Question 192584 in Docker Question posted in
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Docker image looks different – jenkins/jenkins in mac systems

When I run the following docker image in my mac(intel)

jenkins/jenkins

I get the following file structure:

drwxr-xr-x   1 root root 4096 Jun 23 11:13 .
drwxr-xr-x   1 root root 4096 Jun 23 11:13 ..
-rwxr-xr-x   1 root root    0 Jun 23 11:13 .dockerenv
drwxr-xr-x   1 root root 4096 Jun 20 14:11 bin
drwxr-xr-x   2 root root 4096 Apr  2 11:55 boot
drwxr-xr-x   5 root root  340 Jun 23 11:13 dev
drwxr-xr-x   1 root root 4096 Jun 23 11:13 etc
drwxr-xr-x   2 root root 4096 Apr  2 11:55 home
drwxr-xr-x   1 root root 4096 Jun 12 00:00 lib
drwxr-xr-x   2 root root 4096 Jun 12 00:00 lib64
drwxr-xr-x   2 root root 4096 Jun 12 00:00 media
drwxr-xr-x   2 root root 4096 Jun 12 00:00 mnt
drwxr-xr-x   1 root root 4096 Jun 20 14:11 opt
dr-xr-xr-x 224 root root    0 Jun 23 11:13 proc
drwx------   1 root root 4096 Jun 23 05:50 root
drwxr-xr-x   1 root root 4096 Jun 23 11:13 run
drwxr-xr-x   1 root root 4096 Jun 20 14:10 sbin
drwxr-xr-x   2 root root 4096 Jun 12 00:00 srv
dr-xr-xr-x  13 root root    0 Jun 23 11:13 sys
drwxrwxrwt   1 root root 4096 Jun 23 11:13 tmp
drwxr-xr-x   1 root root 4096 Jun 12 00:00 usr
drwxr-xr-x   1 root root 4096 Jun 20 14:11 var

When i run the same image in mac(M1), I get some changes in file structure.
The noticeable one that cause me an error is that i dont find lib64 directory here in this container.

The following the directory structure:

drwxr-xr-x   1 root root 4096 Jun 23 11:21 .
drwxr-xr-x   1 root root 4096 Jun 23 11:21 ..
-rwxr-xr-x   1 root root    0 Jun 23 11:21 .dockerenv
drwxr-xr-x   1 root root 4096 Jun 20 14:15 bin
drwxr-xr-x   2 root root 4096 Apr  2 11:55 boot
drwxr-xr-x   5 root root  340 Jun 23 11:21 dev
drwxr-xr-x   1 root root 4096 Jun 23 11:21 etc
drwxr-xr-x   2 root root 4096 Apr  2 11:55 home
drwxr-xr-x   1 root root 4096 Jun 12 00:00 lib
drwxr-xr-x   2 root root 4096 Jun 12 00:00 media
drwxr-xr-x   2 root root 4096 Jun 12 00:00 mnt
drwxr-xr-x   1 root root 4096 Jun 20 14:15 opt
dr-xr-xr-x 208 root root    0 Jun 23 11:21 proc
drwx------   1 root root 4096 Jun 20 14:15 root
drwxr-xr-x   3 root root 4096 Jun 12 00:00 run
drwxr-xr-x   1 root root 4096 Jun 20 14:12 sbin
drwxr-xr-x   2 root root 4096 Jun 12 00:00 srv
dr-xr-xr-x  13 root root    0 Jun 23 11:21 sys
drwxrwxrwt   1 root root 4096 Jun 23 11:21 tmp
drwxr-xr-x   1 root root 4096 Jun 12 00:00 usr
drwxr-xr-x   1 root root 4096 Jun 20 14:15 var

I dont see lib64 dir here. Just the lib directory.

Any idea about this difference? Docker containers should be same, be it hosted in any architecture?, if they are the same images? Correct me!

Thanks!

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2

Answers


  1. 0

    Docker images are indeed built for different architectures. See, for example, for the image you provided under the column "OS/ARCH": https://hub.docker.com/r/jenkins/jenkins/tags

    See also the docker documentation for multi-platform images:

    Docker images can support multiple platforms, which means that a single image may contain variants for different architectures, and sometimes for different operating systems, such as Windows.

    When running an image with multi-platform support, docker automatically selects the image that matches your OS and architecture.

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  2. 0

    No, Container image for different architectures will be different. in your case both Mac machines have different architecture intel x86 M1 Arm

    if you want to pull specific architecture image you can provide --platform flag

    docker pull --platform linux/arm64 alpine:latest
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