Untested.
Upgrading an openVZ container <should> work but typical recommendations like making proven/tested backup and/or roll back capability would be more important than usual.
Recommend upgrading to 42.1 since that is a recommended upgraded path, and then you can make a decision about 42.2 after that.
Thanks, is there a supported rollback function in zypper or do I need to look elsewhere?
Is there an easy way to backup the entire container? That might be easier than a rollback. I already backup what is necessary like database entries, etc but it is a pain in the neck to start over from scratch.
I don’t ordinarily use OpenVZ, but a Google search reveals that OpenVZ released a backup and restore app called vzdump that hasn’t been updated since 2009 (kidding, It’s very simple so in this case old is not necessarily bad).