--- stage: Create group: Gitaly info: To determine the technical writer assigned to the Stage/Group associated with this page, see https://about.gitlab.com/handbook/engineering/ux/technical-writing/#assignments --- # Troubleshooting Gitaly and Gitaly Cluster **(FREE SELF)** Refer to the information below when troubleshooting Gitaly and Gitaly Cluster. ## Troubleshoot Gitaly The following sections provide possible solutions to Gitaly errors. See also [Gitaly timeout](../../user/admin_area/settings/gitaly_timeouts.md) settings, and our advice on [parsing the `gitaly/current` file](../troubleshooting/log_parsing.md#parsing-gitalycurrent). ### Check versions when using standalone Gitaly servers When using standalone Gitaly servers, you must make sure they are the same version as GitLab to ensure full compatibility: 1. On the top bar, select **Menu > Admin** on your GitLab instance. 1. On the left sidebar, select **Overview > Gitaly Servers**. 1. Confirm all Gitaly servers indicate that they are up to date. ### Use `gitaly-debug` The `gitaly-debug` command provides "production debugging" tools for Gitaly and Git performance. It is intended to help production engineers and support engineers investigate Gitaly performance problems. If you're using GitLab 11.6 or newer, this tool should be installed on your GitLab or Gitaly server already at `/opt/gitlab/embedded/bin/gitaly-debug`. If you're investigating an older GitLab version you can compile this tool offline and copy the executable to your server: ```shell git clone https://gitlab.com/gitlab-org/gitaly.git cd cmd/gitaly-debug GOOS=linux GOARCH=amd64 go build -o gitaly-debug ``` To see the help page of `gitaly-debug` for a list of supported sub-commands, run: ```shell gitaly-debug -h ``` ### Commits, pushes, and clones return a 401 ```plaintext remote: GitLab: 401 Unauthorized ``` You need to sync your `gitlab-secrets.json` file with your GitLab application nodes. ### Client side gRPC logs Gitaly uses the [gRPC](https://grpc.io/) RPC framework. The Ruby gRPC client has its own log file which may contain useful information when you are seeing Gitaly errors. You can control the log level of the gRPC client with the `GRPC_LOG_LEVEL` environment variable. The default level is `WARN`. You can run a gRPC trace with: ```shell sudo GRPC_TRACE=all GRPC_VERBOSITY=DEBUG gitlab-rake gitlab:gitaly:check ``` ### Server side gRPC logs gRPC tracing can also be enabled in Gitaly itself with the `GODEBUG=http2debug` environment variable. To set this in an Omnibus GitLab install: 1. Add the following to your `gitlab.rb` file: ```ruby gitaly['env'] = { "GODEBUG=http2debug" => "2" } ``` 1. [Reconfigure](../restart_gitlab.md#omnibus-gitlab-reconfigure) GitLab. ### Correlating Git processes with RPCs Sometimes you need to find out which Gitaly RPC created a particular Git process. One method for doing this is by using `DEBUG` logging. However, this needs to be enabled ahead of time and the logs produced are quite verbose. A lightweight method for doing this correlation is by inspecting the environment of the Git process (using its `PID`) and looking at the `CORRELATION_ID` variable: ```shell PID= sudo cat /proc/$PID/environ | tr '\0' '\n' | grep ^CORRELATION_ID= ``` This method isn't reliable for `git cat-file` processes, because Gitaly internally pools and re-uses those across RPCs. ### Observing `gitaly-ruby` traffic [`gitaly-ruby`](configure_gitaly.md#gitaly-ruby) is an internal implementation detail of Gitaly, so, there's not that much visibility into what goes on inside `gitaly-ruby` processes. If you have Prometheus set up to scrape your Gitaly process, you can see request rates and error codes for individual RPCs in `gitaly-ruby` by querying `grpc_client_handled_total`. - In theory, this metric does not differentiate between `gitaly-ruby` and other RPCs. - In practice from GitLab 11.9, all gRPC calls made by Gitaly itself are internal calls from the main Gitaly process to one of its `gitaly-ruby` sidecars. Assuming your `grpc_client_handled_total` counter only observes Gitaly, the following query shows you RPCs