docker images on different computers are different

I am running a docker image on 2 different computers and the contents of said image are different.

I am ensuring they are the same image by specifying the digest as such docker run -it ubuntu@sha256:f9d633ff6640178c2d0525017174a688e2c1aef28f0a0130b26bd5554491f0da /bin/bash

however when I run cat /etc/apt/sources.list I am getting very different contents. Furthermore when I try to do apt-get update && apt-get install curl -y on one computer I get 400 bad request errors and is unable to install while on the other computer it works just fine.

The bad computer has mirror URIs that are mostly from ubuntu-ports, i.e. ports.ubuntu.com/ubuntu-ports while the good computer is mostly archive.ubuntu.com

I dont believe this file is generated at runtime so I cannot figure out what is causing this discrepancy.

Solution

You have pulled the image for two different platforms. The digest you provided is the top level manifest list that has references to multiple platform specific images:

$ regctl manifest get ubuntu@sha256:f9d633ff6640178c2d0525017174a688e2c1aef28f0a0130b26bd5554491f0da
Name:        ubuntu@sha256:f9d633ff6640178c2d0525017174a688e2c1aef28f0a0130b26bd5554491f0da
MediaType:   application/vnd.oci.image.index.v1+json
Digest:      sha256:f9d633ff6640178c2d0525017174a688e2c1aef28f0a0130b26bd5554491f0da

Manifests:

  Name:      docker.io/library/ubuntu@sha256:81bba8d1dde7fc1883b6e95cd46d6c9f4874374f2b360c8db82620b33f6b5ca1
  Digest:    sha256:81bba8d1dde7fc1883b6e95cd46d6c9f4874374f2b360c8db82620b33f6b5ca1
  MediaType: application/vnd.oci.image.manifest.v1+json
  Platform:  linux/amd64

  Name:      docker.io/library/ubuntu@sha256:9089166d0211acd54441bb6a532f69e0038287edf625d62fda94784df7f07474
  Digest:    sha256:9089166d0211acd54441bb6a532f69e0038287edf625d62fda94784df7f07474
  MediaType: application/vnd.oci.image.manifest.v1+json
  Platform:  linux/arm/v7

  Name:      docker.io/library/ubuntu@sha256:ca165754e2f953a4f686409b1eb5855212f42a252462c9c50bbc3077f3b9a654
  Digest:    sha256:ca165754e2f953a4f686409b1eb5855212f42a252462c9c50bbc3077f3b9a654
  MediaType: application/vnd.oci.image.manifest.v1+json
  Platform:  linux/arm64

  Name:      docker.io/library/ubuntu@sha256:2f00029acbafa8e205f18a167658ea1546d754e79641b667b77295f9e0e77766
  Digest:    sha256:2f00029acbafa8e205f18a167658ea1546d754e79641b667b77295f9e0e77766
  MediaType: application/vnd.oci.image.manifest.v1+json
  Platform:  linux/ppc64le

  Name:      docker.io/library/ubuntu@sha256:66874e931f0e488d3d20b8276b98fa58476e537386cc893b464e2eb89de8cec8
  Digest:    sha256:66874e931f0e488d3d20b8276b98fa58476e537386cc893b464e2eb89de8cec8
  MediaType: application/vnd.oci.image.manifest.v1+json
  Platform:  linux/s390x

Checking the requested file on AMD64 shows the archive URLs:

$ regctl image cat --platform linux/amd64 ubuntu@sha256:f9d633ff6640178c2d0525017174a688e2c1aef28f0a0130b
26bd5554491f0da /etc/apt/sources.list
# See http://help.ubuntu.com/community/UpgradeNotes for how to upgrade to
# newer versions of the distribution.
deb http://archive.ubuntu.com/ubuntu/ jammy main restricted
# deb-src http://archive.ubuntu.com/ubuntu/ jammy main restricted

## Major bug fix updates produced after the final release of the
## distribution.
deb http://archive.ubuntu.com/ubuntu/ jammy-updates main restricted
# deb-src http://archive.ubuntu.com/ubuntu/ jammy-updates main restricted

## N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu
## team. Also, please note that software in universe WILL NOT receive any
## review or updates from the Ubuntu security team.
deb http://archive.ubuntu.com/ubuntu/ jammy universe
# deb-src http://archive.ubuntu.com/ubuntu/ jammy universe
deb http://archive.ubuntu.com/ubuntu/ jammy-updates universe
# deb-src http://archive.ubuntu.com/ubuntu/ jammy-updates universe

