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Add an explanation of volumes and state.

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Will Sargent 2014-09-09 18:23:02 -07:00
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@ -258,6 +258,8 @@ Volumes are useful in situations where you can't use links (which are TCP/IP onl
You can mount them in several docker containers at once, using `docker run -volume-from`
Because volumes are isolated filesystems, they are often used to store state from computations between transient containers. That is, you can have a stateless and transient container run from a recipe, blow it away, and then have a second instance of the transient container pick up from where the last one left off.
See [advanced volumes](http://crosbymichael.com/advanced-docker-volumes.html) for more details.
## Exposing ports