/docker_registry_api_bash_functions

Primary LanguageShell

Docker Registry API Bash Functions

Introduction

The Docker Registry API Bash Functions is a set of Bash functions which provide a high level query interface for the Docker Registry HTTP API V2 to a Docker Registry.

For more information on the Docker Registry HTTP API V2 refer to https://docs.docker.com/registry/spec/api/.

Setup

  1. The Docker Registry API Bash Functions require the curl and jq commands.

    To install curl and jq if they are not currently installed:

    • Ubuntu

      sudo apt-get update -qq
sudo apt-get install curl jq -y

    • RHEL/CentOS

      sudo yum makecache fast
sudo yum install curl jq -y

    • MacOS

      If you are running MacOS you can install curl and jq with Homebrew https://brew.sh/.

      brew install curl jq

  2. You also need to define your Docker Registry credentials in environment variables:

    • You must export the following Bash variables which specify your Docker Registry credentials.

      • DOCKER_USER - Your Docker Registry user account.
      • DOCKER_PASSWORD - Your Docker Registry user account password.

      Example:

      export DOCKER_USER="my_docker_registry_user_account"
export DOCKER_PASSWORD="my_docker_registry_user_account_password"

  3. Source the Docker Registry API Bash Functions file docker_registry_api_bash_functions. Assuming that the file docker_registry_api_bash_functions is in the current directory:

    source ./docker_registry_api_bash_functions

Available Functions

  1. get_docker_registry_api_token - authenticates with the Docker Registry using your Docker credentials. This is called by the other functions below.

  2. get_docker_repo_tags - retrieves all Tags for a Docker Repository.

    For more details on Tags refer to https://docs.docker.com/engine/reference/commandline/image_tag/.

  3. get_docker_image_content_digest - retrieves the Docker Content Digest for a Docker Image.

    For more details on the Docker Content Digest refer to https://docs.docker.com/registry/spec/api/#content-digests.

  4. get_docker_image_manifest - retrieves the Manifest for a Docker Image.

    For more details on Manifests refer to https://docs.docker.com/registry/spec/manifest-v2-2/#image-manifest-field-descriptions.

  5. get_docker_image_manifest_list - retrieves the Manifest List for a Docker Image (Multi Architecture Support). If the Docker Image does not have a Manifest list, then the Manifest for the image that matches the Docker Operating System and Architecture is returned (if there is one). For more details on the Manifest List refer to https://docs.docker.com/registry/spec/manifest-v2-2/#manifest-list.

  6. get_docker_image_config_blob - retrieves the configuration Blob for a Docker Image.

    For more details on Blobs refer to https://docs.docker.com/registry/spec/api/#blob.

Command Help

get_docker_repo_tags

🐳  gforghetti:~:$ get_docker_repo_tags -h

Usage: get_docker_repo_tags -r docker-repo [-t {image|plugin}] [-k]
 -r is the Docker Repo and must be specified.
 -t {image|plugin} Default is image
 -k disable SSL verification for an insecure private Docker Trusted Registry

get_docker_image_content_digest

🐳  gforghetti:~:$ get_docker_image_content_digest -h

Usage: get_docker_image_content_digest -i docker-image [-t {image|plugin}] [-k]
 -i is the Docker Image and must be specified.
 -t {image|plugin} Default is image
 -k disable SSL verification for an insecure private Docker Trusted Registry

get_docker_image_manifest

🐳  gforghetti:~: $ get_docker_image_manifest -h

Usage: get_docker_image_manifest -i docker-image [-t {image|plugin}] [-k]
 -i is the Docker Image and must be specified.
 -t {image|plugin} Default is image
 -k disable SSL verification for an insecure private Docker Trusted Registry

get_docker_image_manifest_list

🐳  gforghetti:~: $ get_docker_image_manifest_list -h

Usage: get_docker_image_manifest_list -i docker-image [-t {image|plugin}] [-k]
 -i is the Docker Image and must be specified.
 -t {image|plugin} Default is image
 -k disable SSL verification for an insecure private Docker Trusted Registry

get_docker_image_config_blob

🐳  gforghetti:~: $ get_docker_image_config_blob -h

Usage: get_docker_image_config_blob -i docker-image [-t {image|plugin}] [-k]
 -i is the Docker Image and must be specified.
 -t {image|plugin} Default is image
 -k disable SSL verification for an insecure private Docker Trusted Registry

Examples

To retrieve the Docker Content Digest for the Docker Official Image "ubuntu:latest":

Note: You must prefix the Docker Image with library/ for querying information on Docker Official Images.

