Optimizing Docker Images

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1 Optimizing Docker Images Brian DeHamer - CenturyLink Labs

2

3 Overview Images & Layers Minimizing Image Size Leveraging the Image Cache Dockerfile Tips Other Tools

4 Images & Layers

5 Interactive Image Creation Workflow for creating images by-hand docker run -it someimage Add/update/delete files docker commit docker rm *

6 Dockerfile Automate image creation with docker build Place instructions for building image in Dockerfile Commands: FROM, COPY, RUN, etc Uses the same run/commit/rm sequence as the interactive approach More repeatable/shareable than the interactive approach *

7 Image Layers Each Dockerfile instruction generates a new layer FROM busybox:latest 8c2e MAINTAINER brian 5bd ff RUN touch foo 0437ee5cf42c CMD ["/bin/sh"] 350e4f999b25

8 Image Layers An image is a hierarchical list of layers Each layer has a reference to its parent Overall image size is the sum of the sizes of the individual layers Each additional instruction you add to your Dockerfile will only ever increase the size of your image *

9 Inspecting Layers View hierarchy of all local layers docker images --tree View hierarchy of image layers w/ command docker history <TAG> View all metadata for a specific layer docker inspect <TAG> View layer directly on disk /var/lib/docker/aufs * * varies by platform

10 Images vs. Layers An image is just a tagged hierarchy of layers Every layer in an image is runnable Helpful when trying to debug Dockerfiles!"cf b4a Virtual Size: 0 B!"6ce2e90b0bc7 Virtual Size: MB!"8c2e Virtual Size: MB Tags: busybox:latest!"d6057c Virtual Size: MB!"70714dda0cf8 Virtual Size: MB Tags: foo:latest $ docker run -it d6057c /bin/sh

11 Minimizing Image Size

12 Virtual Image Size $ docker images REPOSITORY TAG IMAGE ID VIRTUAL SIZE aa latest 5927ecad7beb MB bb latest 4f02d MB cc latest f466548ecd MB debian wheezy 1265e16d0c MB ~370MB in images? Virtual size can be misleading, especially if images have layers in common

13 Reuse Your Base Image $ docker images --tree!"511136ea3c5a Virtual Size: 0 B!"4f c Virtual Size: MB!"1265e16d0c28 Virtual Size: MB Tags: debian:wheezy!"f5f93a9eb89b Virtual Size: MB #"245d46749e30 Virtual Size: MB $!"5927ecad7beb Virtual Size: MB Tags: aa:latest #"c4a4ebecb14b Virtual Size: MB $!"4f02d Virtual Size: MB Tags: bb:latest!"13f53a3a9cb5 Virtual Size: MB!"f466548ecd34 Virtual Size: MB Tags: cc:latest Shared layers are re-used across images ~115 MB in images!

14 Base Images Image Name fedora:21 ubuntu:trusty Size 241 MB 188 MB debian:wheezy 85 MB alpine:3.1 5 MB busybox:latest 2 MB scratch 0 B

15 Language Images Image Name ruby:2.2 python:3.4 perl:5.20 node:0.12 java:7-jdk golang:1.4 Size 775 MB 754 MB 724 MB 706 MB 586 MB 514 MB

16 Command Chaining Beware of creating unnecessary layers with your Dockerfile commands FROM debian:wheezy WORKDIR /tmp RUN wget -nv RUN tar -xvf someutil-v1.0.tar.gz RUN mv /tmp/someutil-v1.0/someutil /usr/bin/someutil RUN rm -rf /tmp/someutility-v1.0 RUN rm /tmp/someutility-v1.0.tar.gz

17 Command Chaining Chaining commands allows you to clean-up before the layer is committed FROM debian:wheezy WORKDIR /tmp RUN wget -nv && \ tar -xvf someutil-v1.0.tar.gz && \ mv /tmp/someutil-v1.0/someutil /usr/bin/someutil && \ rm -rf /tmp/someutility-v1.0 && \ rm /tmp/someutility-v1.0.tar.gz

