Managing images

Figure 1203. Search images

> docker search nextcloud
NAME                       DESCRIPTION      STARS  OFFICIAL   AUTOMATED
nextcloud                  A safe home …    424    [OK]
linuxserver/nextcloud      A Nextcloud …    56
greyltc/nextcloud          Nextcloud: …     34                [OK]
wonderfall/nextcloud       All-in-one …     27                [OK]
rootlogin/nextcloud        Nextcloud …      17                [OK]
lsioarmhf/nextcloud        ARMHF based …    8
ownyourbits/nextcloudpi    NextCloud ARM …  7
...

Figure 1204. Pull image using CLI

> docker image pull alpine
Using default tag: latest
latest: Pulling from library/alpine
ff3a5c916c92: Pull complete
Digest: sha256:7df6db5aa61ae9480f52f0b3a06a140ab98d427f86d8d5de0bedab9b8df6b1c0
Status: Downloaded newer image for alpine:latest

Figure 1205. Pull Nextcloud image

> docker image pull wonderfall/nextcloud ❶
Using default tag: latest ❷
latest: Pulling from wonderfall/nextcloud
ff3a5c916c92: Already exists ❸
a542d4c3cffb: Pull complete ❹
83001cc0bea0: Pull complete
41a33c66b2c1: Pull complete
a70bf67726f3: Pull complete
fea90b3d29ac: Pull complete
Digest: sha256:472c5c7...2ca20cca45 ❺
Status: Downloaded newer image for wonderfall/nextcloud:latest

❶	Get docker image from remote server.
❷	Version defaults to «latest»: Subject to be overridden.
❸	Reference to existing «alpine» layer.
❹	Layer downloads.
❺	Hash value allowing for image verification.

Figure 1206. Nextcloud based on Alpine

‹›

Figure 1207. Inspect image

> docker image inspect dac77467ddcc
[
    {
        "Id": "sha256:dac77467ddccc2287d99558245bd34707...",
        "RepoTags": [
            "nextcloud:13.0.4"
        ],
        "RepoDigests": [
            "nextcloud@sha256:fb3e77f19b21364925e8f02..."
        ],
 ...

Figure 1208. Search an image's tags

> curl 'https://registry.hub.docker.com/v2/repositories/library/nextcloud/tags/'|\
      jq '."results"[]["name"]'  # requires «aptitude install curl jq»
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100 11856    0 11856    0     0  11856      0 --:--:-- --:--:-- --:--:-- 20371
"fpm"
"production"
"stable"
"latest"
"13"
"13.0"
"13.0.2"
"production-apache"
"stable-apache"
"apache"

Figure 1209. Nextcloud image by version

> docker image pull nextcloud:13.0.4
13.0.4: Pulling from library/nextcloud
3d77ce4481b1: Pull complete
32bfdb6043a8: Pull complete
028453741593: Pull complete
f93d7bd342a3: Pull complete
4a2fac611953: Pull complete
87fdfc7d0f94: Pull complete
Digest: sha256:fb3e77f19b21364925e8f02d6e5ad3a1 ...
Status: Downloaded newer image for nextcloud:13.0.4

Figure 1210. List images by CLI

> docker image ls
REPOSITORY            TAG      IMAGE ID       CREATED        SIZE
nextcloud             13.0.4   dac77467ddcc   3 days ago     544MB
wonderfall/nextcloud  latest   57e1fb51b334   2 months ago   328MB
alpine                latest   3fd9065eaf02   4 months ago   4.15MB

Figure 1211. Nextcloud latest image

> docker image pull nextcloud
Using default tag: latest
latest: Pulling from library/nextcloud ❶
Digest: sha256:fb3e77f19b21364925e8f02d6e5ad3a1 ... ❷
Status: Downloaded newer image for nextcloud:latest

❶	No «Pull complete» messages, image is alias of `nextcloud:13.0.4`.
❷	Digest value identical to Figure 1209, “Nextcloud image by version ”.

Figure 1212. Duplicate Nextcloud images

> docker image ls 
REPOSITORY          TAG                 IMAGE ID            CREATED             SIZE
nextcloud           13.0.4              dac77467ddcc        4 days ago          544MB
nextcloud           latest              dac77467ddcc        4 days ago          544MB
...

Figure 1213. Maven ringing a bell?

<dependency>
  <groupId>junit</groupId>           <!-- wonderfall -->
  <artifactId>junit</artifactId>     <!-- nextcloud -->
  <version>4.12</version>            <!-- 13.0.4 -->
</dependency>

Figure 1214. Un tag image by version

> docker image rm nextcloud:latest
Untagged: nextcloud:latest

> docker image ls
REPOSITORY          TAG                 IMAGE ID            CREATED             SIZE
nextcloud           13.0.4              dac77467ddcc        4 days ago          544MB
...

Figure 1215. Remove image by version

> docker image rm nextcloud:13.0.2
Untagged: nextcloud:latest
Untagged: nextcloud@sha256:c693921e69cb89cd0bee7c014280159df647e5ba87f54c895650156d973df035
Deleted: sha256:10ae267ddcf25bfe5cc059685d3d005bcfe7229b44c3a6f93e0a07795d33b5b2
Deleted: sha256:1c271f4f2f19a222cd116c771b02294c5dd596fa8a0366559061f83a0de8de3f
...
Deleted: sha256:2c833f307fd8f18a378b71d3c43c575fabdb88955a2198662938ac2a08a99928

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Introduction

Managing images