Example:

🐳  gforghetti:~:$ get_docker_image_content_digest -i library/ubuntu:latest

Output:

sha256:5f4bdc3467537cbbe563e80db2c3ec95d548a9145d64453b06939c4592d67b6d

You can pull the image using the Docker Content Digest

🐳  gforghetti:[~] $ docker image pull ubuntu@sha256:5f4bdc3467537cbbe563e80db2c3ec95d548a9145d64453b06939c4592d67b6d

sha256:5f4bdc3467537cbbe563e80db2c3ec95d548a9145d64453b06939c4592d67b6d: Pulling from library/ubuntu
6b98dfc16071: Pull complete
4001a1209541: Pull complete
6319fc68c576: Pull complete
b24603670dc3: Pull complete
97f170c87c6f: Pull complete
Digest: sha256:5f4bdc3467537cbbe563e80db2c3ec95d548a9145d64453b06939c4592d67b6d

To retrieve the Docker Content Digest for the Docker Image "172.16.129.76/gforghetti/tomcat-wildbook:latest" which is in an insecure private Docker Trusted Registry:

Example:

🐳  gforghetti:~:$ get_docker_image_content_digest -i 172.16.129.76/gforghetti/tomcat-wildbook:latest -k

Output:

sha256:66a82c818640de6dc42c3bcc786b7b3c8e669168d0b65b65126681948e7636e4"

To retrieve the tags for the Docker Official "httpd" repository:

Example:

🐳  gforghetti:~:$ get_docker_repo_tags -r library/httpd | jq -r '.tags[]'

Output:

2-alpine
2.2-alpine
2.2.29
2.2.31-alpine
2.2.31
2.2.32-alpine
2.2.32
2.2.34-alpine
2.2.34
2.2
2.4-alpine
2.4.10
2.4.12
2.4.16
2.4.17
2.4.18
2.4.20
2.4.23-alpine
2.4.23
2.4.25-alpine
2.4.25
2.4.27-alpine
2.4.27
2.4.28-alpine
2.4.28
2.4.29-alpine
2.4.29
2.4.32-alpine
2.4.32
2.4.33-alpine
2.4.33
2.4
2
alpine
latest

To retrieve the tags for the Docker Image "172.16.129.76/gforghetti/tomcat-wildbook:latest" which is in an insecure private Docker Trusted Registry:

🐳  gforghetti:~:$ get_docker_repo_tags -r 172.16.129.76/gforghetti/tomcat-wildbook -k | jq

{
  "name": "gforghetti/tomcat-wildbook",
  "tags": [
    "latest"
  ]
}

To retrieve the Image Manifest for the Docker Official "mysql:5.7" image:

Example:

🐳  gforghetti:~:$ get_docker_image_manifest -i library/mysql:5.7 | jq

Output:

