Docker与微服务

Docker与微服务-使用Maven插件构建Docker镜像

1. Docker与微服务-使用Maven插件构建Docker镜像

前提:自己搭建的私有Docker仓库需要开放远程API端口,要不然你无法推送镜像到私有仓库下,开放Docker远程私有仓库端口步骤:
Ubuntu系统下:
1. 配置
$ sudo vim /lib/systemd/system/docker.service
修改ExecStart一行,改为:
ExecStart=/usr/bin/docker -H fd:// -H tcp://0.0.0.0:22375
2. 重启Docker服务
$ sudo systemctl daemon-reload
$ sudo systemctl restart docker
3. 测试
curl http://localhost:22375/version

注意:如果遇到错误信息 Get https://192.168.0.11:5000/v1/_ping: http: server gave HTTP response to HTTPS client

解决办法

在”/etc/docker/“目录下,创建”daemon.json“文件。在文件中写入:

    {
        "insecure-registries": [
            "192.168.0.11:5000"
        ]
    }
    //多个私服写法,逗号分隔即可
    {
        "insecure-registries": [
            "192.168.0.12:5000",
            "192.168.0.11:5000"
        ]
    }
重启DOCKER
systemctl restart docker
Windows环境配置环境变量 DOCKER_HOST : tcp://192.168.0.11:22375

2.工具

插件名称 官方地址
docker-maven-plugin https://github.com/spotify/docker-maven-plugin
docker-maven-plugin https://github.com/fabric8io/docker-maven-plugin
docker-maven-plugin https://github.com/bibryam/docker-maven-plugin

3.使用插件构建Docker镜像

4.简单使用

使用springbootdemo构建
4.1 pom.xml添加以下配置
<build>
    <plugins>
        <!-- docker的maven插件,官网:https://github.com/spotify/docker-maven-plugin -->
        <plugin>
            <groupId>com.spotify</groupId>
            <artifactId>docker-maven-plugin</artifactId>
            <version>0.4.13</version>
            <configuration>
                <!-- 注意imageName一定要是符合正则[a-z0-9-_.]的,否则构建不会成功 -->
                <!-- 详见:https://github.com/spotify/docker-maven-plugin    Invalid repository name ... only [a-z0-9-_.] are allowed-->
                <imageName>zhouping/springbootdemo</imageName>
                <baseImage>java</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>
4.2 执行命令
4.2 执行命令
mvn clean package docker:build
docker images --显示镜像列表
启动镜像
docker run -p 8761:8761 microservice-discovery-eureka

5.使用Dockerfile进行构建

5.使用Dockerfile进行构建

5.1 新建Dockerfile文件
FROM registry.cn-hangzhou.aliyuncs.com/acs/maven:3-jdk-8

MAINTAINER zhouping "zhouping19911013@163.com"
MAINTAINER version "online"

EXPOSE 8089

VOLUME /tmp
ADD springboot.jar app.jar
ENTRYPOINT ["java","-Djava.security.egd=file:/dev/./urandom","-jar","/app.jar"]
5.2 说明
5.2 说明
FROM registry.cn-hangzhou.aliyuncs.com/acs/maven:3-jdk-8
由于下载国外镜像很慢,添加阿里镜像地址
5.3 修改pom.xml
5.3 修改pom.xml
<build>
    <plugins>
        <!-- docker的maven插件,官网:https://github.com/spotify/docker-maven-plugin -->
        <plugin>
            <groupId>com.spotify</groupId>
            <artifactId>docker-maven-plugin</artifactId>
            <version>0.4.13</version>
            <configuration>
                <!-- 注意imageName一定要是符合正则[a-z0-9-_.]的,否则构建不会成功 -->
                <!-- 详见:https://github.com/spotify/docker-maven-plugin    Invalid repository name ... only [a-z0-9-_.] are allowed-->
                <imageName>zhouping/springbootdemo</imageName>
                <!-- 指定Dockerfile所在的路径 -->
                <dockerDirectory>${project.basedir}/docker</dockerDirectory>
                <resources>
                    <resource>
                        <targetPath>/</targetPath>
                        <directory>${project.build.directory}</directory>
                        <include>${project.build.finalName}.jar</include>
                    </resource>
                </resources>
            </configuration>
        </plugin>
    </plugins>
</build>

