Troubleshooting Geo (PREMIUM SELF)

Setting up Geo requires careful attention to details and sometimes it's easy to miss a step.

Here is a list of steps you should take to attempt to fix problem:

Perform basic troubleshooting.
Fix any replication errors.
Fix any common errors.

Basic troubleshooting

Before attempting more advanced troubleshooting:

Check the health of the secondary node.
Check if PostgreSQL replication is working.

Check the health of the secondary node

On the primary node:

On the top bar, select Menu > {admin} Admin.
On the left sidebar, select Geo > Nodes.

We perform the following health checks on each secondary node to help identify if something is wrong:

Is the node running?
Is the node's secondary database configured for streaming replication?
Is the node's secondary tracking database configured?
Is the node's secondary tracking database connected?
Is the node's secondary tracking database up-to-date?

For information on how to resolve common errors reported from the UI, see Fixing Common Errors.

If the UI is not working, or you are unable to log in, you can run the Geo health check manually to get this information as well as a few more details.

Health check Rake task

This Rake task can be run on an app node in the primary or secondary Geo nodes:

sudo gitlab-rake gitlab:geo:check

Example output:

Checking Geo ...

GitLab Geo is available ... yes
GitLab Geo is enabled ... yes
This machine's Geo node name matches a database record ... yes, found a secondary node named "Shanghai"
GitLab Geo secondary database is correctly configured ... yes
Database replication enabled? ... yes
Database replication working? ... yes
GitLab Geo HTTP(S) connectivity ...
* Can connect to the primary node ... yes
HTTP/HTTPS repository cloning is enabled ... yes
Machine clock is synchronized ... yes
Git user has default SSH configuration? ... yes
OpenSSH configured to use AuthorizedKeysCommand ... yes
GitLab configured to disable writing to authorized_keys file ... yes
GitLab configured to store new projects in hashed storage? ... yes
All projects are in hashed storage? ... yes

Checking Geo ... Finished

Sync status Rake task

Current sync information can be found manually by running this Rake task on any secondary app node:

sudo gitlab-rake geo:status

Example output:

http://secondary.example.com/
-----------------------------------------------------
                        GitLab Version: 11.10.4-ee
                              Geo Role: Secondary
                         Health Status: Healthy
                          Repositories: 289/289 (100%)
                 Verified Repositories: 289/289 (100%)
                                 Wikis: 289/289 (100%)
                        Verified Wikis: 289/289 (100%)
                           LFS Objects: 8/8 (100%)
                           Attachments: 5/5 (100%)
                      CI job artifacts: 0/0 (0%)
                  Repositories Checked: 0/289 (0%)
                         Sync Settings: Full
              Database replication lag: 0 seconds
       Last event ID seen from primary: 10215 (about 2 minutes ago)
     Last event ID processed by cursor: 10215 (about 2 minutes ago)
                Last status report was: 2 minutes ago

Check if PostgreSQL replication is working

To check if PostgreSQL replication is working, check if:

Nodes are pointing to the correct database instance.
Geo can detect the current node correctly.

Are nodes pointing to the correct database instance?

You should make sure your primary Geo node points to the instance with writing permissions.

Any secondary nodes should point only to read-only instances.

Can Geo detect the current node correctly?

Geo finds the current machine's Geo node name in /etc/gitlab/gitlab.rb by:

Using the gitlab_rails['geo_node_name'] setting.
If that is not defined, using the external_url setting.

This name is used to look up the node with the same Name in the Geo Nodes dashboard.

To check if the current machine has a node name that matches a node in the database, run the check task:

sudo gitlab-rake gitlab:geo:check

It displays the current machine's node name and whether the matching database record is a primary or secondary node.

