Lab 27: Host reboot — what comes back and what does not

Objective

Document the difference between restart: always and restart: unless-stopped after a host reboot.

Tasks

Task 1: Set up containers with each policy

docker run -d --name reboot-always  --restart always        nginx:1.27
docker run -d --name reboot-unless  --restart unless-stopped nginx:1.27
docker run -d --name reboot-onfail  --restart on-failure     nginx:1.27
docker run -d --name reboot-no      --restart no             nginx:1.27

docker stop reboot-unless   # Mark as "manually stopped"
docker ps --format '{{.Names}}\t{{.Status}}'

Task 2: Predict

Before rebooting, predict what each container will look like after the host comes back.

Task 3: Reboot

sudo reboot

Task 4: Observe

After reboot:

docker ps -a --format '{{.Names}}\t{{.Status}}\t{{.Image}}'

Expected:

Task 5: Cleanup

docker rm -f reboot-always reboot-unless reboot-onfail reboot-no