小结

本文记录使用Dockerfile Maven Plugin 将Docker镜像Push到AWS ECR (Elastic Container Registry)，碰到了一些问题，并进行了解决。

问题解决

AWS ECR (Elastic Container Registry)的登录

使用以下AWS指令来登录AWS ECR:

[ec2-user@ip-10-0-3-241 ~]$ export AWS_ACCESS_KEY_ID="xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx..."
[ec2-user@ip-10-0-3-241 ~]$ 
[ec2-user@ip-10-0-3-241 ~]$ export AWS_SECRET_ACCESS_KEY="yyyyyyyyyyyyyyyyyyyyyyyyyyy..."
[ec2-user@ip-10-0-3-241 ~]$ 
[ec2-user@ip-10-0-3-241 ~]$ export AWS_SESSION_TOKEN="zzzzzzzzzzzzzzzzzzzzzz..."[ec2-user@ip-10-0-3-241 ~]$ aws ecr get-login-password --region ap-southeast-1 | docker login --username AWS --password-stdin 123456789012.dkr.ecr.ap-southeast-1.amazonaws.com

登录后密钥会存放主在这里~/.docker/config.json：

[ec2-user@ip-10-0-3-241 ~]$ cat ~/.docker/config.json 
{"auths": {"123456789012.dkr.ecr.ap-southeast-1.amazonaws.com": {"auth": "jjjjjjjjjjjjjjjjjjjjjjjjjjjjj..."}}
}

如果使用credHelpers ，那么~/.docker/config.json就会更新为以下：

{"credHelpers": {"<ecr-id>.dkr.ecr.<aws-region>.amazonaws.com": "ecr-login"},//...
}

问题 pull access denied for jdk, repository does not exist

问题：
DOCKER error: Pull access denied for frolvlad/alpine-oraclejdk8, repository does not exist or may require 'docker login'

可能由于仓库不存在了，这里显示jdk找不到了。

进行以下修改，原本的Dockerfile内容：

FROM frolvlad/alpine-oraclejdk8:slim
VOLUME /tmp
ADD spring-petclinic-rest-1.7.jar app.jar
RUN sh -c 'touch /app.jar'
ENV JAVA_OPTS=""
ENTRYPOINT [ "sh", "-c", "java $JAVA_OPTS -Djava.security.egd=file:/dev/./urandom -jar /app.jar" ]

修改为 openjdk，如以下，问题解决。

FROM openjdk:8
VOLUME /tmp
ADD target/spring-petclinic-rest-1.7.jar app.jar
RUN sh -c 'touch /app.jar'
ENV JAVA_OPTS=""
ENTRYPOINT [ "sh", "-c", "java $JAVA_OPTS -Djava.security.egd=file:/dev/./urandom -jar /app.jar" ]

问题 Could not acquire image ID or digest following build

Could not acquire image ID or digest following build的问题可能由以下几个原因导致：

• dockerfile-maven-plugin版本较低，需要从1.3.×升级到1.4.×即可，这已经使用了1.4.13，所以应该不是这个原因导致的。
• 需要将Dockerfile放到与`pom.xml``的根目录，进行了尝试，然而并没有解决问题。
• 那么剩下最后一个可能，Dockerfile配置错误，需要进行排查。

排查Dockerfile配置错误比较麻烦，需要使用docker指令进行测试。

[ec2-user@ip-10-0-3-241 ~]$ docker build  --file Dockerfile --tag  123456789012.dkr.ecr.ap-southeast-1.amazonaws.com/spring-petclinic-rest:1.7 .Sending build context to Docker daemon  36.96MB
Step 1/6 : FROM openjdk:8
8: Pulling from library/openjdk
001c52e26ad5: Pull complete 
d9d4b9b6e964: Pull complete 
2068746827ec: Pull complete 
9daef329d350: Pull complete 
d85151f15b66: Pull complete 
52a8c426d30b: Pull complete 
8754a66e0050: Pull complete 
Digest: sha256:86e863cc57215cfb181bd319736d0baf625fe8f150577f9eb58bd937f5452cb8
Status: Downloaded newer image for openjdk:8---> b273004037cc
Step 2/6 : VOLUME /tmp---> Running in 57e01b20a90c
Removing intermediate container 57e01b20a90c---> 0f6cbb5eebe2
Step 3/6 : ADD spring-petclinic-rest-1.7.jar app.jar
ADD failed: file not found in build context or excluded by .dockerignore: stat spring-petclinic-rest-1.7.jar: file does not exist

