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Sometimes you need to deploy multiple Tomcat on a server, and distinguish them through different ports, such as reverse proxy. But I don't want to simply copy tomcat, which is not convenient for future upgrade or management. At this time, I need to configure a single machine with multiple instances of ...

This is a basic operation example of Firewalld, using the Firewalld graphical operation interface for access control operation. Experimental topology requirement analysis First, the topology involves two regions. Here, work and public regions are used to make corresponding rules. 1. icmp is forbidden in the work area. 192.168.100.101 is allo ...

Introduction: Production failure scenario introduction Three handshakes in TCP connection TCP disconnect four wave process Analyzing source code with Java stack Find the "culprit" in the stack Summary of problem optimization scheme 1. Production failure scenario introduction Business profile: This service mainly provides external p ...

Background MQ component is an indispensable tool in the system architecture. At the design level, it can reduce the system coupling, and high concurrency scenarios can also play the role of peak cutting and valley filling. From single application to cluster deployment scheme, to the current microservice architecture, MQ has been widely recogniz ...

MyBatis supports persistent enum type properties. Suppose that there is a column of gender type varchar2(10) in the t Uuser table, which stores two values: MALE or FEMALE. In addition, the User object has a gender attribute of enum type, as follows: public enum Gender { MALE,FEMALE; }   By default, MyBatis uses EnumTypeHandler to han ...

1. Application services are not available before startup Assuming that the eureka server service hangs up or does not start before the client application service starts, then the application service can still start normally, but there will be an error message: 2019-10-13 14:40:41.056 INFO 79897 --- [ main] com.netflix.discovery.D ...

I believe you have a general idea of ActiveMQ through your last blog post. So this blog will lead you step by step to actually operate our ActiveMQ. The main contents of this paper are as follows: 1. Introduction of ActiveMQ Terminology and API 2.ActiveMQ Text Message Processing 3.ActiveMQ Object Message Processing Now that we have to le ...

This case is based on an extension of the previous demo. So the database table, in Shiro Integrated SSM Based on URL Privilege Management (I) The beginning is consistent. If the suggestion of the last demo operation is re-imported, avoid problems. This time, it is not achieved through fixed annotations written in the method, but through flexib ...

Linux directory structure Linux directory structure is a tree-like directory structure root directory The starting point of all partitions, directories, files, etc. In the entire tree directory structure, a separate "/" is used. Common subdirectories Catalog Directory name Catalog Directory name /root Administrator's Home Direc ...

1. Overview This article will introduce how to register and consume Dubbo services by using Nacos as configuration and registration center based on Spring Boot 2.x. Version description of integration components: Spring Boot 2.1.9 Dubbo 2.7.3 Nacos 1.1.3 The highlights of this paper are as follows: 1. dubbo is configured by yml mode. 2. Rele ...