I am planning to migrate from one JIRA/Confluence server to a more powerful host, but want to leave the old JIRA/Confluence server online and available to our user base in "read-only" mode so that users can check the old servers for their own peace of mind, that the new server truly has all their data and that everything is working as expected, without them being able to make changes to the old servers?
Also, it's not going to come out for at least another month or so, but Confluence 6.8 will support read-only mode: https://community.developer.atlassian.com/t/confluence-6-8-eap-released-editor-upgrade-and-read-only-mode/14418
There is no explicit "read only", but you can do it manually.
For Jira, create a permission scheme that only allows "browse" permission. Apply it to all projects.
For Confluence, work through each space, removing all the permissions to do anything other than read
All well and good if projects share the same permission schemes, but where some prohibit browse access to most groups this isn't a one size fits all solution. Ironically, despite Atlassian saying this won't be considered, Jira and Confluence are made read only the second the DC licenses expire. the logic is there!
You can grab a license here that lasts for 3 hours (look for the license that says "3 hour expiration for all Atlassian host products*"):
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