path: root/doc/administration/gitaly/reference.md

---
type: reference
---

# Gitaly reference

Gitaly is configured via a [TOML](https://github.com/toml-lang/toml)
configuration file. Unlike installations from source, in Omnibus GitLab, you
would not edit this file directly.

The configuration file is passed as an argument to the `gitaly`
executable. This is usually done by either Omnibus GitLab or your
[init](https://en.wikipedia.org/wiki/Init) script.

An [example config file](https://gitlab.com/gitlab-org/gitaly/blob/master/config.toml.example)
can be found in the Gitaly project.

## Format

At the top level, `config.toml` defines the items described on the table below.

| Name | Type | Required | Description |
| ---- | ---- | -------- | ----------- |
| `socket_path` | string | yes (if  `listen_addr` is not set) | A path which Gitaly should open a Unix socket. |
| `listen_addr` | string | yes (if `socket_path` is not set) | TCP address for Gitaly to listen on. |
| `tls_listen_addr` | string | no | TCP over TLS address for Gitaly to listen on. |
| `bin_dir`    | string | yes    | Directory containing Gitaly's executables. |
| `prometheus_listen_addr` | string | no | TCP listen address for Prometheus metrics. If not set, no Prometheus listener is started. |

For example:

```toml
socket_path = "/home/git/gitlab/tmp/sockets/private/gitaly.socket"
listen_addr = "localhost:9999"
tls_listen_addr = "localhost:8888"
bin_dir = "/home/git/gitaly"
prometheus_listen_addr = "localhost:9236"
```

### Authentication

Gitaly can be configured to reject requests that do not contain a
specific bearer token in their headers. This is a security measure to
be used when serving requests over TCP:

```toml
[auth]
# A non-empty token enables authentication.
token = "the secret token"
```

Authentication is disabled when the token setting in `config.toml` is absent or
an empty string.

It is possible to temporarily disable authentication with the `transitioning`
setting. This allows you to monitor if all clients are
authenticating correctly without causing a service outage for clients
that are not configured correctly yet:

```toml
[auth]
token = "the secret token"
transitioning = true
```

CAUTION: **Warning:**
Remember to disable `transitioning` when you are done
changing your token settings.

All authentication attempts are counted in Prometheus under
the `gitaly_authentications_total` metric.

### TLS

Gitaly supports TLS encryption. You will need to bring your own certificates as
this isn't provided automatically.

| Name | Type | Required | Description |
| ---- | ---- | -------- | ----------- |
| `certificate_path` | string | no | Path to the certificate. |
| `key_path` | string | no | Path to the key. |

```toml
tls_listen_addr = "localhost:8888"

[tls]
certificate_path = '/home/git/cert.cert'
key_path = '/home/git/key.pem'
```

[Read more](index.md#tls-support) about TLS in Gitaly.

### Storage

GitLab repositories are grouped into directories known as "storages"
(e.g., `/home/git/repositories`) containing bare repositories managed
by GitLab with names (e.g., `default`).

These names and paths are also defined in the `gitlab.yml` configuration file of
GitLab. When you run Gitaly on the same machine as GitLab, which is the default
and recommended configuration, storage paths defined in Gitaly's `config.toml`
must match those in `gitlab.yml`.

| Name | Type | Required | Description |
| ---- | ---- | -------- | ----------- |
| `storage` | array | yes | An array of storage shards. |
| `path` | string | yes | The path to the storage shard. |
| `name` | string | yes | The name of the storage shard. |

For example:

```toml
[[storage]]
path = "/path/to/storage/repositories"
name = "my_shard"

[[storage]]
path = "/path/to/other/repositories"
name = "other_storage"
```

### Git

The following values can be set in the `[git]` section of the configuration file.

| Name | Type | Required | Description |
| ---- | ---- | -------- | ----------- |
| `bin_path` | string | no | Path to Git binary. If not set, will be resolved using `PATH`. |
| `catfile_cache_size` | integer | no | Maximum number of cached [cat-file processes](#cat-file-cache). Default is `100`. |

#### `cat-file` cache

A lot of Gitaly RPCs need to look up Git objects from repositories.
Most of the time we use `git cat-file --batch` processes for that. For
better performance, Gitaly can re-use these `git cat-file` processes
across RPC calls. Previously used processes are kept around in a
["git cat-file cache"](https://about.gitlab.com/2019/07/08/git-performance-on-nfs/#enter-cat-file-cache).
In order to control how much system resources this uses, we have a maximum number
of cat-file processes that can go into the cache.

The default limit is 100 `cat-file`s, which constitute a pair of
`git cat-file --batch` and `git cat-file --batch-check` processes. If
you are seeing errors complaining about "too many open files", or an
inability to create new processes, you may want to lower this limit.

