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Hi have recently started writing Dockerfile From amazonlinux:latest , i can't seem to figure out why groupadd commnd wont work. I have 2 versions , it works in the first one and it doesnt in the 2nd one. The only difference in the 2nd is I added few more packages to be installed in the yum command.

Dockerfile_v1 - this works

FROM amazonlinux:latest
RUN yum install -y   shadow-utils.x86_64 && \
    yum -y update; yum clean all && \
    rm -fr /var/cache/yum
RUN groupadd -g 10001 test
ADD init /opt/init
CMD /opt/init/start.sh

docker build -t test:v1 .

[+] Building 0.7s (9/9) FINISHED
 => [internal] load .dockerignore                                                                                                                                                                         0.0s
 => => transferring context: 2B                                                                                                                                                                           0.0s
 => [internal] load build definition from Dockerfile                                                                                                                                                      0.0s
 => => transferring dockerfile: 259B                                                                                                                                                                      0.0s
 => [internal] load metadata for docker.io/library/amazonlinux:latest                                                                                                                                     0.3s
 => [1/4] FROM docker.io/library/amazonlinux:latest@sha256:85c8f169ab712d0c5f3fc6616b851b9b9ad0f895daf465fa1bcc95185697bf31                                                                               0.0s
 => [internal] load build context                                                                                                                                                                         0.0s
 => => transferring context: 56B                                                                                                                                                                          0.0s
 => CACHED [2/4] RUN yum install -y   shadow-utils.x86_64 &&     yum -y update; yum clean all &&     rm -fr /var/cache/yum                                                                                0.0s
 => [3/4] RUN groupadd -g 10001 test                                                                                                                                                                      0.3s
 => [4/4] ADD init /opt/init                                                                                                                                                                              0.1s
 => exporting to image                                                                                                                                                                                    0.0s
 => => exporting layers                                                                                                                                                                                   0.0s
 => => writing image sha256:0d3c36470209a665c52cd51285036d99d598ce07ad90815706d0c25ecfef5e54                                                                                                              0.0s
 => => naming to docker.io/library/test:v1

Dockerfile_v2 - this doesnt work - the only addition being added glibc.i686 libstdc++ libstdc++.i686 to yum install

FROM amazonlinux:latest
RUN yum install -y  glibc.i686 libstdc++ libstdc++.i686 shadow-utils.x86_64 && \
    yum -y update; yum clean all && \
    rm -fr /var/cache/yum
RUN groupadd -g 10001 test
ADD init /opt/init
CMD /opt/init/start.sh

docker build -t test:v2 .

[+] Building 0.9s (7/8)
 => [internal] load build definition from Dockerfile                                                                                                                                                      0.0s
 => => transferring dockerfile: 294B                                                                                                                                                                      0.0s
 => [internal] load .dockerignore                                                                                                                                                                         0.0s
 => => transferring context: 2B                                                                                                                                                                           0.0s
 => [internal] load metadata for docker.io/library/amazonlinux:latest                                                                                                                                     0.6s
 => [1/4] FROM docker.io/library/amazonlinux:latest@sha256:85c8f169ab712d0c5f3fc6616b851b9b9ad0f895daf465fa1bcc95185697bf31                                                                               0.0s
 => [internal] load build context                                                                                                                                                                         0.0s
 => => transferring context: 56B                                                                                                                                                                          0.0s
 => CACHED [2/4] RUN yum install -y  glibc.i686 libstdc++ libstdc++.i686 shadow-utils.x86_64 &&     yum -y update; yum clean all &&     rm -fr /var/cache/yum                                             0.0s
 => ERROR [3/4] RUN groupadd -g 10001 test                                                                                                                                                                0.3s
------
 > [3/4] RUN groupadd -g 10001 test:
#0 0.268 /bin/sh: line 1: groupadd: command not found
------
Dockerfile:8
--------------------
   6 |         rm -fr /var/cache/yum
   7 |
   8 | >>> RUN groupadd -g 10001 test
   9 |
  10 |     ADD init /opt/init
--------------------
ERROR: failed to solve: process "/bin/sh -c groupadd -g 10001 test" did not complete successfully: exit code: 127

This is cut down version of my actual Dockerfile but this shows the issues well. Please let me know what am I missing here?

imit
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  • 2

1 Answers1

1

Try running your yum install command interactively:

$ docker run -it --rm amazonlinux:latest bash
bash-5.2# yum install -y  glibc.i686 libstdc++ libstdc++.i686 shadow-utils.x86_64
[...]
Last metadata expiration check: 0:00:02 ago on Sun Mar 19 13:07:58 2023.
No match for argument: glibc.i686
Package libstdc++-11.3.1-4.amzn2023.0.2.x86_64 is already installed.
No match for argument: libstdc++.i686
Error: Unable to find a match: glibc.i686 libstdc++.i686

The install command fails, which means it doesn't install the shadowutils package, which means that your image won't have the groupadd command.

