Programmer Think

1, Set up etcd cluster There are three main types of self building clusters: Static discovery: the nodes in the etcd cluster are known in advance. When starting, directly specify the addresses of each node of the etcd through the -- initial cluster parameter.Etcd dynamic discovery: the premise of static configuration is that the informati ...

gRPC introduction and installation 1, What is gRPC gRPC introduction gRPC is a high-performance remote procedure call (RPC) framework open source by Google, which can run in any environment. The framework provides load balancing, tracking, intelligent monitoring, authentication and other functions, which can realize the efficient con ...

What is OpenFeign Feign is a declarative Web service client that, in other words, lets you invoke a web service as easily as a method. What can Feign do Feign is designed to make writing Java Http clients easier. Previously, when Ribbon+RestTemplate was used, the encapsulation of http requests using RestTemplate formed a set of templated ...

In business, you need to use modules A and B, which use spring Session to share Session data. The business in module B can only be operated after the user logs in. When A calls B's service, it cannot obtain the user's Session information in module B, resulting in module B determining that the requesting user has not logged in, resulting in modu ...

1, Jenkins+Docker+SpringCloud continuous integration process description General process description: Developers submit their code to the Gitlab code warehouse every day.Jenkins pulls the project source code from Gitlab, compiles it and makes it into a jar package, then builds it into a Docker image, and uploads the image to the privat ...

brief introduction The architecture with microservices does not represent good performance, but the architecture using microservices must require good performance. This sentence is not contradictory. The contradiction is that many people think that microservice architecture represents high concurrency, but it is not. We have the theory of &quo ...

Microservice gateway Basic concepts Each service of microservice generally has different addresses. A service of an external client may call many interfaces, which will bring the following problems The client will request different micro services many times, and the address is complexThere are cross domain requests and the processing is comp ...

1, Core knowledge of service fault tolerance 1.1 avalanche effect In microservice architecture, it is very common for A request to call multiple services. For example, when the client accesses service A, service A needs to call service B, and service B needs to call service C. due to network reasons or its own reasons, if service B or ser ...

Problem Description This is also a real production accident, as shown in the following figure This "avalanche" is an internal system avalanche within an enterprise. We all know that if it exists on external http calls, including all restful, soap requests, HTTP type calls: a->b->c->d assumes that system B is an "int ...

I Microservices 1. Single architecture and distributed architecture Monomer architectureDistributed architecture The system is split according to business functions, and each business module is developed as an independent project to become a service advantage: Disadvantages: the strength of service splitting, how to maintain the address of se ...