Fix "command not found: docker"

Fix "command not found: docker"

Symptom: A Docker call reports "command not found" even though Container Manager is running.

Cause: DSM installs Docker at /usr/local/bin/docker, which is not on the PATH of non-interactive SSH sessions (/etc/profile is not sourced).

Solution: You don't have to do anything — Synology Manager Plus deliberately always invokes Docker via the absolute path. If the error still occurs, check that Container Manager is installed and that passwordless sudo for /usr/local/bin/docker is set up.