Docker daemon logs

When encountering a problem, one of the first steps for many is to check the Docker daemon logs. The accessibility of Docker logs varies depending on your operating system:

Operating System	Log File Location or Command
macOS	`~/Library/Containers/com.docker.docker/Data/log/vm/dockerd.log`
Debian	`/var/log/daemon.log`
CentOS	`grep docker /var/log/messages`
CoreOS	`journalctl -u docker.service`
Ubuntu (Upstart)	`/var/log/upstart/docker.log`
Ubuntu (systemd)	`journalctl -u docker.service`

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