Redis-01. First meet redis

NoSQL

SQL and NoSQL The difference between

	SQL	NoSQL
data structure	structured	Unstructured （ Key value 、 file 、 Column 、 Map, etc. ） The structure is loose
Data Association	The associated	Unrelated
A query	SQL Inquire about	Not SQL
Transaction features	ACID	BASE
storage	disk	Memory
Extensibility	vertical	level
Use scenarios	1） The data structure is fixed 2） For data security 、 High consistency is required	1） The data structure is not fixed 2） For consistency 、 Safety requirements are not high 3） Performance requirements

Redis

features ：

• Key value type ,value Support a variety of different data structures
• Single thread , Every command is atomic
• Low latency , Fast （ Memory based 、IO Multiplexing 、 Good coding ）
• Support data persistence
• Support the master-slave cluster 、 Fragmentation cluster
• Support for multilingual clients

1. install Redis

1. install Redis rely on

Redis be based on C Language implementation , So first install gcc rely on

yum install -y gcc tcl

2. Upload the installation package and unzip it

Upload Redis Installation package to /usr/local/src

Decompress after entering this path

tar -xzf redis-6.2.6.tar.gz

After decompression, enter the decompression path

cd redis-6.2.6

Run the compile command ：

make && make install

After successful operation , Just install it

The default installation path is /usr/local/bin/

This directory and the default configuration to the environment variable , Therefore, you can run these commands in any directory . among ：

• redis-cli： yes redis The command line client provided
• redis-server： yes redis Server startup script
• redis-sentinel： yes redis Sentinel startup script

3. start-up

redis There are many ways to start , for example ：

• The default startup
• Specify the configuration to start
• Boot from boot

1. The default startup

After installation , Enter... In any directory redis-server Command to start Redis：

redis-server

This startup belongs to The front desk starts , Will block the entire session window , Close the window or press CTRL + C be Redis stop it . It is not recommended to use .

2. Specify the configuration to start

If you want to make Redis With backstage Mode start , You have to modify Redis The configuration file , Just before we unzipped redis Under the installation package （/usr/local/src/redis-6.2.6）, Name is redis.conf

First, back up this configuration file ：

cp redis.conf redis.conf.bck

Modify the configuration file

vi redis.conf

And then modify redis.conf Some configurations in the file ：

#  Address allowed to access , The default is 127.0.0.1, Will result in local access only . It is amended as follows 0.0.0.0 It can be in any IP visit , The production environment should not be set to 0.0.0.0
bind 0.0.0.0
#  Daemon , It is amended as follows yes After, it can run in the background 
daemonize yes 
#  password , Access after setting Redis You must enter a password 
requirepass redispasswd

Redis Other common configurations ：

#  Listening port 
port 6379
#  working directory , The default is the current directory , Which is running redis-server When the command , journal 、 Files such as persistence will be saved in this directory 
dir .
#  Number of databases , Set to 1, Stands for using only 1 Databases , The default is 16 Databases , Number 0~15
databases 1
#  Set up redis Maximum memory available 
maxmemory 512mb
#  Log files , The default is empty. , Do not log , You can specify the log file name 
logfile "redis.log"

start-up Redis：

#  Get into redis The installation directory  
cd /usr/local/src/redis-6.2.6
#  start-up 
redis-server redis.conf

Out of Service ：

#  utilize redis-cli To execute  shutdown  command , Just stop  Redis  service ,
#  Because the password was configured before , So it needs to pass  -a  To specify the password 
redis-cli -a 123321 shutdown

3. Boot from boot

We can also realize self startup through configuration .

First , Create a new system service file ：

vi /etc/systemd/system/redis.service

The contents are as follows ：

[Unit]
Description=redis-server
After=network.target

[Service]
Type=forking
ExecStart=/usr/local/bin/redis-server /usr/local/src/redis-6.2.6/redis.conf
PrivateTmp=true

[Install]
WantedBy=multi-user.target

Then reload the system services ：

systemctl daemon-reload

Now? , We can use the following set of commands to operate redis 了 ：

#  start-up 
systemctl start redis
#  stop it 
systemctl stop redis
#  restart 
systemctl restart redis
#  Check the status 
systemctl status redis

Execute the following command , It can make redis Boot from boot ：

systemctl enable redis

2.Redis client

installation is complete Redis, We can operate Redis, To achieve data CRUD 了 . It needs to use Redis client , Include ：

• Command line client
• Graphical desktop client
• Programming client

1.Redis Command line client

Redis After the installation is completed, the command-line client comes with it ：redis-cli, Use as follows ：

redis-cli [options] [commonds]

One of the common ones is options Yes ：

• -h 127.0.0.1： Specify the... To connect to redis Node IP Address , The default is 127.0.0.1
• -p 6379： Specify the... To connect to redis Port of node , The default is 6379
• -a 123321： Appoint redis Access code for

Among them commonds Namely Redis Operation command of , for example ：

• ping： And redis The server does a heartbeat test , The server will normally return pong

Don't specify commond when , Will enter redis-cli Interactive console

First start redis client

redis-cli

Then enter the password

auth "123321"

ping once

ping

ping If successful, it will return a pong

have access to set Store the data in the database in the form of a dictionary

2. Graphical desktop client

Installation package warehouse ：https://github.com/lework/RedisDesktopManager-Windows/releases

Source code ：https://github.com/uglide/RedisDesktopManager

According to myself redis You can connect by setting the configuration of

You can find , Deposited before redis The data of was successfully saved in redis In the database of

Reference material ：

1. https://www.bilibili.com/video/BV1cr4y1671t?p=7&spm_id_from=pageDriver
2. https://blog.csdn.net/Mr_wangB0/article/details/102741624
3. https://blog.csdn.net/qq_26710805/article/details/80171101