an instance of an image, which is then called a container

https://www.tutorialspoint.com/docker/docker_images.htm 

an instance of an image, which is then called a container

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Check to be sure that port 22 is enabled before you reload

 https://superuser.com/questions/590600/ufw-is-active-but-not-enabled-why etting  ENABLED=yes  in  /etc/ufw/ufw.conf  did it for me. $ sudo ...