docker build ignore .dockerignore

Demo project:
https://github.com/qinrui777/api-test-demo

please run command to get a jar : ./gradlew -x jar build

• before (加.dockerignore 之前)

  ➜  api-test-demo git:(master) ✗ docker  build -t api-demo:no-ignore .
  Sending build context to Docker daemon  109.7MB
  Step 1/3 : FROM openjdk:8-jdk-alpine
   ---> 97bc1352afde
  Step 2/3 : ADD build/libs/api-demo-0.0.1-SNAPSHOT.jar /app.jar
   ---> 7f709f7b4381
  Step 3/3 : ENTRYPOINT ["java","-jar","/app.jar"]
   ---> Running in e43285b4802f
  Removing intermediate container e43285b4802f
   ---> 62d9f7b72b38
  Successfully built 62d9f7b72b38
  Successfully tagged api-demo:no-ignore

• add .dockerignore

  ➜  api-test-demo git:(master) ✗ cat .dockerignore
  .git
  .DS_Store
  .gitignore
  README.md
  Jenkinsfile
  Dockerfile
  /images/*
  /src/*
  /jenkins/*

• after (加.dockerignore 之后)

  ➜  api-test-demo git:(master) ✗ docker  build -t api-demo:have-ignore .
  Sending build context to Docker daemon  17.33MB
  Step 1/3 : FROM openjdk:8-jdk-alpine
   ---> 97bc1352afde
  Step 2/3 : ADD build/libs/api-demo-0.0.1-SNAPSHOT.jar /app.jar
   ---> Using cache
   ---> 7f709f7b4381
  Step 3/3 : ENTRYPOINT ["java","-jar","/app.jar"]
   ---> Using cache
   ---> 62d9f7b72b38
  Successfully built 62d9f7b72b38
  Successfully tagged api-demo:have-ignore

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