Error starting container on arm

[Bwvolleyball]

Hello, when I try to run this container on an arm server, all I get is this error:

exec /usr/local/bin/docker-php-entrypoint: exec format error

I'm a bit unsure where this is coming from.

This was from running the develop tag.

[Bwvolleyball]

This could be related?

https://stackoverflow.com/questions/28499844/php-scripts-get-exec-format-error-or-permission-error

[kenchan0130]

@Bwvolleyball

It appears to be working in my environment.
I may need more information about your environment and the settings you have made to solve your problem.

#48 (comment)

[Bwvolleyball]

Hey @kenchan0130 - I'm attempting to run this on a kubernetes instance with AWS Arm Graviton nodes currently - what information would you like me to try to get?

I was looking at this again, but, the error is not super helpful.

[Bwvolleyball]

I'm trying to do some detective work, and as far as I can tell it's an issue with starting PHP on arm?

The error seems to be coming from this script: https://github.com/docker-library/php/blob/master/docker-php-entrypoint - which is in the core php docker container. Do you happen to know what the start command to launch this process looks like? I'm not super familiar with PHP, so I'm not sure how to run this process outside of container.

[Bwvolleyball]

This was another interesting article: https://beebom.com/how-fix-exec-user-process-caused-exec-format-error-linux/
Maybe there's a problem with the actual arm container that was built?

[Bwvolleyball]

Also, I was looking for the develop branch, or some trace of how the arm container was built, but I couldn't find one. Do you happen to have a reference as to how this container was built, or can you commit those parts to the main branch so that I can see what was being done?

[Bwvolleyball]

One last piece of evidence:

With the PHP base container, I noticed that the different architectures are not the exact same size:

But this container's develop tag has the same size for the 2 architectures, which is curious at least. Feels like maybe there's something strange going on with the multi-arch build?

[ceininger]

Hi! I encountered the same error today. We use this image for a project's development environment, and everything works perfectly on my amd64 PC, but I recently switched to an arm (aarch64) and I'm getting the same error when I launch the container.

exec /usr/local/bin/docker-php-entrypoint: exec format error

Here's my service configuration in my docker-compose.yml

  idp:
    image: kenchan0130/simplesamlphp
    ports:
      - "8080:8080"
    environment:
      - SIMPLESAMLPHP_SP_ENTITY_ID="http://localhost"
      - SIMPLESAMLPHP_SP_ASSERTION_CONSUMER_SERVICE="http://localhost/saml/acs"
      - SIMPLESAMLPHP_SP_SINGLE_LOGOUT_SERVICE="http://localhost/saml/sls"
    volumes:
      - ./.docker/idp/authsources.php:/var/www/simplesamlphp/config/authsources.php
      - ./.docker/idp/metadata/saml20-sp-remote.php:/var/www/simplesamlphp/metadata/saml20-sp-remote.php

EDIT - More informations below
I'm using WSL2 Ubuntu 24.04 (on Windows 11)

$ uname -m
aarch64

$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description:    Ubuntu 24.04.3 LTS
Release:        24.04
Codename:       noble