{
  "schemaVersion": 2,
  "mediaType": "application/vnd.docker.distribution.manifest.v2+json",
  "config": {
    "mediaType": "application/vnd.docker.container.image.v1+json",
    "size": 6869,
    "digest": "sha256:66bc0f66b7af6ba3ea96582685d3afcd6dff93c2f8999da0ffadd67b280db548"
  },
  "layers": [
    {
      "mediaType": "application/vnd.docker.image.rootfs.diff.tar.gzip",
      "size": 22496975,
      "digest": "sha256:683abbb4ea60e108164f1d351e7bcf13daf45941137d800086447874df05f48e"
    },
    {
      "mediaType": "application/vnd.docker.image.rootfs.diff.tar.gzip",
      "size": 1747,
      "digest": "sha256:0550d17aeefaf608f887e92fa2ccb50b43e4f7b65d354d61c97217aa4a4cab80"
    },
    {
      "mediaType": "application/vnd.docker.image.rootfs.diff.tar.gzip",
      "size": 4498578,
      "digest": "sha256:7e26605ddd77b819dfb23d28e1992d8f435142b1b70c8aceed3e94de1c69ca46"
    },
    {
      "mediaType": "application/vnd.docker.image.rootfs.diff.tar.gzip",
      "size": 1270486,
      "digest": "sha256:9882737bd15fd5c289096db0652851ae9b0aba5ea95758b091fb35dc3544b151"
    },
    {
      "mediaType": "application/vnd.docker.image.rootfs.diff.tar.gzip",
      "size": 115,
      "digest": "sha256:999c06ab75f6240facacea7f7bef87355c1b3b0b2c99df58c165d30a9703f57e"
    },
    {
      "mediaType": "application/vnd.docker.image.rootfs.diff.tar.gzip",
      "size": 12091205,
      "digest": "sha256:c71d695f9937f6f3880061b5e3d2963fc9ae02ea92e1cba8e168292940f79ba3"
    },
    {
      "mediaType": "application/vnd.docker.image.rootfs.diff.tar.gzip",
      "size": 22327,
      "digest": "sha256:c38f847c1491e59cd3757df5afcd9deadfef755eb5ec055707912a96dafcf79f"
    },
    {
      "mediaType": "application/vnd.docker.image.rootfs.diff.tar.gzip",
      "size": 220,
      "digest": "sha256:74f9c61f40bfe8a9b0bf1195ba1ea56fa0768aec0564def3b27431e979382cf4"
    },
    {
      "mediaType": "application/vnd.docker.image.rootfs.diff.tar.gzip",
      "size": 83462574,
      "digest": "sha256:30b252a90a12371e016b860e205611d66ed65bc0a21b06fd2e5e8841786f1920"
    },
    {
      "mediaType": "application/vnd.docker.image.rootfs.diff.tar.gzip",
      "size": 2868,
      "digest": "sha256:9f92ebb7da5511661cabe08b0a34e8eea5f223f26948af6aa904e236eb7fa465"
    },
    {
      "mediaType": "application/vnd.docker.image.rootfs.diff.tar.gzip",
      "size": 121,
      "digest": "sha256:90303981d2767b76a3d019764dbaa4f7006868073a0bb6fe4a338fa3c3afaee8"
    }
  ]
}

To retrieve the Digest of the 1st layer from the Image Manifest for the Docker Official "mysql:5.7" image:

Example:

🐳  gforghetti:~:$ get_docker_image_manifest -i library/mysql:5.7 | jq -r '.layers[0].digest'

Output:

sha256:683abbb4ea60e108164f1d351e7bcf13daf45941137d800086447874df05f48e

To retrieve the Digest and Size of the 1st Layer from the Image Manifest for the Docker Official "mysql:5.7" image:

Example:

🐳  gforghetti:~:$ get_docker_image_manifest -i library/mysql:5.7 | jq -r '.layers[0] | .digest, .size'

Output:

sha256:683abbb4ea60e108164f1d351e7bcf13daf45941137d800086447874df05f48e
22496975

To retrieve the Manifest List for the Docker Official "ubuntu:latest" image:

Example:

🐳  gforghetti:~:$ get_docker_image_manifest_list -i library/ubuntu:latest | jq 'if .mediaType?=="application/vnd.docker.distribution.manifest.list.v2+json" then . else error("Docker Image is Not Multi Architecture!") end'

Output:

{
  "schemaVersion": 2,
  "mediaType": "application/vnd.docker.distribution.manifest.list.v2+json",
  "manifests": [
    {
      "mediaType": "application/vnd.docker.distribution.manifest.v2+json",
      "size": 1357,
      "digest": "sha256:e7def0d56013d50204d73bb588d99e0baa7d69ea1bc1157549b898eb67287612",
      "platform": {
        "architecture": "amd64",
        "os": "linux"
      }
    },
    {
      "mediaType": "application/vnd.docker.distribution.manifest.v2+json",
      "size": 1357,
      "digest": "sha256:5b5f606437e81499737fae5e4419fe331362ea306adac1823a7eeb33f60913f2",
      "platform": {
        "architecture": "arm",
        "os": "linux",
        "variant": "v7"
      }
    },
    {
      "mediaType": "application/vnd.docker.distribution.manifest.v2+json",
      "size": 1357,
      "digest": "sha256:1356a2700f74c312bff5edad20290e212123102a56545d2f1086e6313d0fe38e",
      "platform": {
        "architecture": "arm64",
        "os": "linux",
        "variant": "v8"
      }
    },
    {
      "mediaType": "application/vnd.docker.distribution.manifest.v2+json",
      "size": 1357,
      "digest": "sha256:23aaa037c5d628464967fc7586a717c020cda939bccb0bf79a367356d4fbf4cd",
      "platform": {
        "architecture": "386",
        "os": "linux"
      }
    },
    {
      "mediaType": "application/vnd.docker.distribution.manifest.v2+json",
      "size": 1357,
      "digest": "sha256:f81270f3dd7a73154db578102a0e4afa98b34f3aa009a6f4c9770874a4b34523",
      "platform": {
        "architecture": "ppc64le",
        "os": "linux"
      }
    },
    {
      "mediaType": "application/vnd.docker.distribution.manifest.v2+json",
      "size": 1357,
      "digest": "sha256:f13c8e57117a2b1373d511c0b014899ad7401142057964fce9df6c6d224fd989",
      "platform": {
        "architecture": "s390x",
        "os": "linux"
      }
    }
  ]
}

