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Java应用打包成Docker镜像
使用docker load
将可运行的jar与dockerfile放在同一个目录，例如：
dockerfile内容如下：
## 使用最精简的jdk版本 FROM java:8-alpine ## 设置时区 RUN apk add -U tzdata RUN cp /usr/share/zoneinfo/Asia/Shanghai /etc/localtime ## 设置输出格式 ENV LANG en_US.UTF-8 ENV LANGUAGE en_US:en ENV LC_ALL en_US.UTF-8 ## 设置作者 ##指定镜像作者信息，即镜像的Author属性 MAINTAINER saleson ## 添加jar 第一个参数是源jar， 第二个参数输出jar ## ADD的用法是：ADD 宿主机文件的全路径 docker容器下的文件夹路径 ADD istio-springboot-demo-a-1.0-SNAPSHOT.jar demo-a-app.jar ## 通知 Docker 容器在运行时监听指定的网络端口.EXPOSE ##暴露的端口更像是指明了该容器提供的服务需要用到的端口. ##EXPOSE 并不会直接将端口自动和宿主机某个端口建立映射关系 ## 如果 docker run，指定了自动映射 -P，那么会将所有暴露的端口随机映射到宿主机的高阶端口 EXPOSE 8080 ## 指定镜像的默认入口命令，该入口命令会在启动容器时作为根命令执行 ENTRYPOINT exec java -Xmx32m -Xms32m -Xmn32m -Xss256k -jar demo-a-app.jar- 1
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执行docker build命令打包镜像
% docker build -f dockerfile -t istio-springboot-demo-a:latest . [+] Building 2.6s (9/9) FINISHED => [internal] load build definition from dockerfile 0.0s => => transferring dockerfile: 1.22kB 0.0s => [internal] load .dockerignore 0.0s => => transferring context: 2B 0.0s => [internal] load metadata for docker.io/library/java:8-alpine 2.4s => [1/4] FROM docker.io/library/java:8-alpine@sha256:d49bf8c44670834d3dade17f8b84d709e7db47f1887f671a0e098bafa9bae49f 0.0s => [internal] load build context 0.0s => => transferring context: 64B 0.0s => CACHED [2/4] RUN apk add -U tzdata 0.0s => CACHED [3/4] RUN cp /usr/share/zoneinfo/Asia/Shanghai /etc/localtime 0.0s => CACHED [4/4] ADD istio-springboot-demo-a-1.0-SNAPSHOT.jar demo-a-app.jar 0.0s => exporting to image 0.0s => => exporting layers 0.0s => => writing image sha256:5c794ac6ebad9b3b5e581ca642589ad3aa9ff96bf3e53883e31168e39ff52bd0 0.0s => => naming to docker.io/library/istio-sb-demo-a 0.0s Use 'docker scan' to run Snyk tests against images to find vulnerabilities and learn how to fix them % docker images REPOSITORY TAG IMAGE ID CREATED SIZE istio-sb-demo-a latest 5c794ac6ebad 2 minutes ago 166MB- 1
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maven 打包docker镜像
如果有parent， 且要打包的是sub module，需要先在parent的pom.xml添加plugin:
<build> <pluginManagement> <plugins> <plugin> <groupId>com.spotifygroupId> <artifactId>docker-maven-pluginartifactId> <version>1.2.2version> plugin> plugins> pluginManagement> build>- 1
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不然会运行 mvn clean package docker:build 会maven 会提示 No plugin found for prefix ‘docker’ in the current project
如下:[INFO] BUILD FAILURE [INFO] ------------------------------------------------------------------------ [INFO] Total time: 3.948 s [INFO] Finished at: 2022-07-21T17:24:01+08:00 [INFO] Final Memory: 13M/54M [INFO] ------------------------------------------------------------------------ [ERROR] No plugin found for prefix 'docker' in the current project and in the plugin groups [org.apache.maven.plugins, org.codehaus.mojo] available from the repositories [local (/Users/saleson/.m2/repository), nexus-aliyun (http://maven.aliyun.com/nexus/content/groups/public)] -> [Help 1] [ERROR] [ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch. [ERROR] Re-run Maven using the -X switch to enable full debug logging. [ERROR] [ERROR] For more information about the errors and possible solutions, please read the following articles: [ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/NoPluginFoundForPrefixException- 1
