- there is Docker CE (Community Edition) for free versions of the Open Source code. There is Docker EE (Enterprise Edition) for their commercially sold engine.
- the releases are vYY.MM, where YY designates the year (e.g. 17), and MM stands for the release month. So v17.03 means March 2017.
- Docker EE is planned to be released every 3 months (v17.03, v17.06, v17.09, etc).
- Docker CE has got two streams: an "edge" version is released every month (v17.03, v17.04, v17.05, etc.). Each version will be superseded by the next month's release. The "stable" version is published every 3 months (v17.03, v17.06, etc) and will be maintained for four months, i.e. give users a one month overlap to upgrade.