Proxy Config

To route system-wide traffic through Proxy server (http://squid.cs.ait.ac.th:3128),

you need to configure environment variables, the APT package manager, and optionally Docker.

1.Configure System-Wide Environment Variables:

Edit the global environment file so all terminal sessions and system processes use the proxy.

Open the file in a text editor:

Bash 
sudo nano /etc/environment

Add the following lines at the bottom:

Bash 
HTTP_PROXY="http://squid.cs.ait.ac.th:3128/"
HTTPS_PROXY="http://squid.cs.ait.ac.th:3128/"
http_proxy="http://squid.cs.ait.ac.th:3128/"
https_proxy="http://squid.cs.ait.ac.th:3128/"
NO_PROXY="localhost,127.0.0.1,::1"
no_proxy="localhost,127.0.0.1,::1"

Save and exit (Ctrl+O, Enter, then Ctrl+X), then apply the changes to your current session:

Bash 
source /etc/environment

2.Configure APT Package Manager:

APT does not automatically use system environment variables, so it requires its own configuration file.

Create a new APT configuration file:

Bash 
sudo nano /etc/apt/apt.conf.d/99proxy

Paste the following configuration:

Plaintext 
Acquire::http::Proxy "http://squid.cs.ait.ac.th:3128/";
Acquire::https::Proxy "http://squid.cs.ait.ac.th:3128/";

Save and exit, then verify by running sudo apt update.

3.Configure Docker Daemon Proxy (Optional):

If you are running Docker containers, configure the systemd service override for Docker.

Create a configuration directory for the Docker service:

Bash 
sudo mkdir -p /etc/systemd/system/docker.service.d

Create the proxy configuration file:

Bash 
sudo nano /etc/systemd/system/docker.service.d/http-proxy.conf

Add your configuration:

Ini, TOML 
[Service]
Environment="HTTP_PROXY=http://squid.cs.ait.ac.th:3128"
Environment="HTTPS_PROXY=http://squid.cs.ait.ac.th:3128"
Environment="NO_PROXY=localhost,127.0.0.1,::1"

Reload systemd and restart Docker to apply:

Bash 
sudo systemctl daemon-reload
sudo systemctl restart docker

Proxy for server and Docker