以上Dockerfile配置路配置有些问题，进行修改，解决问题。

使用以下指令进行Push测试：

[ec2-user@ip-10-0-3-241 ~]$ docker tag 123456789012.dkr.ecr.ap-southeast-1.amazonaws.com/spring-petclinic-rest:1.7 123456789012.dkr.ecr.ap-southeast-1.amazonaws.com/spring-petclinic-rest:latest
[ec2-user@ip-10-0-3-241 ~]$ docker images
REPOSITORY                                                                TAG            IMAGE ID       CREATED         SIZE
123456789012.dkr.ecr.ap-southeast-1.amazonaws.com/spring-petclinic-rest   1.7            251a9e43ecdb   6 hours ago     594MB
123456789012.dkr.ecr.ap-southeast-1.amazonaws.com/spring-petclinic-rest   latest         251a9e43ecdb   6 hours ago     594MB
[ec2-user@ip-10-0-3-241 ~]$ docker push 123456789012.dkr.ecr.ap-southeast-1.amazonaws.com/spring-petclinic-rest:latest
The push refers to repository [123456789012.dkr.ecr.ap-southeast-1.amazonaws.com/spring-petclinic-rest]
f07704dde9be: Layer already exists 
f93e29e9f576: Layer already exists 
6b5aaff44254: Layer already exists 
53a0b163e995: Layer already exists 
b626401ef603: Layer already exists 
9b55156abf26: Layer already exists 
293d5db30c9f: Layer already exists 
03127cdb479b: Layer already exists 
9c742cd6c7a5: Layer already exists 
latest: digest: sha256:d688043cdeaa1a28b43e6f8ede753175cbb9be02f12545df2518bf45b7502ae5 size: 2219

dockerfile-maven-plugin 使用

pom.xml记录如下：

    <properties><!-- Generic properties --><java.version>1.8</java.version><docker.registry.host>${env.docker_registry_host}</docker.registry.host><docker.image.prefix>123456789012.dkr.ecr.ap-southeast-1.amazonaws.com</docker.image.prefix><docker.image.name>${project.artifactId}</docker.image.name><docker.image.tag>${project.version}</docker.image.tag><docker.file>Dockerfile</docker.file></properties>
...<plugin><groupId>com.spotify</groupId><artifactId>dockerfile-maven-plugin</artifactId><version>1.4.13</version><configuration><!-- repository>${docker.image.prefix}/${docker.image.name}</repository --><repository>123456789012.dkr.ecr.ap-southeast-1.amazonaws.com/${project.artifactId}</repository><tag>${docker.image.tag}</tag><dockerfile>${docker.file}</dockerfile><!-- dockerfile>Dockerfile</dockerfile --><buildArgs><JAR_FILE>${project.build.finalName}.jar</JAR_FILE></buildArgs></configuration><executions><execution><id>default</id><phase>package</phase><goals><goal>build</goal><goal>push</goal></goals></execution></executions></plugin>...

运行maven指令可以成功编译并将image推送到AWS云：

mvn clean package dockerfile:build -DpushImage -Dmaven.test.skip=true

参考

Dockerfile Maven Plugin Repository
Github: Build and push docker image to Amazon from maven
Github: amazon-ecs-java-microservices/1_ECS_Java_Spring_PetClinic/
Github: spring-projects/spring-petclinic
Github: spotify/docker-maven-plugin
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