6.将Docker镜像push到DockerHub上

首先修改Maven的全局配置文件settings.xml,添加以下段落
<servers>
  <server>
    <id>docker-hub</id>
    <username>你的DockerHub用户名</username>
    <password>你的DockerHub密码</password>
    <configuration>
      <email>你的DockerHub邮箱</email>
    </configuration>
  </server>
</servers>
项目pom.xml修改为如下:注意imageName的路径要和repo的路径一致
项目pom.xml修改为如下:注意imageName的路径要和repo的路径一致
<build>
    <plugins>
        <!-- docker的maven插件,官网:https://github.com/spotify/docker-maven-plugin -->
        <plugin>
            <groupId>com.spotify</groupId>
            <artifactId>docker-maven-plugin</artifactId>
            <version>0.4.12</version>
            <configuration>
                <!-- 注意imageName一定要是符合正则[a-z0-9-_.]的,否则构建不会成功 -->
                <!-- 详见:https://github.com/spotify/docker-maven-plugin Invalid repository
                    name ... only [a-z0-9-_.] are allowed -->
                <!-- 如果要将docker镜像push到DockerHub上去的话,这边的路径要和repo路径一致 -->
                <imageName>zping/test</imageName>
                <!-- 指定Dockerfile所在的路径 -->
                <dockerDirectory>${project.basedir}/docker</dockerDirectory>
                <resources>
                    <resource>
                        <targetPath>/</targetPath>
                        <directory>${project.build.directory}</directory>
                        <include>${project.build.finalName}.jar</include>
                    </resource>
                </resources>
                <!-- 以下两行是为了docker push到DockerHub使用的。 -->
                <serverId>docker-hub</serverId>
                <registryUrl>https://index.docker.io/v1/</registryUrl>
            </configuration>
        </plugin>
    </plugins>
</build>
执行命令
mvn clean package docker:build  -DpushImage

7.将镜像push到私有仓库

7.将镜像push到私有仓库

修改maven全局配置文件settings.xml
<servers>
  <server>
    <id>docker-registry</id>
    <username>你的DockerHub用户名</username>
    <password>你的DockerHub密码</password>
    <configuration>
      <email>你的DockerHub邮箱</email>
    </configuration>
  </server>
</servers>
修改pom文件
<plugin>
  <groupId>com.spotify</groupId>
  <artifactId>docker-maven-plugin</artifactId>
  <version>0.4.12</version>
  <configuration>
    <!-- 路径为:私有仓库地址/你想要的镜像路径 -->
    <imageName>zhouping/springbootdemo</imageName>
    <dockerDirectory>${project.basedir}/src/main/docker</dockerDirectory>
    <resources>
      <resource>
        <targetPath>/</targetPath>
        <directory>${project.build.directory}</directory>
        <include>${project.build.finalName}.jar</include>
      </resource>
    </resources>
    <!-- 与maven配置文件settings.xml一致 -->
    <serverId>docker-registry</serverId>
  </configuration>
</plugin>
执行
mvn clean package docker:build  -DpushImage
如果想要从私服上下载该镜像,执行:
如果想要从私服上下载该镜像,执行:
docker login reg.itmuch.com  # 然后输入账号和密码
docker pull reg.itmuch.com/test-pull-registry
8.将插件绑定在某个phase执行
    只需要将插件的goal 绑定在某个phase即可,所谓的phase和goal,可以这样理解:maven命令格式是:mvn phase:goal ,例如mvn package docker:build 那么,package 和 docker 都是phase,build 则是goal
修改pom.xml文件
 <build>
    <plugins>
      <plugin>
        <groupId>com.spotify</groupId>
        <artifactId>docker-maven-plugin</artifactId>
        <executions>
          <execution>
            <id>build-image</id>
            <phase>package</phase>
            <goals>
              <goal>build</goal>
            </goals>
          </execution>
        </executions>
        <configuration>
          <imageName>${docker.image.prefix}/${project.artifactId}</imageName>
          <baseImage>java</baseImage>
          <entryPoint>["java", "-jar", "/${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>
如上,我们只需添加
<executions>
  <execution>
    <id>build-image</id>
    <phase>package</phase>
    <goals>
      <goal>build</goal>
    </goals>
  </execution>
</executions>

