使用jib打包docker镜像实战

序

本文主要研究一下如何使用google的jib打包docker镜像

Jib 是谷歌最新开源的 Java 应用的 Docker 镜像生成工具，可以通过 Gradle 或 Maven 直接生成镜像并上传到仓库而不需要 Dockerfile 文件或者其他插件；Jib 支持将资源文件和类分层打包，可以大幅度提升生成镜像的速度

有一些其他的插件也可以通过 Docker 实现生成镜像，如com.palantir.docker等，但是都需要额外配置 Dockerfile, 如果应用仅需要通过 Dockerfile 构建镜像，建议使用 Jib 来提升构建和上传速度

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                    

这里指定base image为java:8u172-jre-alpine

同时指定生成的image名称为jib-demo:${maven.build.timestamp}

container标签可以指定相关参数，比如jvmFlags指定JVM参数，ports指定expose的端口号

extraDirectory用于指定要添加的目录，默认为${project.basedir}/src/main/jib，即该目录下的文件夹会在docker镜像里头同步创建，目录层级关系以jib下目录层级关系为准。比如该目录下有app/resources/demo.txt，则对应该镜像目录为/app/resources/demo.txt

打包

mvn compile jib:dockerBuild -X

使用jib:dockerBuild是在本地打包镜像，不push到远程，-X参数是显示debug信息

如果使用jib:build命令，则打包之后push到远程

输出日志实例：

[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] ------------------------------------------------------------------------

查看镜像

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/这三个文件夹

小结

jib默认执行如下操作

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

也就是将libs拷贝到/app/libs，将resources拷贝到/app/resources，将classes拷贝到/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内容，希望对大家的学习有所帮助，也希望大家多多支持。