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Technical Articles

Database

Redis

How to implement Redis stand-alone installation and sentinel mode cluster installation

1. Installation of Redis stand-alone version 1.1: Download the installation package cd/usr/local/src/wgethttps://download.redis.io/releases/redis-5.0.13.tar.gz to see redis-5.0.13.tar. gz file indicates that the download is successful 1.2: Decompress the installation package tar-zxvfredis-5.0.13.tar.gz. After decompression is completed, enter the decompressed folder and you will see the following file content cdredis-5.0.13ll-rw-rw-r --.1rootroot125833Jul2202:0700-RELEASEN

May 27, 2023 pm 11:16 PM

redis

How to use Go+Redis to implement common current limiting algorithms

Fixed window It is relatively simple to implement a fixed window using Redis, mainly because there will only be one window in the fixed window at the same time, so we can use the pexpire command to set the expiration time to the window time when entering the window for the first time, so that the window will change with the expiration time. Invalid, and we use the incr command to increase the window count. Because we need to set the expiration time of the window when counter==1, in order to ensure atomicity, we use a simple Lua script to implement it. constfixedWindowLimiterTryAcquireRedisScript=`--ARGV[1]: window time size--ARGV[2]: window request upper limit loca

May 27, 2023 pm 11:16 PM

Go redis

How to use Redis to implement the like function

Advantages and Disadvantages of MySQL and Redis First, let's talk about the advantages and disadvantages of the two methods: Let's take MySQL and Redis as examples. 1. Directly write to the database: Advantages: This method is simple to implement, and only needs to complete the addition, deletion, modification and query of the database; Disadvantages: The database is under great pressure to read and write. If a popular article receives a large number of likes in a short period of time, directly Operating the database will put huge pressure on the database and affect efficiency. 2. Use Redis cache: Advantages: high performance, fast reading and writing speed, alleviating the pressure of database reading and writing; Disadvantages: complex development, data security cannot be guaranteed, that is, data will be lost when redis hangs up, and the data in redis will not be synchronized in time. Data may be stolen during redis memory replacement

May 27, 2023 pm 10:37 PM

redis

How to renew Redis distributed lock

How to renew the Redis distributed lock? The correct posture of the Redis distributed lock. According to Fei Chao, when many students use distributed locks, they directly search on Baidu to find a Redis distributed lock tool class and use it directly. The key is this tool The class is also filled with many System.out.println(); and other statements. In fact, the more correct approach to Redis distributed lock is to use the client tool redisson. For specific introduction, you can search the largest gay dating website github. How to answer first if you If you used Redis' distributed locks correctly before and read the corresponding official documents, this problem is easy. Let's take a look at it. Frankly speaking, if your English is great, then read the English documents.

May 27, 2023 pm 10:26 PM

redis

What are the features of redis cluster?

Redis3.0 cluster features master-slave replication (read-write separation) The benefits of master-slave replication are 2 points: 1. Avoid redis single point of failure 2. Build a read-write separation architecture to meet application scenarios with more reads and less writes Set up master-slave creation 6379 , 6380, and 6381 directories, copy redis.conf in the installation directory to these three directories respectively. Enter these three directories respectively, modify the configuration files respectively, and set the ports to: 6379 (Master), 6380 (Slave), and 6381 (Slave). At the same time, set the pidfile file to a different path. There are two ways to set master-slave in redis: 1. Set slaveofa)sl in redis.conf

May 27, 2023 pm 10:04 PM

redis

How to implement distributed locks in Go combined with Redis

In the single Redis instance scenario, if you are familiar with Redis commands, you may immediately think of using Redis's setifnotexists operation to implement it, and the current standard implementation method is the series of commands SETresource_namemy_random_valueNXPX30000, where: resource_name indicates the resource to be locked NX indicates that if it does not exist, set PX30000 Indicates that the expiration time is 30000 milliseconds, that is, 30 seconds. The value of my_random_value must be unique on all clients, and the value of all acquirers (competitors) of the same key cannot be the same. The value of value must be a random number

May 27, 2023 pm 09:55 PM

Go redis

How to apply redis lock in php

classLockUtil{privatestatic$lock_prefix='hi_box_lock_';/***@param$key*@paramstring$func operation method*@paramint$timeout*@returnbooltrue not locked false locked*/publicstaticfunctiononLock($key,$func='default ',$timeout=5):bool{if(empty($key)||$

