OSX Docker Build: How can I see the full build output? (--progress=plain not the solution!)

Question

I just got a MacBook from work and I am using it to build docker images. Usually, the docker build shows the full log (i.e. ls -la showing the cwd). Thats at least what I'm used to from my linux machine.

On the macbook however, it only shows a brief overview: (actual console output)

 => [internal] load build definition from Dockerfile                                                                                                                                                                                          0.0s
 => => transferring dockerfile: 40B                                                                                                                                                                                                           0.0s
 => [internal] load .dockerignore                                                                                                                                                                                                             0.0s
 => => transferring context: 2B                                                                                                                                                                                                               0.0s
 => [internal] load metadata for docker.io/library/debian:stretch-slim                                                                                                                                                                        1.1s
 => [internal] load build context                                                                                                                                                                                                             0.0s
 => => transferring context: 58B                                                                                                                                                                                                              0.0s
 => [1/16] FROM docker.io/library/debian:stretch-slim@sha256:eb436e834ba416c45359aa0709febef17fdea65ab6a8f4db12016aa2fa63be0c                                                                                                                 0.0s
 => CACHED [2/16] RUN apt-get update && apt-get upgrade -y                                                                                                                                                                                    0.0s
 => CACHED [3/16] RUN apt-get install wget -y                                                                                                                                                                                                 0.0s
 => CACHED [4/16] RUN wget https://dev.mysql.com/get/Downloads/MySQL-5.7/mysql-5.7.22-linux-glibc2.12-x86_64.tar.gz                                                                                                                           0.0s
 => CACHED [5/16] RUN tar -zxvf mysql-5.7.22-linux-glibc2.12-x86_64.tar.gz                                                                                                                                                                    0.0s
 => CACHED [6/16] RUN mv mysql-5.7.22-linux-glibc2.12-x86_64 mysql-5.7.22                                                                                                                                                                     0.0s
 => CACHED [7/16] RUN ls -la                                                                                                                                                                                                                  0.0s
 => CACHED [8/16] RUN mv mysql-5.7.22 /usr/local/                                                                                                                                                                                             0.0s
 => CACHED [9/16] RUN groupadd mysql                                                                                                                                                                                                          0.0s
 => CACHED [10/16] RUN useradd -r -s /sbin/nologin -g mysql mysql -d /usr/local/mysql                                                                                                                                                         0.0s
 => CACHED [11/16] RUN chown -R mysql /usr/local/mysql-5.7.22/                                                                                                                                                                                0.0s
 => CACHED [12/16] RUN chgrp -R mysql /usr/local/mysql-5.7.22/                                                                                                                                                                                0.0s
 => CACHED [13/16] COPY my.cnf /etc/                                                                                                                                                                                                          0.0s
 => CACHED [14/16] COPY startup.sh .                                                                                                                                                                                                          0.0s
 => CACHED [15/16] RUN ls -la                                                                                                                                                                                                                 0.0s
 => exporting to image                                                                                                                                                                                                                        0.0s
 => => exporting layers                                                                                                                                                                                                                       0.0s
 => => writing image sha256:d93a0842352d0980be6ba4b57fdd6cad18818b7527bedecfb706e416b7fb6062                                                                                                                                                  0.0s
 => => naming to docker.io/library/customsql

Steps 7 and 15 are supposed to show me the results, but this is just omitted. (I know, its the cached result, but it didn't show up, when I changed the Dockerfile and rebuild the layer as well).

setting --progress=plain didn't do any good. In fact it just changed the color from purple to white (HideThePainHarold.jpg).

Any help will be greatly appreciated.

simonslocombe · Accepted Answer · 2021-03-16 22:30:15Z

21

Just set export DOCKER_BUILDKIT=0 in your shell....

answered Mar 16, 2021 at 22:30

simonslocombe

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2 Comments

simonslocombe Over a year ago

If you are using buildx for multi-arch work - then this wont work. Instead use this env var... export BUILDKIT_PROGRESS=plain

Eric Platon Over a year ago

I cannot remember in 2021, but in 2023 the plain format is quite verbose, typically 3 lines for each line, as it logs a line, a hash, and a done message. BUILDKIT_PROGRESS is either auto (default), plain or tty, none of them gets back the former behaviour of "simple" plain output. A pity or missing something?

mirekphd · Accepted Answer · 2023-07-23 12:01:43Z

7

Found the answer myself: apparently Docker build on OSX is automatically configured to use BuildKit, which disguises a lot of the default debug output.

I removed the option {"buildkit": true} from daemon.json config file and it works.

edited Jul 23, 2023 at 12:01

mirekphd

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answered Dec 16, 2020 at 13:00

Codebaard

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3 Comments

ranma2913 Over a year ago

Thank you this saved my butt. Without the default build output it's hard to debug complex steps in the docker-build process.

chocalaca Over a year ago

Removed what exactly? Which json? daemon.json?

kosciej16 Over a year ago

@chocalaca It's the option {"buildkit": true} in daemon.json. On MacOs you can find it now under Docker desktop icon (whale) -> preferences -> Docker Engine.

Adiii · Accepted Answer · 2021-05-15 10:52:50Z

6

In addition to Simons Answer, if you are looking for permanent setting.

To disable docker BuildKit by default, set daemon configuration in /etc/docker/daemon.json feature to true and restart the daemon:

{ "features": { "buildkit": false } }

answered May 15, 2021 at 10:52

Adiii

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