ERROR: permission denied while trying to connect to the Docker daemon socket at unix:///var/run/docker.sock: Head "http://%2Fvar%2Frun%2Fdocker.sock/_ping": dial unix /var/run/docker.sock: connect: permission denied

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If the error "ERROR: permission denied while trying to connect to the Docker daemon socket at unix:///var/run/docker.sock: Head "http://%2Fvar%2Frun%2Fdocker.sock/_ping": dial unix /var/run/docker.sock: connect: permission denied" persists then

By default, Docker commands require root privileges. Adding your user to the docker group allows you to execute Docker commands without needing sudo.

sudo usermod -aG docker $USER

After running this command, you’ll need to log out and log back in to apply the group changes:

newgrp docker

Check if you can run Docker commands now:

docker ps

And if still error persists, restart the machine.

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The error ERROR: failed to solve: exit code: 1 occurring on the # syntax=docker/dockerfile:1 line suggests that Docker is unable to interpret the Dockerfile syntax directive. This could be due to:

1. Docker Version Compatibility: The # syntax=docker/dockerfile:1 directive is used with BuildKit, a feature introduced in newer versions of Docker. If your Docker installation does not support BuildKit or if it is not enabled, this directive can cause issues.

Solutions:

1. Check Docker Version

Ensure your Docker version supports BuildKit (version 18.09+).

docker --version

If it's an older version, update Docker to the latest version.

2. Enable Docker BuildKit

If you are running a compatible Docker version, you might need to explicitly enable BuildKit. You can do this by setting the environment variable:

export DOCKER_BUILDKIT=1

Then try building the Docker image again:

docker build -t <image-name> .

Alternatively, you can enable BuildKit permanently by editing the Docker daemon configuration:

• Edit the Docker daemon config file /etc/docker/daemon.json:

{
  "features": {
    "buildkit": true
  }
}

• Then restart Docker:

sudo systemctl restart docker

3. Remove the Syntax Directive

If you're not using any specific BuildKit features, you can remove the # syntax=docker/dockerfile:1 line entirely. The Dockerfile should work fine without it.

Here’s the updated Dockerfile without the syntax directive:

Updated Dockerfile (Without BuildKit Directive):

# Use the official Ubuntu base image
FROM ubuntu:latest

# Install required packages in a single step with cache cleanup
RUN apt-get update && \
    apt-get install -y --no-install-recommends \
    git \
    curl \
    unzip \
    ca-certificates \
    gnupg \
    lsb-release && \
    apt-get clean && \
    rm -rf /var/lib/apt/lists/*

# Set up Node.js LTS
RUN curl -sL https://deb.nodesource.com/setup_lts.x | bash - && \
    apt-get install -y nodejs && \
    apt-get clean && \
    rm -rf /var/lib/apt/lists/*

# Download and install ngrok
RUN curl -sSL https://ngrok-agent.s3.amazonaws.com/ngrok.asc | tee /etc/apt/trusted.gpg.d/ngrok.asc >/dev/null && \
    echo "deb https://ngrok-agent.s3.amazonaws.com buster main" | tee /etc/apt/sources.list.d/ngrok.list && \
    apt-get update && \
    apt-get install -y ngrok && \
    apt-get clean && \
    rm -rf /var/lib/apt/lists/*

# Install tmux
RUN apt-get update && apt-get install -y tmux && \
    apt-get clean && \
    rm -rf /var/lib/apt/lists/*

# Install PM2 globally using npm
RUN npm install -g pm2

Now, try building the Dockerfile again:

docker build -t <image-name> .

Removing the BuildKit syntax directive should resolve the issue if you’re not specifically relying on BuildKit features.