Install Docker

Run every command on this page in the VS Code terminal connected to the Debian container.

Update Debian

apt update
apt full-upgrade -y
apt install -y ca-certificates curl
install -m 0755 -d /etc/apt/keyrings
curl -fsSL https://download.docker.com/linux/debian/gpg -o /etc/apt/keyrings/docker.asc
chmod a+r /etc/apt/keyrings/docker.asc

Add Docker’s official repository:

cat > /etc/apt/sources.list.d/docker.sources <<EOF
Types: deb
URIs: https://download.docker.com/linux/debian
Suites: $(. /etc/os-release && echo "$VERSION_CODENAME")
Components: stable
Architectures: $(dpkg --print-architecture)
Signed-By: /etc/apt/keyrings/docker.asc
EOF
apt update
apt install -y docker-ce docker-ce-cli containerd.io docker-buildx-plugin docker-compose-plugin

Verify Docker and Compose:

docker run --rm hello-world
docker compose version

Save a clean starting point

In Proxmox, select the Debian container, open Snapshots, choose Take Snapshot, name it docker-clean, and create it.

This snapshot preserves the clean Docker installation. If a later experiment goes badly, you can return to this exact state instead of rebuilding the container.

Docker works, and you have your first safety net.