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Getting Started with Docker

Working with Docker Images

Estimated reading: 3 minutes 106 views

Tested Infrastructure

Platform Number of Instance Reading Time
Play with Docker 1 5 min

Pre-requisite

  • Create an account with DockerHub
  • Open PWD Platform on your browser
  • Click on Add New Instance on the left side of the screen to bring up Alpine OS instance on the right side

Listing the Docker Images

$ docker images

REPOSITORY          TAG                 IMAGE ID            CREATED             SIZE
hello-world         latest              4ab4c602aa5e        6 weeks ago         1.84kB

Show all images (default hides intermediate images)

docker images -a
REPOSITORY          TAG                 IMAGE ID            CREATED             SIZE
hello-world         latest              4ab4c602aa5e        6 weeks ago         1.84kB

List images by name and tag

The docker images command takes an optional [REPOSITORY[:TAG]] argument that restricts the list to images that match the argument. If you specify REPOSITORY but no TAG, the docker images command lists all images in the given repository.

To demo this, let us pull all various versions of alpine OS

docker pull alpine:3.6
docker pull alpine:3.7
docker pull alpine:3.8
docker pull alpine:3.9

[node4] (local) root@192.168.0.20 ~
$ docker images
REPOSITORY          TAG                 IMAGE ID            CREATED             SIZE
alpine              3.6                 43773d1dba76        7 days ago          4.03MB
alpine              3.7                 6d1ef012b567        7 days ago          4.21MB
alpine              3.8                 dac705114996        7 days ago          4.41MB
alpine              3.9                 5cb3aa00f899        7 days ago          5.53MB

[node4] (local) root@192.168.0.20 ~
$ docker images alpine:3.7
REPOSITORY          TAG                 IMAGE ID            CREATED             SIZE
alpine              3.7                 6d1ef012b567        7 days ago          4.21MB

List the full length image IDs

$ docker images --no-trunc
REPOSITORY          TAG                 IMAGE ID                                                                  CREATED
     SIZE
alpine              3.6                 sha256:43773d1dba76c4d537b494a8454558a41729b92aa2ad0feb23521c3e58cd0440   7 days ago
     4.03MB
alpine              3.7                 sha256:6d1ef012b5674ad8a127ecfa9b5e6f5178d171b90ee462846974177fd9bdd39f   7 days ago
     4.21MB
alpine              3.8                 sha256:dac7051149965716b0acdcab16380b5f4ab6f2a1565c86ed5f651e954d1e615c   7 days ago
     4.41MB
alpine              3.9                 sha256:5cb3aa00f89934411ffba5c063a9bc98ace875d8f92e77d0029543d9f2ef4ad0   7 days ago
     5.53MB

Listing out images with filter

$ docker images
REPOSITORY          TAG                 IMAGE ID            CREATED             SIZE
ubuntu              latest              94e814e2efa8        3 days ago          88.9MB
alpine              3.6                 43773d1dba76        7 days ago          4.03MB
alpine              3.7                 6d1ef012b567        7 days ago          4.21MB
alpine              3.8                 dac705114996        7 days ago          4.41MB
alpine              3.9                 5cb3aa00f899        7 days ago          5.53MB

If you want to filter out just alpine

$ docker images --filter=reference='alpine'
REPOSITORY          TAG                 IMAGE ID            CREATED             SIZE
alpine              3.6                 43773d1dba76        7 days ago          4.03MB
alpine              3.7                 6d1ef012b567        7 days ago          4.21MB
alpine              3.8                 dac705114996        7 days ago          4.41MB
alpine              3.9                 5cb3aa00f899        7 days ago          5.53MB

Explanation

The [REPOSITORY[:TAG]] value must be an “exact match”.

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