This machine's Geo node name matches a database record ... yes, found a secondary node named "Shanghai"

This machine's Geo node name matches a database record ... no
  Try fixing it:
  You could add or update a Geo node database record, setting the name to "https://example.com/".
  Or you could set this machine's Geo node name to match the name of an existing database record: "London", "Shanghai"
  For more information see:
  doc/administration/geo/replication/troubleshooting.md#can-geo-detect-the-current-node-correctly

Fixing errors found when running the Geo check Rake task

When running this Rake task, you may see errors if the nodes are not properly configured:

sudo gitlab-rake gitlab:geo:check

Rails did not provide a password when connecting to the database
```
Checking Geo ...

GitLab Geo is available ... Exception: fe_sendauth: no password supplied
GitLab Geo is enabled ... Exception: fe_sendauth: no password supplied
...
Checking Geo ... Finished
```
- Ensure that you have the gitlab_rails['db_password'] set to the plain text-password used when creating the hash for postgresql['sql_user_password'].

Rails is unable to connect to the database

Checking Geo ...

GitLab Geo is available ... Exception: FATAL:  no pg_hba.conf entry for host "1.1.1.1",  user "gitlab", database "gitlabhq_production", SSL on
FATAL:  no pg_hba.conf entry for host "1.1.1.1", user "gitlab", database "gitlabhq_production", SSL off
GitLab Geo is enabled ... Exception: FATAL:  no pg_hba.conf entry for host "1.1.1.1", user "gitlab", database "gitlabhq_production", SSL on
FATAL:  no pg_hba.conf entry for host "1.1.1.1", user "gitlab", database "gitlabhq_production", SSL off
...
Checking Geo ... Finished

Ensure that you have the IP address of the rails node included in postgresql['md5_auth_cidr_addresses'].
Ensure that you have included the subnet mask on the IP address: postgresql['md5_auth_cidr_addresses'] = ['1.1.1.1/32'].

Rails has supplied the incorrect password

Checking Geo ...
GitLab Geo is available ... Exception: FATAL:  password authentication failed for user "gitlab"
FATAL:  password authentication failed for user "gitlab"
GitLab Geo is enabled ... Exception: FATAL:  password authentication failed for user "gitlab"
FATAL:  password authentication failed for user "gitlab"
...
Checking Geo ... Finished

Verify the correct password is set for gitlab_rails['db_password'] that was used when creating the hash in postgresql['sql_user_password'] by running gitlab-ctl pg-password-md5 gitlab and entering the password.

Check returns not a secondary node
```
Checking Geo ...

GitLab Geo is available ... yes
GitLab Geo is enabled ... yes
GitLab Geo secondary database is correctly configured ... not a secondary node
Database replication enabled? ... not a secondary node
...
Checking Geo ... Finished
```
- Ensure that you have added the secondary node in the Admin Area of the primary node.
- Ensure that you entered the external_url or gitlab_rails['geo_node_name'] when adding the secondary node in the Admin Area of the primary node.
- Prior to GitLab 12.4, edit the secondary node in the Admin Area of the primary node and ensure that there is a trailing / in the Name field.

Check returns Exception: PG::UndefinedTable: ERROR: relation "geo_nodes" does not exist

Checking Geo ...

GitLab Geo is available ... no
  Try fixing it:
  Upload a new license that includes the GitLab Geo feature
  For more information see:
  https://about.gitlab.com/features/gitlab-geo/
GitLab Geo is enabled ... Exception: PG::UndefinedTable: ERROR:  relation "geo_nodes" does not exist
LINE 8:                WHERE a.attrelid = '"geo_nodes"'::regclass
                                          ^
:               SELECT a.attname, format_type(a.atttypid, a.atttypmod),
                     pg_get_expr(d.adbin, d.adrelid), a.attnotnull, a.atttypid, a.atttypmod,
                     c.collname, col_description(a.attrelid, a.attnum) AS comment
                FROM pg_attribute a
                LEFT JOIN pg_attrdef d ON a.attrelid = d.adrelid AND a.attnum = d.adnum
                LEFT JOIN pg_type t ON a.atttypid = t.oid
                LEFT JOIN pg_collation c ON a.attcollation = c.oid AND a.attcollation <> t.typcollation
               WHERE a.attrelid = '"geo_nodes"'::regclass
                 AND a.attnum > 0 AND NOT a.attisdropped
               ORDER BY a.attnum
...
Checking Geo ... Finished

When performing a PostgreSQL major version (9 > 10) update this is expected. Follow:

initiate-the-replication-process

Fixing replication errors

The following sections outline troubleshooting steps for fixing replication errors (indicated by Database replication working? ... no in the geo:check output.

