使用jib-maven-plugin实现java应用docker化

增加插件依赖

引用结构:

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<project>
  ...
  <build>
    <plugins>
      ...
      <plugin>
        <groupId>com.google.cloud.tools</groupId>
        <artifactId>jib-maven-plugin</artifactId>
        <version>1.0.2</version>
        <configuration>
          <to>
            <image>your_image</image>
          </to>
        </configuration>
      </plugin>
      ...
    </plugins>
  </build>
  ...
</project>

构建docker镜像

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mvn compile jib:build

或者使用本地存在的docker环境命令

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mvn compile jib:dockerBuild

绑定生命周期

例如绑定到package,增加executions段

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<plugin>
  <groupId>com.google.com.tools</groupId>
  <artifactId>jib-maven-plugin</artifactId>
  ...
  <executions>
    <execution>
      <phase>package</phase>
      <goals>
        <goal>build</goal>
      </goals>
    </execution>
  </executions>
</plugin>

就可使用
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mvn package

使用案例

Java Main Class方式应用

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<project>
  ...
  <build>
    <plugins>
      ...
      <plugin>
		<groupId>com.google.cloud.tools</groupId>
		<artifactId>jib-maven-plugin</artifactId>
		<version>1.0.2</version>
		<configuration>
			<from>
    			<image>openjdk:alpine</image>
  			</from>
			<to>
				<image>your_image</image>
				<tags>
	                <tag>latest</tag>
	              </tags>
			</to>
			<container>
				<jvmFlags>
				  <jvmFlag>-Xms512m</jvmFlag>
				  <jvmFlag>-Xdebug</jvmFlag>
      			  <jvmFlag>-Xmy:flag=jib-rules</jvmFlag>
				</jvmFlags>
				<mainClass>yourpackage.app.main</mainClass>
				<args>
				  <arg>some</arg>
				  <arg>args</arg>
				</args>
				<ports>
				  <port>8080</port>
				  <port>2000-2003/udp</port>
				</ports>
				<labels>
				  <key1>value1</key1>
				  <key2>value2</key2>
				</labels>
				<format>OCI</format>
			</container>
		</configuration>
		<executions>
		<execution>
		  <phase>package</phase>
		  <goals>
		    <goal>dockerBuild</goal>
		  </goals>
		</execution>
		</executions>
      </plugin>
      ...
    </plugins>
  </build>
  ...
</project>

解释:
1.从docker-hub拉取openjdk:alpine镜像作为基础镜像
2.构建标识为your_image的镜像,tag列表为latest
3.容器启动时将通过java -Xms512m -Xdebug -Xmy:flag=jib-rules -cp app/libs/*:app/resources:app/classes yourpackage.app.main some args来运行应用
4.并且暴露出端口8080,udp端口段2000-2003
5.增加两个label
6.使用OCI格式
7.docker构建绑定到package生命周期

JavaWeb War方式应用

例如

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<project>
  ...
  <build>
    <plugins>
      ...
      <plugin>
		<groupId>com.google.cloud.tools</groupId>
		<artifactId>jib-maven-plugin</artifactId>
		<version>1.0.2</version>
		<configuration>
			<from>
              <image>tomcat:8.5-jre8-alpine</image>
            </from>
			<to>
				<image>your_image</image>
				<tags>
	                <tag>latest</tag>
	              </tags>
			</to>
			<container>
				<args>
				  <arg>some</arg>
				  <arg>args</arg>
				</args>
				<appRoot>/usr/local/tomcat/webapps/ROOT</appRoot>
				<ports>
				  <port>8080</port>
				</ports>
				<labels>
				  <key1>value1</key1>
				  <key2>value2</key2>
				</labels>
				<format>OCI</format>
			</container>
		</configuration>
		<executions>
		<execution>
		  <phase>package</phase>
		  <goals>
		    <goal>dockerBuild</goal>
		  </goals>
		</execution>
		</executions>
      </plugin>
      ...
    </plugins>
  </build>
  ...
</project>

同上面Java Main Class方式基本一样,只是将忽略mainClass及jvmFlags,这里新增了appRoot来指定容器内war包的部署路径

运行构建好的镜像

命令示例,请勿直接使用

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docker service create \
	--name="your_app" \
	--network traefiknet \
	--container-label traefik.backend="your_app" \
	--container-label traefik.frontend.entryPoints="http,https" \
	--container-label traefik.frontend.rule="Host: your.domain.com" \
	--container-label traefik.frontend.redirect.entryPoint="https"  \
	--container-label traefik.port='8080' \
	--container-label traefik.protocol='http' \
	--replicas 1 your_image:latest

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docker service create \
	--name="your_app" \
	--publish="8080:8080" \
	--replicas 1 your_image:latest
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docker run -d --name="your_app" -p 8080:8080 --restart=always your_image:latest

结束