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Home

Technical Articles

Database

Redis

How to implement redis cache

1. Use the Pagoda panel to build the WeQing server first. 2. Open PHP management, click Install Extension, and install the redis extension. 3. After installing the redis extension, open redis management and click Performance Adjustment to modify the port number, redis password and a series of other operations. 4. Log in to the WeQing backend, click site settings, find performance optimization in common tools, enter the performance optimization interface, and see if the PHP extension environment already supports redis. 5. Open the Weiqing code, location: /www/wwwroot/your site domain name/data/config.php, modify the code snippet, change mysql to redis and add the following code //--------- ----

May 30, 2023 pm 06:52 PM

redis

How to use redis session sharing with nginx+tomcat

Environment preparation 1. Prepare an nginx server ip192.168.1.133 port 81. Installation process: #First install dependencies: yum-yinstallgcc-c++yum-yinstallpcrepcre-develyum-yinstallzlibzlib-develyum-yinstallopensslopenssl—devel #Note: Installation of nginx is required Use root user to install #Create an nginx directory mkdir/usr/local/src/nginx #Enter the nginx directory cd/usr/local/src/nginx #Download or

May 30, 2023 pm 06:40 PM

redis nginx tomcat

Example analysis of Redis timeout troubleshooting

During the past two days of work, I suddenly received an alarm that Redis was down. At the same time, the group was also saying that a certain Redis connection had timed out. I thought there was a big problem at first, but who knew it would recover after a while. At that time, I logged into the server and checked the monitoring. Take a look at QPS for the first time: You can see that QPS is not high, but why did the data not be obtained for a period of time? Then continue to look at the cpu usage of Redis: you can see that the cpu is saturated, which can also explain why the graph is broken, because redis is single-threaded, and after using 100% of the cpu, it will not be able to process other commands, and zabbix will Unable to execute the info command to obtain qps. Then we already know that the problem is caused by saturation of CPU usage.

May 30, 2023 pm 06:31 PM

redis

How to implement Redis distributed lock and what are its application scenarios

Introduction Lock is a very common tool in the development process. You must be familiar with it, such as pessimistic lock, optimistic lock, exclusive lock, fair lock, unfair lock, etc. There are many concepts. If you don’t understand locks in Java, you can Refer to this article: Java "locks" that must be mentioned. This article is very comprehensive. However, for beginners who know the concepts of these locks, due to lack of practical work experience, they may not understand the actual usage scenarios of unlocking. In Java, thread safety can be achieved through three keywords: Volatile, Synchronized, and ReentrantLock. This part of knowledge will definitely be asked in the first round of basic interviews (you must be proficient in it). In a distributed system, these Java lock technologies cannot lock at the same time.

May 30, 2023 pm 05:55 PM

redis

How to implement Redis tens of billions of key storage solutions

1. Demand background This application scenario is a DMP cache storage requirement. DMP needs to manage a lot of third-party ID data, including the mapping relationship between each media cookie and its own cookie (hereinafter collectively referred to as superid), as well as the superid’s population tag, mobile Population tags of terminal IDs (mainly IDFA and imei), as well as some blacklist IDs, IPs and other data. It is not difficult to store hundreds of billions of records offline with the help of HDFS. However, DMP also needs to provide millisecond-level real-time queries. Since the cookie ID itself is unstable, the browsing behavior of many real users will result in the generation of a large number of new cookies. Only mappi can be synchronized in a timely manner.

May 30, 2023 pm 05:44 PM

redis key

How to install and configure redis in Ubuntu

Use the command line to update all software packages sudoapt-getupdate######Install the Redis database in LinuxUbuntu```LINUX#Install the Redis server~sudoapt-getinstallredis-serverAfter the installation is completed, the Redis server will automatically start, we check Redis server program#Check the Redis server system process~ps-aux|grepredisredis41620.10.0106761420?Ss23:240:00/usr/bin/redis-server/etc/redis/redis.

May 30, 2023 pm 05:31 PM

redis ubuntu

How to connect php to redis

PHP connection redis$redis=newRedis();$redis->connect('127.0.0.1',6379);echo "Connectiontoserversuccessfully";//Check whether the service is running echo "Serverisrunning:".$redis->ping(); 1. Set key/value, check whether key exists, delete key, modify key$redis->set('db&am

May 30, 2023 pm 05:29 PM

php redis

What are the visualization tools for Redis?