Message: `ERROR: replication slots can only be used if max_replication_slots > 0`?

This means that the max_replication_slots PostgreSQL variable needs to be set on the primary database. In GitLab 9.4, we have made this setting default to 1. You may need to increase this value if you have more secondary nodes.

Be sure to restart PostgreSQL for this to take effect. See the PostgreSQL replication setup guide for more details.

Message: `FATAL: could not start WAL streaming: ERROR: replication slot "geo_secondary_my_domain_com" does not exist`?

This occurs when PostgreSQL does not have a replication slot for the secondary node by that name.

You may want to rerun the replication process on the secondary node .

Message: "Command exceeded allowed execution time" when setting up replication?

This may happen while initiating the replication process on the secondary node, and indicates that your initial dataset is too large to be replicated in the default timeout (30 minutes).

Re-run gitlab-ctl replicate-geo-database, but include a larger value for --backup-timeout:

sudo gitlab-ctl \
   replicate-geo-database \
   --host=<primary_node_hostname> \
   --slot-name=<secondary_slot_name> \
   --backup-timeout=21600

This will give the initial replication up to six hours to complete, rather than the default thirty minutes. Adjust as required for your installation.

Message: "PANIC: could not write to file `pg_xlog/xlogtemp.123`: No space left on device"

Determine if you have any unused replication slots in the primary database. This can cause large amounts of log data to build up in pg_xlog. Removing the unused slots can reduce the amount of space used in the pg_xlog.

Start a PostgreSQL console session:
```
sudo gitlab-psql
```
NOTE: Using gitlab-rails dbconsole will not work, because managing replication slots requires superuser permissions.
View your replication slots with:
```
SELECT * FROM pg_replication_slots;
```

Slots where active is f are not active.

When this slot should be active, because you have a secondary node configured using that slot, log in to that secondary node and check the PostgreSQL logs why the replication is not running.
If you are no longer using the slot (e.g. you no longer have Geo enabled), you can remove it with in the PostgreSQL console session:
```
SELECT pg_drop_replication_slot('<name_of_extra_slot>');
```

Message: "ERROR: canceling statement due to conflict with recovery"

This error may rarely occur under normal usage, and the system is resilient enough to recover.

However, under certain conditions, some database queries on secondaries may run excessively long, which increases the frequency of this error. At some point, some of these queries will never be able to complete due to being canceled every time.

These long-running queries are planned to be removed in the future, but as a workaround, we recommend enabling hot_standby_feedback. This increases the likelihood of bloat on the primary node as it prevents VACUUM from removing recently-dead rows. However, it has been used successfully in production on GitLab.com.

To enable hot_standby_feedback, add the following to /etc/gitlab/gitlab.rb on the secondary node:

postgresql['hot_standby_feedback'] = 'on'

Then reconfigure GitLab:

sudo gitlab-ctl reconfigure

To help us resolve this problem, consider commenting on the issue.

Message: `LOG: invalid CIDR mask in address`

This happens on wrongly-formatted addresses in postgresql['md5_auth_cidr_addresses'].

2020-03-20_23:59:57.60499 LOG:  invalid CIDR mask in address "***"
2020-03-20_23:59:57.60501 CONTEXT:  line 74 of configuration file "/var/opt/gitlab/postgresql/data/pg_hba.conf"

To fix this, update the IP addresses in /etc/gitlab/gitlab.rb under postgresql['md5_auth_cidr_addresses'] to respect the CIDR format (i.e. 1.2.3.4/32).

Message: `LOG: invalid IP mask "md5": Name or service not known`

This happens when you have added IP addresses without a subnet mask in postgresql['md5_auth_cidr_addresses'].

