docker

Comments on building docker images

1. For java applications, openjdk:8-jre-alpine is a better choice for base images.
   • openjdk:8: OS is Debian 10.2, image size: 510MB;
   • openjdk:8-jre-alpine: OS is Alpine Linux, image size: 84.9MB;
2. Use curl instead of wget to download to avoid progress status issues.
   • curl:
     
   • wget:
     
3. In some cases multi-stage builds is a very convenient way to build images for 3-party/complicated applications, see docker/skywalking for an example.