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使用jib打包docker鏡像實戰(zhàn)

序

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本文主要研究一下如何使用google的jib打包docker鏡像

Jib 是谷歌最新開源的 Java 應用的 Docker 鏡像生成工具，可以通過 Gradle 或 Maven 直接生成鏡像并上傳到倉庫而不需要 Dockerfile 文件或者其他插件；Jib 支持將資源文件和類分層打包，可以大幅度提升生成鏡像的速度

有一些其他的插件也可以通過 Docker 實現(xiàn)生成鏡像，如com.palantir.docker等，但是都需要額外配置 Dockerfile, 如果應用僅需要通過 Dockerfile 構建鏡像，建議使用 Jib 來提升構建和上傳速度

maven

      
        com.google.cloud.tools
        jib-maven-plugin
        0.9.9

配置

  
    UTF-8
    UTF-8
    1.8
    yyyyMMdd
  


  
    
      
        org.springframework.boot
        spring-boot-maven-plugin
      
      
        com.google.cloud.tools
        jib-maven-plugin
        0.9.9
        
          
            
              -Xms512m
            
            
              8080
            
            true
          
          
            java:8u172-jre-alpine
          
          
            jib-demo:${maven.build.timestamp}
          
          true
          ${project.basedir}/src/main/jib

這里指定base image為java:8u172-jre-alpine

同時指定生成的image名稱為jib-demo:${maven.build.timestamp}

container標簽可以指定相關參數(shù)，比如jvmFlags指定JVM參數(shù)，ports指定expose的端口號

extraDirectory用于指定要添加的目錄，默認為${project.basedir}/src/main/jib，即該目錄下的文件夾會在docker鏡像里頭同步創(chuàng)建，目錄層級關系以jib下目錄層級關系為準。比如該目錄下有app/resources/demo.txt，則對應該鏡像目錄為/app/resources/demo.txt

