1 files changed, 97 insertions, 0 deletions
diff --git a/doc/administration/raketasks/check.md b/doc/administration/raketasks/check.md
new file mode 100644
index 00000000000..d1d2fed4861
--- /dev/null
+++ b/doc/administration/raketasks/check.md
@@ -0,0 +1,97 @@
+# Check Rake Tasks
+
+## Repository Integrity
+
+Even though Git is very resilient and tries to prevent data integrity issues,
+there are times when things go wrong. The following Rake tasks intend to
+help GitLab administrators diagnose problem repositories so they can be fixed.
+
+There are 3 things that are checked to determine integrity.
+
+1. Git repository file system check ([git fsck](https://git-scm.com/docs/git-fsck)).
+   This step verifies the connectivity and validity of objects in the repository.
+1. Check for `config.lock` in the repository directory.
+1. Check for any branch/references lock files in `refs/heads`.
+
+It's important to note that the existence of `config.lock` or reference locks
+alone do not necessarily indicate a problem. Lock files are routinely created
+and removed as Git and GitLab perform operations on the repository. They serve
+to prevent data integrity issues. However, if a Git operation is interrupted these
+locks may not be cleaned up properly.
+
+The following symptoms may indicate a problem with repository integrity. If users
+experience these symptoms you may use the rake tasks described below to determine
+exactly which repositories are causing the trouble.
+
+- Receiving an error when trying to push code - `remote: error: cannot lock ref`
+- A 500 error when viewing the GitLab dashboard or when accessing a specific project.
+
+### Check all GitLab repositories
+
+This task loops through all repositories on the GitLab server and runs the
+3 integrity checks described previously.
+
+**Omnibus Installation**
+
+```
+sudo gitlab-rake gitlab:repo:check
+```
+
+**Source Installation**
+
+```bash
+sudo -u git -H bundle exec rake gitlab:repo:check RAILS_ENV=production
+```
+
+### Check repositories for a specific user
+
+This task checks all repositories that a specific user has access to. This is important
+because sometimes you know which user is experiencing trouble but you don't know
+which project might be the cause.
+
+If the rake task is executed without brackets at the end, you will be prompted
+to enter a username.
+
+**Omnibus Installation**
+
+```bash
+sudo gitlab-rake gitlab:user:check_repos
+sudo gitlab-rake gitlab:user:check_repos[<username>]
+```
+
+**Source Installation**
+
+```bash
+sudo -u git -H bundle exec rake gitlab:user:check_repos RAILS_ENV=production
+sudo -u git -H bundle exec rake gitlab:user:check_repos[<username>] RAILS_ENV=production
+```
+
+Example output:
+
+![gitlab:user:check_repos output](../img/raketasks/check_repos_output.png)
+
+## LDAP Check
+
+The LDAP check Rake task will test the bind_dn and password credentials
+(if configured) and will list a sample of LDAP users. This task is also
+executed as part of the `gitlab:check` task, but can run independently
+using the command below.
+
+**Omnibus Installation**
+
+```
+sudo gitlab-rake gitlab:ldap:check
+```
+
+**Source Installation**
+
+```bash
+sudo -u git -H bundle exec rake gitlab:ldap:check RAILS_ENV=production
+```
+
+By default, the task will return a sample of 100 LDAP users. Change this
+limit by passing a number to the check task:
+
+```bash
+rake gitlab:ldap:check[50]
+```