Confluence 6.10 Upgrade Notes
Here are some important notes on upgrading to Confluence 6.10. For details of the new features and improvements in this release, see the Confluence 6.10 Release Notes.
Confluence 6 is a major upgrade
If you're upgrading from Confluence 5.x, be sure to read these upgrade notes thoroughly, take a full backup, and test your upgrade in a non-production environment before upgrading your production site.
Tomcat 9 upgrade
In this release we've upgraded Apache Tomcat from version 8 to 9. Some things you should be aware of:
- Tomcat 9 supports HTTP/2, but Confluence does not yet support this protocol.
- Tomcat 9 introduces support for multiple TLS virtual hosts for a single connector with each virtual host supporting multiple certificates. We haven't tested this with Confluence yet, and have made no changes to the sample connectors in Confluence's
server.xmlfile. We may introduce some changes in future releases.
As usual, we recommend upgrading your test or staging site before upgrading your production site to Confluence 6.10, particularly if you've made significant changes to your
server.xml. It's also good practice to re-apply modifications, rather than just copying over your old
If you're running Confluence as a service, you may need to:
- reinstall the service, if you've upgraded Confluence manually
- reapply any system properties or JVM flags you may be passing via the service.
In this release we fixed a number of issues relating to search. Some of the fixes will only apply to newly created or edited content, until you next reindex your site.
Additional memory requirements for Data Center
As mentioned in the release notes, you should make sure that each Confluence node in the cluster has at least 2GB free memory to cater for the sandboxes.
Supported platforms changes
In this release we've:
- Added support for Microsoft SQL Server 2016
Update configuration files after upgrading
The contents of configuration files such as
server.xml, web.xml ,
confluenceinit.properties change from time to time.
When upgrading, we recommend manually reapplying any additions to these files (such as proxy configuration, datasource, JVM parameters) rather than simply overwriting the file with the file from your previous installation, otherwise you will miss out on any improvements we have made.
Upgrading from Confluence 5.x?
Collaborative editing is made possible by the magic of Synchrony. When you install Confluence Server, Synchrony will be configured to run as a separate process on your server.
If you're upgrading from Confluence 5.x, there are a few requirements you need to be aware of:
- Memory and CPU: You may need to give your server more resources than for previous Confluence releases. When you install Confluence, Synchrony (which is required for collaborative editing), will be configured to run as a separate process on your server. The default maximum heap size for Synchrony is 1 GB (on top of Confluence's requirements).
- WebSockets: Collaborative editing works best with WebSockets. Your firewall / proxy should allow WebSocket connections.
- SSL termination: SSL should be terminated at your load balancer, proxy server, or gateway as Synchrony does not support direct HTTPS connections.
- Database drivers: You must use a supported database driver. Collaborative editing will fail with an error if you're using an unsupported or custom JDBC driver (or
driverClassNamein the case of a JNDI datasource connection). See Database JDBC Drivers for the list of drivers we support.
- Database connection pool: your database must allow enough connections to support both Confluence and Synchrony (which defaults to a maximum pool size of 15).
Head to Preparing for Confluence 6.10 to find out more about changes under the hood.
End of support announcements
- There is a known issue where read-only mode attempts to write to
<shared-home>/confluence.cfg.xml, but the file doesn't exist in the shared home directory. This problem affects sites that have been previously upgraded from Confluence 6.0 or earlier. See Could not save access.mode into the shared confluence.cfg.xml file error after upgrading to Confluence Data Center 6.10
- There is a known issue where some fonts that Confluence relies on are not available in older Linux distributions. See Confluence UI shows garbled or corrupt text on CAPTCHA, macros and/or diagrams due to missing fonts.
- There is a known issue where the "hibernate dialect" property was being incorrectly retained after upgrade. Customers who have been using Confluence since version 2.4 or earlier (legends!) should check the hibernate dialect in their
<confluence-home>/confluence.cfg.xmlfile before upgrading to Confluence 6.x to avoid this error: Upgrading fails with ERROR The size (16777215) given to the column 'event' exceeds the maximum allowed for any data type (8000) in Confluence.
- There is a known issue when upgrading Confluence with an Oracle database. Oracle users should upgrade their driver to 12.2.0.x before upgrading to Confluence 6.1 or later. See Upgrade to version 6.1.x Failed With Error "ORA-01000: maximum open cursors exceeded" for more information.
Note: Upgrade to a test environment first. Test your upgrades in your test environment before rolling them into production.
If you're already running a version of Confluence, please follow these instructions to upgrade to the latest version:
- Go to > Support Tools > Health Check to check your license validity, application server, database setup and more.
- Before you upgrade, we strongly recommend that you back up your installation directory, home directory and database.
- If your version of Confluence is earlier than 6.5, read the for all releases between your version and the latest version.
- Download the latest version of Confluence.
- Follow the instructions in the Upgrade Guide.
Checking for known issues and troubleshooting the Confluence upgrade
After you have completed the steps required to upgrade your Confluence installation, check all the items on the Confluence post-upgrade checklist to ensure that everything works as expected. If something is not working correctly, please check for known Confluence issues and try troubleshooting your upgrade as described below:
- Check for known issues. Sometimes we find out about a problem with the latest version of Confluence after we have released the software. In such cases we publish information about the known issues in the Confluence Knowledge Base.
- Check for answers from the community. Other users may have encountered the same issue. You can check for answers from the community at Atlassian Answers.
- Did you encounter a problem during the Confluence upgrade? Please refer to the guide to troubleshooting upgrades in the Confluence Knowledge Base.
If you encounter a problem during the upgrade and can't solve it, please create a support ticket and one of our support engineers will help you.