Microservices - CatWolf

Microservices

Traditional Linux replaces Docker microservice operation and maintenance-swarm, Portainer

Swarm is a cluster management tool officially provided by Docker. Its main function is to abstract several Docker hosts into a whole, and manage various Docker resources on these Docker hosts through a single entry. Portainer is a lightweight Docker graphical management solution. It is easy to deploy Portainer and Portainer Agent to manage Swarm clusters! You can deploy Portainer as a service directly in a Docker cluster. Please note that this method will automatically deploy a single instance o

Microservices

Defects of javascript language number operation

Preface Anyone who has gotten started with js knows that the mathematical operations of js are flawed. Of course, this problem does not only appear in Javascript. Almost all programming languages use IEEE-745 floating point number notation. Any use The programming language of binary floating-point numbers will have this problem, but in many other languages, methods have been encapsulated to avoid the problem of precision. JavaScript is a weakly typed language, and there is no such thing as floa

Microservices

In-depth analysis of the memory model of Java multithreading

Internal java memory model Hardware-level memory model The relationship between Java memory model and hardware memory model Visibility of shared objects Resource racing The Java memory model is a good description of how the JVM works in memory. JVM can be understood as an operating system executed by Java. As an operating system, there is a memory model, which is what we often call the JAVA memory model. If we want to write multi-threaded parallel programs correctly. It is extremely important t

Microservices

The interviewer asks how many bytes the new Object occupies in the memory, you have to answer this...

Staying up late is not easy, and do it and cherish it. Welcome to the veterans of one-key three-connection, for encouragement, thank you very much. How to know the size of an object in memory? There is something called sizeOf in C language, it is very convenient to know the size of the object. But Java doesn't have such a thing, don't panic, Java itself has an Agent technology. Java Agent technology What mechanism is Agent? For the jvm virtual machine, to load a class to the memory, an agent ca

Microservices

Leetcode 206 Question Reverse Linked List (Reverse Linked List) Java language solution

Title description: Reverse a singly linked list. Example: Input: 1->2->3->4->5->NULL Output: 5->4->3->2->1->NULL Iterative solution /**Definition for singly-linked list.public class ListNode {     int val;     ListNode next;     ListNode(int x) { val = x; }} */class Solution {    public&nb

Microservices

[Java] Memory visibility and lock efficiency test

Let's talk about the conclusion first The fundamental ways to brush memory visibility are : volatile, synchronized Other ways to extend are : AtomicInteger (using volatile), System.out.println (using synchronized), lock(), the underlying implementation is volatile Suggestion : using volatile and AtomicInteger lock-free code is more efficient than synchronizers and locks, using AtomicInteger is the safest Update content : The specific understanding of the happens before rule: If thread 1 writes v

Microservices

Java version of e-commerce spring cloud distributed microservice b2b2c social e-commerce (14) service registration (consul)

Springcloud b2b2c e-commerce social platform source code, please add penguin request: one zero three eight seven seven four six two six. This article mainly introduces the spring cloud consul component, which is a tool that provides service discovery and configuration. Consul is distributed, highly available, and highly scalable.1. Introduction to Consul Consul has the following properties:Service discovery: Consul registers services through http, and services and services interact with each oth

Microservices

Let s talk about PL/SQL of programming language and philosopher (Oracle)

PL/SQL (Procedural Language/SQL) is a procedural language and belongs to the third-generation language. It pays attention to details like C, C++, Java and other languages, and can be used to implement more complex business logic. It allows SQL data manipulation language and query statements to be included in block structure (block_structured) and code procedure language, making PL/SQL a powerful transaction processing language. In terms of Oracle database management, PL/SQL is a procedural langu

Microservices

The programming language of these sunset products is about to die, have you learned it?

Today's developers tend to use new programming languages, but what about old programming languages? They generally have two futures: they can still be used, but they are gradually unpopular with everyone; they die completely. The programming language of these sunset products is about to die, have you learned it? Dart is a programming language launched by Google in 2011. Its syntax is similar to C language and can be translated into Javascript. After Dart was released at the GOTO conference in Aa

Microservices

C language RSA algorithm implementation (based on Mbedtls)

In recent projects, the RSA algorithm needs to be implemented through the C language. Here I implement it through the Mbedtls library. 1. Download Mbedtls First, we put the Mbedtls code into the project, the related portals are as follows: Mbedtls official download address The official website is slow to download from abroad, so the Mbedtls code used in this article is also attached. The portal is as follows: Mbedtls encryption and decryption tool code 2. Introduce the Mbedtls header file Here w

