Docker Swarm Debug

gistfile1.txt

FROM https://stackoverflow.com/questions/45372848/docker-swarm-how-to-find-out-why-service-cant-start

journalctl -u docker.service | tail -n 50 
It depends on your OS. Here are the few locations, with commands for few Operating Systems:

Ubuntu (old using upstart ) - /var/log/upstart/docker.log
Ubuntu (new using systemd ) - journalctl -u docker.service
Boot2Docker - /var/log/docker.log
Debian GNU/Linux - /var/log/daemon.log
CentOS - /var/log/daemon.log | grep docker
CoreOS - journalctl -u docker.service
Fedora - journalctl -u docker.service
Red Hat Enterprise Linux Server - /var/log/messages | grep docker
OpenSuSE - journalctl -u docker.service
OSX - ~/Library/Containers/com.docker.docker/Data/com.docker.driver.amd64-linux/log/d‌​ocker.log
Windows - Get-EventLog -LogName Application -Source Docker -After (Get-Date).AddMinutes(-5) | Sort-Object Time, as mentioned here.