Java開發提升十倍生產力:Idea遠端一鍵部署springboot到Docker

陶章好發表於2019-06-13

Idea是Java開發利器，springboot是Java生態中最流行的微服務框架，docker是時下最火的容器技術，那麼它們結合在一起會產生什麼化學反應呢？

一、開發前準備

1. Docker的安裝可以參考https://docs.docker.com/install/

2. 配置docker遠端連線埠

  vi /usr/lib/systemd/system/docker.service
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找到 ExecStart，在最後面新增 -H tcp://0.0.0.0:2375，如下圖所示

Java開發提升十倍生產力:Idea遠端一鍵部署springboot到Docker

3. 重啟docker

 systemctl daemon-reload
 systemctl start docker
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4. 開放埠

firewall-cmd --zone=public --add-port=2375/tcp --permanent  
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5. Idea安裝外掛,重啟

6. 連線遠端docker

(1) 編輯配置

(2) 填遠端docker地址

(3) 連線成功，會列出遠端docker容器和映象

二、新建專案

1. 建立springboot專案

專案結構圖

(1) 配置pom檔案

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>docker-demo</groupId>
    <artifactId>com.demo</artifactId>
    <version>1.0-SNAPSHOT</version>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.0.2.RELEASE</version>
        <relativePath />
    </parent>

    <properties>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
         <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
         <docker.image.prefix>com.demo</docker.image.prefix>
         <java.version>1.8</java.version>
    </properties>
    <build>
        <plugins>
          <plugin>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-maven-plugin</artifactId>
          </plugin>
        <plugin>
           <groupId>com.spotify</groupId>
           <artifactId>docker-maven-plugin</artifactId>
           <version>1.0.0</version>
           <configuration>
              <dockerDirectory>src/main/docker</dockerDirectory>
              <resources>
                <resource>
                    <targetPath>/</targetPath>
                    <directory>${project.build.directory}</directory>
                    <include>${project.build.finalName}.jar</include>
                </resource>
              </resources>
           </configuration>
        </plugin>
        <plugin>
            <artifactId>maven-antrun-plugin</artifactId>
            <executions>
                 <execution>
                     <phase>package</phase>
                    <configuration>
                        <tasks>
                            <copy todir="src/main/docker" file="target/${project.artifactId}-${project.version}.${project.packaging}"></copy>
                        </tasks>
                     </configuration>
                    <goals>
                        <goal>run</goal>
                    </goals>
                    </execution>
            </executions>
        </plugin>

       </plugins>
    </build>
<dependencies>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-web</artifactId>
    </dependency>
    <dependency>
  <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-test</artifactId>
        <scope>test</scope>
    </dependency>
    <dependency>
        <groupId>log4j</groupId>
        <artifactId>log4j</artifactId>
        <version>1.2.17</version>
    </dependency>
</dependencies>
</project>
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(2) 在src/main目錄下建立docker目錄，並建立Dockerfile檔案

FROM openjdk:8-jdk-alpine
ADD *.jar app.jar
ENTRYPOINT ["java","-Djava.security.egd=file:/dev/./urandom","-jar","/app.jar"]
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(3) 在resource目錄下建立application.properties檔案

logging.config=classpath:logback.xml
logging.path=/home/developer/app/logs/
server.port=8990
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(4) 建立DockerApplication檔案

@SpringBootApplication
public class DockerApplication {
    public static void main(String[] args) {
        SpringApplication.run(DockerApplication.class, args);
    }
}
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(5) 建立DockerController檔案

@RestController
public class DockerController {
    static Log log = LogFactory.getLog(DockerController.class);

    @RequestMapping("/")
    public String index() {
        log.info("Hello Docker!");
        return "Hello Docker!";
    }
}
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(6) 增加配置

命令解釋
Image tag : 指定映象名稱和tag，映象名稱為 docker-demo，tag為1.1
Bind ports : 繫結宿主機埠到容器內部埠。格式為[宿主機埠]:[容器內部埠]
Bind mounts : 將宿主機目錄掛到到容器內部目錄中。格式為[宿主機目錄]:[容器內部目錄]。這個springboot專案會將日誌列印在容器 /home/developer/app/logs/ 目錄下，將宿主機目錄掛載到容器內部目錄後，那麼日誌就會持久化容器外部的宿主機目錄中。