May 27, 2023 pm 09:49 PM

PHP redis

Redis publish/subscribe model example analysis

Redis publish/subscribe application publish/subscribe (pub/sub) is a message communication model. Its main purpose is to decouple the coupling between message publishers and message subscribers. This is similar to the observer pattern in design patterns. Pub/sub not only solves the direct code-level coupling of publishers and subscribers, but also solves the coupling of the two in physical deployment. As a pub/subserver, redis plays a message routing function between subscribers and publishers. Subscribers can subscribe to redisserver for the message types they are interested in through the subscribe and psubscribe commands. Redis calls message types channels. When the publisher passes p

May 27, 2023 pm 09:29 PM

redis

How SpringBoot integrates Redis to achieve high concurrent data caching

What is cache? Cache is a high-speed data exchange memory, which can be used to quickly access and operate data. Let’s take a simple example. Xiao Ming runs a restaurant. When it first opened, due to lack of reputation and few customers, the business was not very busy. He usually stayed idle when there was nothing to do, and went into the kitchen to arrange cooking when guests came. With the increasing development of hotels, the hotels at this time are different from the past. They have a large number of stable customers, and they are even full during certain holidays. According to the previous practice, it will definitely not work. During the peak dining period, customers have to wait for a long time due to slow meal preparation, which has caused repeated complaints to the hotel. In order to solve this problem, Xiao Ming thought of a way to cook popular dishes in advance and put them in the warming cabinet during his free time.

May 27, 2023 pm 09:24 PM

redis SpringBoot

How SpringBoot integrates Redis cache verification code

1. IntroductionRedisisanopensource(BSDlicensed),in-memorydatastructurestore,usedasadatabase,cache,andmessagebroker.Translation: Redis is an open source in-memory data structure storage system, which can be used as: database, cache and message middleware. Redis is an open source, high-performance key-value database developed in C language. The officially provided data can reach **100000+** QPS. QPS (Queries-per-second), the number of queries per second. (

May 27, 2023 pm 09:16 PM

redis SpringBoot

Analysis of bitmap examples in redis

1. What is BitMap? It uses a bit to represent the value or status corresponding to an element, and the key is the corresponding element itself. We know that 8 bits can form a Byte, so the bitmap itself will greatly save storage space. 2^32 power 4 billion data only requires 500M memory, which is 8 times less memory 2. Setbit command introduction setbitkeyoffsetvalue#Set bitmapkey to 20220328 The user with uid 100 has signed in 1setbit202203201001setbit202203202001setbit202203211001setbit202

May 27, 2023 pm 09:07 PM

redis bitmap

How to solve the overcommit_memory error in the redis database under Linux

The background company's redis sometimes fails backgroundsavedb. The following alarm is found through the log, which may be caused by it: [13223]17Mar13:18:02.207#WARNINGovercommit_memoryisseto0!Backgroundsavemayfailunderlowmemorycondition.Tofixthisissueadd'vm.overcommit_memory=1'to/etc/sysctl. confandthenrebootorrun

May 27, 2023 pm 08:55 PM

Linux redis

How to use Spring boot to quickly build a distributed session cache based on Redis

Use Springboot to quickly build a distributed session cache solution based on Redis. In large-scale web applications, session management is very important, which cannot be satisfied by single-machine storage. There are usually the following methods: persisting the session into the database. But the disadvantage is that it is read and write The cost is too high. De-session, such as storing information in cookies. But the disadvantage is that the size is limited and it is not safe. 3. Store the session in a distributed nosql database, such as Redis. Step 1: Build SpringBoot Add maven core dependency spring-session-data-redisorg to the development environment.

May 27, 2023 pm 08:49 PM

redis session spring boot

Example analysis of Redis+Getshell

Preface: When we receive an authorized penetration test, after trying conventional vulnerabilities such as injection and file upload to no avail, scanning ports may reveal unexpected gains. Knowing oneself and knowing the enemy is the best way to win a hundred battles. Redis introduction: Simply put, redis is a Key-Value type database. All redis data is operated in memory, and it can regularly store data in memory on the disk, and supports saving a variety of data. Structure (String, hash, list, etc.). While strategizing, Redis vulnerabilities: 1. Unauthorized access vulnerability Redis will be bound to 0.0.0.0:6379 by default. If IP access is not restricted, the Redis service will be exposed.

May 27, 2023 pm 08:43 PM

redis getshell