To retrieve the Manifest List for the Docker Official "ubuntu:latest" image and display the OS and Architecture for each entry:

Example:

🐳  gforghetti:[~] $ get_docker_image_manifest_list -i library/ubuntu:latest | jq -j '.manifests[].platform | .os,":",.architecture,"\n"'

Output:

linux:amd64
linux:arm
linux:arm64
linux:386
linux:ppc64le
linux:s390x

To retrieve the configuration Blob for the Docker Official "redis:latest" image:

Example:

🐳  gforghetti:~:$ get_docker_image_config_blob -i library/redis:latest | jq

Output:

{
  "architecture": "amd64",
  "config": {
    "Hostname": "",
    "Domainname": "",
    "User": "",
    "AttachStdin": false,
    "AttachStdout": false,
    "AttachStderr": false,
    "ExposedPorts": {
      "6379/tcp": {}
    },
    "Tty": false,
    "OpenStdin": false,
    "StdinOnce": false,
    "Env": [
      "PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin",
      "GOSU_VERSION=1.10",
      "REDIS_VERSION=4.0.10",
      "REDIS_DOWNLOAD_URL=http://download.redis.io/releases/redis-4.0.10.tar.gz",
      "REDIS_DOWNLOAD_SHA=1db67435a704f8d18aec9b9637b373c34aa233d65b6e174bdac4c1b161f38ca4"
    ],
    "Cmd": [
      "redis-server"
    ],
    "ArgsEscaped": true,
    "Image": "sha256:d84b18dfd4e7c0574c1feba2bd8efd51a90dd7706f16f33b0bbdcc15b78d589b",
    "Volumes": {
      "/data": {}
    },
    "WorkingDir": "/data",
    "Entrypoint": [
      "docker-entrypoint.sh"
    ],
    "OnBuild": [],
    "Labels": null
  },
  "container": "fa3f101e57e36e0c8ff4e779043ac51c9aa06bf1acd8af74fadc4b55097fdd3b",
  "container_config": {
    "Hostname": "fa3f101e57e3",
    "Domainname": "",
    "User": "",
    "AttachStdin": false,
    "AttachStdout": false,
    "AttachStderr": false,
    "ExposedPorts": {
      "6379/tcp": {}
    },
    "Tty": false,
    "OpenStdin": false,
    "StdinOnce": false,
    "Env": [
      "PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin",
      "GOSU_VERSION=1.10",
      "REDIS_VERSION=4.0.10",
      "REDIS_DOWNLOAD_URL=http://download.redis.io/releases/redis-4.0.10.tar.gz",
      "REDIS_DOWNLOAD_SHA=1db67435a704f8d18aec9b9637b373c34aa233d65b6e174bdac4c1b161f38ca4"
    ],
    "Cmd": [
      "/bin/sh",
      "-c",
      "#(nop) ",
      "CMD [\"redis-server\"]"
    ],
    "ArgsEscaped": true,
    "Image": "sha256:d84b18dfd4e7c0574c1feba2bd8efd51a90dd7706f16f33b0bbdcc15b78d589b",
    "Volumes": {
      "/data": {}
    },
    "WorkingDir": "/data",
    "Entrypoint": [
      "docker-entrypoint.sh"
    ],
    "OnBuild": [],
    "Labels": {}
  },
  "created": "2018-06-27T01:18:26.908214534Z",
  "docker_version": "17.06.2-ce",
  "history": [
    {
      "created": "2018-06-26T21:25:25.408453148Z",
      "created_by": "/bin/sh -c #(nop) ADD file:28fbc9fd012eef72780d1c75fc2b0969d13f0138f735035335ab4b76793da2da in / "
    },
    {
      "created": "2018-06-26T21:25:25.735257578Z",
      "created_by": "/bin/sh -c #(nop)  CMD [\"bash\"]",
      "empty_layer": true
    },
    {
      "created": "2018-06-27T01:15:28.126881138Z",
      "created_by": "/bin/sh -c groupadd -r redis && useradd -r -g redis redis"
    },
    {
      "created": "2018-06-27T01:15:28.341993652Z",
      "created_by": "/bin/sh -c #(nop)  ENV GOSU_VERSION=1.10",
      "empty_layer": true
    },
    {
      "created": "2018-06-27T01:15:50.240137625Z",