9.常见异常

9.常见异常

连接不上2375一般在Win7上出现
Connect to localhost:2375 [localhost/127.0.0.1, localhost/0:0:0:0:0:0:0:1] failed: Connection refused: connect -> [Help 1]
解决步骤:
docker-machine env
$Env:DOCKER_TLS_VERIFY = "1"
$Env:DOCKER_HOST = "tcp://192.168.99.100:2376"
$Env:DOCKER_CERT_PATH = "C:\Users\Administrator\.docker\machine\machines\default
pom.xml文件中为插件添加配置
<!-- 解决Connect to localhost:2375的问题的其中一种方式,注意要跟docker-machine env相一致 -->
<dockerHost>https://192.168.99.100:2376</dockerHost>
<dockerCertPath>C:\Users\Administrator\.docker\machine\machines\default</dockerCertPath>
修改后pom.xml
<plugin>
    <groupId>com.spotify</groupId>
    <artifactId>docker-maven-plugin</artifactId>
    <version>0.4.12</version>
    <configuration>
        <imageName>eacdy/test</imageName>
        <dockerDirectory>${project.basedir}/src/main/docker</dockerDirectory>

        <!-- 解决Connect to localhost:2375的问题的其中一种方式,注意要跟docker-machine env相一致 -->
        <dockerHost>https://192.168.99.100:2376</dockerHost>
        <dockerCertPath>C:\Users\Administrator\.docker\machine\machines\default</dockerCertPath>
        <resources>
            <resource>
                <targetPath>/</targetPath>
                <directory>${project.build.directory}</directory>
                <include>${project.build.finalName}.jar</include>
            </resource>
        </resources>
        <!-- 以下两行是为了docker push到DockerHub使用的。 -->
        <serverId>docker-hub</serverId>
        <registryUrl>https://index.docker.io/v1/</registryUrl>
    </configuration>
</plugin>

11.TIPS

11.TIPS

1. imageName必须符合正则[a-z0-9-_.],否则将会构建失败
2. 插件默认使用localhost:2375去连接Docker,如果你的Docker端口不是2375,需要配置环境变量DOCKER_HOST=tcp://:2375

12.代码地址任选其一

https://github.com/thestar111/springbootdemo.git

13.参考文档

1. http://developer.51cto.com/art/201404/434879.html
2. https://linux.cn/article-6131-rss.html

14. 国内镜像仓库加速地址

1. https://eo17c4cg.mirror.aliyuncs.com
2. http://ab971fb4.m.daocloud.io

Docker Toolbox

docker-machine ssh default
sudo sed -i "s|EXTRA_ARGS='|EXTRA_ARGS='--registry-mirror=加速地址 |g" /var/lib/boot2docker/profile
exit
docker-machine restart default

Docker for Windows

在桌面右下角状态栏中右键 docker 图标,修改在 Docker Daemon 标签页中的 json ,把 加速地址(在加速器页面获取)加到"registry-mirrors"的数组里。点击 Apply 使设置生效


Author: Juntech
Reprint policy: All articles in this blog are used except for special statements CC BY 4.0 reprint polocy. If reproduced, please indicate source Juntech !
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