / etc/profile

Append the following statement to the end of the file

Export PATH=/usr/local/mongodb/bin:$PATH\

Then reload the environment variables:

Source / etc/profile

10. Set MongoDB Boot self-boot

Vim / etc/rc.local

Rm-rf / data/mongodb/mongodb1/mongod.lock

/ usr/local/mongodb/bin/mongod-f / data/conf/mongodb1.conf / / start the instance

11. Start the MongoDB database

Mongod-f / data/conf/mongodb1.conf

twelve。 Check the MongoDB process

Netstat-tunlp | grep mongod

13. Shut down the MongoDB database

Mongod-f / data/conf/mongodb1.conf-- shutdown

14. Local client connects and accesses MongoDB database (default port: 27017)

Enter directly with the command mongo

It's over!

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