      "created_by": "/bin/sh -c set -ex; \t\tfetchDeps=\" \t\tca-certificates \t\tdirmngr \t\tgnupg \t\twget \t\"; \tapt-get update; \tapt-get install -y --no-install-recommends $fetchDeps; \trm -rf /var/lib/apt/lists/*; \t\tdpkgArch=\"$(dpkg --print-architecture | awk -F- '{ print $NF }')\"; \twget -O /usr/local/bin/gosu \"https://github.com/tianon/gosu/releases/download/$GOSU_VERSION/gosu-$dpkgArch\"; \twget -O /usr/local/bin/gosu.asc \"https://github.com/tianon/gosu/releases/download/$GOSU_VERSION/gosu-$dpkgArch.asc\"; \texport GNUPGHOME=\"$(mktemp -d)\"; \tgpg --keyserver ha.pool.sks-keyservers.net --recv-keys B42F6819007F00F88E364FD4036A9C25BF357DD4; \tgpg --batch --verify /usr/local/bin/gosu.asc /usr/local/bin/gosu; \tgpgconf --kill all; \trm -r \"$GNUPGHOME\" /usr/local/bin/gosu.asc; \tchmod +x /usr/local/bin/gosu; \tgosu nobody true; \t\tapt-get purge -y --auto-remove $fetchDeps"
    },
    {
      "created": "2018-06-27T01:17:51.049852464Z",
      "created_by": "/bin/sh -c #(nop)  ENV REDIS_VERSION=4.0.10",
      "empty_layer": true
    },
    {
      "created": "2018-06-27T01:17:51.257582616Z",
      "created_by": "/bin/sh -c #(nop)  ENV REDIS_DOWNLOAD_URL=http://download.redis.io/releases/redis-4.0.10.tar.gz",
      "empty_layer": true
    },
    {
      "created": "2018-06-27T01:17:51.463335483Z",
      "created_by": "/bin/sh -c #(nop)  ENV REDIS_DOWNLOAD_SHA=1db67435a704f8d18aec9b9637b373c34aa233d65b6e174bdac4c1b161f38ca4",
      "empty_layer": true
    },
    {
      "created": "2018-06-27T01:18:24.449938413Z",
      "created_by": "/bin/sh -c set -ex; \t\tbuildDeps=' \t\twget \t\t\t\tgcc \t\tlibc6-dev \t\tmake \t'; \tapt-get update; \tapt-get install -y $buildDeps --no-install-recommends; \trm -rf /var/lib/apt/lists/*; \t\twget -O redis.tar.gz \"$REDIS_DOWNLOAD_URL\"; \techo \"$REDIS_DOWNLOAD_SHA *redis.tar.gz\" | sha256sum -c -; \tmkdir -p /usr/src/redis; \ttar -xzf redis.tar.gz -C /usr/src/redis --strip-components=1; \trm redis.tar.gz; \t\tgrep -q '^#define CONFIG_DEFAULT_PROTECTED_MODE 1$' /usr/src/redis/src/server.h; \tsed -ri 's!^(#define CONFIG_DEFAULT_PROTECTED_MODE) 1$!\\1 0!' /usr/src/redis/src/server.h; \tgrep -q '^#define CONFIG_DEFAULT_PROTECTED_MODE 0$' /usr/src/redis/src/server.h; \t\tmake -C /usr/src/redis -j \"$(nproc)\"; \tmake -C /usr/src/redis install; \t\trm -r /usr/src/redis; \t\tapt-get purge -y --auto-remove $buildDeps"
    },
    {
      "created": "2018-06-27T01:18:25.292917585Z",
      "created_by": "/bin/sh -c mkdir /data && chown redis:redis /data"
    },
    {
      "created": "2018-06-27T01:18:25.532325332Z",
      "created_by": "/bin/sh -c #(nop)  VOLUME [/data]",
      "empty_layer": true
    },
    {
      "created": "2018-06-27T01:18:25.804741333Z",
      "created_by": "/bin/sh -c #(nop) WORKDIR /data",
      "empty_layer": true
    },
    {
      "created": "2018-06-27T01:18:26.205704849Z",
      "created_by": "/bin/sh -c #(nop) COPY file:9c29fbe8374a97f9c2d953c9c8b7224554607eeb7a610a930844f2bec678265c in /usr/local/bin/ "
    },
    {
      "created": "2018-06-27T01:18:26.46062041Z",
      "created_by": "/bin/sh -c #(nop)  ENTRYPOINT [\"docker-entrypoint.sh\"]",
      "empty_layer": true
    },
    {
      "created": "2018-06-27T01:18:26.69209863Z",
      "created_by": "/bin/sh -c #(nop)  EXPOSE 6379/tcp",
      "empty_layer": true
    },
    {
      "created": "2018-06-27T01:18:26.908214534Z",
      "created_by": "/bin/sh -c #(nop)  CMD [\"redis-server\"]",
      "empty_layer": true
    }
  ],
  "os": "linux",
  "rootfs": {
    "type": "layers",
    "diff_ids": [
      "sha256:9c46f426bcb704beffafc951290ee7fe05efddbc7406500e7d0a3785538b8735",
      "sha256:5d91794593bba502923c05812ca7bebf614aafff91343af5e6bb48e35e22806e",
      "sha256:e3192998e317bb353116cc4598fc185e6ae32529cb6a25e5f3a3745b57e76d81",
      "sha256:45648ff3360d4ca2d10abb663ef56b683812add3cddc51b90f17fb52c1aba128",
      "sha256:6c0bd81580c995445802cab06b6f6be6203ab34f1a2e61c41cd1eab5b24bc25f",
      "sha256:911e1ec2b8b86cb23f80facd7153051afcbacf24fa0fd51ee0c644f8fc8ba649"
    ]
  }
}

