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 ${project.basedir}/src/main/jib
这里指定baseimage为java:8u172-jre-alpine
同时指定生成的image名称为jib-demo:${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
mvncompilejib: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]TIMINGBuildingimagetoDockerdaemon [DEBUG]RUNNINGBuildingimagetoDockerdaemon [INFO]Gettingbaseimagejava:8u172-jre-alpine... [DEBUG]TIMINGPullingbaseimagemanifest [DEBUG]RUNNINGPullingbaseimagemanifest [DEBUG]TIMINGBuildingapplicationlayers [DEBUG]RUNNINGBuildingapplicationlayers [INFO]Buildingdependencieslayer... [DEBUG]TIMINGBuildingdependencieslayer [DEBUG]RUNNINGBuildingdependencieslayer [INFO]Buildingresourceslayer... [DEBUG]TIMINGBuildingresourceslayer [DEBUG]RUNNINGBuildingresourceslayer [INFO]Buildingclasseslayer... [DEBUG]TIMINGBuildingclasseslayer [DEBUG]RUNNINGBuildingclasseslayer [INFO]Buildingextrafileslayer... [DEBUG]TIMINGBuildingextrafileslayer [DEBUG]RUNNINGBuildingextrafileslayer [DEBUG]TIMEDBuildingapplicationlayers:3.498ms [DEBUG]Buildingapplicationlayers:3.498ms [DEBUG]Buildingextrafileslayerbuiltsha256:0a9321c621ee2c138d9a93f4ba47f825e20dd7aca0e9206f30bf560122fdaa31 [DEBUG]Buildingresourceslayerbuiltsha256:933116c8da4db70000355b750af2f3b5c4545e74db7b5eb0a5e37689ef86d44f [DEBUG]Buildingclasseslayerbuiltsha256:a99dbde7d015ba3d15b9265ac38f6536d65b00dd2a864b7003a34742f483939b [DEBUG]TIMEDBuildingextrafileslayer:33.718ms [DEBUG]TIMEDBuildingclasseslayer:33.901ms [DEBUG]Buildingextrafileslayer:33.718ms [DEBUG]TIMEDBuildingresourceslayer:34.062ms [DEBUG]Buildingresourceslayer:34.062ms [DEBUG]Buildingclasseslayer:33.901ms [DEBUG]Buildingdependencieslayerbuiltsha256:a19961ec08095eb70ca3a070945223dcf51500a255a745272276139bf0a29f4e [DEBUG]TIMEDBuildingdependencieslayer:1047.83ms [DEBUG]Buildingdependencieslayer:1047.83ms [INFO]Thebaseimagerequiresauth.Tryingagainforjava:8u172-jre-alpine... //...... [DEBUG]TIMEDPullingbaseimagemanifest:8959.891ms [DEBUG]Pullingbaseimagemanifest:8959.891ms [DEBUG]TIMINGSettingupbaseimagecaching [DEBUG]RUNNINGSettingupbaseimagecaching [DEBUG]TIMEDSettingupbaseimagecaching:0.824ms [DEBUG]Settingupbaseimagecaching:0.824ms [DEBUG]TIMINGPullingbaseimagelayersha256:500c0ac4cdc58aee9a008e70466eeec8a4b74b25c29d003764635d2fe1b42827 [DEBUG]RUNNINGPullingbaseimagelayersha256:500c0ac4cdc58aee9a008e70466eeec8a4b74b25c29d003764635d2fe1b42827 [DEBUG]TIMINGPullingbaseimagelayersha256:aa38cd8c77d7320c7489327775e074580db5f23467198aab3e79c7db5cdfbdca [DEBUG]TIMINGPullingbaseimagelayersha256:cb56d62302ec31640b40ca15843e7af6be145966a1064c78ea7afd6f10ce49e6 [DEBUG]RUNNINGPullingbaseimagelayersha256:cb56d62302ec31640b40ca15843e7af6be145966a1064c78ea7afd6f10ce49e6 [DEBUG]TIMINGPullingbaseimagelayersha256:ff3a5c916c92643ff77519ffa742d3ec61b7f591b6b7504599d95a4a41134e28 [DEBUG]RUNNINGPullingbaseimagelayersha256:ff3a5c916c92643ff77519ffa742d3ec61b7f591b6b7504599d95a4a41134e28 [DEBUG]RUNNINGPullingbaseimagelayersha256:aa38cd8c77d7320c7489327775e074580db5f23467198aab3e79c7db5cdfbdca [DEBUG]TIMEDPullingbaseimagelayersha256:500c0ac4cdc58aee9a008e70466eeec8a4b74b25c29d003764635d2fe1b42827:612.524ms [DEBUG]Pullingbaseimagelayersha256:500c0ac4cdc58aee9a008e70466eeec8a4b74b25c29d003764635d2fe1b42827:612.524ms [DEBUG]TIMEDPullingbaseimagelayersha256:ff3a5c916c92643ff77519ffa742d3ec61b7f591b6b7504599d95a4a41134e28:9985.702ms [DEBUG]Pullingbaseimagelayersha256:ff3a5c916c92643ff77519ffa742d3ec61b7f591b6b7504599d95a4a41134e28:9985.702ms [DEBUG]TIMEDPullingbaseimagelayersha256:aa38cd8c77d7320c7489327775e074580db5f23467198aab3e79c7db5cdfbdca:27267.144ms [DEBUG]Pullingbaseimagelayersha256:aa38cd8c77d7320c7489327775e074580db5f23467198aab3e79c7db5cdfbdca:27267.144ms [DEBUG]TIMEDPullingbaseimagelayersha256:cb56d62302ec31640b40ca15843e7af6be145966a1064c78ea7afd6f10ce49e6:54734.971ms [DEBUG]Pullingbaseimagelayersha256:cb56d62302ec31640b40ca15843e7af6be145966a1064c78ea7afd6f10ce49e6:54734.971ms [DEBUG]TIMINGBuildingcontainerconfiguration [DEBUG]RUNNINGBuildingcontainerconfiguration [INFO]Finalizing... [DEBUG]TIMEDBuildingcontainerconfiguration:0.462ms [DEBUG]Buildingcontainerconfiguration:0.462ms [INFO]LoadingtoDockerdaemon... [DEBUG]TIMEDBuildingimagetoDockerdaemon:65862.956ms [DEBUG]BuildingimagetoDockerdaemon:65862.956ms [INFO] [INFO]Containerentrypointsetto[java,-Xms512m,-cp,/app/resources/:/app/classes/:/app/libs/*,com.example.JibDemoApplication] [INFO] [INFO]BuiltimagetoDockerdaemonasjib-demo:20180826 [INFO] [INFO]------------------------------------------------------------------------ [INFO]BUILDSUCCESS [INFO]------------------------------------------------------------------------ [INFO]Totaltime:01:07min [INFO]Finishedat:2018-08-26T21:38:11+08:00 [INFO]FinalMemory:26M/493M [INFO]------------------------------------------------------------------------
查看镜像
dockerinspectjib-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
COPYlibs/app/libs/ COPYresources/app/resources/ COPYclasses/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
- BuildingDockerImageforaSpringBootAppWithJib
- 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毛票票。