2016-06-02 11:05:42 +05:30
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# Restoring from backup after a failed upgrade
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Upgrades are usually smooth and restoring from backup is a rare occurrence.
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However, it's important to know how to recover when problems do arise.
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## Roll back to an earlier version and restore a backup
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In some cases after a failed upgrade, the fastest solution is to roll back to
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the previous version you were using.
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First, roll back the code or package. For source installations this involves
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checking out the older version (branch or tag). For Omnibus installations this
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means installing the older .deb or .rpm package. Then, restore from a backup.
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Follow the instructions in the
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2019-07-07 11:18:12 +05:30
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[Backup and Restore](../raketasks/backup_restore.md#restore)
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2016-06-02 11:05:42 +05:30
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documentation.
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## Potential problems on the next upgrade
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When a rollback is necessary it can produce problems on subsequent upgrade
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attempts. This is because some tables may have been added during the failed
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upgrade. If these tables are still present after you restore from the
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older backup it can lead to migration failures on future upgrades.
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Starting in GitLab 8.6 we drop all tables prior to importing the backup to
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prevent this problem. If you've restored a backup to a version prior to 8.6 you
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may need to manually correct the problem next time you upgrade.
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Example error:
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```
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== 20151103134857 CreateLfsObjects: migrating =================================
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-- create_table(:lfs_objects)
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rake aborted!
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StandardError: An error has occurred, this and all later migrations canceled:
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PG::DuplicateTable: ERROR: relation "lfs_objects" already exists
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```
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Copy the version from the error. In this case the version number is
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`20151103134857`.
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>**WARNING:** Use the following steps only if you are certain this is what you
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need to do.
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### GitLab 8.6+
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Pass the version to a database rake task to manually mark the migration as
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complete.
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```
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# Source install
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sudo -u git -H bundle exec rake gitlab:db:mark_migration_complete[20151103134857] RAILS_ENV=production
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# Omnibus install
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sudo gitlab-rake gitlab:db:mark_migration_complete[20151103134857]
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```
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Once the migration is successfully marked, run the rake `db:migrate` task again.
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You will likely have to repeat this process several times until all failed
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migrations are marked complete.
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### GitLab < 8.6
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```
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# Source install
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sudo -u git -H bundle exec rails console production
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# Omnibus install
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sudo gitlab-rails console
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```
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At the Rails console, type the following commands:
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```
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ActiveRecord::Base.connection.execute("INSERT INTO schema_migrations (version) VALUES('20151103134857')")
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exit
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```
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Once the migration is successfully marked, run the rake `db:migrate` task again.
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You will likely have to repeat this process several times until all failed
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migrations are marked complete.
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