Docker 查看远端仓库的标签和镜像大小

此接口只能获取标签，不能获取镜像大小

# 查询 URL 为 
https://registry.hub.docker.com/v1/repositories/【镜像名】/tags

# 如 centos 的所有镜像标签
https://registry.hub.docker.com/v1/repositories/centos/tags

# 用户 babygod 仓库中 centos-ssh 标签
https://registry.hub.docker.com/v1/repositories/babygod/centos-ssh/tags

接口返回的数据为 json 数据，可以通过 jq 等工具进行格式转换

[root@test-02 ~] curl -s https://registry.hub.docker.com/v1/repositories/babygod/centos-ssh/tags | jq .
[
  {
    "layer": "",
    "name": "latest"
  },
  {
    "layer": "",
    "name": "v1"
  }
]

[root@test-02 ~] curl -s https://registry.hub.docker.com/v1/repositories/babygod/centos-ssh/tags | jq -r .[].name
latest
v1

通过脚本来获取标签

[root@test-02 ~]# cat dockertags.sh 
#!/bin/bash
#

usage() {
    cat << HELP

$0  --  list all tags for a Docker image on a remote registry.

EXAMPLE:
    - list all tags for centos:
       $0 centos

    - list all php tags containing apache:
       $0 php apache

HELP
}

if [ $# -lt 1 ]; then
    usage
    exit
fi

image="$1"
tags=$(curl -s https://registry.hub.docker.com/v1/repositories/${image}/tags | jq -r .[].name)

if [ -n "$2" ]
then
    tags=$(echo "${tags}" | fgrep "$2")
fi

echo "${tags}"

# 用法如下
[root@test-02 ~]# ./dockertags.sh babygod/centos-ssh
latest
v1

Ref

• https://www.liaoyongfu.com/2018/11/d0d9ca71-85b1-4976-8291-3f0efb8f7a8c/

二、通过 docker hub v2 api 接口

此接口获取的信息比较多，包括 tag name，full_size 等等

# 查询 URL 为 ( 将 page_size 设置一个比较大的值 )
https://hub.docker.com/v2/repositories/library/【镜像名】/tags/?page_size=10000

# 如 centos 
https://hub.docker.com/v2/repositories/library/centos/tags/?page_size=100000

# 用户 babygod 仓库中 centos-ssh 
https://hub.docker.com/v2/repositories/babygod/centos-ssh/tags/?page_size=1000

# 注意：默认是 library，如果某个用户的话，就需要把 library 改成相应的用户名，如上面把 library 改成 babyggod

接口返回的数据同样为 json 数据，可以通过 jq 等工具进行格式转换

[root@test-02 ~]# curl -s https://hub.docker.com/v2/repositories/babygod/centos-ssh/tags/?page_size=10000 | jq .

# 获取标签名
[root@test-02 ~]# curl -s https://hub.docker.com/v2/repositories/babygod/centos-ssh/tags/?page_size=10000 | jq -r .results[].name                       
latest
v1

# 获取镜像大小
[root@test-02 ~]# curl -s https://hub.docker.com/v2/repositories/babygod/centos-ssh/tags/?page_size=10000 | jq -r .results[].full_size                  
82550131
82287724

# 获取对应标签和大小
[root@test-02 ~]# curl -s https://hub.docker.com/v2/repositories/babygod/centos-ssh/tags/?page_size=10000 | jq -r ‘.results[]|[.name,.full_size|tostring]|join(": ")‘ 
latest: 82550131
v1: 82287724

通过脚本来获取标签和大小

[root@test-02 ~]# cat dockertags_size.sh 
#!/bin/bash
#

usage() {
    cat << HELP

$0  --  list all tags and full_size for a Docker image on a remote registry.

EXAMPLE:
    - list all tags and full_size for centos:
       $0 centos

HELP
}

if [ $# -lt 1 ]; then
    usage
    exit
fi

fgrep -q ‘/‘ <<< "$1" && {
    image="$1"
    } || {
    image="library/$1"
}    

tags_size=$(curl -s https://hub.docker.com/v2/repositories/${image}/tags/?page_size=10000 |           jq -r ‘.results[]|[.name,.full_size|tostring]|join(" ")‘)

echo "${tags_size}" | awk ‘{printf "%-20s %.2fMB\n",$1,$2/1000000}‘

# 用法如下
[root@test-02 ~]# ./dockertags_size.sh babygod/centos-ssh
latest               82.55MB
v1                   82.29MB

Ref

• https://stackoverflow.com/questions/48856693/dockerhub-api-listing-tags
• https://stedolan.github.io/jq/manual/#Basicfilters

Docker 查看远端仓库的标签和镜像大小

原文：https://blog.51cto.com/babyshen/2431378