18 Clean-up After Yourself Try to remove any intermediate/temporary files that you don't need in your final image FROM debian:wheezy RUN apt-get update && \ apt-get install -y curl wget git && \ apt-get clean && \ rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/*

19 Flattening Images Can sometimes reduce size by combining layers docker export <id> docker import - Lots of other tools and Docker proposals for combining image layers Not really recommended

20 Pack Only What You Need Start with FROM scratch and package only the bins/libs you need for your app Use cde to profile your app and identify dependencies Statically-linked binaries w/ no dependencies (C, Go, etc ) centurylink/golang-builder: helps compile statically-linked Go apps and package in minimal Docker containers centurylink/ca-certs: base image that is just scratch plus the standard root CA certificates (257 KB)

21 Leveraging the Image Cache

22 Image Cache All built or pulled layers are saved in the local image cache Docker won t rebuild an unchanged layer (unless you force it to) Significant increase in build speed when iterating on Dockerfile Cache is invalidated for a layer if either the Dockerfile instruction or the parent layer is changed *

23 Build Context The final argument to docker build is typically the build context Allows you to inject local files into your image using the COPY instruction Changes to copied files will also invalidate image cache Dockerfile must be located within the build context *

24 Top-to-Bottom Place the instructions least likely to change at the top of your Dockerfile Make changes/additions at the bottom Place instructions you use across all of your images (MAINTAINER) at the top so they can be re-used across all images

25 .dockerignore Place.dockerignore in the root of build context with list of file/directory patterns to be excluded from build context Very much like.gitignore Helpful when copying the entire build context and want to selectively ignore files FROM busybox:latest COPY. /somedir/ *

26 Beware of Idempotent Operations Instructions that may return different results depending on when they are executed apt-get update, git clone, go get, etc Cached layer may not contain what you expect Can use --no-cache flag with docker build to ignore cache Use strategic command chaining to bust cache

27 Bust Cache with Chained Commands Updating branch name does NOT invalidate cache WORKDIR /tmp RUN git clone RUN git checkout v1.0 Updating branch invalidates cache WORKDIR /tmp RUN git clone && \ git checkout v1.0

28 Dockerfile Tips

29 ADD vs. COPY ADD & COPY instructions both add files/directories to the container ADD can also handle URLs as a source and will automatically extract archives COPY added in Docker 1.0 and only copies files/dirs Use COPY unless there is a specific feature of ADD you absolutely need

30 Repeatable Image Builds Ideally, anyone should be able to build your Dockerfile at any time and get the same result Vague dependencies can result in unpredictable builds RUN apt-get update && apt-get install -y hello vs RUN apt-get update && apt-get install -y hello=2.8-4

31 Shell Variables Each Dockerfile instruction is executed in a new container with a new shell Don t try RUN export FOO=BAR RUN cd /tmp RUN su - someuser Instead use ENV FOO=BAR or RUN FOO=BAR /some/command/that/needs_foo WORKDIR /tmp USER someuser

32 Other Tools / Resources

33 centurylink/dockerfile-from-image Reverse-engineers a Dockerfile from a Docker image Can't recreate ADD or COPY commands exactly $ docker run --rm \ -v /var/run/docker.sock:/var/run/docker.sock \ centurylink/dockerfile-from-image dice FROM debian:wheezy MAINTAINER brian@dehamer.com RUN apt-get update RUN apt-get install -y rolldice CMD ["/usr/games/rolldice" "6"]

34 centurylink/image-graph See relationships between layers in your local image cache

35 imagelayers.io Visualize images on the Docker Hub See layers shared between different images See the instruction for each layer Get information about image size Coming soon! Available now!

36 Additional Reading CenturyLink Labs Blog Best Practices for Writing Dockerfiles Squashing Docker Images - Jason Wilder Create the Smallest Possible Docker Container - Adriaan de Jonge

37 Thanks! Brian DeHamer - CenturyLink Labs

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