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在上一篇文章中我们介绍了在Jenkinsfile中使用dockerfile来动态生成镜像，从而在指定的阶段进行使用。而对于将构建生成的二进制应用进行容器化，比如将spring boot应用的jar文件打包生成一个基于JRE或者JDK基础的镜像，这个可以使用docker.build来实现，这篇文章将继续结合示例来进行介绍。

环境准备

本文使用Easypack的LTS Jenkins 2.176.1版，环境准备请参看

• https://liumiaocn.blog.csdn.net/article/details/92764938

Registry 准备：

执行命令：docker run -d -p 5000:5000 registry

使用docker ps确认私库管理的容器已经启动

liumiaocn:docker liumiao$ docker ps |grep registry06601f2782c0        registry                     "/entrypoint.sh /etc…"   About a minute ago   Up About a minute   0.0.0.0:5000->5000/tcp                              cocky_murdockliumiaocn:docker liumiao$

获取Jenkins-Crumb

使用如下示例代码获取Jenkins-Crumb,为使用API方式为示例作准备。

liumiaocn:jenkins liumiao$ jenkins_host_url=http://localhost:32002liumiaocn:jenkins liumiao$ user_passwd="root:liumiaocn"liumiaocn:jenkins liumiao$ jenkins_crumb=`curl -u $user_passwd ${
    jenkins_host_url}'/crumbIssuer/api/xml?xpath=concat(//crumbRequestField,":",//crumb)' 2>/dev/null`liumiaocn:jenkins liumiao$ echo $jenkins_crumbJenkins-Crumb:6af0183fd58dea3d16f393b9e3272747liumiaocn:jenkins liumiao$

创建Job

使用如下代码示例创建Job

liumiaocn:jenkins liumiao$ ls demo/pipeline/docker/registry/config.xmldemo/pipeline/docker/registry/config.xmlliumiaocn:jenkins liumiao$ cat demo/pipeline/docker/registry/config.xml
   
     
        
       
      
    
     Pipeline Job Sample
      
    
     false
      
        
         
           
          
       
      
      
       
     
      false
       
      
      
    
     false
    
   liumiaocn:jenkins liumiao$ curl -X POST -u $user_passwd -H ${jenkins_crumb} -H "Content-Type:application/xml"  --data-binary  "@demo/pipeline/docker/registry/config.xml" ${jenkins_host_url}/createItem?name=pipeline_job_registryliumiaocn:jenkins liumiao$ echo $?0liumiaocn:jenkins liumiao$

注：MYPASSWORD在实际运行是需要改成自己的密码，前面的liumiaocn是我的dockerhub的账号。

Jenkinsfile说明

本文示例所使用的Jenkinsfile信息如下所示，内容非常简单易读，简单说明如下：

• node是结构，在其中可以指定stage等信息
• stage为具体的节点，比如本文示例中模拟实际的准备Dockerfile、构建镜像等操作
• 本示例中使用了两种镜像推送的方式，第一种直接推送到前文准备的registry中，第二种推送到dockerhub上。

node {       stage('Prepare Dockerfile') {        sh 'cp /tmp/Dockerfile .'        }       stage('Build image and push to local registry') {         docker.withRegistry('http://192.168.31.242:5000') {           def nginx_img = docker.build('my-nginx:v1')           nginx_img.push()         }       }        stage('Build image and push to dockerhub ') {          sh 'docker login -u liumiaocn -p MYPASSWORD'          sh 'docker tag my-nginx:v1 liumiaocn/my-nginx:v1'          sh 'docker push liumiaocn/my-nginx:v1'       }  }

执行Job

• Dockerfile准备
  Dockerfile内容如下所示

liumiaocn:jenkins liumiao$ docker exec -it jenkins_jenkins_1 sh/ # cat /tmp/Dockerfile FROM nginx:latest/ #

• 事前确认

liumiaocn:jenkins liumiao$ docker images |grep my-nginxliumiaocn:jenkins liumiao$

使用如下命令或者直接在Jenkins上点击构建

liumiaocn:jenkins liumiao$ curl -X POST -u $user_passwd -H ${jenkins_crumb} ${jenkins_host_url}/job/pipeline_job_registry/buildliumiaocn:jenkins liumiao$ echo $?0liumiaocn:jenkins liumiao$

