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moby--moby/docs/reference/commandline/system_df.md
Gaetan de Villele 248c699ec8 fix frontmatter keywords value type (string, instead of []string) in /docs/reference 
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system df The system df command description and usage system, data, usage, disk

system df

Usage:	docker system df [OPTIONS]

Show docker filesystem usage

Options:
      --help      Print usage
  -v, --verbose   Show detailed information on space usage

The docker system df command displays information regarding the amount of disk space used by the docker daemon.

By default the command will just show a summary of the data used:

$ docker system df
TYPE                TOTAL               ACTIVE              SIZE                RECLAIMABLE
Images              5                   2                   16.43 MB            11.63 MB (70%)
Containers          2                   0                   212 B               212 B (100%)
Local Volumes       2                   1                   36 B                0 B (0%)

A more detailed view can be requested using the -v, --verbose flag:

$ docker system df -v
Images space usage:

REPOSITORY          TAG                 IMAGE ID            CREATED             SIZE                SHARED SIZE         UNIQUE SIZE         CONTAINERS
my-curl             latest              b2789dd875bf        6 minutes ago       11 MB               11 MB               5 B                 0
my-jq               latest              ae67841be6d0        6 minutes ago       9.623 MB            8.991 MB            632.1 kB            0
<none>              <none>              a0971c4015c1        6 minutes ago       11 MB               11 MB               0 B                 0
alpine              latest              4e38e38c8ce0        9 weeks ago         4.799 MB            0 B                 4.799 MB            1
alpine              3.3                 47cf20d8c26c        9 weeks ago         4.797 MB            4.797 MB            0 B                 1

Containers space usage:

CONTAINER ID        IMAGE               COMMAND             LOCAL VOLUMES       SIZE                CREATED             STATUS                      NAMES
4a7f7eebae0f        alpine:latest       "sh"                1                   0 B                 16 minutes ago      Exited (0) 5 minutes ago    hopeful_yalow
f98f9c2aa1ea        alpine:3.3          "sh"                1                   212 B               16 minutes ago      Exited (0) 48 seconds ago   anon-vol

Local Volumes space usage:

NAME                                                               LINKS               SIZE
07c7bdf3e34ab76d921894c2b834f073721fccfbbcba792aa7648e3a7a664c2e   2                   36 B
my-named-vol                                                       0                   0 B
  • SHARED SIZE is the amount of space that an image shares with another one (i.e. their common data)
  • UNIQUE SIZE is the amount of space that is only used by a given image
  • SIZE is the virtual size of the image, it is the sum of SHARED SIZE and UNIQUE SIZE

Note that network information is not shown because it doesn't consume the disk space.

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