Spring Cloud教程八:Docker(容器化部署)

文章目录
  1. 1. 仅用插件打镜像
  2. 2. Dockerfile打镜像
  3. 3. 使用docker compose部署已有镜像服务

对于Docker的概念和操作可以看之前的文章:

在进行实操前,先要在个人电脑安装Docker环境,没有环境的可以点这里根据教程装环境。

仅用插件打镜像

这里的项目基于Spring Cloud 教程一:Eureka这一篇构建的项目基础上展开:

修改eureka-service的defaultZone配置, 这里不能使用localhost,可以使用ip地址,也可之使用hosts文件中配置的主机,这里直接使用ip地址:

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server:
port: 9090

eureka:
instance:
hostname: localhost
client:
register-with-eureka: false
fetch-registry: false
service-url:
defaultZone: http://192.168.30.5:9090/eureka

在pom.xml中添加插件配置:

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<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>0.4.13</version>
<configuration>
<imageName>${project.artifactId}:${project.version}</imageName>
<baseImage>openjdk:11-jre-slim</baseImage>
<entryPoint>["java", "-jar", "/${project.build.finalName}.jar"]</entryPoint>
<resources>
<resource>
<targetPath>/</targetPath>
<directory>${project.build.directory}</directory>
<include>${project.build.finalName}.jar</include>
</resource>
</resources>
</configuration>
</plugin>
</plugins>
</build>

配置完成后,在控制台运行命令

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mvn clean package docker:build

如果控制台报这个错误:

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No plugin found for prefix 'docker' in the current project and in the plugin groups [org.apache.maven.plugins, org.codehaus.mojo] available from the repositories [local (e:\maven\repository), nexus (https://nexus.nroad.com.cn/repository/maven-public)] -> [Help 1]

请在maven的配置文件中添加下面内容:

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<settings>
<pluginGroups>
<pluginGroup>com.spotify</pluginGroup>
</pluginGroups>
</settings>

获取部分打包日志如下:

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Pulling from library/openjdk
8d691f585fa8: Pull complete
3da6fe7ff2ef: Pull complete
e22147996cc0: Pull complete
8df48a2d4467: Pull complete
Digest: sha256:d7593b97425e5faaa67d1c556b6b9f6b18282ba73640206bfdc73f65f7245fa0
Status: Downloaded newer image for openjdk:11-jre-slim
---> 0e452dba629c
Step 2/3 : ADD /eureka-server-0.0.1-SNAPSHOT.jar //

---> ad4570bb025a
Step 3/3 : ENTRYPOINT ["java", "-jar", "/eureka-server-0.0.1-SNAPSHOT.jar"]

---> Running in fbdd61b36a8a
Removing intermediate container fbdd61b36a8a
---> ce64f5b52ae4
ProgressMessage{id=null, status=null, stream=null, error=null, progress=null, progressDetail=null}
Successfully built ce64f5b52ae4
Successfully tagged eureka-server:0.0.1-SNAPSHOT

构建成功后,控制台执行docker images查看是否有刚刚构建的镜像。

启动新构建的镜像:

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docker run -p 9090:9090 eureka-server:0.0.1-SNAPSHOT

浏览器查看 http://localhost:9090

Dockerfile打镜像

上面演示了如何直接用插件构建Docker镜像, 接下来我们采用更有可读性的Dockerfile来构建Docker镜像。

修改eureka-client的defaultZone配置, 这里不能使用localhost,直接使用ip地址:

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server:
port: 8040

eureka:
client:
service-url:
defaultZone: http://192.168.30.5:9090/eureka/

spring:
application:
name: erueka-client

在pom.xml中添加插件配置:

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<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>0.4.13</version>
<configuration>
<imageName>${project.artifactId}:${project.version}</imageName>
<dockerDirectory>${project.basedir}/src/main/docker</dockerDirectory>
<resources>
<resource>
<targetPath>/</targetPath>
<directory>${project.build.directory}</directory>
<include>${project.build.finalName}.jar</include>
</resource>
</resources>
</configuration>
</plugin>
</plugins>
</build>

这里的dockerDirectory是配置Dockerfile文件的位置。

在src/main/docker下新建Dockerfile文件,内容如下:

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FROM openjdk:11-jre-slim
VOLUME /tmp
ADD eureka-client-0.0.1-SNAPSHOT.jar app.jar
ENTRYPOINT ["java","-Djava.security.egd=file:/dev/./urandom","-jar","/app.jar"]

和直接使用插件一样构建镜像,并且启动镜像:

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mvn clean package docker:build
docker run -p 8040:8040 eureka-client:0.0.1-SNAPSHOT

然后看eureka-service的页面是否已经注册上。

使用docker compose部署已有镜像服务

使用docker compose来编排部署微服务, 可以统一管理,避免单独部署的麻烦。

新建docker-compose.yml文件, 内容如下:

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version: "3"
services:
eureka-server:
image: eureka-server:0.0.1-SNAPSHOT
ports:
- 9090:9090
eureka-client:
image: eureka-client:0.0.1-SNAPSHOT
ports:
- 8040:8040
depends_on:
- eureka-server

在文件所在目录执行命令

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docker-compose up

查看 http://localhost:9090 , 检查eureka-client是否注册上。

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