Docker /git 结合 Jenkins

docker+Jenkins

结合Jenkins大体思路：将springboot应用打包并发布成docker镜像，然后再运行。Jenkins主要执行的步骤是：拉取代码--->打包--->发布镜像---->运行镜像

1. spring boot 应用配置

   添加下面maven插件：

   dockerfile 位置根据具体情况修改！！！

   <plugins><plugin><groupId>org.springframework.boot</groupId><artifactId>spring-boot-maven-plugin</artifactId></plugin><plugin><groupId>com.spotify</groupId><artifactId>dockerfile-maven-plugin</artifactId><version>1.4.13</version><executions><execution><id>default</id><goals><goal>build</goal><goal>push</goal></goals></execution></executions><configuration><repository>${project.name}</repository><tag>${project.version}</tag><buildArgs><JAR_FILE>${project.build.finalName}.jar</JAR_FILE></buildArgs><dockerfile>./Dockerfile</dockerfile></configuration></plugin></plugins>

2. 编写docker file

   FROM openjdk:8-jre-slim
   MAINTAINER xuxueliENV PARAMS=""ENV TZ=PRC
   RUN ln -snf /usr/share/zoneinfo/$TZ /etc/localtime && echo $TZ > /etc/timezoneCOPY target/xxl-job-executor-0.0.1-SNAPSHOT.jar /app.jarENTRYPOINT ["sh","-c","java -jar $JAVA_OPTS /app.jar $PARAMS"]

   只需要改变下target(打包完之后的包名)

3. 新建Jenkins应用，并配置好git信息。仓库地址和验证信息和分支等

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2. 加入maven构建

[图片上传中...(image-20210312095914050.png-98c522-1615859185694-0)]

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3. 设置maven的setting文件【非必须】

   因为默认的setting下载会很慢，所以需要更改setting文件

   a. 进入manage jenkins----> manage files

image-20210312095914050.png

b. 新增config

image-20210312095929282.png

c. 选择mave setting.xml，并提交

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d. settting 复制进去

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4. 选择刚刚设置好的maven setting.xml,打开maven的高级设置

   maven 目标：clean -U -Dmaven.skip.test=true package

   

   image-20210312101451622.png

6. 添加脚本：

   docker stop xxl-job-executor
   docker start xxl-job-executor

7. 测试脚本，直接build，一步一个脚印，一行一行脚本调试

问题记录：

1. docker运行提示：

   Exception in thread "main" java.lang.NoClassDefFoundError: org/springframework/boot/SpringApplication

   原因：包没有引入

   解决方案：精简maven插件：

2. no main manifest attribute

   原因：

   1. plugins 中是按顺序执行的，顺序反了必然会出现问题。

   2. springboot结构不完整。需要有完整的父依赖(https://stackoverflow.com/questions/54867295/springboot-no-main-manifest-attribute-maven)

   3. maven执行springboot的repackge目标：mvn package spring-boot:repackage

   4. 或者maven添加插件：

      <plugin><groupId>org.springframework.boot</groupId><artifactId>spring-boot-maven-plugin</artifactId><configuration><mainClass>com.places.Main</mainClass></configuration><executions><execution><goals><goal>repackage</goal></goals></execution></executions></plugin>

   5. springboot 打包运行成功要素

      3 things:
      - You have the parent entry in your pom.
      - Verify that your plugin is in the build portion of the pom.
      - You have a class with the @SpringBootApplicaion annotation.pom.xml:...  <parent><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-parent</artifactId><version>2.1.8.RELEASE</version></parent><build><plugins><plugin><groupId>org.springframework.boot</groupId><artifactId>spring-boot-maven-plugin</artifactId></plugin></plugins></build>
      ...
      And a class that looks something like this:@SpringBootApplication
      public class Application {public static void main(String[] args) {SpringApplication.run(Application.class, args);}}