CentOS - Nov 2023 - emulate ARM ?

Hi guys.

How do you emulate AMR arch - I mean, with what's in distro 
&| SIGs repos as oppose to do-it-yourself?

many thanks, L.

On 14/11/2023 21:44, lejeczek via CentOS wrote:
> Hi guys.
>
> How do you emulate AMR arch - I mean, with what's in 
> distro &| SIGs repos as oppose to do-it-yourself?
>
surely I meant ARM, surely :)

On Nov 14, 2023, at 13:44, lejeczek via CentOS <centos at centos.org>
wrote:
> 
> How do you emulate AMR arch
With QEMU:

$ uname -r
5.14.0-284.30.1.el9_2.x86_64
$ sudo dnf install qemu-user-static-aarch64
$ docker pull --platform=linux/arm64 tangentsoft/iperf3
$ docker export $(docker create --name iperf3 tangentsoft/iperf3) >
iperf3.tar
$ tar xf iperf3.tar 
$ file bin/iperf3
bin/iperf3: ELF 64-bit LSB executable, ARM aarch64, version 1 (SYSV), statically
linked, BuildID[sha1]=254575ed4ae36c21c317691a8008f3382eb7225e, stripped
$ bin/iperf3 -s
-----------------------------------------------------------
Server listening on 5201 (test #1)
-----------------------------------------------------------

That?s an ARM64 binary running on x86_64 via the magic of the kernel?s binfmt
feature <https://docs.kernel.org/admin-guide/binfmt-misc.html>.

The use of Docker in this context is incidental, giving me a way to give me a
way to share a small yet useful ARM64 binary with you for testing. However,
Docker also uses QEMU in this fashion:

$ docker run iperf3
WARNING: image platform (linux/arm64) does not match the expected platform
(linux/amd64)

That?s the same binary but now running inside the container we created above
before extracting the statically-linked binary from it via a tarball. Docker
yells about the platform mismatch, but it then does run.