Redis study notes (Redis understanding, installation, startup, command line client, graphical interface)

Table of contents

Getting to know Redis

• Know NOSQL
• Meet Redis
• Install Redis

Redis common commands

• 5 Common Data Structures
• common command
• Operation commands for different data structures

Java client for Redis

• Jedis client
• Spring Data Redis client

Know NOSQL

Know NoSQL

	SQL	NoSQL
data structure	Structured	unstructured
data association	Relational	unrelated
inquiry mode	SQL query	non-SQL
transaction characteristics	ACID	BASE
storage method	disk	Memory
Scalability	vertical	level
scenes to be used	1) The data structure is fixed 2) Related businesses have high requirements for data security and consistency	1) The data structure is not fixed 2) The requirements for consistency and security are not high 3) The performance requirements

NoSQL unstructured includes:

1. Key-value type (Redis)
2. Document Type (MongoDB)
3. Column type (HBase)
4. Graph type (Neo4j)

Meet Redis

Redis was born in 2009 and its full name is Remote Dictionary Server. The remote dictionary server is a memory-based key-value NoSQL database.
feature:

• Key-value (key-value) type, value supports a variety of different data structures, rich in functions
• Single thread, each command is atomic
• Low latency, fast (memory based, IO multiplexing, good encoding).
• Support data persistence
• Support master-slave cluster and shard cluster
• Support multilingual clients

Getting to know Redis-Three ways to install Redis and start it

Most enterprises deploy projects based on Linux servers, and Redis does not officially provide a Windows version of the installation package. So the following uses the Linux system to install Redis.

Redis official website address: http://redis.io/

Download the redis installation package from the official website

1. Install Redis on a single machine

1.1 Install Redis dependencies

Redis is written based on C language, so you first need to install the gcc dependencies required by Redis:

yum indtall -y gcc tcl

1.2 Upload the installation package and decompress it

Upload the Redis installation package to any directory of the virtual machine, for example, into the /usr/local/src directory:

unzip:

tar -zxvf  redis-6.2.6.tar.gz

After decompression:

enter the redis directory:

cd redis-6.2.6

Run the compile command:

make && make install

If there are no errors, the installation was successful.

The default installation path is under the /usr/local/bin directory

This directory has been configured as an environment variable by default, so these commands can be run in any directory. in:

• redis-cli: is the command line client provided by redis
• redis-server: is the server-side startup script of redis
• redis-sentinel: is the redis sentinel startup script

1.3 start

There are many ways to start redis, for example:

• start by default
• Specify the configuration to start
• boot up

1.3.1 Start by default

After the installation is complete, enter the redis-server command in any directory to start Redis:

redis-server

This kind of startup belongs to the foreground startup, which will block the entire session window, and Redis will stop when the window is closed or CTRL+C is pressed. Not recommended.

1.3.2 Specify the configuration to start

If you want Redis to start in the background, you must modify the Redis configuration file, under the decompressed redis installation package (/usr/local/src/redis-6.2.6), the name is redis.conf:

Make a backup of this configuration file first:

cp redis.conf redis.conf.bck

Then modify some configurations in the redis.conf file:

# 监听的地址，默认是127.0.0.1，会导致只能在本地访问。修改为0.0.0.0则可以在任意IP访问，生产环境不要设置为0.0.0.0
bind 0.0.0.0
# 守护进程，修改为yes后即可后台运行
daemoonize yes
# 密码，设置后访问Redis必须输入密码
requirepass 123321

Other common configurations of Redis:

# 监听的端口
port 6379
# 工作目录，默认是当前目录，也就是运行redis-server时的命令、日志、持久化等文件会保存在这个目录
dir .
# 数据库数量，设置为1，代表只使用1个库，默认有16个库，编号0~15
databases 1
# 设置redis能够使用的最大内存
maxmemory 512mb
# 日志文件，默认为空，不记录日志，可以指定日志文件名
logfile “redis.log”

Start Redis:

# 进入redis安装目录
cd  /usr/local/src/redis-6.2.6
# 启动
redis-server redis.conf

Out of service:

# 利用redis-cli来执行 shutdown 命令，即可停止 Redis 服务
# 因为之前配置了密码，因此需要通过 -u 来指定密码
redis-cli -u 123321 shutdown

1.3.3 Startup automatically

We can configure it to start automatically at boot.
First, create a new system service file:

vi /etc/systemd/system/redis.service

The content is 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
PrivateTem=true

[Install]
WantedBy=multi-usr.target

Then reload the system service:

systemctl daemon-reload

Now, we can use the following set of commands to operate redis:

# 启动
systemctl start redis
# 停止
systemctl stop redis
# 重启
systemctl restart redis
# 查看状态
systemctl status redis

Execute the following command to make redis start automatically:

systemctl enable redis

Prohibit booting

systemctl disable redis

2. Redis client

After installing Redis, we can operate Redis to realize CRUD of data. Need to use Redis client, including:

• command line client
• Graphical desktop client
• programming client

2.1 Redis command line client

After the Redis installation is complete, it comes with a command line client: redis-cli, which can be used as follows:

redis-cli [options] [commonds]

Among the common options are:

• -h 127.0.0.1: Specify the IP address of the redis node to be connected, the default is 127.0.01
• -p 6379: Specify the port of the redis node to be connected, the default is 6379
• -a 123321: Specify the access password of redis

Among them, connonds is the operation command of Redis, for example:

• ping: Sit with the redis server for a heartbeat test, the server will return pong normally and
  if the commond is not specified, it will enter the interactive console of redis-cli:

2.2 Graphical desktop client

The graphical desktop client of Redis on Github, address: http://github.com/uglide/RedisDesktopManager
However, the warehouse provides the source code of RedisDesktopManager, and does not provide the windows installation package.

The installation package can be found in the following warehouse: http://github.com/lework/RedisDesktopManager-Windows/release

2.2.1 Installation

Redis graphical desktop client:

after decompression, run the installer to install:

after the installation is complete, find the rdm.exe file in the installation directory:

double-click to run