Docker Squid proxy server example

README

Create a folder named "proxy-server" and copy the files there.

Run "bash build.sh"
Then "bash run.sh"

You will have a Squid proxy server running on port 3128 (you can change the port to whatever you want)

Configure HTTP Proxy settings on IntelliJ.

Host name: localhost
Port number: 3128

Check the instructions here if you need: https://www.jetbrains.com/help/idea/settings-http-proxy.html

build.sh

#!/bin/bash

docker build -t proxy-server .

Dockerfile

# Use the official Ubuntu 20.04 image as the base
FROM ubuntu:20.04

# Set environment variables to avoid interactive installation
ENV DEBIAN_FRONTEND=noninteractive

# Update package list and install Squid
RUN apt-get update && \
    apt-get install -y squid

# Copy custom Squid configuration file
COPY squid.conf /etc/squid/squid.conf

# Expose the Squid port
EXPOSE 3128

# Run Squid in the foreground
CMD ["squid", "-N"]

run.sh

#!/bin/bash

CONTAINER_NAME="proxy-server-container"
IMAGE_NAME="proxy-server"
PORT=3128

# Check if the container is running
if docker ps --format "{{.Names}}" | grep -Eq "^${CONTAINER_NAME}\$"; then
    echo "Stopping running container..."
    docker stop $CONTAINER_NAME
    docker rm $CONTAINER_NAME
elif docker ps -a --format "{{.Names}}" | grep -Eq "^${CONTAINER_NAME}\$"; then
    echo "Removing stopped container..."
    docker rm $CONTAINER_NAME
fi

# Start the container
echo "Starting the container..."
docker run -d --name proxy-server-container -p $PORT:$PORT proxy-server

echo "Done."

squid.conf

http_port 3128
http_access allow all
cache deny all
forwarded_for delete
via off

# Enable SSL bump
ssl_bump allow all

# Don't verify server certificates
sslproxy_cert_error allow all
sslproxy_flags DONT_VERIFY_PEER

Thanks for sharing, @kryptogeist!

The sslproxy_flags directive appears to be obsolete since Squid v3.3. It appears that it should be replaced with tls_outgoing_options flags=