are (most likely) internally implemented as calls to `gitaly-ruby`: ```prometheus sum(rate(grpc_client_handled_total[5m])) by (grpc_method) > 0 ``` ### Repository changes fail with a `401 Unauthorized` error If you run Gitaly on its own server and notice these conditions: - Users can successfully clone and fetch repositories by using both SSH and HTTPS. - Users can't push to repositories, or receive a `401 Unauthorized` message when attempting to make changes to them in the web UI. Gitaly may be failing to authenticate with the Gitaly client because it has the [wrong secrets file](configure_gitaly.md#configure-gitaly-servers). Confirm the following are all true: - When any user performs a `git push` to any repository on this Gitaly server, it fails with a `401 Unauthorized` error: ```shell remote: GitLab: 401 Unauthorized To ! [remote rejected] branch-name -> branch-name (pre-receive hook declined) error: failed to push some refs to '' ``` - When any user adds or modifies a file from the repository using the GitLab UI, it immediately fails with a red `401 Unauthorized` banner. - Creating a new project and [initializing it with a README](../../user/project/working_with_projects.md#create-a-blank-project) successfully creates the project but doesn't create the README. - When [tailing the logs](https://docs.gitlab.com/omnibus/settings/logs.html#tail-logs-in-a-console-on-the-server) on a Gitaly client and reproducing the error, you get `401` errors when reaching the [`/api/v4/internal/allowed`](../../development/internal_api/index.md) endpoint: ```shell # api_json.log { "time": "2019-07-18T00:30:14.967Z", "severity": "INFO", "duration": 0.57, "db": 0, "view": 0.57, "status": 401, "method": "POST", "path": "\/api\/v4\/internal\/allowed", "params": [ { "key": "action", "value": "git-receive-pack" }, { "key": "changes", "value": "REDACTED" }, { "key": "gl_repository", "value": "REDACTED" }, { "key": "project", "value": "\/path\/to\/project.git" }, { "key": "protocol", "value": "web" }, { "key": "env", "value": "{\"GIT_ALTERNATE_OBJECT_DIRECTORIES\":[],\"GIT_ALTERNATE_OBJECT_DIRECTORIES_RELATIVE\":[],\"GIT_OBJECT_DIRECTORY\":null,\"GIT_OBJECT_DIRECTORY_RELATIVE\":null}" }, { "key": "user_id", "value": "2" }, { "key": "secret_token", "value": "[FILTERED]" } ], "host": "gitlab.example.com", "ip": "REDACTED", "ua": "Ruby", "route": "\/api\/:version\/internal\/allowed", "queue_duration": 4.24, "gitaly_calls": 0, "gitaly_duration": 0, "correlation_id": "XPUZqTukaP3" } # nginx_access.log [IP] - - [18/Jul/2019:00:30:14 +0000] "POST /api/v4/internal/allowed HTTP/1.1" 401 30 "" "Ruby" ``` To fix this problem, confirm that your [`gitlab-secrets.json` file](configure_gitaly.md#configure-gitaly-servers) on the Gitaly server matches the one on Gitaly client. If it doesn't match, update the secrets file on the Gitaly server to match the Gitaly client, then [reconfigure](../restart_gitlab.md#omnibus-gitlab-reconfigure). ### Repository pushes fail with a `deny updating a hidden ref` error Due to [a change](https://gitlab.com/gitlab-org/gitaly/-/merge_requests/3426) introduced in GitLab 13.12, Gitaly has read-only, internal GitLab references that users are not permitted to update. If you attempt to update internal references with `git push --mirror`, Git returns the rejection error, `deny updating a hidden ref`. The following references are read-only: - refs/environments/ - refs/keep-around/ - refs/merge-requests/ - refs/pipelines/ To mirror-push branches and tags only, and avoid attempting to mirror-push protected refs, run: ```shell git push origin +refs/heads/*:refs/heads/* +refs/tags/*:refs/tags/* ``` Any other namespaces that the administrator wants to push can be included there as well via additional patterns. ### Command line tools cannot connect to Gitaly gRPC cannot reach your Gitaly server if: - You can't connect to a Gitaly server with command-line tools. - Certain actions result in a `14: Connect Failed` error message. Verify you can reach Gitaly by using TCP: ```shell sudo gitlab-rake gitlab:tcp_check[GITALY_SERVER_IP,GITALY_LISTEN_PORT] ``` If the