> ## Documentation Index
> Fetch the complete documentation index at: https://bazel-pr-29946.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# Getting Started with Bazel Docker Container

This page provides details on the contents of the Bazel container, how to build
the [abseil-cpp](https://github.com/abseil/abseil-cpp) project using Bazel
inside the Bazel container, and how to build this project directly
from the host machine using the Bazel container with directory mounting.

## Build Abseil project from your host machine with directory mounting

The instructions in this section allow you to build using the Bazel container
with the sources checked out in your host environment. A container is started up
for each build command you execute. Build results are cached in your host
environment so they can be reused across builds.

Clone the project to a directory in your host machine.

```posix-terminal theme={null}
git clone --depth 1 --branch 20220623.1 https://github.com/abseil/abseil-cpp.git /src/workspace
```

Create a folder that will have cached results to be shared across builds.

```posix-terminal theme={null}
mkdir -p /tmp/build_output/
```

Use the Bazel container to build the project and make the build
outputs available in the output folder in your host machine.

```posix-terminal theme={null}
docker run \
  -e USER="$(id -u)" \
  -u="$(id -u)" \
  -v /src/workspace:/src/workspace \
  -v /tmp/build_output:/tmp/build_output \
  -w /src/workspace \
  gcr.io/bazel-public/bazel:latest \
  --output_user_root=/tmp/build_output \
  build //absl/...
```

Build the project with sanitizers by adding the `--config={{ "<var>" }}asan{{ "</var>" }}|{{ "<var>" }}tsan{{ "</var>" }}|{{ "<var>" }}msan{{ "</var>" }}` build
flag to select AddressSanitizer (asan), ThreadSanitizer (tsan) or
MemorySanitizer (msan) accordingly.

```posix-terminal theme={null}
docker run \
  -e USER="$(id -u)" \
  -u="$(id -u)" \
  -v /src/workspace:/src/workspace \
  -v /tmp/build_output:/tmp/build_output \
  -w /src/workspace \
  gcr.io/bazel-public/bazel:latest \
  --output_user_root=/tmp/build_output \
  build --config={asan | tsan | msan} -- //absl/... -//absl/types:variant_test
```

## Build Abseil project from inside the container

The instructions in this section allow you to build using the Bazel container
with the sources inside the container. By starting a container at the beginning
of your development workflow and doing changes in the worskpace within the
container, build results will be cached.

Start a shell in the Bazel container:

```posix-terminal theme={null}
docker run --interactive --entrypoint=/bin/bash gcr.io/bazel-public/bazel:latest
```

Each container id is unique. In the instructions below, the container was 5a99103747c6.

Clone the project.

```posix-terminal theme={null}
ubuntu@5a99103747c6:~$ git clone --depth 1 --branch 20220623.1 https://github.com/abseil/abseil-cpp.git && cd abseil-cpp/
```

Do a regular build.

```posix-terminal theme={null}
ubuntu@5a99103747c6:~/abseil-cpp$ bazel build //absl/...
```

Build the project with sanitizers by adding the `--config={{ "<var>" }}asan{{ "</var>" }}|{{ "<var>" }}tsan{{ "</var>" }}|{{ "<var>" }}msan{{ "</var>" }}`
build flag to select AddressSanitizer (asan), ThreadSanitizer (tsan) or
MemorySanitizer (msan) accordingly.

```posix-terminal theme={null}
ubuntu@5a99103747c6:~/abseil-cpp$ bazel build --config={asan | tsan | msan} -- //absl/... -//absl/types:variant_test
```

## Explore the Bazel container

If you haven't already, start an interactive shell inside the Bazel container.

```posix-terminal theme={null}
docker run -it --entrypoint=/bin/bash gcr.io/bazel-public/bazel:latest
ubuntu@5a99103747c6:~$
```

Explore the container contents.

```posix-terminal theme={null}
ubuntu@5a99103747c6:~$ gcc --version
gcc (Ubuntu 9.4.0-1ubuntu1~20.04.1) 9.4.0
Copyright (C) 2019 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

ubuntu@5a99103747c6:~$ java -version
openjdk version "1.8.0_362"
OpenJDK Runtime Environment (build 1.8.0_362-8u372-ga~us1-0ubuntu1~20.04-b09)
OpenJDK 64-Bit Server VM (build 25.362-b09, mixed mode)

ubuntu@5a99103747c6:~$ python -V
Python 3.8.10

ubuntu@5a99103747c6:~$ bazel version
WARNING: Invoking Bazel in batch mode since it is not invoked from within a workspace (below a directory having a WORKSPACE file).
Extracting Bazel installation...
Build label: 6.2.1
Build target: bazel-out/k8-opt/bin/src/main/java/com/google/devtools/build/lib/bazel/BazelServer_deploy.jar
Build time: Fri Jun 2 16:59:58 2023 (1685725198)
Build timestamp: 1685725198
Build timestamp as int: 1685725198
```

## Explore the Bazel Dockerfile

If you want to check how the Bazel Docker image is built, you can find its Dockerfile at [bazelbuild/continuous-integration/bazel/oci](https://github.com/bazelbuild/continuous-integration/tree/master/bazel/oci).