You must know the Druid monitoring distributed solution

What is Druid Monitor

Druid is a very powerful database connection pool, but its power is not only reflected in the speed of data access and connection management as a high-performance connection pool, it has a built-in powerful monitoring tool: Druid Monitor . Not only can monitor data sources and slow queries, but also monitor web applications, URI monitoring, Session monitoring, Spring monitoring, etc.

• ip:port/druid/sql.html

  

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What is Druid Admin

• As mentioned above, Druid Monitor provides powerful monitoring capabilities, but currently it is only for monitoring a single service instance . In the micro-services architecture [1] increasingly popular nowadays, have the same service may have N instances, monitored dimension needs to rise to the cluster .

• After the official version of druid 1.2.1, the druid-admin[2] module is provided to solve the problem of cluster monitoring.

• As shown in the figure below, we can dynamically switch the service name on the original monitoring cluster to achieve a monitoring entry and realize the monitoring switching of different services .

Spring Cloud Stater package

• The official druid-admin is currently under development and cannot be directly compiled and run (depending on package error, java11 not supported, etc.).

• druid-admin itself is a directly runnable web service, which is not very friendly to existing services and cannot do the plug and play of spring boot admin[3]

• Therefore, based on the above problems, the author made relevant modifications to druid-admin and directly extracted it into a spring boot starter and introduced it for use.

1. Increase dependence

  <dependency>
   <groupId>com.pig4cloud.plugin</groupId>
   <artifactId>spring-cloud-starter-druid-monitor</artifactId>
   <version>0.0.1</version>
  </dependency>


  <!--注册中心客户端（支持 nacos/eureka/consul）-->
  <dependency>
   <groupId>com.alibaba.cloud</groupId>
   <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
  </dependency>
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2. Access to the registry and list of services to be monitored

spring:
  cloud:
    nacos:
      discovery:
        server-addr: 127.0.0.1:8848

# druid-admin 需要监控的列表
monitor:
  applications:
    - pigx-upms-biz
    - pigx-auth
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3. The target service exposes the druid monitoring endpoint

spring:
  datasource:
    druid:
      stat-view-servlet:
        enabled: true
        allow: ""
        url-pattern: /druid/*
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4. Visit druid-admin to view cluster monitoring

• ip:port/druid/sql.html

Integrate Spring Boot Admin

• Introduce the above dependencies and add the following configuration

spring:
  boot:
    admin:
      ui:
        external-views:
          - label: "SQL监控"
            url: /druid/sql.html
            order: 2000
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Use restrictions

• Since the login verification of druid monitor is based on session design, it is not applicable to stateless microservices. It is recommended to directly expose all druid-related endpoints and unify interface permissions through the front gateway.

• The current instance monitoring data is stored in the corresponding memory, and is only displayed after being summarized by each instance during viewing, and will be persisted later.