docker info

Usage:  docker info

Display system-wide information

Options:
      --help   Print usage

This command displays system wide information regarding the Docker installation. Information displayed includes the kernel version, number of containers and images. The number of images shown is the number of unique images. The same image tagged under different names is counted only once.

Depending on the storage driver in use, additional information can be shown, such as pool name, data file, metadata file, data space used, total data space, metadata space used, and total metadata space.

The data file is where the images are stored and the metadata file is where the meta data regarding those images are stored. When run for the first time Docker allocates a certain amount of data space and meta data space from the space available on the volume where /var/lib/docker is mounted.

Examples

Display Docker system information

Here is a sample output for a daemon running on Ubuntu, using the overlay storage driver and a node that is part of a 2-node swarm:

$ docker -D info
Containers: 14
 Running: 3
 Paused: 1
 Stopped: 10
Images: 52
Server Version: 1.12.0-dev
Storage Driver: overlay
 Backing Filesystem: extfs
Logging Driver: json-file
Cgroup Driver: cgroupfs
Plugins:
 Volume: local
 Network: bridge null host overlay
Swarm:
 NodeID: 0gac67oclbxq7
 Is Manager: true
 Managers: 2
 Nodes: 2
Runtimes: default
Default Runtime: default
Security Options: apparmor seccomp
Kernel Version: 4.4.0-21-generic
Operating System: Ubuntu 16.04 LTS
OSType: linux
Architecture: x86_64
CPUs: 24
Total Memory: 62.86 GiB
Name: docker
ID: I54V:OLXT:HVMM:TPKO:JPHQ:CQCD:JNLC:O3BZ:4ZVJ:43XJ:PFHZ:6N2S
Docker Root Dir: /var/lib/docker
Debug mode (client): true
Debug mode (server): true
 File Descriptors: 59
 Goroutines: 159
 System Time: 2016-04-26T10:04:06.14689342-04:00
 EventsListeners: 0
Http Proxy: http://test:test@localhost:8080
Https Proxy: https://test:test@localhost:8080
No Proxy: localhost,127.0.0.1,docker-registry.somecorporation.com
Username: svendowideit
Registry: https://index.docker.io/v1/
WARNING: No swap limit support
Labels:
 storage=ssd
 staging=true
Insecure registries:
 myinsecurehost:5000
 127.0.0.0/8

The global -D option tells all docker commands to output debug information.

The example below shows the output for a daemon running on Red Hat Enterprise Linux, using the devicemapper storage driver. As can be seen in the output, additional information about the devicemapper storage driver is shown:

$ docker info
Containers: 14
 Running: 3
 Paused: 1
 Stopped: 10
Untagged Images: 52
Server Version: 1.10.3
Storage Driver: devicemapper
 Pool Name: docker-202:2-25583803-pool
 Pool Blocksize: 65.54 kB
 Base Device Size: 10.74 GB
 Backing Filesystem: xfs
 Data file: /dev/loop0
 Metadata file: /dev/loop1
 Data Space Used: 1.68 GB
 Data Space Total: 107.4 GB
 Data Space Available: 7.548 GB
 Metadata Space Used: 2.322 MB
 Metadata Space Total: 2.147 GB
 Metadata Space Available: 2.145 GB
 Udev Sync Supported: true
 Deferred Removal Enabled: false
 Deferred Deletion Enabled: false
 Deferred Deleted Device Count: 0
 Data loop file: /var/lib/docker/devicemapper/devicemapper/data
 Metadata loop file: /var/lib/docker/devicemapper/devicemapper/metadata
 Library Version: 1.02.107-RHEL7 (2015-12-01)
Execution Driver: native-0.2
Logging Driver: json-file
Plugins:
 Volume: local
 Network: null host bridge
Kernel Version: 3.10.0-327.el7.x86_64
Operating System: Red Hat Enterprise Linux Server 7.2 (Maipo)
OSType: linux
Architecture: x86_64
CPUs: 1
Total Memory: 991.7 MiB
Name: ip-172-30-0-91.ec2.internal
ID: I54V:OLXT:HVMM:TPKO:JPHQ:CQCD:JNLC:O3BZ:4ZVJ:43XJ:PFHZ:6N2S
Docker Root Dir: /var/lib/docker
Debug mode (client): false
Debug mode (server): false
Username: xyz
Registry: https://index.docker.io/v1/
Insecure registries:
 myinsecurehost:5000
 127.0.0.0/8