Microservices

Coroutine, C language implementation

Coroutine, C language implementation Interestingly, this is not a popular science article. What is a coroutine By convention, this article should talk about what a coroutine is, rather than anxiously start talking about the details of the implementation, not to mention the fact that the implementation of a coroutine is not very complicated. But there are too many articles about what a coroutine is. There are some in one language, some are false, and even more random. What is in the word is like

Microservices

Talk about the producer consumer model in Java-BlockingQueue

Preface I believe you are familiar with the producer/consumer model , and it is a very common distributed resource scheduling model. In this model, there are at least two objects: producers and consumers. The producer is only responsible for creating resources, and the consumer is only responsible for using resources. It is also easy to implement a simple producer/consumer model by yourself, nothing more than to do it through a queue, but this approach has many hidden flaws: Need to ensure the t

Microservices

After playing microservices for so long, you don't even know about RPC, do you?

First understand what is RPC, why RPC, RPC refers to remote procedure call, that is to say, two servers A and B, one application is deployed on server A, and you want to call the functions/methods provided by the application on server B, because they are not there. A memory space cannot be called directly, and the semantics of the call and the data of the call need to be expressed through the network.RPC function goalThe main functional goal of RPC is to make it easier to build distributed compu

Microservices

Analysis of the details of the Monero (XMR) lock transfer attack

  By: ISME @SlowMist Team Recently, according to the intelligence of the SlowMist Zone, a lock-in attack on Monero (XMR) transfers has occurred on multiple exchanges. The SlowMist security team will analyze and follow up as soon as the intelligence is received. We are based on the principle of responsible disclosure. In the slow fog area, early warning was carried out and timely intelligence synchronization and assistance in detection and repair were carried out for the customers we serve.

Microservices

How to use the default attribute in QML language

When we look at the QML code, we may often see the default default property with property . What is the use of this attribute? In today's routine, let's explain it in detail. \ According to the introduction of the QML language, any QML object has one and only one default attribute. In the English article, the specific description is as follows: \ An object definition can have a single default property. A default property is the property to which a value is assigned if an object is declared withi

Microservices

Linux OOM-killer mechanism (out of memory)

I returned to the company this morning and found that a server game process was hung up. The first thing that came to my mind was that the cloud server host was down and was restarted (because I had encountered it twice before), so I immediately logged on to the server and checked the process log first. Determine the time when the process was killed, and then check the kernel log /var/log/message to find the following It was determined that insufficient memory caused the system to trigger the OO

Microservices

In-depth understanding of the kafka knowledge points of the distributed system

 Kafka is a distributed publish-subscribe messaging system. It was originally developed by LinkedIn and later became part of the Apache project. Kafka is a distributed, partitionable, redundant and persistent log service. It is mainly used to process active streaming data.In a big data system, a problem is often encountered. The entire big data is composed of various subsystems, and data needs to flow continuously in each subsystem with high performance and low latency. Traditional enterpri

Microservices

Alibaba architects carefully organize: JVM+MySQL+distributed+microservices, the sword points to Ali, the charge

PrefaceEvery programmer has a dream of a big factory, and the Internet big company bears the brunt of it. Alibaba is naturally the most popular. This book list carefully compiled by the architect of Alibaba , it will be easy to get into the big factory. Let s take a look. Bar:In-depth understanding of the advanced features and best practices of the Java virtual machine JVMDue to the limited space of the platform articles and the excessive details, only some of the knowledge points are screenshot

Microservices

Is microservice equal to Spring Cloud? This article tells you what a microservice is.

A Preliminary Study of Microservices What is a microservice First of all, there is no official definition of microservices. It is difficult to describe microservices directly. We can understand what microservices are by comparing traditional WEB applications. The core of traditional WEB application is divided into business logic, adapter and API or WEB interface accessed through UI. Business logic defines business processes, business rules, and domain entities. The adapter includes database acce

Microservices

Peek into memory optimization from Java garbage collection mechanism

As an Android engineer, I have read a lot of related optimization articles about Android memory leaks, most of which tell you what to do, what to do, and some specific measures. And it never explained why it was done. Today, I want to start with the mechanism behind this aspect of memory optimization, and explore the principles behind it. However, if you want to study Java's memory optimization, you must study the Java recovery mechanism. If you want to be able to understand GC basically, you mu

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