Docker image digest

1.txt

$docker image ls --digests
REPOSITORY    TAG       DIGEST                                                                    IMAGE ID       CREATED        SIZE
nginx         1.25.5    sha256:a484819eb60211f5299034ac80f6a681b06f89e65866ce91f356ed7c72af059c   8dd77ef2d82e   3 weeks ago    193MB
nginx         latest    sha256:a484819eb60211f5299034ac80f6a681b06f89e65866ce91f356ed7c72af059c   8dd77ef2d82e   3 weeks ago    193MB


$docker image inspect nginx:1.25.5 --format '{{.RepoDigests}}'
[nginx@sha256:a484819eb60211f5299034ac80f6a681b06f89e65866ce91f356ed7c72af059c]


$docker manifest inspect nginx:1.25.5
{
   "schemaVersion": 2,
   "mediaType": "application/vnd.oci.image.index.v1+json",
   "manifests": [
      {
         "mediaType": "application/vnd.oci.image.manifest.v1+json",
         "size": 2295,
         "digest": "sha256:e688fed0b0c7513a63364959e7d389c37ac8ecac7a6c6a31455eca2f5a71ab8b",
         "platform": {
            "architecture": "amd64",
            "os": "linux"
         }
      },
      {
         "mediaType": "application/vnd.oci.image.manifest.v1+json",
         "size": 841,
         "digest": "sha256:6f66f24cf574338e2e9468d63ae718203af66e5a35cc7c4af4772fc7c12884fe",
         "platform": {
            "architecture": "unknown",
            "os": "unknown"
         }
      },
      {
         "mediaType": "application/vnd.oci.image.manifest.v1+json",
         "size": 2297,
         "digest": "sha256:712bcddd8580f5a3e222b1d9fe2223cbaf3adc67ff8e41e8b2e9dd219cd922e4",
         "platform": {
            "architecture": "arm",
            "os": "linux",
            "variant": "v5"
         }
      },
      {
         "mediaType": "application/vnd.oci.image.manifest.v1+json",
         "size": 841,
         "digest": "sha256:220a9bf1d8259c50dc71e8b5707da5940f28dd8c4f3464309f752029236cc54a",
         "platform": {
            "architecture": "unknown",
            "os": "unknown"
         }
      },
      {
         "mediaType": "application/vnd.oci.image.manifest.v1+json",
         "size": 2297,
         "digest": "sha256:923e07a43e42f56c2143184e04ed230fa2d0d2b12875cb4604e2db7a31d4e4bf",
         "platform": {
            "architecture": "arm",
            "os": "linux",
            "variant": "v7"
         }
      },
      ...
   ]
}

Dockerfile

FROM nginx@sha256:a484819eb60211f5299034ac80f6a681b06f89e65866ce91f356ed7c72af059c


หรือ

FROM nginx:1.25.5@sha256:a484819eb60211f5299034ac80f6a681b06f89e65866ce91f356ed7c72af059c