Programmer Group

Following is a step-by-step tutorial on learning docker Common commands: Delete all containers docker rm `docker ps -a -q` View all containers docker container ls --all Stop a single container docker container stop container id Remove all mirrors docker rmi `docker images -q` Remove a single image docker rmi mirror id ...

1. Trampling Records in Spring Use image Spring uses multiple data sources through annotations Pit: @Autowire is automatically injected by byType, while @Resource is automatically injected by byName by default, @Primary is the preferred choice. For example, in a project there are two Redis sources, dataRedisTemplate and red ...

Preface The goal of this project is to install a series of common application services for back-end development on the newly installed CentOS 7.5 system (CentOS installation is not described here), and to deploy a website using phpMyAdmin as an example. Nginx(1.16) MySQL(8.0, Start Up) PHP(7.3) Redis(1.5) memcached(1.4) Composer(1.8) phpMyAdmi ...

Reasons for the study: When spring boot uses redis to get data and convert it to objects, Always prompt: "com.alibaba.fastjson.JSONException: syntax error, expect {, actual [, pos 0"." Finally, it is found that this is due to the serialization of redis. So let's analyze the way redis is serialized: 1. In spri ...

Preface Jedis is the preferred client for java application to access Redis service. This paper analyses the source code of jedis client, and picks up the common routine of client design and implementation. Connection To access (Redis) services, you first need to establish a connection with the service, so the client library first needs to abstr ...

This time I share with you the usage of RedisMQ queue, the first two articles Queue Factory (MSMQ) and RabbitMQ of Queue Factory Briefly introduce the construction of the corresponding queue environment and the use of common methods, together with the EDIS MQ shared in this article, we have achieved the goal of "three swordsmen" in ou ...

For an Internet platform, high concurrency is a common scenario. The most representative ones are secondkill and snap-up. High concurrency has three characteristics: 1. High concurrent reading 2. High concurrent write (consistency) 3. Oversell How does the front end respond? 1. Caching static data, such as pictures, html pages, js, etc. 2. Buil ...

*** Documents can not be uninstalled [root@gfsd1 mnt]# umount 20170228_Mustang_V5R1_SP1/ umount: /mnt/20170228_Mustang_V5R1_SP1: target is busy. (In some cases useful info about processes that use the device is found by lsof(8) or fuser(1)) [root@gfsd1 mnt]# Solution *** Find the processes and commands that use this file, a ...

An asynchronous agent pool is implemented using python asyncio. The free agent on the agent website is crawled according to the rules and stored in redis after verifying its validity. The number of agents is regularly expanded and the validity of agents in the pool is checked to remove invalid agents. At the same time, a server is implemented w ...

Today we're going to talk about wehsocket and node development long connection. In a real project, we may want to achieve a function that is not a simple chat function. Now we need to integrate it. Redis Rabbit MQ, etc. implements o2o's reminder function: First, integrate a redis: We create a chat folder in which we write a package.json ...