Assume I've downloaded the official mysql:5.6.21 image.
I created many Docker containers to deploy this image.
These containers have been operating for a while, awaiting the release of MySQL 5.6.22. My containers are still running 5.6.21, despite the fact that the official image of mysql:5.6 has been updated to reflect the latest release.
How can I update all of my existing containers with the changes in the image (i.e. upgrade MySQL distro)? What is the right Docker method for accomplishing this?