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Migrate dockerfiles to use multi-stage builds.
Summary: We previously emulated multi-staged builds using two dockerfiles, native support from Docker allows us to merge them into one, simplifying our scripts. For more details about multi-stage builds, see: https://docs.docker.com/develop/develop-images/multistage-build/ Reviewers: mehdi_amini, klimek, sammccall Reviewed By: sammccall Subscribers: llvm-commits, ioeric, cfe-commits Differential Revision: https://reviews.llvm.org/D44787 llvm-svn: 328503
This commit is contained in:
Ilya Biryukov
parent
242350214f
commit
0d541f9030
@ -53,24 +53,15 @@ serve as a basis for anyone who wants to create their own Docker image with
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LLVM components, compiled from sources. The sources are checked out from the
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upstream svn repository when building the image.
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Inside each subfolder we host Dockerfiles for two images:
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The resulting image contains only the requested LLVM components and a few extra
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packages to make the image minimally useful for C++ development, e.g. libstdc++
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and binutils.
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- ``build/`` image is used to compile LLVM, it installs a system compiler and all
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build dependencies of LLVM. After the build process is finished, the build
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image will have an archive with compiled components at ``/tmp/clang.tar.gz``.
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- ``release/`` image usually only contains LLVM components, compiled by the
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``build/`` image, and also libstdc++ and binutils to make image minimally
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useful for C++ development. The assumption is that you usually want clang to
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be one of the provided components.
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To build both of those images, use ``build_docker_image.sh`` script.
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It will checkout LLVM sources and build clang in the ``build`` container, copy results
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of the build to the local filesystem and then build the ``release`` container using
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those. The ``build_docker_image.sh`` accepts a list of LLVM repositories to
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checkout, and arguments for CMake invocation.
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The interface to run the build is ``build_docker_image.sh`` script. It accepts a
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list of LLVM repositories to checkout and arguments for CMake invocation.
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If you want to write your own docker image, start with an ``example/`` subfolder.
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It provides incomplete Dockerfiles with (very few) FIXMEs explaining the steps
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It provides an incomplete Dockerfile with (very few) FIXMEs explaining the steps
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you need to take in order to make your Dockerfiles functional.
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Usage
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@ -110,10 +101,10 @@ this command will do that:
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-DBOOTSTRAP_CMAKE_BUILD_TYPE=Release \
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-DCLANG_ENABLE_BOOTSTRAP=ON -DCLANG_BOOTSTRAP_TARGETS="install-clang;install-clang-headers"
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This will produce two images, a release image ``clang-debian8:staging`` and a
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build image ``clang-debian8-build:staging`` from the latest upstream revision.
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After the image is built you can run bash inside a container based on your
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image like this:
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This will produce a new image ``clang-debian8:staging`` from the latest
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upstream revision.
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After the image is built you can run bash inside a container based on your image
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like this:
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.. code-block:: bash
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@ -181,19 +172,14 @@ debian8-based image using the latest ``google/stable`` sources for you:
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Minimizing docker image size
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============================
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Due to Docker restrictions we use two images (i.e., build and release folders)
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for the release image to be as small as possible. It's much easier to achieve
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that using two images, because Docker would store a filesystem layer for each
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command in the Dockerfile, i.e. if you install some packages in one command,
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then remove those in a separate command, the size of the resulting image will
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still be proportinal to the size of an image with installed packages.
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Therefore, we strive to provide a very simple release image which only copies
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compiled clang and does not do anything else.
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Docker 1.13 added a ``--squash`` flag that allows to flatten the layers of the
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image, i.e. remove the parts that were actually deleted. That is an easier way
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to produce the smallest images possible by using just a single image. We do not
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use it because as of today the flag is in experimental stage and not everyone
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may have the latest docker version available. When the flag is out of
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experimental stage, we should investigate replacing two images approach with
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just a single image, built using ``--squash`` flag.
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Due to how Docker's filesystem works, all intermediate writes are persisted in
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the resulting image, even if they are removed in the following commands.
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To minimize the resulting image size we use `multi-stage Docker builds
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<https://docs.docker.com/develop/develop-images/multistage-build/>`_.
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Internally Docker builds two images. The first image does all the work: installs
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build dependencies, checks out LLVM source code, compiles LLVM, etc.
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The first image is only used during build and does not have a descriptive name,
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i.e. it is only accessible via the hash value after the build is finished.
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The second image is our resulting image. It contains only the built binaries
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and not any build dependencies. It is also accessible via a descriptive name
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(specified by -d and -t flags).
