To check disk usage of the Docker container with ID e9a21548ff1c on Ubuntu, you have several options:
Method 1: Check from inside the container
docker exec e9a21548ff1c df -h
This shows disk usage of filesystems mounted inside the container.
Method 2: Check container’s writable layer size
docker system df -v
This shows detailed disk usage for all containers, including your specific container.
Method 3: Inspect container filesystem from host
sudo du -sh /var/lib/docker/containers/e9a21548ff1c*
This shows the size of the container’s writable layer on the host filesystem.
Method 4: Real-time container stats
docker stats e9a21548ff1c --no-stream
This shows CPU, memory, network, and block I/O usage (though not total disk usage).
Method 5: Check specific directories inside container
docker exec e9a21548ff1c du -sh /path/to/directory
Replace /path/to/directory with the specific path you want to check.
Method 6: Get detailed container information
docker inspect e9a21548ff1c | grep -i size
Most commonly used: Method 1 (docker exec e9a21548ff1c df -h) gives you a quick overview of disk usage from the container’s perspective, while Method 2 (docker system df -v) shows how much space the container is using on your host system.