1. Command line 1.1, iredis Use iredis, use | to pass redis through the pipe and use other shell tools, such as jq/fx/rg/sort/uniq/cut/sed/awk, etc. to process. It can also auto-complete, highlight, and have many functions. Official website address: https://iredis.io/2, Visualization Tool 2.1, Desktop Client Version 2.1.1, RedisDesktopManager This tool should be the most widely used visualization tool now. It has been around for a long time. It went through several iterations. Cross-platform support. It used to be free, but now it's a paid tool. The trial can last for half a month. [Related recommendations: Redis view

May 30, 2023 pm 05:15 PM

redis

How Docker-Compose builds a Redis cluster

1. The cluster configuration of 3 masters + 3 slaves is only for testing, so I only use one server to simulate the redis list. 2. Write redis.conf and create a directory on the server to store the redis cluster deployment files. The path I put here is /root/redis-cluster. Create redis-1, redis-2, redis-3, redis-4, redis-5, redis-6 folder mkdir in the /opt/docker/redis-cluster directory. -p/opt/docker/redis-cluster/{redis-1,redis-2,redis-3

May 30, 2023 pm 04:46 PM

redis docker docker-compose

What are the persistence methods of Redis?

Redis is single-threaded, why is it so fast? Based on memory, most requests are pure memory operations, and the CPU is not the bottleneck of Redis. Avoid unnecessary CPU context switching and other race conditions, such as lock operations, etc. The bottom layer uses a multi-channel I/O multiplexing model and non-blocking IO. Redis supports multi-threading after 6, but it is not enabled by default. What are the persistence methods of redis? Let’s talk about their differences. Supports AOF and RDB persistence. AOF records every write and delete operation processed by the server in the form of a log. Query operations are not recorded and are recorded in text form. It supports second-level persistence and has good compatibility. For the same number of data sets, AOF files are usually larger than RDB files, so

May 30, 2023 pm 04:25 PM

redis

How to deploy redis on linux

1. Download the Linux version of redis from the official website 2. Copy it to the linux server and unzip it to the specified directory 3. After unzipping, get the redis folder ----- move it to a file location you know 4. Note: redis is written in C language and needs Relying on the c language environment yuminstallgcc-c++tcl, enter the redis installation directory and execute make---------------Compile redis Note: Make compilation of redis6 or above may report an error, and you need to upgrade the gcc version# One step sudoyuminstallcentos-release-scl#The second step sudoyuminstalldevto

May 30, 2023 pm 04:08 PM

linux redis

Redis command usage example analysis

The cause of the problem is that the application the editor is responsible for is a management background application. Shiro framework is used for permission management. Since there are multiple nodes, distributed Session needs to be used, so Redis is used to store Session information. Since Shiro does not directly provide the Redis storage Session component, Afan had to use shiro-redis, an open source component from Github. Since the Shiro framework needs to regularly verify whether the Session is valid, the bottom layer of Shiro will call SessionDAO#getActiveSessions to obtain all Session information. And shiro-redis just inherits Session

May 30, 2023 pm 03:46 PM

redis

How to set a password for redis in Windows

There are two ways to set a password. 1. Set the password on the command line. Run cmd to switch to the redis root directory. First start the server>redis-server.exe. Open another cmd to switch to the redis root directory. Start the client>redis-cli.exe-h127.0.0.1-p6379. Use the configgetrequirepass command on the client. View password>configgetrequirepass1)"requirepass"2)""//The default empty client uses configsetrequirepassyourp

May 30, 2023 pm 02:40 PM

redis windows

How to implement Redis BloomFilter Bloom filter

BloomFilter concept Bloom filter (English: BloomFilter) was proposed in 1970 by a young man named Bloom. It's actually a long binary vector and a series of random mapping functions. Bloom filters can be used to retrieve whether an element is in a collection. Its advantage is that space efficiency and query time are far higher than those of ordinary algorithms. Its disadvantage is that it has a certain misrecognition rate and difficulty in deletion. BloomFilter Principle The principle of the Bloom filter is that when an element is added to the set, the element is mapped into K points in a bit array through K hash functions and set to 1. When retrieving, we only need to see if these points are all 1 to (approximately) know whether it is in the set:

May 30, 2023 pm 01:41 PM

redis bloomfilter