确认执行结果

使用如下命令可以确认相关的执行日志信息

liumiaocn:jenkins liumiao$ curl -u $user_passwd ${jenkins_host_url}/job/pipeline_job_registry/1/consoleTextStarted by user rootRunning in Durability level: MAX_SURVIVABILITY[Pipeline] Start of Pipeline[Pipeline] nodeRunning on Jenkins in /data/jenkins/workspace/pipeline_job_registry[Pipeline] {
   [Pipeline] stage[Pipeline] {
    (Prepare Dockerfile)[Pipeline] sh+ cp /tmp/Dockerfile .[Pipeline] }[Pipeline] // stage[Pipeline] stage[Pipeline] {
    (Build image and push to local registry)[Pipeline] withEnv[Pipeline] {
   [Pipeline] withDockerRegistry[Pipeline] {
   [Pipeline] sh+ docker build -t my-nginx:v1 .Sending build context to Docker daemon  2.048kBStep 1/1 : FROM nginx:latestlatest: Pulling from library/nginx8d691f585fa8: Pulling fs layer047cb16c0ff6: Pulling fs layerb0bbed1a78ca: Pulling fs layerb0bbed1a78ca: Verifying Checksumb0bbed1a78ca: Download complete047cb16c0ff6: Verifying Checksum047cb16c0ff6: Download complete8d691f585fa8: Verifying Checksum8d691f585fa8: Download complete8d691f585fa8: Pull complete047cb16c0ff6: Pull completeb0bbed1a78ca: Pull completeDigest: sha256:77ebc94e0cec30b20f9056bac1066b09fbdc049401b71850922c63fc0cc1762eStatus: Downloaded newer image for nginx:latest ---> 5a9061639d0aSuccessfully built 5a9061639d0aSuccessfully tagged my-nginx:v1[Pipeline] dockerFingerprintFrom[Pipeline] sh+ docker tag my-nginx:v1 192.168.31.242:5000/my-nginx:v1[Pipeline] sh+ docker push 192.168.31.242:5000/my-nginx:v1The push refers to repository [192.168.31.242:5000/my-nginx]cf2436e84ea8: Preparinged4a4820ee08: Preparingb67d19e65ef6: Preparingcf2436e84ea8: Pusheded4a4820ee08: Pushedb67d19e65ef6: Pushedv1: digest: sha256:224f1b76ad5d6d5878c2dccba5b3dcc8e9a263ff04efdf0f8e0ef8f68c208a44 size: 948[Pipeline] }[Pipeline] // withDockerRegistry[Pipeline] }[Pipeline] // withEnv[Pipeline] }[Pipeline] // stage[Pipeline] stage[Pipeline] {
    (Build image and push to dockerhub )[Pipeline] sh+ docker login -u liumiaocn -p MYPASSWORDWARNING! Using --password via the CLI is insecure. Use --password-stdin.WARNING! Your password will be stored unencrypted in /root/.docker/config.json.Configure a credential helper to remove this warning. Seehttps://docs.docker.com/engine/reference/commandline/login/#credentials-storeLogin Succeeded[Pipeline] sh+ docker tag my-nginx:v1 liumiaocn/my-nginx:v1[Pipeline] sh+ docker push liumiaocn/my-nginx:v1The push refers to repository [docker.io/liumiaocn/my-nginx]cf2436e84ea8: Preparinged4a4820ee08: Preparingb67d19e65ef6: Preparingb67d19e65ef6: Mounted from library/nginxcf2436e84ea8: Mounted from library/nginxed4a4820ee08: Mounted from library/nginxv1: digest: sha256:224f1b76ad5d6d5878c2dccba5b3dcc8e9a263ff04efdf0f8e0ef8f68c208a44 size: 948[Pipeline] }[Pipeline] // stage[Pipeline] }[Pipeline] // node[Pipeline] End of PipelineFinished: SUCCESSliumiaocn:jenkins liumiao$

blueocean构建结果确认

构建后镜像确认

liumiaocn:jenkins liumiao$ docker images |grep my-nginx192.168.31.242:5000/my-nginx                    v1                              5a9061639d0a        2 days ago          126MBmy-nginx                                        v1                              5a9061639d0a        2 days ago          126MBliumiaocn/my-nginx                              v1                              5a9061639d0a        2 days ago          126MBliumiaocn:jenkins liumiao$

• Dockerhub镜像确认
  

注意事项

环境准备的docker-compose.yml中需要包含如下内容，以保证能够以容器方式运行的Jenkins能够进行镜像的生成。

另外，需要将registry的内容进行设定，否则在push时会出现下列类似的错误信息

Get https://192.168.31.242:5000/v2/: http: server gave HTTP response to HTTPS client

对应方法：

{ "insecure-registries":["192.168.31.242:5000"] }

在macOS上，则可以直接在GUI页面设定之后Apply，然后重启docker服务即可

参考内容

https://jenkins.io/doc/book/pipeline/docker/

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