Ideally, the number should be large enough to handle normal
traffic. If you raise the limit, you should measure the cache hit ratio
before and after. If the hit ratio does not improve, the higher limit is
probably not making a meaningful difference. Here is an example
Prometheus query to see the hit rate:

```text
sum(rate(gitaly_catfile_cache_total{type="hit"}[5m])) / sum(rate(gitaly_catfile_cache_total{type=~"(hit)|(miss)"}[5m]))
```

### `gitaly-ruby`

A Gitaly process uses one or more `gitaly-ruby` helper processes to
execute RPC's implemented in Ruby instead of Go. The `[gitaly-ruby]`
section of the config file contains settings for these helper processes.

These processes are known to occasionally suffer from memory leaks.
Gitaly restarts its `gitaly-ruby` helpers when their memory exceeds the
`max_rss` limit.

| Name | Type | Required | Description |
| ---- | ---- | -------- | ----------- |
| `dir` | string | yes | Path to where gitaly-ruby is installed (needed to boot the process).|
| `max_rss` | integer | no | Resident set size limit that triggers a gitaly-ruby restart, in bytes. Default is `200000000` (200MB). |
| `graceful_restart_timeout` | string | no | Grace period before a gitaly-ruby process is forcibly terminated after exceeding `max_rss`. Default is `10m` (10 minutes).|
| `restart_delay` | string | no |Time that gitaly-ruby memory must remain high before a restart. Default is `5m` (5 minutes).|
| `num_workers` | integer | no |Number of gitaly-ruby worker processes. Try increasing this number in case of `ResourceExhausted` errors. Default is `2`, minimum is `2`.|
| `linguist_languages_path` | string | no | Override for dynamic `languages.json` discovery. Defaults to an empty string (use of dynamic discovery).|

Example:

```toml
[gitaly-ruby]
dir = "/home/git/gitaly/ruby"
max_rss = 200000000
graceful_restart_timeout = "10m"
restart_delay = "5m"
num_workers = 2
```

### GitLab Shell

For historical reasons
[GitLab Shell](https://gitlab.com/gitlab-org/gitlab-shell) contains
the Git hooks that allow GitLab to validate and react to Git pushes.
Because Gitaly "owns" Git pushes, GitLab Shell must therefore be
installed alongside Gitaly. This will be [simplified in the
future](https://gitlab.com/gitlab-org/gitaly/issues/1226).

| Name | Type | Required | Description |
| ---- | ---- | -------- | ----------- |
| `dir` | string | yes | The directory where GitLab Shell is installed.|

Example:

```toml
[gitlab-shell]
dir = "/home/git/gitlab-shell"
```

### Prometheus

You can optionally configure Gitaly to record histogram latencies on GRPC method
calls in Prometheus.

| Name | Type | Required | Description |
| ---- | ---- | -------- | ----------- |
| `grpc_latency_buckets` | array | no | Prometheus stores each observation in a bucket, which means you'd get an approximation of latency. Optimizing the buckets gives more control over the accuracy of the approximation. |

Example:

```toml
prometheus_listen_addr = "localhost:9236"

[prometheus]
grpc_latency_buckets = [0.001, 0.005, 0.025, 0.1, 0.5, 1.0, 10.0, 30.0, 60.0, 300.0, 1500.0]
```

### Logging

The following values configure logging in Gitaly under the `[logging]` section.

| Name | Type | Required | Description |
| ---- | ---- | -------- | ----------- |
| `format` | string | no | Log format: `text` or `json`. Default: `text`. |
| `level`  | string | no | Log level: `debug`, `info`, `warn`, `error`, `fatal`, or `panic`. Default: `info`. |
| `sentry_dsn` | string | no | Sentry DSN for exception monitoring. |
| `sentry_environment` | string | no | [Sentry Environment](https://docs.sentry.io/enriching-error-data/environments/) for exception monitoring. |
| `ruby_sentry_dsn` | string | no | Sentry DSN for gitaly-ruby exception monitoring. |

While the main Gitaly application logs go to stdout, there are some extra log
files that go to a configured directory, like the GitLab Shell logs.
Gitlab Shell does not support `panic` or `trace` level logs. `panic` will fall
back to `error`, while `trace` will fall back to `debug`. Any other invalid log
levels will default to `info`.

Example:

```toml
[logging]
level = "warn"
dir = "/home/gitaly/logs"
format = "json"
sentry_dsn = "https://<key>:<secret>@sentry.io/<project>"
ruby_sentry_dsn = "https://<key>:<secret>@sentry.io/<project>"
```

## Concurrency

You can adjust the `concurrency` of each RPC endpoint.

| Name | Type | Required | Description |
| ---- | ---- | -------- | ----------- |
| `concurrency` | array | yes | An array of RPC endpoints. |
| `rpc` | string | no | The name of the RPC endpoint (`/gitaly.RepositoryService/GarbageCollect`). |
| `max_per_repo` | integer | no | Concurrency per RPC per repo. |

Example:

```toml
[[concurrency]]
rpc = "/gitaly.RepositoryService/GarbageCollect"
max_per_repo = 1
```