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Home

Technical Articles

Database

Redis

How Docker deploys SpringBoot projects and integrates Redis images for access counting

The final effect is as follows: 1. Install DockerCE2. Run the Redis image 3. Java environment preparation 4. Project preparation 5. Write Dockerfile 6. Release the project 7. Test service environment preparation system: Ubuntu17.04x64Docker17.12.0-ceIP:45.32. 31.101 1. Installing DockerCE in China is not recommended: "Script to install", the download and installation will be very slow, use step 1 to install, see the link below: Conventional installation method 1. Conventional installation method Ubuntu17.04x64 installs DockerCE2. Script to install domestically It is not recommended to use scripts for installation: Install DockerCE

Jun 02, 2023 am 10:37 AM

redis docker springboot

How to build a redis-sentinel cluster based on docker

1. Overview Redis cluster can achieve high availability and sharding among a group of redis nodes. There will be 1 master and multiple slave nodes in the cluster. When the master node fails, a slave node should be elected as the new master. However, redis itself (including many of its clients) does not have the ability to implement automatic fault discovery and perform active-standby switching, and requires an external monitoring solution to achieve automatic fault recovery. redissentinel is the officially recommended high availability solution. It is a monitoring and management tool for redis clusters, which can provide node monitoring, notification, automatic fault recovery and client configuration discovery services. 2. Problems encountered 1. dock

Jun 02, 2023 am 10:19 AM

redis docker sentinel

How spring boot integrates redis master-slave sentinel method

Springboot integrates redis master-slave sentinel one master, two slaves and three sentinel configuration 1, master:127.0.0.1:63792, slave1:127.0.0.1:63803, slave2:127.0.0.1:63814, sentinel1:127.0.0.1:263795, sentinel2:127.0 .0.1:264796, sentinel3:127.0.0.1:265797, monitoring host name: mymaster8, attach the configuration of sentinel1 port26379sentinelmonitorm

Jun 02, 2023 am 09:22 AM

redis spring boot

How to realize flash sale scenario of inventory reduction through redis

The main purpose of Redis inventory reduction is to reduce access to the database. The previous inventory reduction directly accessed the database and read the inventory. When high concurrent requests come, a large amount of read data may cause the database to crash. Usage idea: When the system is initialized, the product inventory is loaded into the Redis cache and saved. When receiving the request, first get the inventory value of the product in Redis and pre-reduce the inventory. If the inventory is insufficient after the reduction is completed, a logical Exception will be returned directly and there is no need to access the database to reduce the inventory. If the inventory value is correct, Go to the next step. Enqueue the request and immediately return a value to the front end, indicating that it is being queued, and then perform the flash killing logic. The back end queue performs the flash killing logic, and the front end polls the back end to send the request.

Jun 02, 2023 am 09:04 AM

redis

How to deploy Redis5.0.3 on CentOS7.6

1. Deployment steps 1. Installing gcc dependencies Since redis is developed in C language, you must first confirm whether the gcc environment (gcc-v) is installed before installation. If it is not installed, execute the following command to install it. #yuminstall-ygcc2． Download and install #wgethttp://download.redis.io/releases/redis-5.0.3.tar.gz#tar-zxvfredis-5.0.3.tar.gz3． Switch to the decompression directory and compile #cdredis-5.0.3#make4． Install to the specified directory #makeinstallPREFIX=/usr/local/re

Jun 02, 2023 am 08:34 AM

redis centos

Example analysis of Redis persistence mechanism

Redis stores data in memory, and the data is lost when the process exits. The Redis persistence mechanism can store the data in the memory to the disk, and when restarting, the data can be read from the disk file and loaded into the memory. Redis supports two persistence mechanisms: full mirror RDB and incremental persistence AOF. RDB is a snapshot of Redis, which stores all unexpired key-value pairs in Redis. Configure RDB in redis.conf: dbfilenamedump.rdbdir/var/lib/redissave9001save30010save6010000save""stop-writ

Jun 01, 2023 pm 10:30 PM

redis

How to build a Redis cluster

Redis cluster is a distributed service cluster composed of multiple master-slave node groups. It has replication, high availability and sharding features. Redis cluster can complete node removal and failover functions without sentinel. Each node needs to be set to cluster mode. This cluster mode has no central node and can be expanded horizontally. According to official documents, it can be linearly expanded to tens of thousands of nodes (the official recommendation is no more than 1,000 nodes). The performance and high availability of the redis cluster are better than the previous version of sentinel mode, and the cluster configuration is very simple. Build the environment system: centos7.4 server Kingsoft Cloud installation ruby ??environment [root@jsy-bj-test00~]#yuminstall

Jun 01, 2023 pm 10:28 PM

redis

How to use PHP to record the type of redis

redis_hash.phpredis_set.phpredis_list.phpredis_string.phpredis_sortedset.php

Jun 01, 2023 pm 09:07 PM

php redis

What is the process of Redis request processing?

