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EaseAgent

An agent component for Java system.

Overview

Purpose

  • EaseAgent is a Java agent for APM(Application Performance Management) system.
  • EaseAgent majorly focuses on the Spring Boot development environments.
  • EaseAgent is compatible with mainstream monitoring ecosystems, such as Kafka, ElasticSearch, Prometheus, Zipkin, etc.
  • EaseAgent collects the basic metrics and the service tracking logs, which is very helpful for performance analysis and troubleshooting.

Principles

  • Design for Micro-Service architecture, collecting the data from a service perspective.
  • Instrumenting a Java application in a non-intrusive way.
  • Lightweight and very low CPU, memory, and I/O resource usage.
  • Safe to Java application/service.

Architecture Diagram

image

Description

Instrumenting the method base on Byte buddy technology.

net.bytebuddy.asm.Advice.OnMethodEnter, net.bytebuddy.asm.Advice.OnMethodExit
  1. When the program invokes the enhanced method of class, the method which has the annotation (OnMethodEnter) will be invoked at first.
  2. Method Advice will invoke Metric Interceptor and Tracing Interceptor to processing.
  3. Metric and Tracing information will be stored in MetricRegistry and Tracing.
  4. The Reporter module will get information from MetricRegistry and Tracing and send it to Kafka.
  5. The method which has the annotation (OnMethodExit) will be invoked at last.

Features

  • Collecting Metric & Tracing Logs.
    • JDBC 4.0
    • HTTP ServletHTTP Filter
    • Spring Boot 2.2.x: WebClientRestTemplateFeignClient
    • RabbitMQ Client 5.xKafka Client 2.4.x
    • Jedis 3.5.xLettuce 5.3.x
  • Collecting Access Logs.
    • HTTP ServletHTTP Filter
    • Spring Cloud Gateway
  • Instrumenting the traceId and spanId automatically
  • Supplying the health check endpoint
  • Supplying the readiness check endpoint for SpringBoot2.2.x

QuickStart

Download

Download easeagent.jar from releases releases.

or

$ curl -Lk https://github.com/megaease/easeagent/releases/download/{tag}/easeagent.jar -O

Build From Source

Download EaseAgent with git clone https://github.com/megaease/easeagent.git.

$ cd easeagent
$ mvn clean package -am -pl build

The ./build/target/easeagent-dep.jar is the agent jar with all the dependencies.

Windows platform user please make sure git core.autocrlf is set to false before git clone. You can use git config --global core.autocrlf false to modify core.autocrlf.

Step 1

Extracting the default configuration file.

$ jar xf easeagent.jar agent.properties log4j2.xml

Step 2

  • Modify service name, default configuration is unknown-service.
name=[app-name]
  • Modify kafka server config, default configuration is 127.0.0.1:9092.
observability.outputServer.bootstrapServer = [ip:port]
  • Modify output configuration, if you want to see log information in console.
# metric output
observability.metrics.[xxxx].appendType=console

# tracings output
observability.tracings.output.enabled=false
  • Sending tracing data to zipkin server
# [zipkin]: send data to zipkin server
# [system]: send data to kafka
observability.tracings.output.target=zipkin
# send data to zipkin server
observability.tracings.output.target.zipkinUrl=http://localhost:9411/api/v2/spans

Step 3

Building the demo application.

$ git clone https://github.com/akwei/spring-petclinic-microservices.git
$ cd spring-petclinic-microservices
$ mvn -DskipTests=true package

Step 4

Run the demo application with EaseAgent.

# Open another console
$ java -jar spring-petclinic-config-server/target/spring-petclinic-config-server-2.4.2.jar

# Open another console
$ java -jar spring-petclinic-discovery-server/target/spring-petclinic-discovery-server-2.4.2.jar

# Open another console
$ export EASE_AGENT_PATH=[Replace with agent path]
$ java "-javaagent:${EASE_AGENT_PATH}/easeagent-dep.jar=${EASE_AGENT_PATH}/agent.properties" -Deaseagent.server.port=9900 -jar spring-petclinic-vets-service/target/spring-petclinic-vets-service-2.4.2.jar

# Open another console
$ export EASE_AGENT_PATH=[Replace with agent path]
$ java "-javaagent:${EASE_AGENT_PATH}/easeagent-dep.jar=${EASE_AGENT_PATH}/agent.properties" -Deaseagent.server.port=9901 -jar spring-petclinic-visits-service/target/spring-petclinic-visits-service-2.4.2.jar

# Open another console
$ export EASE_AGENT_PATH=/[Replace with agent path]
$ java "-javaagent:${EASE_AGENT_PATH}/easeagent-dep.jar=${EASE_AGENT_PATH}/agent.properties" -Deaseagent.server.port=9902 -jar spring-petclinic-customers-service/target/spring-petclinic-customers-service-2.4.2.jar

# Open another console
$ export EASE_AGENT_PATH=[Replace with agent path]
$ java "-javaagent:${EASE_AGENT_PATH}/easeagent-dep.jar=${EASE_AGENT_PATH}/agent.properties" -Deaseagent.server.port=9903 -jar spring-petclinic-api-gateway/target/spring-petclinic-api-gateway-2.4.2.jar

Step 5

Adding the following configuration in prometheus.yml

  - job_name: 'petclinic-vets-service'
    static_configs:
    - targets: ['localhost:9900']
    metrics_path: "/prometheus/metrics"

  - job_name: 'petclinic-visits-service'
    static_configs:
    - targets: ['localhost:9901']
    metrics_path: "/prometheus/metrics"

  - job_name: 'petclinic-customers-service'
    static_configs:
    - targets: ['localhost:9902']
    metrics_path: "/prometheus/metrics"

  - job_name: 'petclinic-api-gateway'
    static_configs:
    - targets: ['localhost:9903']
    metrics_path: "/prometheus/metrics"

Start Prometheus

$ ./prometheus --config.file=prometheus.yml

Step 6

Open Browser to visit http://localhost:8080.

After visit more pages, open Prometheus manager http://localhost:9090, and search _00GET__owners. You will see as following.

image

User Manual

For more information, please refer to the User Manual.

Development Guide

Refer to Development-Guide.

Licenses

EaseAgent is licensed under the Apache License, Version 2.0. See LICENSE for the full license text.


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