Help - Timed out while attempting to establish a connection to the container.

[nla-sean]

Hi all,
I am trying to get sam api running locally in a container but keep hitting roadblocks, I've now gotten as far as Sam building in the container and running. However, whenever trying to connect I get the following:

Mounting /app/.aws-sam/build/ServiceFn as /var/task:ro,delegated, inside runtime container
[Container state] OOMKilled False
Cleaning all decompressed code dirs
Timed out while attempting to establish a connection to the container. You can increase this timeout by setting the SAM_CLI_CONTAINER_CONNECTION_TIMEOUT environment variable. The current timeout is 20.0 (seconds).
Invalid lambda response received: Lambda response must be valid json
Lambda execution failed ()

Watching Docker I can see it spin up another container, but nothing happens, eventually the timeout hits, this message appears and the container disappears.
At a loss as to what to do here, so any help would be appreciated.

DockerFile

FROM public.ecr.aws/sam/build-go1.x:latest

WORKDIR /app

# Install system dependencies
RUN yum update -y && \
    yum install -y \
    git \
    make \
    wget \
    tar \
    gzip \
    && yum clean all

# Install Go
RUN wget https://go.dev/dl/go1.21.6.linux-amd64.tar.gz && \
    tar -C /usr/local -xzf go1.21.6.linux-amd64.tar.gz && \
    rm go1.21.6.linux-amd64.tar.gz

# Set Go environment variables
ENV PATH="/usr/local/go/bin:${PATH}"
ENV GOPATH="/go"
ENV PATH="${GOPATH}/bin:${PATH}"

# Install AWS SAM CLI
RUN pip install --no-cache-dir aws-sam-cli

# Copy the application code
COPY . /app

# Build the application first
# RUN sam build

# Start the API with debug mode
ENTRYPOINT ["sam", "local", "start-api", "--debug", "--host", "0.0.0.0"]

Docker Compose

name: app

services:
  api:
    build:
      context: ./
      dockerfile: Dockerfile
    ports:
      - "3000:3000"
    container_name: app
    environment:
      - AWS_SAM_LOCAL=true
    volumes:
      - ~/.aws/:/root/.aws:ro
      - /var/run/docker.sock:/var/run/docker.sock
    extra_hosts:
      - "host.docker.internal:host-gateway"