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# 🐳 Docker Ubuntu Setup Guide with SSH & Local Chat Server Access (Onion link) labs.play-with-docker.com

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Join our telegram channel: https://t.me/LinuxClassesEFXTv
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Go to https://labs.play-with-docker.com/ or setup docker in local machine
Paste the public keys we are going to generate in in local machine to the location ~/.ssh/authorized_keys

Generate ssh keys in local machine
$ mkdir ~/sshserver
$ cd sshserver
$ ssh-keygen -t ed25519 (Enter the phrase 2 times)

# Paste the keys to the lab.play-with-docker.com in 
vi ~/.ssh/authorized_keys

# Connect to machine labs.play***
chmod 600 keyname
ssh -i ~/sshserver/keyname ********************.labs.play-with-docker.com

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## Step 1: Pull the Ubuntu Docker Image
docker pull ubuntu

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## Step 2: Create and Start the Docker Container
docker run -dit --name chatserver -p 2222:22 -p 8080:8080 ubuntu

#EXPLAIN:
Syntax Part	Explanation
docker run	This is the base Docker command to create and start a new container from an image.
-d	Detached mode — runs the container in the background. You won’t see its output directly.
-i	Interactive mode — keeps STDIN open for input, useful when working inside the container.
-t	TTY (terminal) — allocates a pseudo-terminal. Allows you to run shell/bash commands.
--name sshbox	Assigns a custom name to the container (sshbox in this case) for easier reference.
-p 2222:22	Port mapping → Maps host port 2222 to container’s port 22 (commonly used by SSH).
-p 8080:8080	Maps host port 8080 to container’s 8080 — useful for running a web server.
ubuntu	The base image to use  here, we’re pulling and running the official Ubuntu image.
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## Step 3: Access the Container
docker exec -it chatserver bash

EXPLAIN:
docker exec	Runs a command inside an already running container.
-i	Interactive mode — keeps STDIN open so you can type commands.
-t	TTY (pseudo-terminal) — gives you a usable terminal inside the container.
sshbox	The name of the container you want to connect to (as set earlier).
bash	The command you want to run inside the container — here it's bash shell.
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## Step 4: Set Up Inside the Container
apt update && apt upgrade -y;apt install -y openssh-server python3-full curl wget php vim sudo unzip net-tools

sudo passwd root

## Step 7: Enable SSH Login
nano /etc/ssh/sshd_config

# Set the following:
PermitRootLogin yes
PasswordAuthentication yes

# Then restart SSH:
mkdir -p /var/run/sshd
service ssh restart

## Step 9: Shared Directory
mkdir -p /root/shared

# Try to connect to ssh in docker
ssh root@localhost

## Step 8: 	This detaches you from a Docker container’s terminal without stopping it.
Ctrl + P then Ctrl + Q

# Try to connect outside the docker container
ssh root@localhost

# Create and activate Python virtual environment
python3 -m venv myenv
source myenv/bin/activate

# Install pyngrok
pip install pyngrok
# ngrok config add-authtoken YOUR_AUTH_TOKEN
ngrok config add-authtoken  **************************************

# Start ngrok tcp 2222
ngrok tcp 2222

# Then forward SCP: (join our telegram to get the file)
scp -P PORT chat.zip root@IPADDRESS:/root/shared

# Close the tunnel once copied
ctrl + c


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## Step 6: Resume the docker container
docker start -ai chatserver

EXPLAIN:
Syntax Part	Explanation
docker start	Starts a stopped container (does not create a new one).
-a	Attach — connects your terminal to the container’s STDOUT/STDERR output.
-i	Interactive mode — keeps STDIN open so you can interact with the container.
sshbox	The name of the container you want to start (defined earlier with --name).
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## Step 11: Start local werb server in background 
php -S 0.0.0.0:8080 > /dev/null 2>&1 &

EXPLAIN:
php -S 0.0.0.0:8080	Starts PHP’s built-in server on all interfaces (0.0.0.0) and listens on port 8080. Useful for serving a local website or PHP app.
> /dev/null	Redirects standard output (stdout) to /dev/null, essentially hides normal output.
2>&1	Redirects standard error (stderr) to the same place as stdout — i.e., also hidden.
&	Runs the whole command in the background, so your terminal is free for other tasks.
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## Detaches from Docker container AGAIN
Ctrl + P then Ctrl + Q

## Step 12: Start http server
ngrok http localhost:8080

## Step 13: Reattach to Container (Optional)
docker attach sshbox

## Fix SSH WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED!
# Error: Host key verification failed

# Solution:
vi ~/.ssh/known_hosts
# Delete line with: [localhost]:2222

# Retry SSH:
ssh root@localhost -p 2222

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✅ Step-by-Step: Expose Your PHP Server via Tor
🛠️ 1. Install Tor
On Ubuntu/Debian:
sudo apt update
sudo apt install tor

📂 2. Edit Tor Configuration
sudo vi /etc/tor/torrc

At the end, add the following lines:
HiddenServiceDir /var/lib/tor/php_hidden_service/
HiddenServicePort 80 127.0.0.1:8080

🔄 3. Restart Tor
sudo systemctl restart tor

🧪 Example Combined Setup
php -S 127.0.0.1:8080 > /dev/null 2>&1 &

✅ Workaround: Start Tor Manually (Without systemd)
tor &

✅ Check Tor Output
cat /var/lib/tor/php_hidden_service/hostname

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Create onion link in termux
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# Set up a Tor-accessible PHP website on Termux

# Step 1: Update & install required packages
pkg update && pkg upgrade -y
pkg install tor php wget git -y

# Step 2: Create PHP site
mkdir -p ~/website
cat << 'EOF' > ~/website/index.php
<?php
echo "Hello, Dark Web!";
?>
EOF
# Get in to project root
chmod -R 755 ~/website
chmod -w index.php
cd ~/website

# Start PHP server
php -S 127.0.0.1:8080 

or

php -S 127.0.0.1:8080 -t /sdcard/web

or

python3 -m http.server 8080

# Step 3: Configure Tor hidden service
mkdir -p ~/.tor/hidden_service
chmod 700 ~/.tor/hidden_service

cat << 'EOF' > ~/.torrc
HiddenServiceDir /data/data/com.termux/files/home/.tor/hidden_service/
HiddenServicePort 80 127.0.0.1:8080
EOF

# Step 4: Start Tor service
tor

# Step 5: Get the .onion link
cat ~/.tor/hidden_service/hostname

# Done! Visit page