打包

mvn compile jib:dockerBuild -X

使用jib:dockerBuild是在本地打包鏡像，不push到遠程，-X參數(shù)是顯示debug信息

如果使用jib:build命令，則打包之后push到遠程

輸出日志實例：

[DEBUG] TIMING  Building image to Docker daemon
[DEBUG] RUNNING  Building image to Docker daemon
[INFO] Getting base image java:8u172-jre-alpine...
[DEBUG] TIMING  Pulling base image manifest
[DEBUG] RUNNING  Pulling base image manifest
[DEBUG] TIMING  Building application layers
[DEBUG] RUNNING  Building application layers
[INFO] Building dependencies layer...
[DEBUG] TIMING  Building dependencies layer
[DEBUG] RUNNING  Building dependencies layer
[INFO] Building resources layer...
[DEBUG] TIMING  Building resources layer
[DEBUG] RUNNING  Building resources layer
[INFO] Building classes layer...
[DEBUG] TIMING  Building classes layer
[DEBUG] RUNNING  Building classes layer
[INFO] Building extra files layer...
[DEBUG] TIMING  Building extra files layer
[DEBUG] RUNNING  Building extra files layer
[DEBUG] TIMED  Building application layers : 3.498 ms
[DEBUG] Building application layers : 3.498 ms
[DEBUG] Building extra files layer built sha256:0a9321c621ee2c138d9a93f4ba47f825e20dd7aca0e9206f30bf560122fdaa31
[DEBUG] Building resources layer built sha256:933116c8da4db70000355b750af2f3b5c4545e74db7b5eb0a5e37689ef86d44f
[DEBUG] Building classes layer built sha256:a99dbde7d015ba3d15b9265ac38f6536d65b00dd2a864b7003a34742f483939b
[DEBUG] TIMED  Building extra files layer : 33.718 ms
[DEBUG] TIMED  Building classes layer : 33.901 ms
[DEBUG] Building extra files layer : 33.718 ms
[DEBUG] TIMED  Building resources layer : 34.062 ms
[DEBUG] Building resources layer : 34.062 ms
[DEBUG] Building classes layer : 33.901 ms
[DEBUG] Building dependencies layer built sha256:a19961ec08095eb70ca3a070945223dcf51500a255a745272276139bf0a29f4e
[DEBUG] TIMED  Building dependencies layer : 1047.83 ms
[DEBUG] Building dependencies layer : 1047.83 ms
[INFO] The base image requires auth. Trying again for java:8u172-jre-alpine...
//......
[DEBUG] TIMED  Pulling base image manifest : 8959.891 ms
[DEBUG] Pulling base image manifest : 8959.891 ms
[DEBUG] TIMING  Setting up base image caching
[DEBUG] RUNNING  Setting up base image caching
[DEBUG] TIMED  Setting up base image caching : 0.824 ms
[DEBUG] Setting up base image caching : 0.824 ms
[DEBUG] TIMING  Pulling base image layer sha256:500c0ac4cdc58aee9a008e70466eeec8a4b74b25c29d003764635d2fe1b42827
[DEBUG] RUNNING  Pulling base image layer sha256:500c0ac4cdc58aee9a008e70466eeec8a4b74b25c29d003764635d2fe1b42827
[DEBUG] TIMING  Pulling base image layer sha256:aa38cd8c77d7320c7489327775e074580db5f23467198aab3e79c7db5cdfbdca
[DEBUG] TIMING  Pulling base image layer sha256:cb56d62302ec31640b40ca15843e7af6be145966a1064c78ea7afd6f10ce49e6
[DEBUG] RUNNING  Pulling base image layer sha256:cb56d62302ec31640b40ca15843e7af6be145966a1064c78ea7afd6f10ce49e6
[DEBUG] TIMING  Pulling base image layer sha256:ff3a5c916c92643ff77519ffa742d3ec61b7f591b6b7504599d95a4a41134e28
[DEBUG] RUNNING  Pulling base image layer sha256:ff3a5c916c92643ff77519ffa742d3ec61b7f591b6b7504599d95a4a41134e28
[DEBUG] RUNNING  Pulling base image layer sha256:aa38cd8c77d7320c7489327775e074580db5f23467198aab3e79c7db5cdfbdca
[DEBUG] TIMED  Pulling base image layer sha256:500c0ac4cdc58aee9a008e70466eeec8a4b74b25c29d003764635d2fe1b42827 : 612.524 ms
[DEBUG] Pulling base image layer sha256:500c0ac4cdc58aee9a008e70466eeec8a4b74b25c29d003764635d2fe1b42827 : 612.524 ms
[DEBUG] TIMED  Pulling base image layer sha256:ff3a5c916c92643ff77519ffa742d3ec61b7f591b6b7504599d95a4a41134e28 : 9985.702 ms
[DEBUG] Pulling base image layer sha256:ff3a5c916c92643ff77519ffa742d3ec61b7f591b6b7504599d95a4a41134e28 : 9985.702 ms
[DEBUG] TIMED  Pulling base image layer sha256:aa38cd8c77d7320c7489327775e074580db5f23467198aab3e79c7db5cdfbdca : 27267.144 ms
[DEBUG] Pulling base image layer sha256:aa38cd8c77d7320c7489327775e074580db5f23467198aab3e79c7db5cdfbdca : 27267.144 ms
[DEBUG] TIMED  Pulling base image layer sha256:cb56d62302ec31640b40ca15843e7af6be145966a1064c78ea7afd6f10ce49e6 : 54734.971 ms
[DEBUG] Pulling base image layer sha256:cb56d62302ec31640b40ca15843e7af6be145966a1064c78ea7afd6f10ce49e6 : 54734.971 ms
[DEBUG] TIMING  Building container configuration
[DEBUG] RUNNING  Building container configuration
[INFO] Finalizing...
[DEBUG] TIMED  Building container configuration : 0.462 ms
[DEBUG] Building container configuration : 0.462 ms
[INFO] Loading to Docker daemon...
[DEBUG] TIMED  Building image to Docker daemon : 65862.956 ms
[DEBUG] Building image to Docker daemon : 65862.956 ms
[INFO]
[INFO] Container entrypoint set to [java, -Xms512m, -cp, /app/resources/:/app/classes/:/app/libs/*, com.example.JibDemoApplication]
[INFO]
[INFO] Built image to Docker daemon as jib-demo:20180826
[INFO]
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 01:07 min
[INFO] Finished at: 2018-08-26T21:38:11+08:00
[INFO] Final Memory: 26M/493M
[INFO] ------------------------------------------------------------------------

