Why docker-compose.yml: Permission denied Happened

Shell redirection (> / <<EOF) occurs before sudo, so the target file is opened by your unprivileged shell.

Correct Patterns

Use sudo tee:

sudo tee docker-compose.yml >/dev/null <<'YAML'
services:
  app:
    image: example
YAML

Or create the file as root-owned directory you control, then adjust ownership:

sudo install -d -o $USER -g $USER /srv/apps/nocodb