Error: Docker is unreachable. Docker needs to be running to build inside a container.

ToC

• Specifying DOCKER_HOST

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When I ran a build with sam build --use-container, the following error occurred.

Error: Docker is unreachable. Docker needs to be running to build inside a container.

Specifying DOCKER_HOST

Check the current context.

$ docker info | grep 'Context:'

 Context:    desktop-linux

Check the endpoint.

$ docker context ls | grep desktop-linux

desktop-linux *     moby                Docker Desktop                            unix:///Users/kenzo.tanaka/.docker/run/docker.sock

By specifying DOCKER_HOST and running the command again, I was able to avoid the error.

$ env SAM_CLI_TELEMETRY=0 \
    DOCKER_HOST=unix:///Users/kenzo.tanaka/.docker/run/docker.sock \
    sam build --use-container --cached --parallel

That’s all.
For your reference.