It looks like amazonlinux doesn't include the i686 architecture packages.

When you're debugging this sort of problem, in addition to just starting up a container and running the command interactively, you can also add --progress=plain to the docker build command line to see the output of commands as they run:

$ docker build --no-cache  --progress=plain .
#1 [internal] load .dockerignore
#1 transferring context: 2B done
#1 DONE 0.0s

#2 [internal] load build definition from Dockerfile
#2 transferring dockerfile: 236B done
#2 DONE 0.0s

#3 [internal] load metadata for docker.io/library/amazonlinux:latest
#3 DONE 0.0s

#4 [1/2] FROM docker.io/library/amazonlinux:latest
#4 CACHED

#5 [2/2] RUN yum install -y  glibc.i686 libstdc++ libstdc++.i686 shadow-utils.x86_64 &&     yum -y update; yum clean all &&     rm -fr /var/cache/yum
#5 1.482 Amazon Linux 2023 repository                    9.8 MB/s |  11 MB     00:01
#5 2.894 Last metadata expiration check: 0:00:01 ago on Sun Mar 19 13:10:36 2023.
#5 3.097 No match for argument: glibc.i686
#5 3.099 Package libstdc++-11.3.1-4.amzn2023.0.2.x86_64 is already installed.
#5 3.101 No match for argument: libstdc++.i686
#5 3.106 Error: Unable to find a match: glibc.i686 libstdc++.i686
#5 3.204 9 files removed
#5 DONE 3.3s

Lastly, the reason your docker build wasn't failing was because you chose to use ; instead of && to connect commands in your RUN statement. If instead of this:

RUN yum install -y  glibc.i686 libstdc++ libstdc++.i686 shadow-utils.x86_64 && \
    yum -y update; yum clean all && \
    rm -fr /var/cache/yum

You wrote this:

RUN yum install -y  glibc.i686 libstdc++ libstdc++.i686 shadow-utils.x86_64 && \
    yum -y update && yum clean all && \
    rm -fr /var/cache/yum

Then the problem would have been much more obvious; the build would have failed like this:

 => ERROR [2/2] RUN yum install -y  glibc.i686 libstdc++ libstdc++.i686 shadow-utils.x86_64 &&     yum -y update && yum clean all &&     rm -fr /var/cache/yum                                                3.1s
------
 > [2/2] RUN yum install -y  glibc.i686 libstdc++ libstdc++.i686 shadow-utils.x86_64 &&     yum -y update && yum clean all &&     rm -fr /var/cache/yum:
#0 1.350 Amazon Linux 2023 repository                     11 MB/s |  11 MB     00:01
#0 2.761 Last metadata expiration check: 0:00:01 ago on Sun Mar 19 13:12:40 2023.
#0 2.968 No match for argument: glibc.i686
#0 2.969 Package libstdc++-11.3.1-4.amzn2023.0.2.x86_64 is already installed.
#0 2.971 No match for argument: libstdc++.i686
#0 2.977 Error: Unable to find a match: glibc.i686 libstdc++.i686
------
Dockerfile:2
--------------------
   1 |     FROM amazonlinux:latest
   2 | >>> RUN yum install -y  glibc.i686 libstdc++ libstdc++.i686 shadow-utils.x86_64 && \
   3 | >>>     yum -y update && yum clean all && \
   4 | >>>     rm -fr /var/cache/yum
   5 |     #RUN groupadd -g 10001 test
--------------------
ERROR: failed to solve: process "/bin/sh -c yum install -y  glibc.i686 libstdc++ libstdc++.i686 shadow-utils.x86_64 &&     yum -y update && yum clean all &&     rm -fr /var/cache/yum" did not complete successfully: exit code: 1
larsks
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