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

Centos系统下：

1. 配置（远程访问。主要是在[Service]这个部分，加上下面两个参数）
[root@ecs-dev-001 ~]# vim /usr/lib/systemd/system/docker.service
[Unit]
Description=Docker Application Container Engine
Documentation=https://docs.docker.com
After=network-online.target firewalld.service
Wants=network-online.target
[Service]
Type=notify
# the default is not to use systemd for cgroups because the delegate issues still
# exists and systemd currently does not support the cgroup feature set required
# for containers run by docker
ExecStart=/usr/bin/dockerd
ExecReload=/bin/kill -s HUP $MAINPID
# Having non-zero Limit*s causes performance problems due to accounting overhead
# in the kernel. We recommend using cgroups to do container-local accounting.
LimitNOFILE=infinity
LimitNPROC=infinity
LimitCORE=infinity
# Uncomment TasksMax if your systemd version supports it.
# Only systemd 226 and above support this version.
#TasksMax=infinity
TimeoutStartSec=0
# set delegate yes so that systemd does not reset the cgroups of docker containers
Delegate=yes
# kill only the docker process, not all processes in the cgroup
KillMode=process
# restart the docker process if it exits prematurely
Restart=on-failure
StartLimitBurst=3
StartLimitInterval=60s

ExecStart=
ExecStart=/usr/bin/dockerd -H tcp://0.0.0.0:22375 -H unix://var/run/docker.sock

2.Docker重新加载配置文件
[root@ecs-dev-001 ~]# systemctl daemon-reload
[root@ecs-dev-001 ~]# systemctl restart docker
[root@ecs-dev-001 ~]# ps -ef|grep docker
root     15373     1  0 17:59 ?        00:00:00 /usr/bin/dockerd -H tcp://0.0.0.0:22375 -H unix://var/run/docker.sock
root     15379 15373  0 17:59 ?        00:00:00 docker-containerd -l unix:///var/run/docker/libcontainerd/docker-containerd.sock --metrics-interval=0 --start-timeout 2m --state-dir /var/run/docker/libcontainerd/containerd --shim docker-containerd-shim --runtime docker-runc
root     15475 15373  0 17:59 ?        00:00:00 /usr/bin/docker-proxy -proto tcp -host-ip 0.0.0.0 -host-port 25000 -container-ip 172.17.0.2 -container-port 5000
root     15481 15379  0 17:59 ?        00:00:00 docker-containerd-shim d5b158711a40d31135a5227cb8cc9c220e4819d31eecbb527189ae7afa381c1d /var/run/docker/libcontainerd/d5b158711a40d31135a5227cb8cc9c220e4819d31eecbb527189ae7afa381c1d docker-runc
root     15499 15481  0 17:59 ?        00:00:00 registry serve /etc/docker/registry/config.yml
root     15540 15373  0 17:59 ?        00:00:00 /usr/bin/docker-proxy -proto tcp -host-ip 0.0.0.0 -host-port 8080 -container-ip 172.17.0.3 -container-port 8080
root     15546 15379  0 17:59 ?        00:00:00 docker-containerd-shim c68ccfee62efc84c4692095043b1151dec53a5ea0b676510c59116133de94975 /var/run/docker/libcontainerd/c68ccfee62efc84c4692095043b1151dec53a5ea0b676510c59116133de94975 docker-runc
root     15618 15207  0 17:59 pts/1    00:00:00 grep --color=auto 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

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

5.1 新建Dockerfile文件

FROM registry.cn-hangzhou.aliyuncs.com/acs/maven:3-jdk-8

MAINTAINER zhouping "[email protected]"
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

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

<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

<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

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：

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

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>

将maven打包后的镜像PUSH到远程私有仓库，需要配置系统变量，否则无法PUSH成功，配置完成后需要重启系统生效

DOCKER_HOST = tcp://139.159.158.113:22375

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