TCP connection: - Fails, check your network settings and your firewall rules. - Succeeds, your networking and firewall rules are correct. If you use proxy servers in your command line environment such as Bash, these can interfere with your gRPC traffic. If you use Bash or a compatible command line environment, run the following commands to determine whether you have proxy servers configured: ```shell echo $http_proxy echo $https_proxy ``` If either of these variables have a value, your Gitaly CLI connections may be getting routed through a proxy which cannot connect to Gitaly. To remove the proxy setting, run the following commands (depending on which variables had values): ```shell unset http_proxy unset https_proxy ``` ### Permission denied errors appearing in Gitaly or Praefect logs when accessing repositories You might see the following in Gitaly and Praefect logs: ```shell { ... "error":"rpc error: code = PermissionDenied desc = permission denied", "grpc.code":"PermissionDenied", "grpc.meta.client_name":"gitlab-web", "grpc.request.fullMethod":"/gitaly.ServerService/ServerInfo", "level":"warning", "msg":"finished unary call with code PermissionDenied", ... } ``` This is a GRPC call [error response code](https://grpc.github.io/grpc/core/md_doc_statuscodes.html). If this error occurs, even though [the Gitaly auth tokens are set up correctly](#praefect-errors-in-logs), it's likely that the Gitaly servers are experiencing [clock drift](https://en.wikipedia.org/wiki/Clock_drift). Ensure the Gitaly clients and servers are synchronized, and use an NTP time server to keep them synchronized. ### Gitaly not listening on new address after reconfiguring When updating the `gitaly['listen_addr']` or `gitaly['prometheus_listen_addr']` values, Gitaly may continue to listen on the old address after a `sudo gitlab-ctl reconfigure`. When this occurs, run `sudo gitlab-ctl restart` to resolve the issue. This should no longer be necessary because [this issue](https://gitlab.com/gitlab-org/gitaly/-/issues/2521) is resolved. ### Permission denied errors appearing in Gitaly logs when accessing repositories from a standalone Gitaly node If this error occurs even though file permissions are correct, it's likely that the Gitaly node is experiencing [clock drift](https://en.wikipedia.org/wiki/Clock_drift). Please ensure that the GitLab and Gitaly nodes are synchronized and use an NTP time server to keep them synchronized if possible. ### Health check warnings The following warning in `/var/log/gitlab/praefect/current` can be ignored. ```plaintext "error":"full method name not found: /grpc.health.v1.Health/Check", "msg":"error when looking up method info" ``` ### File not found errors The following errors in `/var/log/gitlab/gitaly/current` can be ignored. They are caused by the GitLab Rails application checking for specific files that do not exist in a repository. ```plaintext "error":"not found: .gitlab/route-map.yml" "error":"not found: Dockerfile" "error":"not found: .gitlab-ci.yml" ``` ### Git pushes are slow when Dynatrace is enabled Dynatrace can cause the `/opt/gitlab/embedded/bin/gitaly-hooks` reference transaction hook, to take several seconds to start up and shut down. `gitaly-hooks` is executed twice when users push, which causes a significant delay. If Git pushes are too slow when Dynatrace is enabled, disable Dynatrace. ## Troubleshoot Praefect (Gitaly Cluster) The following sections provide possible solutions to Gitaly Cluster errors. ### Check cluster health > [Introduced](https://gitlab.com/gitlab-org/omnibus-gitlab/-/merge_requests/5688) in GitLab 14.5. The `check` Praefect sub-command runs a series of checks to determine the health of the Gitaly Cluster. ```shell gitlab-ctl praefect check ``` The following sections describe the checks that are run. #### Praefect migrations Because Database migrations must be up to date for Praefect to work correctly, checks if Praefect migrations are up to date. If this check fails: 1. See the `schema_migrations` table in the database to see which migrations have run. 1. Run `praefect sql-migrate` to bring the migrations up to date. #### Node connectivity and disk access Checks if Praefect can reach all of its Gitaly nodes, and if each Gitaly node has read and write access to all of its storages. If this check fails: 1. Confirm the network addresses and tokens are set up correctly: - In the Praefect configuration. - In each Gitaly node's configuration. 