docker info
Description
Display system-wide information
Usage
docker info [OPTIONS]
Options
| Name, shorthand | Default | Description |
--format , -f | Format the output using the given Go template |
Parent command
| Command | Description |
|---|---|
| docker | The base command for the Docker CLI. |
Extended description
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.
If a format is specified, the given template will be executed instead of the default format. Go’s text/template package describes all the details of the format.
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
Show output
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
Client:
Debug Mode: false
Server:
Containers: 14
Running: 3
Paused: 1
Stopped: 10
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: false
Username: gordontheturtle
Registry: https://index.docker.io/v1/
Insecure registries:
myinsecurehost:5000
127.0.0.0/8
Show debugging output
Here is a sample output for a daemon running on Ubuntu, using the overlay2 storage driver and a node that is part of a 2-node swarm:
$ docker -D info
Client:
Debug Mode: true
Server:
Containers: 14
Running: 3
Paused: 1
Stopped: 10
Images: 52
Server Version: 1.13.0
Storage Driver: overlay2
Backing Filesystem: extfs
Supports d_type: true
Native Overlay Diff: false
Logging Driver: json-file
Cgroup Driver: cgroupfs
Plugins:
Volume: local
Network: bridge host macvlan null overlay
Swarm: active
NodeID: rdjq45w1op418waxlairloqbm
Is Manager: true
ClusterID: te8kdyw33n36fqiz74bfjeixd
Managers: 1
Nodes: 2
Orchestration:
Task History Retention Limit: 5
Raft:
Snapshot Interval: 10000
Number of Old Snapshots to Retain: 0
Heartbeat Tick: 1
Election Tick: 3
Dispatcher:
Heartbeat Period: 5 seconds
CA Configuration:
Expiry Duration: 3 months
Root Rotation In Progress: false
Node Address: 172.16.66.128 172.16.66.129
Manager Addresses:
172.16.66.128:2477
Runtimes: runc
Default Runtime: runc
Init Binary: docker-init
containerd version: 8517738ba4b82aff5662c97ca4627e7e4d03b531
runc version: ac031b5bf1cc92239461125f4c1ffb760522bbf2
init version: N/A (expected: v0.13.0)
Security Options:
apparmor
seccomp
Profile: default
Kernel Version: 4.4.0-31-generic
Operating System: Ubuntu 16.04.1 LTS
OSType: linux
Architecture: x86_64
CPUs: 2
Total Memory: 1.937 GiB
Name: ubuntu
ID: H52R:7ZR6:EIIA:76JG:ORIY:BVKF:GSFU:HNPG:B5MK:APSC:SZ3Q:N326
Docker Root Dir: /var/lib/docker
Debug Mode: true
File Descriptors: 30
Goroutines: 123
System Time: 2016-11-12T17:24:37.955404361-08:00
EventsListeners: 0
Http Proxy: http://test:[email protected]:8080
Https Proxy: https://test:[email protected]:8080
No Proxy: localhost,127.0.0.1,docker-registry.somecorporation.com
Registry: https://index.docker.io/v1/
WARNING: No swap limit support
Labels:
storage=ssd
staging=true
Experimental: false
Insecure Registries:
127.0.0.0/8
Registry Mirrors:
http://192.168.1.2/
http://registry-mirror.example.com:5000/
Live Restore Enabled: false
The global -D option causes all docker commands to output debug information.
Format the output
You can also specify the output format:
$ docker info --format '{{json .}}'
{"ID":"I54V:OLXT:HVMM:TPKO:JPHQ:CQCD:JNLC:O3BZ:4ZVJ:43XJ:PFHZ:6N2S","Containers":14, ...}
Run docker info on Windows
Here is a sample output for a daemon running on Windows Server 2016:
E:\docker>docker info Client: Debug Mode: false Server: Containers: 1 Running: 0 Paused: 0 Stopped: 1 Images: 17 Server Version: 1.13.0 Storage Driver: windowsfilter Windows: Logging Driver: json-file Plugins: Volume: local Network: nat null overlay Swarm: inactive Default Isolation: process Kernel Version: 10.0 14393 (14393.206.amd64fre.rs1_release.160912-1937) Operating System: Windows Server 2016 Datacenter OSType: windows Architecture: x86_64 CPUs: 8 Total Memory: 3.999 GiB Name: WIN-V0V70C0LU5P ID: NYMS:B5VK:UMSL:FVDZ:EWB5:FKVK:LPFL:FJMQ:H6FT:BZJ6:L2TD:XH62 Docker Root Dir: C:\control Debug Mode: false Registry: https://index.docker.io/v1/ Insecure Registries: 127.0.0.0/8 Registry Mirrors: http://192.168.1.2/ http://registry-mirror.example.com:5000/ Live Restore Enabled: false
Warnings about kernel support
If your operating system does not enable certain capabilities, you may see warnings such as one of the following, when you run docker info:
WARNING: Your kernel does not support swap limit capabilities. Limitation discarded.
WARNING: No swap limit support
You can ignore these warnings unless you actually need the ability to limit these resources, in which case you should consult your operating system’s documentation for enabling them. Learn more.
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https://docs.docker.com/engine/reference/commandline/info/