Overview #The first is to register the processor; open the loop listening port, and create a Goroutine every time a connection is monitored; then the Goroutine will wait in a loop to receive the request data, and then match the corresponding address in the processor routing table according to the requested address processor, and then hands the request to the processor for processing; expressed in code is this: func(srv*Server)Serve(lnet.Listener)error{...baseCtx:=context.Background()ctx:=context.WithValue( baseCtx,ServerContextKey,srv)fo

Jun 01, 2023 pm 08:49 PM

redis

What are the reinforcement measures for Redis cache database?

Sensitive data and encryption protection 1. Password saving (important) Security issues: The native Redis server passwords requirepass and masterauth are saved in clear text to redis.conf. Solution: The server password is encrypted using PBKDF2 and saved to redis.conf. Considering performance issues, it would be time-consuming to use PBKDF2 for each authentication. After review, after the first authentication is successful, the memory will be cached with SHA256, and subsequent requests will be verified using SHA256 first. 2. Support key replacement (important) Security issues: The keys involved in encryption and decryption cannot be hard-coded into the code. Solution: The secret key supports regular replacement. ?redis server redis-serv

Jun 01, 2023 pm 08:28 PM

redis

What is the asynchronous mechanism of Redis

1. The blocking points of Redis and the objects that the Redis instance interacts with, as well as the operations that will occur during the interaction: Client: network IO, key-value pair addition, deletion, modification and query operations, database operations; disk: generate RDB snapshot, record AOF log, AOF log Rewrite; master-slave node: the master library generates and transmits RDB files, the slave library receives RDB files, clears the database, and loads RDB files; slicing cluster instances: transmits hash slot information to other instances and migrates data. The relationship between the 4 types of interactive objects and specific operations: Blocking points when interacting with clients: Network IO is sometimes slow, but Redis uses an IO multiplexing mechanism to avoid the main thread waiting for the network. The status of a connection or request incoming, so network IO is not

Jun 01, 2023 pm 08:14 PM

redis

What are the introductory knowledge points of redis?

Redis is a high-performance key-value database. The emergence of redis has largely compensated for the shortcomings of keyvalue storage such as memcached, and can play a very good supplementary role to relational databases in some situations. 1. Install RedisRedis configuration file: /etc/redis.confRedis main program: /usr/bin/redis-server Client tool: /usr/bin/redis-cli Default listening port: 6379 Data directory: /var/lib/redis Service script:/usr/lib/systemd/system/redis.servicey

Jun 01, 2023 pm 07:55 PM

redis

How to install Redis5.0 on Centos7

1. Install gcc dependencies. Since redis is developed in C language, you must first confirm whether the gcc environment (gcc-v) is installed before installation. If it is not installed, execute the following command to install it [root@localhostlocal]#yuminstall-ygcc 2. Download and Unzip the installation package [root@localhostlocal]#wgethttp://download.redis.io/releases/redis-5.0.3.tar.gz[root@localhostlocal]#tar-zxvfredis-5.0.3.tar.gz 3. cd Switch to redi

Jun 01, 2023 pm 07:08 PM

redis centos

How to use Redis and Memcached in php

Differences 1. Redis is a storage database. Memcache can also cache photos. Redis and Memcache store data in memory and are memory databases. However, Memcache can also cache other things like photos and videos. Redis not only supports simple k/v type data, but also provides storage of data structures such as list, set, and hash. Expiration strategy, memcache is specified when setting. For example, setkey1008 never expires. redis can be set via expire. For example, expirename10. Storage security, after memcache is closed, redis data disappears and can be regularly saved on the disk.

Jun 01, 2023 pm 05:46 PM

php redis memcached