CODEWITHSUNDEEP
dockerbuildx
Marvin-wtt
Marvin-wtt

Reputation: 489

Docker use local image with buildx

I am building an image for a docker container running on a different architecture. As I don't have internet access all the time, I usually just pull the image when I have internet and docker uses the local image instead of pulling a new one. After I started to build the image with buildx, this does not seem to work anymore. Is there any way to tell docker to only use the local image? When I have connection, docker seems to check wherever there is a new version available but uses the local (or cached) image as I would expect it without internet connection.

$ docker image ls
ros                     galactic          bac817d14f26   5 weeks ago    626MB

$ docker image inspect ros:galactic
...
"Architecture": "arm64",
 "Variant": "v8",
 "Os": "linux",
...

Example build command

$ docker buildx build . --platform linux/arm64
WARN[0000] No output specified for docker-container driver. Build result will only remain in the build cache. To push result image into registry use --push or to load image into docker use --load 
[+] Building 0.3s (3/3) FINISHED                                                                                                  
 => [internal] load build definition from Dockerfile                                                                         0.0s
 => => transferring dockerfile: 72B                                                                                          0.0s
 => [internal] load .dockerignore                                                                                            0.0s
 => => transferring context: 2B                                                                                              0.0s
 => ERROR [internal] load metadata for docker.io/library/ros:galactic                                                        0.0s
------
 > [internal] load metadata for docker.io/library/ros:galactic:
------
Dockerfile:1
--------------------
   1 | >>> FROM ros:galactic
   2 |     RUN "echo hello"
   3 |     
--------------------
error: failed to solve: failed to fetch anonymous token: Get "https://auth.docker.io/token?scope=repository%3Alibrary%2Fros%3Apull&service=registry.docker.io": proxyconnect tcp: dial tcp 127.0.0.1:3333: connect: connection refused

Upvotes: 20

Views: 11542

Answers (1)

zsolt
zsolt

Reputation: 1611

My workaround for this is to explicitly state the registry in the Dockerfile FROM sections, be it your own private registry or dockerhub.

For example, to use the dockerhub ubuntu:latest image, instead of just doing FROM ubuntu:latest I would write in the Dockerfile:

FROM docker.io/library/ubuntu:latest

To use myprivateregistry:5000 I would use:

FROM myprivateregistry:5000/ubuntu:latest

And also you must set --pull=false flag for the docker buildx build or DOCKER_BUILDKIT=1 docker build commands. When you have internet again you can use --pull=true again

Upvotes: 1

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