$ docker image inspect 3c6ed4b8c6bd
[
    {
        "Id": "sha256:3c6ed4b8c6bdc86bb131c802ddc35f6311cb91df7f8412f50b8f159c4c19fab0",
        "RepoTags": [
            "kenchan0130/simplesamlphp:latest"
        ],
        "RepoDigests": [
            "kenchan0130/simplesamlphp@sha256:3c6ed4b8c6bdc86bb131c802ddc35f6311cb91df7f8412f50b8f159c4c19fab0"
        ],
        "Comment": "buildkit.dockerfile.v0",
        "Created": "2024-04-13T13:47:20.316071137Z",
        "Config": {
            "ExposedPorts": {
                "80/tcp": {},
                "8080/tcp": {}
            },
            "Env": [
                "PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin",
                "PHPIZE_DEPS=autoconf \t\tdpkg-dev \t\tfile \t\tg++ \t\tgcc \t\tlibc-dev \t\tmake \t\tpkg-config \t\tre2c",
                "PHP_INI_DIR=/usr/local/etc/php",
                "APACHE_CONFDIR=/etc/apache2",
                "APACHE_ENVVARS=/etc/apache2/envvars",
                "PHP_CFLAGS=-fstack-protector-strong -fpic -fpie -O2 -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64",
                "PHP_CPPFLAGS=-fstack-protector-strong -fpic -fpie -O2 -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64",
                "PHP_LDFLAGS=-Wl,-O1 -pie",
                "GPG_KEYS=39B641343D8C104B2B146DC3F9C39DC0B9698544 E60913E4DF209907D8E30D96659A97C9CF2A795A 1198C0117593497A5EC5C199286AF1F9897469DC",
                "PHP_VERSION=8.2.18",
                "PHP_URL=https://www.php.net/distributions/php-8.2.18.tar.xz",
                "PHP_ASC_URL=https://www.php.net/distributions/php-8.2.18.tar.xz.asc",
                "PHP_SHA256=44b306fc021e56441f691da6c3108788bd9e450f293b3bc70fcd64b08dd41a50",
                "HTTP_PORT=8080"
            ],
            "Entrypoint": [
                "docker-php-entrypoint"
            ],
            "Cmd": [
                "apache2-foreground"
            ],
            "WorkingDir": "/var/www/simplesamlphp",
            "Labels": {
                "git-origin": "https://github.com/kenchan0130/docker-simplesamlphp",
                "git-revision": "f3fa33e",
                "image-name": "index.docker.io/kenchan0130/simplesamlphp",
                "maintainer": "Tadayuki Onishi <tt.tanishi100@gmail.com>"
            },
            "StopSignal": "SIGWINCH"
        },
        "Architecture": "arm64",
        "Os": "linux",
        "Size": 222404129,
        "RootFS": {
            "Type": "layers",
            "Layers": [
                "sha256:1f00ff20147800878a4ebc9c283f79149a1dde5cc11d659c69d3a9c0bfeb7d4f",
                "sha256:1706a4264cc90bfc4e43ee1a421b4a1a19d948a2f7038b0b99c7d9d88b54bba8",
                "sha256:781dffa2223bb764a2c630d5e768c0cccb89d0cd78b9b2865b7d220773ce2114",
                "sha256:ee50ac85ebd750a679eacf0dd2732ebe41500b44a1dbf2809ad55412d6ad4593",
                "sha256:05769640ee185eaf214ad485b419cb976780880ca6fb50005ba48715a5d414ec",
                "sha256:8eedaabd7bf74fae412c7ee42237beb1890aa3f3c1ac1fb6d94a30d60f08c6b2",
                "sha256:4b713f2e5bc05c605a1084eba7fd4354f9a6d9ff452b5ab783dd6e77deedc8bb",
                "sha256:f0252263653a0e1dbd1bf64deb7f207630136872d0353540e871e93d6d48b08d",
                "sha256:3a1379565995c090a745e30184253928a3784dccce8b6411280a2b3a6137defa",
                "sha256:6df493e0c83c664608c0236514bac26513557745f4db7c13e5e40fa271a134d9",
                "sha256:b17ea9047c7bd6c6e111ef6cc4fac405cbf586ff807dad390271bfc4f737d8f2",
                "sha256:ebb2a52201dd48dd866f86f6c76431bad50ff5c1aa6790d8d7c76f66eb03db45",
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                "sha256:c96830046cf65b288a1c643eff0ec8c1cc422c98086208f911608e51273cfba2",
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                "sha256:61d8ce532e48fee8da3dfc436eaac4ee499e2b57fedff7fbda0aaa31c18bfd31",
                "sha256:562d049d5e0632ed39f70bb58389f3754f696b021302b9039907d8bc7f55a31d",
                "sha256:5bd7ba6f0d63daf6bff2b6edfaac17d5ed12a012b6716498dda6bb7ef03c3788",
                "sha256:23c1b765dc9265d750e3743571ab0fceec782bad032f22188a0e07c24cc071b2",
                "sha256:d12295357bdc2bd54db6727a347181b2d3100e4cb51c877c71e1fe4656029417",
                "sha256:25250ad81459b45b73180bf702dd170ed2178ec2d6b18a6dfa7aac980c17c1b9",
                "sha256:5b054563a291cac3741782248ff1015e350573bb27a45a0588a8674a5ca8320d",
                "sha256:5f70bf18a086007016e948b04aed3b82103a36bea41755b6cddfaf10ace3c6ef"
            ]
        },
        "Metadata": {
            "LastTagTime": "2026-02-17T14:12:23.764308135Z"
        },
        "Descriptor": {
            "mediaType": "application/vnd.oci.image.index.v1+json",
            "digest": "sha256:3c6ed4b8c6bdc86bb131c802ddc35f6311cb91df7f8412f50b8f159c4c19fab0",
            "size": 1609
        },
        "Identity": {
            "Pull": [
                {
                    "Repository": "docker.io/kenchan0130/simplesamlphp"
                }
            ]
        }
    }
]

$ docker run -p 8080:8080 kenchan0130/simplesamlphp:latest
exec /usr/local/bin/docker-php-entrypoint: exec format error