To retrieve the "Cmd" from the configuration Blob for the Docker Official "redis:latest" image:

Example:

🐳  gforghetti:~:$ get_docker_image_config_blob -i library/redis:latest | jq -r '.config.Cmd[]'

Output:

redis-server

To retrieve the "Cmd" and "Entrypoint" from the configuration Blob for the Docker Official "redis:latest" image:

Example:

🐳  gforghetti:~:$ get_docker_image_config_blob -i library/redis:latest | jq -r '.config | .Cmd[], .Entrypoint[]'

Output:

redis-server
docker-entrypoint.sh

To retrieve the History layers which are not "empty" from the configuration Blob for the Docker Official "redis:latest" image:

Note: Only the first 80 characters of each layer is being displayed .created_by[0:80].

Example:

🐳  gforghetti:~:$ get_docker_image_config_blob -i library/redis:latest | jq  -r '.history[] | select(.empty_layer != 'true' ) | .created_by[0:80]'

Output:

/bin/sh -c #(nop) ADD file:28fbc9fd012eef72780d1c75fc2b0969d13f0138f735035335ab4
/bin/sh -c groupadd -r redis && useradd -r -g redis redis
/bin/sh -c set -ex; 		fetchDeps=" 		ca-certificates 		dirmngr 		gnupg 		wget 	";
/bin/sh -c set -ex; 		buildDeps=' 		wget 				gcc 		libc6-dev 		make 	'; 	apt-get
/bin/sh -c mkdir /data && chown redis:redis /data
/bin/sh -c #(nop) COPY file:9c29fbe8374a97f9c2d953c9c8b7224554607eeb7a610a930844

To retrieve multiple attributes ("docker_version, created, architecture, and os) from the configuration Blob for my user "gforghetti" Docker Image "tomcat-wildbook:latest":

Note: Only the first 10 characters of the created attribute are being selected .created[0:10].

Example:

🐳  gforghetti:~:$ get_docker_image_config_blob -i gforghetti/tomcat-wildbook:latest | jq -r '. | .docker_version, .created[0:10], .architecture, .os'

Output:

18.05.0-ce
2018-05-27
amd64
linux