On Nov 14, 2023, at 13:44, lejeczek via CentOS <centos@xxxxxxxxxx> 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.
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