1. On the Gitaly nodes, check that the `gitaly` process being run as `git`. There might be a permissions issue that is preventing Gitaly from accessing its storage directories. 1. Confirm that there are no issues with the network that connects Praefect to Gitaly nodes. #### Database read and write access Checks if Praefect can read from and write to the database. If this check fails: 1. See if the Praefect database is in recovery mode. In recovery mode, tables may be read only. To check, run: ```sql select pg_is_in_recovery() ``` 1. Confirm that the user that Praefect uses to connect to PostgreSQL has read and write access to the database. 1. See if the database has been placed into read-only mode. To check, run: ```sql show default_transaction_read_only ``` #### Inaccessible repositories Checks how many repositories are inaccessible because they are missing a primary assignment, or their primary is unavailable. If this check fails: 1. See if any Gitaly nodes are down. Run `praefect ping-nodes` to check. 1. Check if there is a high load on the Praefect database. If the Praefect database is slow to respond, it can lead health checks failing to persist to the database, leading Praefect to think nodes are unhealthy. #### Check clock synchronization > [Introduced](https://gitlab.com/gitlab-org/gitaly/-/merge_requests/4225) in GitLab 14.8. Authentication between Praefect and the Gitaly servers requires the server times to be in sync so the token check succeeds. This check helps identify the root cause of `permission denied` [errors being logged by Praefect](#permission-denied-errors-appearing-in-gitaly-or-praefect-logs-when-accessing-repositories). ### Praefect errors in logs If you receive an error, check `/var/log/gitlab/gitlab-rails/production.log`. Here are common errors and potential causes: - 500 response code - **ActionView::Template::Error (7:permission denied)** - `praefect['auth_token']` and `gitlab_rails['gitaly_token']` do not match on the GitLab server. - **Unable to save project. Error: 7:permission denied** - Secret token in `praefect['storage_nodes']` on GitLab server does not match the value in `gitaly['auth_token']` on one or more Gitaly servers. - 503 response code - **GRPC::Unavailable (14:failed to connect to all addresses)** - GitLab was unable to reach Praefect. - **GRPC::Unavailable (14:all SubCons are in TransientFailure...)** - Praefect cannot reach one or more of its child Gitaly nodes. Try running the Praefect connection checker to diagnose. ### Praefect database experiencing high CPU load Some common reasons for the Praefect database to experience elevated CPU usage include: - Prometheus metrics scrapes [running an expensive query](https://gitlab.com/gitlab-org/gitaly/-/issues/3796). If you have GitLab 14.2 or above, set `praefect['separate_database_metrics'] = true` in `gitlab.rb`. - [Read distribution caching](praefect.md#reads-distribution-caching) is disabled, increasing the number of queries made to the database when user traffic is high. Ensure read distribution caching is enabled. ### Determine primary Gitaly node To determine the primary node of a repository: - In GitLab 14.6 and later, use the [`praefect metadata`](#view-repository-metadata) subcommand. - In GitLab 13.12 to GitLab 14.5 with [repository-specific primaries](praefect.md#repository-specific-primary-nodes), use the [`gitlab:praefect:replicas` Rake task](../raketasks/praefect.md#replica-checksums). - With legacy election strategies in GitLab 13.12 and earlier, the primary was the same for all repositories in a virtual storage. To determine the current primary Gitaly node for a specific virtual storage: - Use the `Shard Primary Election` [Grafana chart](praefect.md#grafana) on the [`Gitlab Omnibus - Praefect` dashboard](https://gitlab.com/gitlab-org/grafana-dashboards/-/blob/master/omnibus/praefect.json). This is recommended. - If you do not have Grafana set up, use the following command on each host of each Praefect node: ```shell curl localhost:9652/metrics | grep gitaly_praefect_primaries` ``` ### View repository metadata > [Introduced](https://gitlab.com/gitlab-org/gitaly/-/issues/3481) in GitLab 14.6. Gitaly Cluster maintains a [metadata database](index.md#components) about the repositories stored on the cluster. Use the `praefect metadata` subcommand to inspect the metadata for troubleshooting. You can retrieve a repository's metadata by its Praefect-assigned repository ID: ```shell sudo /opt/gitlab/embedded/bin/praefect -config /var/opt/gitlab/praefect/config.toml metadata -repository-id ``` You can also retrieve a repository's metadata by its virtual storage and relative path: ```shell sudo /opt/gitlab/embedded/bin/praefect -config /var/opt/gitlab/praefect/config.toml metadata -virtual-storage -relative-path ``` #### Examples To retrieve the metadata for a repository with a Praefect-assigned repository ID of 1: ```shell sudo /opt/gitlab/embedded/bin/praefect -config /var/opt/gitlab/praefect/config.toml metadata -repository-id 1 ``` To retrieve the metadata for a repository with virtual storage `default` and relative path `@hashed/b1/7e/b17ef6d19c7a5b1ee83b907c595526dcb1eb06db8227d650d5dda0a9f4ce8cd9.git`: ```shell sudo /opt/gitlab/embedded/bin/praefect -config /var/opt/gitlab/praefect/config.toml metadata -virtual-storage default -relative-path @hashed/b1/7e/b17ef6d19c7a5b1ee83b907c595526dcb1eb06db8227d650d5dda0a9f4ce8cd9.git ``` Either of these examples retrieve the following metadata for an example repository: ```plaintext Repository ID: 54771 Virtual Storage: "default" Relative Path: "@hashed/b1/7e/b17ef6d19c7a5b1ee83b907c595526dcb1eb06db8227d650d5dda0a9f4ce8cd9.git" Replica Path: "@hashed/b1/7e/b17ef6d19c7a5b1ee83b907c595526dcb1eb06db8227d650d5dda0a9f4ce8cd9.git" Primary: "gitaly-1" Generation: 1 Replicas: - Storage: "gitaly-1" Assigned: true Generation: 1, fully up to date Healthy: true Valid Primary: true Verified At: 2021-04-01 10:04:20 +0000 UTC - Storage: "gitaly-2" Assigned: true Generation: 0, behind by 1 changes Healthy: true Valid Primary: false Verified At: unverified - Storage: "gitaly-3" Assigned: true Generation: replica not yet created Healthy: false Valid Primary: false Verified At: unverified ``` #### Available metadata The metadata retrieved by `praefect metadata` includes the fields in the following tables. | Field | Description | |:------------------|:-------------------------------------------------------------------------------------------------------------------| | `Repository ID` | Permanent unique ID assigned to the repository by Praefect. Different to the ID GitLab uses for repositories. | | `Virtual Storage` | Name of the virtual storage the repository is stored in. | | `Relative Path` | Repository's path in the virtual storage. | | `Replica Path` | Where on the Gitaly node's disk the repository's replicas are stored. | | `Primary` | Current primary of the repository. | | `Generation` | Used by Praefect to track repository changes. Each write in the repository increments the repository's generation. | | `Replicas` | A list of replicas that exist or are expected to exist. | For each replica, the following metadata is available: | `Replicas` Field | Description | |:-----------------|:-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------| | `Storage` | Name of the Gitaly storage that contains the replica. | | `Assigned` | Indicates whether the replica is expected to exist in the storage. Can be `false` if a Gitaly node is removed from the cluster or if the storage contains an extra copy after the repository's replication factor was decreased. | | `Generation` | Latest confirmed generation of the replica. It indicates:

- The replica is fully up to date if the generation matches the repository's generation.
- The replica is outdated if the replica's generation is less than the repository's generation.
