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Merge pull request #474 from davidcurrie/master 

Document .classCache sharing for websphere-liberty
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Tianon Gravi 2016-01-29 10:30:22 -08:00
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@ -85,3 +85,27 @@ The images are designed to support a number of different usage patterns. The fol
$ docker run -d -p 80:9080 \ $ docker run -d -p 80:9080 \
--volumes-from app websphere-liberty:webProfile6 --volumes-from app websphere-liberty:webProfile6
``` ```
# Using IBM JRE Class data sharing
The IBM JRE provides a feature [Class data sharing](http://www-01.ibm.com/support/knowledgecenter/SSYKE2_8.0.0/com.ibm.java.lnx.80.doc/diag/understanding/shared_classes.html) which offers transparent and dynamic sharing of data between multiple Java Virtual Machines running on the same host using shared memory backed by a file. When running the Liberty Docker image, it looks for the file at `/opt/ibm/wlp/output/.classCache`. To benefit from Class data sharing, this location needs to be shared between containers either via the host or a data volume container.
Taking the application image from example 3 above, containers can share the host file location (containing the shared cache) `/tmp/websphere-liberty/classCache` as follows:
```console
docker run -d -p 80:9080 -p 443:9443 \
-v /tmp/websphere-liberty/classCache:/opt/ibm/wlp/output/.classCache app
```
Alternatively, create a named data volume container that exposes a volume at the location of the shared file:
```console
docker run -e LICENSE=accept -v /opt/ibm/wlp/output/.classCache \
--name classcache websphere-liberty true
```
Then run the WebSphere Liberty image with the volumes from the data volume container classcache mounted as follows:
```console
docker run -d -p 80:9080 -p 443:9443 --volumes-from classcache app
```