ci

Developer use of CI Docker images

Two flavors of Envoy Docker images, based on Ubuntu and Alpine Linux, are built.

Ubuntu envoy image

The Ubuntu based Envoy Docker image at envoyproxy/envoy-build:<hash> is used for Travis CI checks, where <hash> is specified in envoy_build_sha.sh. Developers may work with envoyproxy/envoy-build:latest to provide a self-contained environment for building Envoy binaries and running tests that reflects the latest built Ubuntu Envoy image. Moreover, the Docker image at envoyproxy/envoy:<hash> is an image that has an Envoy binary at /usr/local/bin/envoy. The <hash> corresponds to the master commit at which the binary was compiled. Lastly, envoyproxy/envoy:latest contains an Envoy binary built from the latest tip of master that passed tests.

Alpine envoy image

Minimal images based on Alpine Linux allow for quicker deployment of Envoy. Two Alpine based images are built, one with an Envoy binary with debug (envoyproxy/envoy-alpine-debug) symbols and one stripped of them (envoyproxy/envoy-alpine). Both images are pushed with two different tags: <hash> and latest. Parallel to the Ubuntu images above, <hash> corresponds to the master commit at which the binary was compiled, and latest corresponds to a binary built from the latest tip of master that passed tests.

Build image base and compiler versions

Currently there are three build images:

• envoyproxy/envoy-build — alias to envoyproxy/envoy-build-ubuntu.
• envoyproxy/envoy-build-ubuntu — based on Ubuntu 16.04 (Xenial) which uses the GCC 5.4 compiler.
• envoyproxy/envoy-build-centos — based on CentOS 7 which uses the GCC 5.3.1 compiler (devtoolset-4).

We also install and use the clang-6.0 compiler for some sanitizing runs.

Building and running tests as a developer

An example basic invocation to build a developer version of the Envoy static binary (using the Bazel fastbuild type) is:

./ci/run_envoy_docker.sh './ci/do_ci.sh bazel.dev'

The build image defaults to envoyproxy/envoy-build-ubuntu, but you can choose build image by setting IMAGE_NAME in the environment, e.g. to use the envoyproxy/envoy-build-centos image you can run:

IMAGE_NAME=envoyproxy/envoy-build-centos ./ci/run_envoy_docker.sh './ci/do_ci.sh bazel.dev'

In case your setup is behind a proxy, set http_proxy and https_proxy to the proxy servers before invoking the build.

IMAGE_NAME=envoyproxy/envoy-build-centos http_proxy=http://proxy.foo.com:8080 https_proxy=http://proxy.bar.com:8080 ./ci/run_envoy_docker.sh './ci/do_ci.sh bazel.dev'

The Envoy binary can be found in /tmp/envoy-docker-build/envoy/source/exe/envoy-fastbuild on the Docker host. You can control this by setting ENVOY_DOCKER_BUILD_DIR in the environment, e.g. to generate the binary in ~/build/envoy/source/exe/envoy-fastbuild you can run:

ENVOY_DOCKER_BUILD_DIR=~/build ./ci/run_envoy_docker.sh './ci/do_ci.sh bazel.dev'

For a release version of the Envoy binary you can run:

./ci/run_envoy_docker.sh './ci/do_ci.sh bazel.release.server_only'

The build artifact can be found in /tmp/envoy-docker-build/envoy/source/exe/envoy (or wherever $ENVOY_DOCKER_BUILD_DIR points).

For a debug version of the Envoy binary you can run:

./ci/run_envoy_docker.sh './ci/do_ci.sh bazel.debug.server_only'

The build artifact can be found in /tmp/envoy-docker-build/envoy/source/exe/envoy-debug (or wherever $ENVOY_DOCKER_BUILD_DIR points).

The ./ci/run_envoy_docker.sh './ci/do_ci.sh <TARGET>' targets are:

• bazel.api — build and run API tests under -c fastbuild with clang-6.0.
• bazel.asan — build and run tests under -c dbg --config=clang-asan with clang-6.0.
• bazel.debug — build Envoy static binary and run tests under -c dbg.
• bazel.debug.server_only — build Envoy static binary under -c dbg.
• bazel.dev — build Envoy static binary and run tests under -c fastbuild with gcc.
• bazel.release — build Envoy static binary and run tests under -c opt with gcc.
• bazel.release <test> — build Envoy static binary and run a specified test or test dir under -c opt with gcc.
• bazel.release.server_only — build Envoy static binary under -c opt with gcc.
• bazel.coverage — build and run tests under -c dbg with gcc, generating coverage information in $ENVOY_DOCKER_BUILD_DIR/envoy/generated/coverage/coverage.html.
• bazel.coverity — build Envoy static binary and run Coverity Scan static analysis.
• bazel.tsan — build and run tests under -c dbg --config=clang-tsan with clang-6.0.
• check_format— run clang-format-6.0 and buildifier on entire source tree.
• fix_format— run and enforce clang-format-6.0 and buildifier on entire source tree.
• docs— build documentation tree in generated/docs.

Testing changes to the build image as a developer

While all changes to the build image should eventually be upstreamed, it can be useful to test those changes locally before sending out a pull request. To experiment with a local clone of the upstream build image you can make changes to files such as build_container.sh locally and then run:

DISTRO=ubuntu
cd ci/build_container
LINUX_DISTRO="${DISTRO}" CIRCLE_SHA1=my_tag ./docker_build.sh  # Wait patiently for quite some time
cd ../..
IMAGE_NAME="envoyproxy/envoy-build-${DISTRO}" IMAGE_ID=my_tag ./ci/run_envoy_docker.sh './ci/do_ci.sh bazel.whatever'

This build the Ubuntu based envoyproxy/envoy-build-ubuntu image, and the final call will run against your local copy of the build image. To build the CentOS based envoyproxy/envoy-build-ubuntu-centos image, change DISTRO above to centos.

MacOS Build Flow

The MacOS CI build is part of the CircleCI workflow. Dependencies are installed by the ci/mac_ci_setup.sh script, via Homebrew, which is pre-installed on the CircleCI MacOS image. The dependencies are cached are re-installed on every build. The ci/mac_ci_steps.sh script executes the specific commands that build and test Envoy.

Coverity Scan Build Flow

Coverity Scan Envoy Project

Coverity Scan static analysis is not run within Envoy CI. However, Envoy can be locally built and submitted for analysis. A Coverity Scan Envoy project token must be generated from the Coverity Project Settings. Only a Coverity Project Administrator can create a token. With this token, running ci/do_coverity_local.sh will use the Ubuntu based envoyproxy/envoy-build-ubuntu image to build the Envoy static binary with the Coverity Scan tool chain. This process generates an artifact, envoy-coverity-output.tgz, that is uploaded to Coverity for static analysis.

To build and submit for analysis:

COVERITY_TOKEN={generated Coverity project token} ./ci/do_coverity_local.sh