- `replica not yet created` if the replica does not yet exist at all on the storage. | | `Healthy` | Indicates whether the Gitaly node that is hosting this replica is considered healthy by the consensus of Praefect nodes. | | `Valid Primary` | Indicates whether the replica is fit to serve as the primary node. If the repository's primary is not a valid primary, a failover occurs on the next write to the repository if there is another replica that is a valid primary. A replica is a valid primary if:

- It is stored on a healthy Gitaly node.
- It is fully up to date.
- It is not targeted by a pending deletion job from decreasing replication factor.
- It is assigned. | | `Verified At` | Indicates last successful verification of the replica by the [verification worker](praefect.md#repository-verification). If the replica has not yet been verified, `unverified` is displayed in place of the last successful verification time. Introduced in GitLab 15.0. | ### Check that repositories are in sync Is [some cases](index.md#known-issues) the Praefect database can get out of sync with the underlying Gitaly nodes. To check that a given repository is fully synced on all nodes, run the [`gitlab:praefect:replicas` Rake task](../raketasks/praefect.md#replica-checksums) that checksums the repository on all Gitaly nodes. The [Praefect dataloss](recovery.md#check-for-data-loss) command only checks the state of the repository in the Praefect database, and cannot be relied to detect sync problems in this scenario. ### Relation does not exist errors By default Praefect database tables are created automatically by `gitlab-ctl reconfigure` task. However, the Praefect database tables are not created on initial reconfigure and can throw errors that relations do not exist if either: - The `gitlab-ctl reconfigure` command isn't executed. - There are errors during the execution. For example: - `ERROR: relation "node_status" does not exist at character 13` - `ERROR: relation "replication_queue_lock" does not exist at character 40` - This error: ```json {"level":"error","msg":"Error updating node: pq: relation \"node_status\" does not exist","pid":210882,"praefectName":"gitlab1x4m:0.0.0.0:2305","time":"2021-04-01T19:26:19.473Z","virtual_storage":"praefect-cluster-1"} ``` To solve this, the database schema migration can be done using `sql-migrate` sub-command of the `praefect` command: ```shell $ sudo /opt/gitlab/embedded/bin/praefect -config /var/opt/gitlab/praefect/config.toml sql-migrate praefect sql-migrate: OK (applied 21 migrations) ``` ### Requests fail with 'repository scoped: invalid Repository' errors This indicates that the virtual storage name used in the [Praefect configuration](praefect.md#praefect) does not match the storage name used in [`git_data_dirs` setting](praefect.md#gitaly) for GitLab. Resolve this by matching the virtual storage names used in Praefect and GitLab configuration. ### Gitaly Cluster performance issues on cloud platforms Praefect does not require a lot of CPU or memory, and can run on small virtual machines. Cloud services may place other limits on the resources that small VMs can use, such as disk IO and network traffic. Praefect nodes generate a lot of network traffic. The following symptoms can be observed if their network bandwidth has been throttled by the cloud service: - Poor performance of Git operations. - High network latency. - High memory use by Praefect. Possible solutions: - Provision larger VMs to gain access to larger network traffic allowances. - Use your cloud service's monitoring and logging to check that the Praefect nodes are not exhausting their traffic allowances. ## Profiling Gitaly Gitaly exposes several of Golang's built-in performance profiling tools on the Prometheus listen port. For example, if Prometheus is listening on port `9236` of the GitLab server: - Get a list of running `goroutines` and their backtraces: ```shell curl --output goroutines.txt "http://:9236/debug/pprof/goroutine?debug=2" ``` - Run a CPU profile for 30 seconds: ```shell curl --output cpu.bin "http://:9236/debug/pprof/profile" ``` - Profile heap memory usage: ```shell curl --output heap.bin "http://:9236/debug/pprof/heap" ``` - Record a 5 second execution trace. This will impact Gitaly's performance while running: ```shell curl --output trace.bin "http://:9236/debug/pprof/trace?seconds=5" ``` On a host with `go` installed, the CPU profile and heap profile can be viewed in a browser: ```shell go tool pprof -http=:8001 cpu.bin go tool pprof -http=:8001 heap.bin ``` Execution traces can be viewed by running: ```shell go tool trace heap.bin ```