Hard to understand error message during exec #378
Description
Describe the bug
Fatal error running backup: withLabeledCommands: archive: error running pre commands: runLabeledCommands: error from errgroup: runLabeledCommands: error executing command: exec: error demultiplexing output: Unrecognized input header: 60
To Reproduce
Steps to reproduce the behavior:
volumes:
postgresql_db:
services:
postgres:
image: postgres:12.16-alpine3.18
volumes:
- type: volume
source: postgresql_db
target: /var/lib/postgresql/data
environment:
POSTGRES_PASSWORD: something
POSTGRES_USER: postgres
POSTGRES_DB: postgres
labels:
docker-volume-backup.exec-label: database
docker-volume-backup.archive-pre: /bin/sh -c 'pg_dumpall -U postgres > /var/lib/postgresql/data/backup.sql'
docker-volume-backup.archive-post: /bin/sh -c 'rm /var/lib/postgresql/data/backup.sql'
minio_backup:
image: offen/docker-volume-backup:v2.36.1
environment:
EXEC_LABEL: database
DOCKER_HOST: tcp://docker_socket_proxy:2375
volumes:
- type: volume
source: postgresql_db
target: /backup
read_only: true
docker_socket_proxy:
image: tecnativa/docker-socket-proxy:0.1
volumes:
- type: bind
source: /var/run/docker.sock
target: /var/run/docker.sock
read_only: true
environment:
CONTAINERS: 1
SERVICES: 1
INFO: 1
POST: 1
TASKS: 1
NODES: 1
# EXEC: 1Expected behavior
Clear error message that EXEC permission is missing.
Version (please complete the following information):
- Image Version: v2.36.1
- Docker Version: 25.0.1
Additional context
This is mostly just to help out other people if they run into the given error above. With the missing EXEC permission, the socket proxy returns <html><body><h1>403 Forbidden</h1>\nRequest forbidden by administrative rules.\n</body></html> and to no surprise < has the ASCII value of 60, see in the error above.