Working in Restricted Networks: Proxies, APT, Docker & Offline Installs

proxy_and_offline_setup.md

Working in Restricted Networks: Proxies, APT, Docker & Offline Installs

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🌐 APT Proxy

⚠️ TODO: Add configuration for HTTP/HTTPS proxy in APT (/etc/apt/apt.conf.d/)

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🐳 Docker Proxy

⚠️ TODO: Add systemd-based proxy configuration for Docker daemon

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💻 Terminal Proxy

⚠️ TODO: Add environment variable setup (http_proxy, https_proxy, etc.)

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📦 Offline Package Installation Using apt-rdepends

This guide shows how to download a package with all its dependencies on an online machine and install it later on an offline system.

🧠 Overview

We will:

1. Use apt-rdepends to list all dependencies
2. Download all required .deb files
3. Transfer them to an offline machine
4. Install everything locally

🌐 Step 1: Prepare on ONLINE machine

1. Update package index

sudo apt update

2. Install apt-rdepends

sudo apt install apt-rdepends

3. Create a working directory

mkdir ~/offline-packages
cd ~/offline-packages

4. Download package + dependencies

Example for acl:

apt download $(apt-rdepends acl | grep -v "^ ")

🔍 Explanation:

• apt-rdepends acl → lists all dependencies recursively
• grep -v "^ " → removes indented lines (keeps only package names)
• apt download → downloads .deb files without installing

💾 Step 2: Transfer to OFFLINE machine

Copy the directory:

~/offline-packages

📴 Step 3: Install on OFFLINE machine

1. Navigate to directory

cd ~/offline-packages

2. Install all packages

sudo dpkg -i *.deb

⚠️ Handling Dependency Issues

If dpkg reports missing dependencies:

sudo apt install -f

Note: This may fail without internet if something was missed. Ensure all dependencies were downloaded.

🧪 Tips

• Verify architecture:

dpkg --print-architecture