查看鏡像

docker inspect jib-demo:20180826
[
  {
    "Id": "sha256:7554492dde84091bc6d015b29ec4bf854bb841b9ec4d8f7bef8b51a8ec59ef94",
    "RepoTags": [
      "jib-demo:20180826"
    ],
    "RepoDigests": [],
    "Parent": "",
    "Comment": "",
    "Created": "2018-08-26T13:37:05.65Z",
    "Container": "",
    "ContainerConfig": {
      "Hostname": "",
      "Domainname": "",
      "User": "",
      "AttachStdin": false,
      "AttachStdout": false,
      "AttachStderr": false,
      "Tty": false,
      "OpenStdin": false,
      "StdinOnce": false,
      "Env": null,
      "Cmd": null,
      "Image": "",
      "Volumes": null,
      "WorkingDir": "",
      "Entrypoint": null,
      "OnBuild": null,
      "Labels": null
    },
    "DockerVersion": "",
    "Author": "",
    "Config": {
      "Hostname": "",
      "Domainname": "",
      "User": "",
      "AttachStdin": false,
      "AttachStdout": false,
      "AttachStderr": false,
      "ExposedPorts": {
        "8080/tcp": {}
      },
      "Tty": false,
      "OpenStdin": false,
      "StdinOnce": false,
      "Env": [
        "PATH=/opt/jdk1.8.0_172/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin",
        "JAVA_HOME=/opt/jdk1.8.0_172"
      ],
      "Cmd": [],
      "Image": "",
      "Volumes": null,
      "WorkingDir": "",
      "Entrypoint": [
        "java",
        "-Xms512m",
        "-cp",
        "/app/resources/:/app/classes/:/app/libs/*",
        "com.example.JibDemoApplication"
      ],
      "OnBuild": null,
      "Labels": {}
    },
    "Architecture": "amd64",
    "Os": "linux",
    "Size": 186079594,
    "VirtualSize": 186079594,
    "GraphDriver": {
      "Data": null,
      "Name": "aufs"
    },
    "RootFS": {
      "Type": "layers",
      "Layers": [
        "sha256:cd7100a72410606589a54b932cabd804a17f9ae5b42a1882bd56d263e02b6215",
        "sha256:317e0b42ef29551507adc792c2dbc389af85c5d68900cf0f08abe907cbd4e199",
        "sha256:d6fd5302a9ee64c43b46153e9678153819d6d0e247381acbbe6cbe6ed9de0366",
        "sha256:417c6bd0930eb69d17ae5d601898a6a012900ca33c69e612840a3042b2451cbb",
        "sha256:8309a5eed5158c5639acb664312ddc7027a2ecb172744f548d6d9fb5f918a744",
        "sha256:6ef8c795d7a5e2a07f51d572a90b820e089f89adf30798193f4f3f410a261415",
        "sha256:9990447f3d37e3f2dc70718d0ea6602cf7843091d8bbe395f552c9c5dd10551c",
        "sha256:ff7910aaeee962d1d86e00742030378a2758da59d8c8cda3fe44314bbddd8081"
      ]
    },
    "Metadata": {
      "LastTagTime": "0001-01-01T00:00:00Z"
    }
  }
]

可以看到java -cp指定了/app/libs/、/app/resources/、/app/classes/這三個文件夾

小結

jib默認執(zhí)行如下操作

COPY libs /app/libs/
COPY resources /app/resources/
COPY classes /app/classes/

也就是將libs拷貝到/app/libs，將resources拷貝到/app/resources，將classes拷貝到/app/classes.

doc

  • jib
  • Building Docker Image for a Spring Boot App With Jib
  • build-containers-faster-with-jib-a-google-image-build-tool-for-java-applications

以上就是本文的全部內(nèi)容，希望對大家的學習有所幫助，也希望大家多多支持創(chuàng)新互聯(lián)。


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