docker info

Learn to get system status with docker info.

docker info

docker info shows the daemon's detailed state: how many containers are running or stopped, how many images there are, the storage driver (usually overlay2), the Docker root directory, and the amount of CPU and memory.

$ docker info
Containers: 3
 Running: 1
 Paused: 0
 Stopped: 2
Images: 5
Storage Driver: overlay2
Docker Root Dir: /var/lib/docker

Disk usage

Docker takes up a lot of space over time. docker system df shows the space used by images, containers, volumes and the build cache; docker system prune cleans up the unused ones:

$ docker system df
TYPE            TOTAL     ACTIVE    SIZE      RECLAIMABLE
Images          5         2         1.2GB     800MB (66%)
Containers      3         1         20MB      15MB (75%)
$ docker system prune     # removes stopped containers, unused networks and dangling images

Exercise State and cleanup

Write three commands: show the daemon information, show the disk usage, then clean up the unused items without asking for confirmation (-f).

Show example solution

docker info
docker system df
docker system prune -f

Test yourself

Where are image and container layers stored by default on Linux?
- /etc/docker
- /home/docker
- /tmp
- /var/lib/docker
Show answer

/var/lib/docker — "Docker Root Dir" in the docker info output shows this path.
Show Docker's disk usage.
```
docker system ____
```
Show answer
```
docker system df
```
Match.

docker info

Daemon state
docker system df

Disk usage
docker system prune

Removes unused items
overlay2

Storage driver

Next lesson: The hello-world container

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