## N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu
## team, and may not be under a free licence. Please satisfy yourself as to
## your rights to use the software. Also, please note that software in
## multiverse WILL NOT receive any review or updates from the Ubuntu
## security team.
deb http://archive.ubuntu.com/ubuntu/ jammy multiverse
# deb-src http://archive.ubuntu.com/ubuntu/ jammy multiverse
deb http://archive.ubuntu.com/ubuntu/ jammy-updates multiverse
# deb-src http://archive.ubuntu.com/ubuntu/ jammy-updates multiverse

## N.B. software from this repository may not have been tested as
## extensively as that contained in the main release, although it includes
## newer versions of some applications which may provide useful features.
## Also, please note that software in backports WILL NOT receive any review
## or updates from the Ubuntu security team.
deb http://archive.ubuntu.com/ubuntu/ jammy-backports main restricted universe multiverse
# deb-src http://archive.ubuntu.com/ubuntu/ jammy-backports main restricted universe multiverse

deb http://security.ubuntu.com/ubuntu/ jammy-security main restricted
# deb-src http://security.ubuntu.com/ubuntu/ jammy-security main restricted
deb http://security.ubuntu.com/ubuntu/ jammy-security universe
# deb-src http://security.ubuntu.com/ubuntu/ jammy-security universe
deb http://security.ubuntu.com/ubuntu/ jammy-security multiverse
# deb-src http://security.ubuntu.com/ubuntu/ jammy-security multiverse

However on ARM64, they use the ports URLs:

$ regctl image cat --platform linux/arm64 ubuntu@sha256:f9d633ff6640178c2d0525017174a688e2c1aef28f0a0130b
26bd5554491f0da /etc/apt/sources.list
# See http://help.ubuntu.com/community/UpgradeNotes for how to upgrade to
# newer versions of the distribution.
deb http://ports.ubuntu.com/ubuntu-ports/ jammy main restricted
# deb-src http://ports.ubuntu.com/ubuntu-ports/ jammy main restricted

## Major bug fix updates produced after the final release of the
## distribution.
deb http://ports.ubuntu.com/ubuntu-ports/ jammy-updates main restricted
# deb-src http://ports.ubuntu.com/ubuntu-ports/ jammy-updates main restricted

## N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu
## team. Also, please note that software in universe WILL NOT receive any
## review or updates from the Ubuntu security team.
deb http://ports.ubuntu.com/ubuntu-ports/ jammy universe
# deb-src http://ports.ubuntu.com/ubuntu-ports/ jammy universe
deb http://ports.ubuntu.com/ubuntu-ports/ jammy-updates universe
# deb-src http://ports.ubuntu.com/ubuntu-ports/ jammy-updates universe

## N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu
## team, and may not be under a free licence. Please satisfy yourself as to
## your rights to use the software. Also, please note that software in
## multiverse WILL NOT receive any review or updates from the Ubuntu
## security team.
deb http://ports.ubuntu.com/ubuntu-ports/ jammy multiverse
# deb-src http://ports.ubuntu.com/ubuntu-ports/ jammy multiverse
deb http://ports.ubuntu.com/ubuntu-ports/ jammy-updates multiverse
# deb-src http://ports.ubuntu.com/ubuntu-ports/ jammy-updates multiverse

## N.B. software from this repository may not have been tested as
## extensively as that contained in the main release, although it includes
## newer versions of some applications which may provide useful features.
## Also, please note that software in backports WILL NOT receive any review
## or updates from the Ubuntu security team.
deb http://ports.ubuntu.com/ubuntu-ports/ jammy-backports main restricted universe multiverse
# deb-src http://ports.ubuntu.com/ubuntu-ports/ jammy-backports main restricted universe multiverse

deb http://ports.ubuntu.com/ubuntu-ports/ jammy-security main restricted
# deb-src http://ports.ubuntu.com/ubuntu-ports/ jammy-security main restricted
deb http://ports.ubuntu.com/ubuntu-ports/ jammy-security universe
# deb-src http://ports.ubuntu.com/ubuntu-ports/ jammy-security universe
deb http://ports.ubuntu.com/ubuntu-ports/ jammy-security multiverse
# deb-src http://ports.ubuntu.com/ubuntu-ports/ jammy-security multiverse

You can check your host platform with commands like uname.