Docker's official package installs dockerd at /usr/bin/dockerd; the
Debian docker.io package put it at /usr/sbin/dockerd. After the apt
swap, the new docker.service unit file is on disk with the right
path, but systemd's cached unit still has the OLD ExecStart pointing
at /usr/sbin/dockerd. Daemon start fails with:
status=203/EXEC "No such file or directory"
Fix is systemctl daemon-reload between install and start. nh3-docker
hit this; adding the step so esh-docker-vm and ana-docker don't.
vh
23222418fa