prevent rebuilding whole docker container everytime? improving speed
You can improve your build speed by:
- Install all of your requirement as early as possible.
- Combine all
apt-get/yuminto a single command, after that clean up the apt/yum cache. It can decrease your image size.
Sample:
RUN \ apt-get -y update && \ apt-get -y install curl build-essential nginx && \ apt-get clean && \ rm -rf /var/lib/apt/lists/*- Put
ADD/COPYas late as possible, because it will invalidate the Docker image cache. - Avoid put long-running task (e.g:
apt-get, download large file, etc.) afterADD/COPYfile or directory that is often changed.
Docker take a "snapshot" for each your command. So, when you build a new image from same state (no Dockerfile/file/directory change), it should be fast.
Comment/uncomment Dockerfile in order to reduce apt-get install time might not help you, because it will invalidate your Docker cache.