【Docker】多階段構建
阿新 • • 發佈：2020-12-31
環境
- virtual box 6.1
- centos 7.8
- docker 19.03
多階段構建
定義 Dockerfile
FROM maven:3.6.3-openjdk-8-slim as builder LABEL author=jiangbo version=1.0.3 COPY . / #RUN mvn clean package FROM openjdk:8-jdk-alpine ARG JAR_FILE=*.jar COPY --from=builder /${JAR_FILE} app.jar EXPOSE 8080 ENTRYPOINT ["java","-jar","/app.jar"]
準備 spring boot 應用
可以在官網生成一個。
構建
[root@master multi]# docker build -t demo:1.0.3 . Sending build context to Docker daemon 17.01MB Step 1/8 : FROM maven:3.6.3-openjdk-8-slim as builder ---> 05187405e310 Step 2/8 : LABEL author=jiangbo version=1.0.3 ---> Using cache ---> e93004b2e682 Step 3/8 : COPY . / ---> 48b9b04102d8 Step 4/8 : FROM openjdk:8-jdk-alpine ---> a3562aa0b991 Step 5/8 : ARG JAR_FILE=*.jar ---> Running in a88ae571ffe5 Removing intermediate container a88ae571ffe5 ---> ae5612bd07e8 Step 6/8 : COPY --from=builder /${JAR_FILE} app.jar ---> 99022253d767 Step 7/8 : EXPOSE 8080 ---> Running in aec2d6a48621 Removing intermediate container aec2d6a48621 ---> cbf4c735bb9b Step 8/8 : ENTRYPOINT ["java","-jar","/app.jar"] ---> Running in a06af9a28f44 Removing intermediate container a06af9a28f44 ---> 9747915cf8a3 Successfully built 9747915cf8a3 Successfully tagged demo:1.0.3
檢視映象大小
[root@master multi]# docker image ls REPOSITORY TAG IMAGE ID CREATED SIZE demo 1.0.3 9747915cf8a3 8 minutes ago 122MB maven 3.6.3-openjdk-8-slim 05187405e310 17 hours ago 306MB openjdk 8-jdk-alpine a3562aa0b991 19 months ago 105MB [root@master multi]#
可以看到第一次引入的映象構建完成後，就沒有使用了。
總結
介紹了 Docker 的多階段構建。