gitlab-org--gitlab-foss/doc/administration/repository_checks.md

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# Repository checks
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> [Introduced][ce-3232] in GitLab 8.7. It is OFF by default because it still
causes too many false alarms.
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Git has a built-in mechanism, [git fsck][git-fsck], to verify the
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integrity of all data committed to a repository. GitLab administrators
can trigger such a check for a project via the project page under the
admin panel. The checks run asynchronously so it may take a few minutes
before the check result is visible on the project admin page. If the
checks failed you can see their output on the admin log page under
'repocheck.log'.
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## Periodic checks
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When enabled, GitLab periodically runs a repository check on all project
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repositories and wiki repositories in order to detect data corruption.
A project will be checked no more than once per month. If any projects
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fail their repository checks all GitLab administrators will receive an email
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notification of the situation. This notification is sent out once a week,
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by default, midnight at the start of Sunday. Repositories with known check
failures can be found at `/admin/projects?last_repository_check_failed=1`.
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## Disabling periodic checks
You can disable the periodic checks on the 'Settings' page of the admin
panel.
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## What to do if a check failed
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If the repository check fails for some repository you should look up the error
in `repocheck.log`:
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- in the [admin panel](logs.md#repochecklog)
- or on disk, see:
- `/var/log/gitlab/gitlab-rails` for Omnibus installations
- `/home/git/gitlab/log` for installations from source
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If for some reason the periodic repository check caused a lot of false
alarms you can choose to clear *all* repository check states by
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clicking "Clear all repository checks" on the **Settings** page of the
admin panel (`/admin/application_settings`).
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---
[ce-3232]: https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/3232 "Auto git fsck"
[git-fsck]: https://git-scm.com/docs/git-fsck "git fsck documentation"