“This is the 11th day of my participation in the Gwen Challenge in November. See details: The Last Gwen Challenge in 2021”

Hi, family, I’m bug bug, here I go again. Let’s talk about something today. OK, let’s continue with the Ubuntu series. Listen and learn! Good cut?

I. Environmental description

Environment: Ubuntu20.04

Second, the preface

Redis is introduced:

I. Redis concept:

>> Redis:REmote DIctionary Server Is an in-memory cache database developed by Italian Salvatore Sanfilippo (online name: Antirez). Is a completely open source free, written in C language, comply with the BSD protocol, high performance (key/value) distributed memory database, memory based running and support persistence NoSQL database. For detailed concepts, please refer to Baidu encyclopedia.

Two, redis advantages:

>1. High scalability >2. Distributed computing >3. Low cost >4. Architectural flexibility, semi-structured data >5. No complicated relationship

Three, Redis shortcomings:

>1. No standardization >2. Limited query functionality (so far) >3. The final consensus is an unintuitive program

Four, redis classification:

type

Some representative

The characteristics of

Column storage

Hbase, Cassandra, Hypertable

As the name implies, data is stored in columns. The biggest feature is easy to store structured and semi-structured data, easy to do data compression, for a certain column or several columns of the query has a very large I/O advantage.

Document storage

Mongo, CouchDB

Documents are stored in a JSON-like format, and the content is document-like. This gives you the opportunity to index certain fields and implement some of the functionality of a relational database.

The key – value stored

Tokyo Abinet /Tyrant, BerkeleyDB, MemcacheDB, Redis

You can quickly query the value of the key. Generally, the store accepts the value regardless of the format. (Redis includes other features)

Figure storage

Tokyo Abinet /Tyrant, BerkeleyDB, MemcacheDB, Redis

Optimal storage of graphical relationships. Using traditional relational database to solve the low performance, and design is not convenient to use.

Object storage

Of those, Versant

Through the similar object-oriented language syntax operation database, through the way of objects access data.

XML database

BerkeleyDB、 XML、 BaseX

Store XML data efficiently and support XML internal query syntax such as XQuery and Xpath.

Five, Redis resources:

> 1. Redis website: Redis > 2. Redis online test: Try Redis > 3. Redis novice tutorial: | rookie Redis tutorial tutorial

Here, for xiaobai series of teaching, Bug bug has opened a special column, interested friends can pay attention to “Ubuntu Zero Basic Teaching”, Bug bug do so much just for one thing is to teach you, teaching will not charge tuition! For those who are helpful to you, please don’t forget to give a thumbs-up to bug bacteria. Your encouragement is the biggest support for me! So then, business as usual! The bugs are going to start class

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So then, business as usual! Bug bacteria will start the class oh ~ about Redis specific concepts and specific application scenarios, in fact, now say a little empty, later we will introduce Redis related to the characteristics of the time will be introduced in detail. Now let’s directly install (because the mainstream is to use Redis on the Linux server, very few on the Windows system, so I take the Linux version of Redis as an example to install).

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Redis installation:

#1. Get the latest software package

sudo apt update 
sudo apt install redis-server
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#2 after the installation, the Redis server will start automatically. Check whether Redis is started successfully

Sudo systemctl status redis-server or service redis-server statusCopy the code

Ps: As shown in the figure above: Active: Active (Running) : Redis is running and started successfully.

Redis process default port 6379

ps -aux|grep redis-server
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To verify this, listen on Redis port 6379:

ss -an | grep 6379
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#4. Set Redis to automatically start upon startup:

sudo systemctl enable redis-server.service
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#5. Configure Redis

Redis does not allow remote connections by default. You can only connect to the Redis server from 127.0.0.1 (localhost) – on the machine where the Redis server is running.

Open the Redis configuration file using the following command:

vi /etc/redis/redis.conf
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#5.1 Find the corresponding line and change it to the following:

#bind 0.0.0.0 ::1 // comment out this line protected-mode noCopy the code

Save this file and restart the Redis service for the application to take effect:

Sudo systemctl restart redis-server or sudo service redis-server restartCopy the code

#6. Disable the firewall. You can also whitelist port 6379 separately.

Ufw disable // Firewall disabled ufw enable // Firewall enabledCopy the code

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Install Redis server, automatically install Redis command line client program. Command line enter redis-cli

If the password is set 123456 redis-cli -a 123456

Redis -cli redis-cli -a 123456 // The redis password is setCopy the code

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The ps: Redis command is case insensitive

#8, attach common commands

To start the Redis service, run sudo systemctl start redis-server or service redis-server start to disable the Redis service. Run the following command to restart the redis service: sudo systemctl stop redis-server or service redis-server stop Sudo systemctl restart redis-server or service redis-server restartCopy the code

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In summary, it is the dry goods brought by bug bacteria this period, if not enough to eat, the bug bacteria think again ~~

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