2020-03-21_00:23:01.97353 LOG:  invalid IP mask "md5": Name or service not known
2020-03-21_00:23:01.97354 CONTEXT:  line 75 of configuration file "/var/opt/gitlab/postgresql/data/pg_hba.conf"

To fix this, add the subnet mask in /etc/gitlab/gitlab.rb under postgresql['md5_auth_cidr_addresses'] to respect the CIDR format (i.e. 1.2.3.4/32).

Message: `Found data in the gitlabhq_production database!` when running `gitlab-ctl replicate-geo-database`

This happens if data is detected in the projects table. When one or more projects are detected, the operation is aborted to prevent accidental data loss. To bypass this message, pass the --force option to the command.

In GitLab 13.4, a seed project is added when GitLab is first installed. This makes it necessary to pass --force even on a new Geo secondary node. There is an issue to account for seed projects when checking the database.

Message: `Synchronization failed - Error syncing repository`

WARNING: If large repositories are affected by this problem, their resync may take a long time and cause significant load on your Geo nodes, storage and network systems.

If you get the error Synchronization failed - Error syncing repository along with the following log messages, this indicates that the expected geo remote is not present in the .git/config file of a repository on the secondary Geo node's filesystem:

{
  "created": "@1603481145.084348757",
  "description": "Error received from peer unix:/var/opt/gitlab/gitaly/gitaly.socket",
  …
  "grpc_message": "exit status 128",
  "grpc_status": 13
}
{  …
  "grpc.request.fullMethod": "/gitaly.RemoteService/FindRemoteRootRef",
  "grpc.request.glProjectPath": "<namespace>/<project>",
  …
  "level": "error",
  "msg": "fatal: 'geo' does not appear to be a git repository
          fatal: Could not read from remote repository. …",
}

To solve this:

Log into the secondary Geo node.
Back up the .git folder.
Optional: Spot-check) a few of those IDs whether they indeed correspond to a project with known Geo replication failures. Use fatal: 'geo' as the grep term and the following API call:
```
curl --request GET --header "PRIVATE-TOKEN: <your_access_token>" "https://gitlab.example.com/api/v4/projects/<first_failed_geo_sync_ID>"
```

Enter the Rails console and run:

failed_geo_syncs = Geo::ProjectRegistry.failed.pluck(:id)
failed_geo_syncs.each do |fgs|
  puts Geo::ProjectRegistry.failed.find(fgs).project_id
end

Run the following commands to reset each project's Geo-related attributes and execute a new sync:

failed_geo_syncs.each do |fgs|
  registry = Geo::ProjectRegistry.failed.find(fgs)
  registry.update(resync_repository: true, force_to_redownload_repository: false, repository_retry_count: 0)
  Geo::RepositorySyncService.new(registry.project).execute
end

Very large repositories never successfully synchronize on the secondary node

GitLab places a timeout on all repository clones, including project imports and Geo synchronization operations. If a fresh git clone of a repository on the primary takes more than the default three hours, you may be affected by this.

To increase the timeout, add the following line to /etc/gitlab/gitlab.rb on the secondary node:

gitlab_rails['gitlab_shell_git_timeout'] = 14400

Then reconfigure GitLab:

sudo gitlab-ctl reconfigure

This will increase the timeout to four hours (14400 seconds). Choose a time long enough to accommodate a full clone of your largest repositories.

New LFS objects are never replicated

If new LFS objects are never replicated to secondary Geo nodes, check the version of GitLab you are running. GitLab versions 11.11.x or 12.0.x are affected by a bug that results in new LFS objects not being replicated to Geo secondary nodes.

To resolve the issue, upgrade to GitLab 12.1 or newer.

Failures during backfill

During a backfill, failures are scheduled to be retried at the end of the backfill queue, therefore these failures only clear up after the backfill completes.

Resetting Geo secondary node replication

If you get a secondary node in a broken state and want to reset the replication state, to start again from scratch, there are a few steps that can help you:

Stop Sidekiq and the Geo LogCursor

It's possible to make Sidekiq stop gracefully, but making it stop getting new jobs and wait until the current jobs to finish processing.

