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Installing Docker Engine and running your first container is the quickest way to internalize the registry → image → container flow. The docker run hello-world command pulls a tiny image from Docker Hub, creates a container from it, executes one binary, and exits — touching every layer of the system in a few seconds. Once you have seen that round-trip, every later concept (tags, layers, caches) clicks faster.
Install Docker Engine on a fresh cloud VM and trace what happens during docker run hello-world.
docker run hello-world and read the output line-by-line — identify the four steps it claims Docker performed.docker pull alpine:3.20 then docker run alpine:3.20 echo hi and confirm the second command does NOT re-pull (check docker events in another terminal).docker info and note the values of Storage Driver, Cgroup Version, and Server Version for your host.Use these three in order. Each builds on the one before.
In one paragraph, explain what happens when I type `docker run hello-world`, like I'm new to it.
Walk me through the exact sequence of HTTP calls the Docker daemon makes to Docker Hub during a first-time `docker run hello-world`, step by step.
Given an air-gapped network with no Docker Hub access, explain how you would bootstrap a working Docker Engine and pre-load a base image so that `docker run` works for developers.
# On Ubuntu 24.04 (e.g., an EC2 t3.small):
sudo apt-get update
sudo apt-get install -y ca-certificates curl
sudo install -m 0755 -d /etc/apt/keyrings
sudo curl -fsSL https://download.docker.com/linux/ubuntu/gpg -o /etc/apt/keyrings/docker.asc
echo "deb [arch=$(dpkg --print-architecture) signed-by=/etc/apt/keyrings/docker.asc] https://download.docker.com/linux/ubuntu $(. /etc/os-release && echo "$VERSION_CODENAME") stable" | sudo tee /etc/apt/sources.list.d/docker.list
sudo apt-get update && sudo apt-get install -y docker-ce docker-ce-cli containerd.io
sudo usermod -aG docker $USER && newgrp docker
docker version
docker run hello-world