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@ -163,19 +163,9 @@ if [ "$DOCKER_TAG" != "" ]; then
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DOCKER_TAG=":$DOCKER_TAG"
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fi
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echo "Building from $IMAGE_SOURCE"
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echo "Building $DOCKER_REPOSITORY-build$DOCKER_TAG"
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docker build -t "$DOCKER_REPOSITORY-build$DOCKER_TAG" \
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--build-arg "buildscript_args=$BUILDSCRIPT_ARGS" \
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-f "$BUILD_DIR/$IMAGE_SOURCE/build/Dockerfile" \
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"$BUILD_DIR"
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echo "Copying clang installation to release image sources"
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docker run -v "$BUILD_DIR/$IMAGE_SOURCE:/workspace" "$DOCKER_REPOSITORY-build$DOCKER_TAG" \
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cp /tmp/clang.tar.gz /workspace/release
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echo "Building release image"
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echo "Building ${DOCKER_REPOSITORY}${DOCKER_TAG} from $IMAGE_SOURCE"
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docker build -t "${DOCKER_REPOSITORY}${DOCKER_TAG}" \
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"$BUILD_DIR/$IMAGE_SOURCE/release"
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--build-arg "buildscript_args=$BUILDSCRIPT_ARGS" \
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-f "$BUILD_DIR/$IMAGE_SOURCE/Dockerfile" \
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"$BUILD_DIR"
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echo "Done"
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@ -6,22 +6,18 @@
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# License. See LICENSE.TXT for details.
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#
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#===----------------------------------------------------------------------===//
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# Produces an image that compiles and archives clang, based on debian8.
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FROM launcher.gcr.io/google/debian8:latest
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# Stage 1. Check out LLVM source code and run the build.
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FROM launcher.gcr.io/google/debian8:latest as builder
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LABEL maintainer "LLVM Developers"
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# Install build dependencies of llvm.
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# First, Update the apt's source list and include the sources of the packages.
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RUN grep deb /etc/apt/sources.list | \
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sed 's/^deb/deb-src /g' >> /etc/apt/sources.list
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# Install compiler, python and subversion.
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RUN apt-get update && \
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apt-get install -y --no-install-recommends ca-certificates gnupg \
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build-essential python wget subversion unzip && \
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rm -rf /var/lib/apt/lists/*
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# Install a newer ninja release. It seems the older version in the debian repos
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# randomly crashes when compiling llvm.
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RUN wget "https://github.com/ninja-build/ninja/releases/download/v1.8.2/ninja-linux.zip" && \
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@ -29,10 +25,8 @@ RUN wget "https://github.com/ninja-build/ninja/releases/download/v1.8.2/ninja-li
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| sha256sum -c && \
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unzip ninja-linux.zip -d /usr/local/bin && \
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rm ninja-linux.zip
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# Import public key required for verifying signature of cmake download.
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RUN gpg --keyserver hkp://pgp.mit.edu --recv 0x2D2CEF1034921684
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# Download, verify and install cmake version that can compile clang into /usr/local.
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# (Version in debian8 repos is is too old)
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RUN mkdir /tmp/cmake-install && cd /tmp/cmake-install && \
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@ -47,9 +41,18 @@ RUN mkdir /tmp/cmake-install && cd /tmp/cmake-install && \
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ADD checksums /tmp/checksums
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ADD scripts /tmp/scripts
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# Arguments passed to build_install_clang.sh.
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ARG buildscript_args
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# Run the build. Results of the build will be available as /tmp/clang.tar.gz.
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# Run the build. Results of the build will be available at /tmp/clang-install/.
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RUN /tmp/scripts/build_install_llvm.sh ${buildscript_args}
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# Stage 2. Produce a minimal release image with build results.
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FROM launcher.gcr.io/google/debian8:latest
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LABEL maintainer "LLVM Developers"
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# Install packages for minimal useful image.
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RUN apt-get update && \
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apt-get install -y --no-install-recommends libstdc++-4.9-dev binutils && \
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rm -rf /var/lib/apt/lists/*
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# Copy build results of stage 1 to /usr/local.
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COPY --from=builder /tmp/clang-install/ /usr/local/
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@ -1,21 +0,0 @@
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#===- llvm/utils/docker/debian8/release/Dockerfile -----------------------===//
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#
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# The LLVM Compiler Infrastructure
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#
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# This file is distributed under the University of Illinois Open Source
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# License. See LICENSE.TXT for details.
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#
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#===----------------------------------------------------------------------===//
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# A release image, containing clang installation, produced by the 'build/' image
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# and adding libstdc++ and binutils.
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FROM launcher.gcr.io/google/debian8:latest
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LABEL maintainer "LLVM Developers"
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# Install packages for minimal useful image.
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RUN apt-get update && \
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apt-get install -y --no-install-recommends libstdc++-4.9-dev binutils && \
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rm -rf /var/lib/apt/lists/*
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# Unpack clang installation into this image.
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ADD clang.tar.gz /usr/local/
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@ -9,20 +9,29 @@
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# This is an example Dockerfile to build an image that compiles clang.
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# Replace FIXMEs to prepare your own image.
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# Stage 1. Check out LLVM source code and run the build.
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# FIXME: Replace 'ubuntu' with your base image
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FROM ubuntu
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FROM ubuntu as builder
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# FIXME: Change maintainer name
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LABEL maintainer "Maintainer <maintainer@email>"
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# FIXME: Install llvm/clang build dependencies. Including compiler to
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# FIXME: Install llvm/clang build dependencies here. Including compiler to
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# build stage1, cmake, subversion, ninja, etc.