You need to send a SIGTSTP kill signal for the first phase and them a SIGTERM when all jobs have finished. Otherwise just use the gitlab-ctl stop commands.
```
gitlab-ctl status sidekiq
# run: sidekiq: (pid 10180) <- this is the PID you will use
kill -TSTP 10180 # change to the correct PID

gitlab-ctl stop sidekiq
gitlab-ctl stop geo-logcursor
```
You can watch Sidekiq logs to know when Sidekiq jobs processing have finished:
```
gitlab-ctl tail sidekiq
```
Rename repository storage folders and create new ones. If you are not concerned about possible orphaned directories and files, then you can simply skip this step.
```
mv /var/opt/gitlab/git-data/repositories /var/opt/gitlab/git-data/repositories.old
mkdir -p /var/opt/gitlab/git-data/repositories
chown git:git /var/opt/gitlab/git-data/repositories
```
NOTE: You may want to remove the /var/opt/gitlab/git-data/repositories.old in the future as soon as you confirmed that you don't need it anymore, to save disk space.
(Optional) Rename other data folders and create new ones

WARNING: You may still have files on the secondary node that have been removed from primary node but removal have not been reflected. If you skip this step, they will never be removed from this Geo node.

Any uploaded content like file attachments, avatars or LFS objects are stored in a subfolder in one of the two paths below:
- /var/opt/gitlab/gitlab-rails/shared
- /var/opt/gitlab/gitlab-rails/uploads
To rename all of them:
```
gitlab-ctl stop

mv /var/opt/gitlab/gitlab-rails/shared /var/opt/gitlab/gitlab-rails/shared.old
mkdir -p /var/opt/gitlab/gitlab-rails/shared

mv /var/opt/gitlab/gitlab-rails/uploads /var/opt/gitlab/gitlab-rails/uploads.old
mkdir -p /var/opt/gitlab/gitlab-rails/uploads

gitlab-ctl start postgresql
gitlab-ctl start geo-postgresql
```
Reconfigure to recreate the folders and make sure permissions and ownership are correct:
```
gitlab-ctl reconfigure
```

Reset the Tracking Database

gitlab-rake geo:db:drop  # on a secondary app node
gitlab-ctl reconfigure   # on the tracking database node
gitlab-rake geo:db:setup # on a secondary app node

Restart previously stopped services
```
gitlab-ctl start
```

Fixing errors during a failover or when promoting a secondary to a primary node

The following are possible errors that might be encountered during failover or when promoting a secondary to a primary node with strategies to resolve them.

Message: ActiveRecord::RecordInvalid: Validation failed: Name has already been taken

When promoting a secondary node, you might encounter the following error:

Running gitlab-rake geo:set_secondary_as_primary...

rake aborted!
ActiveRecord::RecordInvalid: Validation failed: Name has already been taken
/opt/gitlab/embedded/service/gitlab-rails/ee/lib/tasks/geo.rake:236:in `block (3 levels) in <top (required)>'
/opt/gitlab/embedded/service/gitlab-rails/ee/lib/tasks/geo.rake:221:in `block (2 levels) in <top (required)>'
/opt/gitlab/embedded/bin/bundle:23:in `load'
/opt/gitlab/embedded/bin/bundle:23:in `<main>'
Tasks: TOP => geo:set_secondary_as_primary
(See full trace by running task with --trace)

You successfully promoted this node!

If you encounter this message when running gitlab-rake geo:set_secondary_as_primary or gitlab-ctl promote-to-primary-node, either:

Enter a Rails console and run:

Rails.application.load_tasks; nil
Gitlab::Geo.expire_cache!
Rake::Task['geo:set_secondary_as_primary'].invoke

Upgrade to GitLab 12.6.3 or newer if it is safe to do so. For example, if the failover was just a test. A caching-related bug was fixed.

Message: ActiveRecord::RecordInvalid: Validation failed: Enabled Geo primary node cannot be disabled

If you disabled a secondary node, either with the replication pause task (13.2) or by using the user interface (13.1 and earlier), you must first re-enable the node before you can continue. This is fixed in 13.4.

