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Merge pull request #983 from vmassol/patch-3 

Added explanations on how to upgrade XWiki + added info on additional…
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@ -206,6 +206,20 @@ Note that if you want to set a custom version of XWiki you can edit the `.env` f
Note that `docker-compose up` will automatically build the XWiki image on the first run. If you need to rebuild it you can issue `docker-compose up --build`. You can also build the image with `docker build . -t xwiki-mysql-tomcat:latest` for example. Note that `docker-compose up` will automatically build the XWiki image on the first run. If you need to rebuild it you can issue `docker-compose up --build`. You can also build the image with `docker build . -t xwiki-mysql-tomcat:latest` for example.
# Upgrading XWiki
You've installed an XWiki docker image and used it and now comes the time when you'd like to upgrade XWiki to a newer version.
If you've followed the instructions above you've mapped the XWiki permanent directory to a local directory on your host.
Thus all you need to do is to execute the installation instructions above as if you were installing a new version of the XWiki docker image.
Then you need to stop your running XWiki container. You should keep your DB container running. Then all you have to do is start a new container as described above, using the new XWiki docker image.
Caveats:
- Right now we have an [outstanding issue](https://jira.xwiki.org/browse/XDOCKER-20) and thus if you've had to modify `xwiki.properties` or `xwiki.cfg` inside the XWiki container, you'll need to port your changes inside the new container (see the section below).
# Details for the xwiki image # Details for the xwiki image
## Configuration Options ## Configuration Options
@ -217,6 +231,14 @@ The first time you create a container out of the xwiki image, a shell script (`/
- `DB_DATABASE`: The name of the XWiki database to use/create. - `DB_DATABASE`: The name of the XWiki database to use/create.
- `DB_HOST`: The name of the host (or docker container) containing the database. Default is "db". - `DB_HOST`: The name of the host (or docker container) containing the database. Default is "db".
If you need to configure XWiki (e.g. modify `xwiki.properties` or `xwiki.cfg`) or perform some additional configuration, you can execute another container and attach to the running XWiki container by issuing:
```console
docker exec -it <xwiki container id> bash -l
```
Note that we plan to [lift this limitation in the future](https://jira.xwiki.org/browse/XDOCKER-20).
## Passing JVM options ## Passing JVM options
It's possible to pass JVM options to Tomcat by defining the `JAVA_OPTS` environment property. It's possible to pass JVM options to Tomcat by defining the `JAVA_OPTS` environment property.