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ADD checksums /tmp/checksums
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ADD scripts /tmp/scripts
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# Arguments passed to build_install_clang.sh.
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ARG buildscript_args
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# Run the build. Results of the build will be available as /tmp/clang.tar.gz.
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# Run the build. Results of the build will be available as /tmp/clang-install.
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RUN /tmp/scripts/build_install_llvm.sh ${buildscript_args}
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# Stage 2. Produce a minimal release image with build results.
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# FIXME: Replace 'ubuntu' with your base image.
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FROM ubuntu
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# FIXME: Change maintainer name.
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LABEL maintainer "Maintainer <maintainer@email>"
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# FIXME: Install all packages you want to have in your release container.
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# A minimal useful installation should include at least libstdc++ and binutils.
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# Copy build results of stage 1 to /usr/local.
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COPY --from=builder /tmp/clang-install/ /usr/local/
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@ -1,24 +0,0 @@
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#===- llvm/utils/docker/example/release/Dockerfile -----------------------===//
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#
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# The LLVM Compiler Infrastructure
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#
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# This file is distributed under the University of Illinois Open Source
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# License. See LICENSE.TXT for details.
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#
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#===----------------------------------------------------------------------===//
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# An image that unpacks a clang installation, compiled by the 'build/'
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# container.
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# Replace FIXMEs to prepare your own image.
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# FIXME: Replace 'ubuntu' with your base image.
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FROM ubuntu
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# FIXME: Change maintainer name.
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LABEL maintainer "Maintainer <maintainer@email>"
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# FIXME: Install all packages you want to have in your release container.
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# A minimal useful installation must include libstdc++ and binutils.
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# Unpack clang installation into this container.
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# It is copied to this directory by build_docker_image.sh script.
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ADD clang.tar.gz /usr/local/
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@ -6,26 +6,26 @@
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# License. See LICENSE.TXT for details.
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#
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#===----------------------------------------------------------------------===//
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# Produces an image that compiles and archives clang, based on nvidia/cuda
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# image.
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FROM nvidia/cuda:8.0-devel
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# Stage 1. Check out LLVM source code and run the build.
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FROM nvidia/cuda:8.0-devel as builder
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LABEL maintainer "LLVM Developers"
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# Arguments to pass to build_install_clang.sh.
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ARG buildscript_args
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# Install llvm build dependencies.
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RUN apt-get update && \
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apt-get install -y --no-install-recommends ca-certificates cmake python \
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subversion ninja-build && \
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subversion ninja-build && \
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rm -rf /var/lib/apt/lists/*
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ADD checksums /tmp/checksums
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ADD scripts /tmp/scripts
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# Arguments passed to build_install_clang.sh.
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ARG buildscript_args
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# Run the build. Results of the build will be available as /tmp/clang.tar.gz.
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# Run the build. Results of the build will be available at /tmp/clang-install/.
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RUN /tmp/scripts/build_install_llvm.sh ${buildscript_args}
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# Stage 2. Produce a minimal release image with build results.
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FROM nvidia/cuda:8.0-devel
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LABEL maintainer "LLVM Developers"
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# Copy clang installation into this container.
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COPY --from=builder /tmp/clang-install/ /usr/local/
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# C++ standard library and binutils are already included in the base package.
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@ -1,23 +0,0 @@
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#===- llvm/utils/docker/nvidia-cuda/release/Dockerfile -------------------===//
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#
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# The LLVM Compiler Infrastructure
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#
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# This file is distributed under the University of Illinois Open Source
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# License. See LICENSE.TXT for details.
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#
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#===----------------------------------------------------------------------===//
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# This is an example Dockerfile that copies a clang installation, compiled
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# by the 'build/' container into a fresh docker image to get a container of
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# minimal size.
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# Replace FIXMEs to prepare a new Dockerfile.
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# FIXME: Replace 'ubuntu' with your base image.
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FROM nvidia/cuda:8.0-devel
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# FIXME: Change maintainer name.
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LABEL maintainer "LLVM Developers"
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# Unpack clang installation into this container.
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ADD clang.tar.gz /usr/local/
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# C++ standard library and binutils are already included in the base package.
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@ -16,8 +16,8 @@ Usage: build_install_llvm.sh [options] -- [cmake-args]
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Checkout svn sources and run cmake with the specified arguments. Used
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inside docker container.
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Passes additional -DCMAKE_INSTALL_PREFIX and archives the contents of
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the directory to /tmp/clang.tar.gz.
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Passes additional -DCMAKE_INSTALL_PREFIX and puts the build results into
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/tmp/clang-install/ directory.
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Available options:
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-h|--help show this help message
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@ -244,12 +244,7 @@ ninja $CMAKE_INSTALL_TARGETS
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popd
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# Pack the installed clang into an archive.
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echo "Archiving clang installation to /tmp/clang.tar.gz"
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cd "$CLANG_INSTALL_DIR"
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tar -czf /tmp/clang.tar.gz *
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# Cleanup.
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rm -rf "$CLANG_BUILD_DIR" "$CLANG_INSTALL_DIR"
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rm -rf "$CLANG_BUILD_DIR"
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echo "Done"
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