Run the following command, replacing https://<secondary url>/ with the URL for your secondary server, using either http or https, and ensuring that you end the URL with a slash (/):

sudo gitlab-rails dbconsole

UPDATE geo_nodes SET enabled = true WHERE url = 'https://<secondary url>/' AND enabled = false;"

This should update 1 row.

Message: NoMethodError: undefined method `secondary?' for nil:NilClass

When promoting a secondary node, you might encounter the following error:

sudo gitlab-rake geo:set_secondary_as_primary

rake aborted!
NoMethodError: undefined method `secondary?' for nil:NilClass
/opt/gitlab/embedded/service/gitlab-rails/ee/lib/tasks/geo.rake:232:in `block (3 levels) in <top (required)>'
/opt/gitlab/embedded/service/gitlab-rails/ee/lib/tasks/geo.rake:221:in `block (2 levels) in <top (required)>'
/opt/gitlab/embedded/bin/bundle:23:in `load'
/opt/gitlab/embedded/bin/bundle:23:in `<main>'
Tasks: TOP => geo:set_secondary_as_primary
(See full trace by running task with --trace)

This command is intended to be executed on a secondary node only, and this error is displayed if you attempt to run this command on a primary node.

Message: `sudo: gitlab-pg-ctl: command not found`

When promoting a secondary node with multiple servers, you need to run the gitlab-pg-ctl command to promote the PostgreSQL read-replica database.

In GitLab 12.8 and earlier, this command will fail with the message:

sudo: gitlab-pg-ctl: command not found

In this case, the workaround is to use the full path to the binary, for example:

sudo /opt/gitlab/embedded/bin/gitlab-pg-ctl promote

GitLab 12.9 and later are unaffected by this error.

Message: `ERROR - Replication is not up-to-date` during `gitlab-ctl promotion-preflight-checks`

Message: `ERROR - Replication is not up-to-date` during `gitlab-ctl promote-to-primary-node`

In GitLab 13.7 and earlier, if you have a data type with zero items to sync, this command reports ERROR - Replication is not up-to-date even if replication is actually up-to-date. If replication and verification output shows that it is complete, you can add --skip-preflight-checks to make the command complete promotion. This bug was fixed in GitLab 13.8 and later.

Errors when using `--skip-preflight-checks` or `--force`

Before GitLab 13.5, you could bump into one of the following errors when using --skip-preflight-checks or --force:

get_ctl_options': invalid option: --skip-preflight-checks (OptionParser::InvalidOption)

get_ctl_options': invalid option: --force (OptionParser::InvalidOption)

This can happen with XFS or filesystems that list files in lexical order, because the load order of the Omnibus command files can be different than expected, and a global function would get redefined. More details can be found in the related issue.

The workaround is to manually run the preflight checks and promote the database, by running the following commands on the Geo secondary site:

sudo gitlab-ctl promotion-preflight-checks
sudo /opt/gitlab/embedded/bin/gitlab-pg-ctl promote
sudo gitlab-ctl reconfigure
sudo gitlab-rake geo:set_secondary_as_primary

## Expired artifacts

If you notice for some reason there are more artifacts on the Geo
secondary node than on the Geo primary node, you can use the Rake task
to [cleanup orphan artifact files](../../../raketasks/cleanup.md#remove-orphan-artifact-files).

On a Geo **secondary** node, this command will also clean up all Geo
registry record related to the orphan files on disk.

## Fixing sign in errors

### Message: The redirect URI included is not valid

If you are able to log in to the **primary** node, but you receive this error
when attempting to log into a **secondary**, you should check that the Geo
node's URL matches its external URL.

On the **primary** node:

1. On the top bar, select **Menu >** **{admin}** **Admin**.
1. On the left sidebar, select **Geo > Nodes**.
1. Find the affected **secondary** site and select **Edit**.
1. Ensure the **URL** field matches the value found in `/etc/gitlab/gitlab.rb`
   in `external_url "https://gitlab.example.com"` on the frontend server(s) of
   the **secondary** node.

## Fixing common errors

This section documents common errors reported in the Admin Area and how to fix them.

### Geo database configuration file is missing

GitLab cannot find or doesn't have permission to access the `database_geo.yml` configuration file.