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在sub module的pom.xml中添加docker-maven-plugin
<build> <plugins> <defaultGoal>spring-boot:rundefaultGoal> <plugin> // spring-boot-maven-plugin plugin> <plugin> <groupId>com.spotifygroupId> <artifactId>docker-maven-pluginartifactId> <configuration> <imageName>${project.artifactId}:latestimageName> <dockerDirectory>${project.basedir}/dockerdockerDirectory> <resources> <resource> <targetPath>/targetPath> <directory>${project.build.directory}directory> <include>${project.build.finalName}.jarinclude> resource> resources> configuration> plugin> plugins> build>- 1
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在sub module 下新增dockerfile, 路径: docker/Dockerfile
Dockerfile 内容如下：
FROM java:8-alpine ## 设置时区 RUN apk add -U tzdata RUN cp /usr/share/zoneinfo/Asia/Shanghai /etc/localtime ## 设置输出格式 ENV LANG en_US.UTF-8 ENV LANGUAGE en_US:en ENV LC_ALL en_US.UTF-8 MAINTAINER saleson ADD istio-springboot-demo-a-1.0-SNAPSHOT.jar demo-a-app.jar EXPOSE 8080 ENTRYPOINT exec java -Xmx32m -Xms32m -Xmn32m -Xss256k -jar demo-a-app.jar --spring.profiles.active=dev- 1
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运行mvn 命令执行打包：
mvn clean package docker:build -DskipTests- 1
查看打包后的镜像
% docker images REPOSITORY TAG IMAGE ID CREATED SIZE istio-springboot-demo-a latest 22f5d43a2563 6 seconds ago 166MB- 1
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maven 无dockerfile
所有的docker 打包配置都放在maven plugin的configuration中，配置如下：
<plugin> <groupId>com.spotifygroupId> <artifactId>docker-maven-pluginartifactId> <executions> <execution> <id>build-imageid> <phase>packagephase> <goals> <goal>buildgoal> goals> execution> executions> <configuration> <imageName>demo-${project.artifactId}:${docker.image.version}imageName> <baseImage>java:8-alpinebaseImage> <maintainer>salesonmaintainer> <runs> <run>apk add -U tzdatarun> <run>cp /usr/share/zoneinfo/Asia/Shanghai /etc/localtimerun> runs> <env> env> <env> <LANG>en_US.UTF-8LANG> <LANGUAGE>en_US:enLANGUAGE> <LC_ALL>en_US.UTF-8LC_ALL> env> <labels> <label>usage=istio-demolabel> labels> <entryPoint>exec java -Xmx32m -Xms32m -Xmn32m -Xss256k -jar ${project.build.finalName}.jar --spring.profiles.active=deventryPoint> <exposes> <expose>8082expose> exposes> <resources> <resource> <targetPath>/targetPath> <directory>${project.build.directory}directory> <include>${project.build.finalName}.jarinclude> resource> resources> configuration> plugin>- 1
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运行docker 镜像
使用docker run 命令运行镜像，如下：
% docker run -d -p 8080:8080 --name istio-springboot-demo-a istio-springboot-demo-a:latest 1855aa699105703ad83e2f7332a4c6fe2f1a0e1fd51ebe4017e7cc2058cf773e- 1
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查看pod运行情况：
% docker ps -a CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES 8bec7d566384 istio-springboot-demo-a:latest "/bin/sh -c 'exec ja…" 5 seconds ago Up 3 seconds 0.0.0.0:8080->8080/tcp istio-springboot-demo-a- 1
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参考
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- 原文地址：https://blog.csdn.net/Mr_rain/article/details/125912212
