From which 4.x version are you performing the upgrade? Please note that OneDev only supports migration between official releases.

@robin from 4.7.0

Even after reverting to 4.7.0, it fails.

Please run below command to get a terminal for OneDev server:

kubectl exec -it -n onedev <onedev-pod-name> bash

Then run below command to post the output here:

ls /opt/onedev/lib/io.onedev.server*.jar

kubectl exec -it onedev-76857fc969-fb4zk -- bash
root@onedev-76857fc969-fb4zk:/# ls /opt/onedev/lib/io.onedev.server*.jar
/opt/onedev/lib/io.onedev.server-core-4.7.0.jar                       
/opt/onedev/lib/io.onedev.server-plugin-executor-docker-4.7.0.jar      
/opt/onedev/lib/io.onedev.server-plugin-report-clover-4.7.0.jar
/opt/onedev/lib/io.onedev.server-plugin-authenticator-ldap-4.7.0.jar  
/opt/onedev/lib/io.onedev.server-plugin-executor-kubernetes-4.7.0.jar  
/opt/onedev/lib/io.onedev.server-plugin-report-jest-4.7.0.jar
/opt/onedev/lib/io.onedev.server-plugin-buildspec-gradle-4.7.0.jar    
/opt/onedev/lib/io.onedev.server-plugin-import-github-4.7.0.jar        
/opt/onedev/lib/io.onedev.server-plugin-report-markdown-4.7.0.jar
/opt/onedev/lib/io.onedev.server-plugin-buildspec-maven-4.7.0.jar     
/opt/onedev/lib/io.onedev.server-plugin-import-youtrack-4.7.0.jar      
/opt/onedev/lib/io.onedev.server-plugin-sso-openid-4.7.0.jar
/opt/onedev/lib/io.onedev.server-plugin-buildspec-node-4.7.0.jar      
/opt/onedev/lib/io.onedev.server-plugin-report-checkstyle-4.7.0.jar    
/opt/onedev/lib/io.onedev.server-product-4.7.0.jar

Please do the following:

1. Open a local terminal and change to maintenance folder of OnDev's k8s-resources directory
2. Run command kubectl apply -k .
3. Login to OneDev terminal by running kubectl exec command above
4. Post output by running `ls /app/lib/io.onedev.server*.jar
5. Run command /opt/onedev/bin/server.sh console to see if OneDev can be started. If not, please post console logout

kubectl exec -it  onedev-59cfbbc7dc-dhcqk -- bash
root@onedev-59cfbbc7dc-dhcqk:/# ls /app/lib/io.onedev.server*.jar
/app/lib/io.onedev.server-core-4.7.0.jar                       /app/lib/io.onedev.server-plugin-executor-docker-4.7.0.jar      /app/lib/io.onedev.server-plugin-report-clover-4.7.0.jar
/app/lib/io.onedev.server-plugin-authenticator-ldap-4.7.0.jar  /app/lib/io.onedev.server-plugin-executor-kubernetes-4.7.0.jar  /app/lib/io.onedev.server-plugin-report-jest-4.7.0.jar
/app/lib/io.onedev.server-plugin-buildspec-gradle-4.7.0.jar    /app/lib/io.onedev.server-plugin-import-github-4.7.0.jar        /app/lib/io.onedev.server-plugin-report-markdown-4.7.0.jar
/app/lib/io.onedev.server-plugin-buildspec-maven-4.7.0.jar     /app/lib/io.onedev.server-plugin-import-youtrack-4.7.0.jar      /app/lib/io.onedev.server-plugin-sso-openid-4.7.0.jar
/app/lib/io.onedev.server-plugin-buildspec-node-4.7.0.jar      /app/lib/io.onedev.server-plugin-report-checkstyle-4.7.0.jar    /app/lib/io.onedev.server-product-4.7.0.jar
root@onedev-59cfbbc7dc-dhcqk:/# /opt/onedev/bin/server.sh console
Running OneDev...
--> Wrapper Started as Console
Java Service Wrapper Standard Edition 64-bit 3.5.44
  Copyright (C) 1999-2020 Tanuki Software, Ltd. All Rights Reserved.
    http://wrapper.tanukisoftware.com
  Licensed to OneDev for Service Wrapping

Launching a JVM...
WrapperManager: Initializing...
05:09:34 INFO  i.o.c.launcher.bootstrap.Bootstrap - Launching application from '/opt/onedev'...
05:09:34 INFO  i.o.c.launcher.bootstrap.Bootstrap - Cleaning temp directory...
05:09:34 INFO  i.o.c.launcher.loader.AppLoader - Initializing dependency injection container...
05:09:36 INFO  i.o.c.launcher.loader.AppLoader - Starting plugin manager...
05:09:40 ERROR i.o.s.p.DefaultPersistManager - Data version mismatch (app data version: 58, db data version: 57)
<-- Wrapper Stopped

Version 4.7.0 has a bug upgrading to new versions. To fix this, please copy this file into /opt/onedev/lib to override existing file. Then OneDev should be able to start by running /opt/onedev/bin/server.sh console

If it starts fine, stop the server, and exit the terminal. From your local terminal, change to directory <OneDev k8s dir>/production, edit kustomization.yaml to change version to 5.3.0, and apply the change to upgrade to 5.3.0

@robin - thanks, that worked :) it looks like I've lost some projects though?

All projects should be migrated. Make sure you are login as admin to check if projects are there.

I can confirm some projects have been lost and that the oldest activity listed in the projects was around 4 months ago, the last time I upgraded the server. I’ve noticed that some files appear to be more recent which is good news

I’ve a copy of the repos anyway so I can push them up.

The buggy 4.7.0 release prevents projects from writing to database, and it explains why modifications after that are not persistent. Also make sure to schedule auto daily-backup for database.

Ah gotcha - thanks!