In an Omnibus GitLab installation, the file should be in `/var/opt/gitlab/gitlab-rails/etc`.
If it doesn't exist or inadvertent changes have been made to it, run `sudo gitlab-ctl reconfigure` to restore it to its correct state.

If this path is mounted on a remote volume, ensure your volume configuration
has the correct permissions.

### An existing tracking database cannot be reused

Geo cannot reuse an existing tracking database.

It is safest to use a fresh secondary, or reset the whole secondary by following
[Resetting Geo secondary node replication](#resetting-geo-secondary-node-replication).

### Geo node has a database that is writable which is an indication it is not configured for replication with the primary node

This error refers to a problem with the database replica on a **secondary** node,
which Geo expects to have access to. It usually means, either:

- An unsupported replication method was used (for example, logical replication).
- The instructions to setup a [Geo database replication](../setup/database.md) were not followed correctly.
- Your database connection details are incorrect, that is you have specified the wrong
  user in your `/etc/gitlab/gitlab.rb` file.

A common source of confusion with **secondary** nodes is that it requires two separate
PostgreSQL instances:

- A read-only replica of the **primary** node.
- A regular, writable instance that holds replication metadata. That is, the Geo tracking database.

### Geo node does not appear to be replicating the database from the primary node

The most common problems that prevent the database from replicating correctly are:

- **Secondary** nodes cannot reach the **primary** node. Check credentials, firewall rules, etc.
- SSL certificate problems. Make sure you copied `/etc/gitlab/gitlab-secrets.json` from the **primary** node.
- Database storage disk is full.
- Database replication slot is misconfigured.
- Database is not using a replication slot or another alternative and cannot catch-up because WAL files were purged.

Make sure you follow the [Geo database replication](../setup/database.md) instructions for supported configuration.

### Geo database version (...) does not match latest migration (...)

If you are using Omnibus GitLab installation, something might have failed during upgrade. You can:

- Run `sudo gitlab-ctl reconfigure`.
- Manually trigger the database migration by running: `sudo gitlab-rake geo:db:migrate` as root on the **secondary** node.

### GitLab indicates that more than 100% of repositories were synced

This can be caused by orphaned records in the project registry. You can clear them
[using a Rake task](../../../administration/raketasks/geo.md#remove-orphaned-project-registries).

### Geo Admin Area returns 404 error for a secondary node

Sometimes `sudo gitlab-rake gitlab:geo:check` indicates that the **secondary** node is
healthy, but a 404 error for the **secondary** node is returned in the Geo Admin Area on
the **primary** node.

To resolve this issue:

- Try restarting the **secondary** using `sudo gitlab-ctl restart`.
- Check `/var/log/gitlab/gitlab-rails/geo.log` to see if the **secondary** node is
  using IPv6 to send its status to the **primary** node. If it is, add an entry to
  the **primary** node using IPv4 in the `/etc/hosts` file. Alternatively, you should
  [enable IPv6 on the **primary** node](https://docs.gitlab.com/omnibus/settings/nginx.html#setting-the-nginx-listen-address-or-addresses).

### Geo Admin Area shows 'Unknown' for health status and 'Request failed with status code 401'

If using a load balancer, ensure that the load balancer's URL is set as the `external_url` in the
`/etc/gitlab/gitlab.rb` of the nodes behind the load balancer.

### GitLab Pages return 404 errors after promoting

This is due to [Pages data not being managed by Geo](datatypes.md#limitations-on-replicationverification).
Find advice to resolve those errors in the
[Pages administration documentation](../../../administration/pages/index.md#404-error-after-promoting-a-geo-secondary-to-a-primary-node).

## Fixing client errors

### Authorization errors from LFS HTTP(s) client requests

You may have problems if you're running a version of [Git LFS](https://git-lfs.github.com/) before 2.4.2.
As noted in [this authentication issue](https://github.com/git-lfs/git-lfs/issues/3025),
requests redirected from the secondary to the primary node do not properly send the
Authorization header. This may result in either an infinite `Authorization <-> Redirect`
loop, or Authorization errors.