Getting this error on Ubuntu 20.04.

I had origianlly installed the default version 3.0.6 on ubuntu.

I have purged it and installed 5.0.9. But now I get this error in logs and mongod won't start.

"Failed to start up WiredTiger under any compatibility version. This may be due to an unsupported upgrade or downgrade."

CodePudding user response：

It's a massive gap between versions. You need to upgrade all versions in-between one at a time: https://www.mongodb.com/docs/manual/release-notes/5.0-upgrade-standalone/#upgrade-version-path:

To upgrade an existing MongoDB deployment to 5.0, you must be running a 4.4-series release.

To upgrade from a version earlier than the 4.4-series, you must successively upgrade major releases until you have upgraded to 4.4-series. For example, if you are running a 4.2-series, you must upgrade first to 4.4 before you can upgrade to 5.0.

Or you can export data from 3.0.6 , start 5.0.9 with empty data directory (Storage.dbPath option in config), import data to 5.0.9