Raspberry Pi: App build error

[ardenor]

Hi there!

When docker-compose up runs, the app and db seem to exit.

When attempting to docker-compose up the app alone, it gives the error: /app: line 1: syntax error: unexpected "("

Thanks :)

[marcusolsson]

Thanks for letting us know!

I'm unable to reproduce this. Could you please share the OS you're running, and the Docker version you're using?

[bose2]

Hello,

Is Docker on Raspberry Pi 4 with Ubuntu OS supported for the tutorial environment?

Have the following error "standard_init_linux.go:219: exec user process caused: exec format error" on container "tutorial-environment_db_1"

And Permissions error "/bin/sh: /app: Permission denied" on "tutorial-environment_app_1"

Thanks,
Ed

[LoLo2207]

Hi there!

When docker-compose up runs, the app and db seem to exit.

When attempting to docker-compose up the app alone, it gives the error: /app: line 1: syntax error: unexpected "("

Thanks :)

Same here, also on a Raspberry Pi 4, but with Raspbian 10 (buster)

pi@raspi:~/source/repos/tutorial-environment $ docker --version
Docker version 20.10.5, build 55c4c88
pi@raspi:~/source/repos/tutorial-environment $ docker info
Client:
 Context:    default
 Debug Mode: false
 Plugins:
  app: Docker App (Docker Inc., v0.9.1-beta3)
  buildx: Build with BuildKit (Docker Inc., v0.5.1-docker)

Server:
 Containers: 6
  Running: 5
  Paused: 0
  Stopped: 1
 Images: 11
 Server Version: 20.10.5
 Storage Driver: overlay2
  Backing Filesystem: extfs
  Supports d_type: true
  Native Overlay Diff: true
 Logging Driver: json-file
 Cgroup Driver: cgroupfs
 Cgroup Version: 1
 Plugins:
  Volume: local
  Network: bridge host ipvlan macvlan null overlay
  Log: awslogs fluentd gcplogs gelf journald json-file local logentries splunk syslog
 Swarm: inactive
 Runtimes: io.containerd.runc.v2 io.containerd.runtime.v1.linux runc
 Default Runtime: runc
 Init Binary: docker-init
 containerd version: 05f951a3781f4f2c1911b05e61c160e9c30eaa8e
 runc version: 12644e614e25b05da6fd08a38ffa0cfe1903fdec
 init version: de40ad0
 Security Options:
  seccomp
   Profile: default
 Kernel Version: 5.10.17-v7l+
 Operating System: Raspbian GNU/Linux 10 (buster)
 OSType: linux
 Architecture: armv7l
 CPUs: 4
 Total Memory: 3.737GiB
 Name: raspi
 ID: 4TAW:VU6V:DXE3:352M:CYLF:CQK3:KL4S:LQG2:THXN:FYC2:BBTA:RC7H
 Docker Root Dir: /var/lib/docker
 Debug Mode: false
 Registry: https://index.docker.io/v1/
 Labels:
 Experimental: false
 Insecure Registries:
  127.0.0.0/8
 Live Restore Enabled: false

WARNING: No memory limit support
WARNING: No swap limit support
WARNING: No kernel memory TCP limit support
WARNING: No oom kill disable support

@marcusolsson
Can we get the source code of that binary and compile it manually? Or a new version.

Thanks

[maonat]

I was able to reproduce on my raspberry PI 4B 4GB with ubuntu_server_21 installed.
Installation clean after update/upgrade did cause same issue.

Perhaps same issue can be reproduced with ubuntu server Docker image running inside the tutorial.
@marcusolsson

On my macOS 11.4 worked like a charm.

[bitsy]

I'm also experiencing a similar issue. I'm running Docker 20.10.21 on a Raspberry Pi 3B+ running Pi OS Bullseye. I also use Portainer to manage Docker. Here's the log output I get from Portainer when the app container exits:
/app: line 1: syntax error: unexpected "("
The db container produces this error:
exec /db: exec format error

Any thoughts?

[markr111]

got this working on raspberry pi: changes in https://github.com/markr111/tutorial-environment/tree/ARM_DEMO

(not submitting as PR to grafana because it will break non-ARM architectures)

/app was compiled and bundled in the app repo as an AMD64 binary.
Fixed by modifying the ./app Dockerfile to compile main.go instead of copying incompatible executable into docker image. Not perfect, could create a multistage docker build.

Also - the db container was exiting on rpi for the same reason (incompatible arch), docker hub has a pi-specific tns-db image which docker-compose.yml now points at (this will break tns-db on other architectures)

caveat: I haven't run the entire demo against this branch so things might still be broken - but no more errors on startup.

[andriandreo]

/app was compiled and bundled in the app repo as an AMD64 binary.
Fixed by modifying the ./app Dockerfile to compile main.go instead of copying incompatible executable into docker image. Not perfect, could create a multistage docker build.

Thanks for the contribution! I'm afraid I still can't get it to work properly: same app-1 | /app: line 1: syntax error: unexpected "(" exit error from docker compose logs app

[markr111]

@andriandreo - /app shouldn't exist (it's at /src/app)

have you switched to the ARM_DEMO branch?

[andriandreo]

@markr111

have you switched to the ARM_DEMO branch?

Yes, of course, but something is wrong with the app file, that error persists

[markr111]

try docker compose build - this should rebuild the app directory and create a new image with the fix
then docker compose up -d
you might still be launching the broken app image