274 lines
9.8 KiB
Markdown
274 lines
9.8 KiB
Markdown
---
|
|
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
|
|
type: reference
|
|
---
|
|
|
|
# Gitaly reference **(FREE SELF)**
|
|
|
|
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 configuration 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
|
|
```
|
|
|
|
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](index.md#useful-queries).
|
|
|
|
### TLS
|
|
|
|
Gitaly supports TLS encryption. You 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](configure_gitaly.md#enable-tls-support) about TLS in Gitaly.
|
|
|
|
### Storage
|
|
|
|
GitLab repositories are grouped into directories known as storages, such as
|
|
`/home/git/repositories`. They contain bare repositories managed
|
|
by GitLab with names, such as `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 (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, is 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/blog/2019/07/08/git-performance-on-nfs/#enter-cat-file-cache).
|
|
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:
|
|
|
|
```plaintext
|
|
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 configuration 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. We plan to
|
|
[simplify this](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 (Data Source Name) for exception monitoring. |
|
|
| `sentry_environment` | string | no | [Sentry Environment](https://docs.sentry.io/product/sentry-basics/environments/) for exception monitoring. |
|
|
| `ruby_sentry_dsn` | string | no | Sentry DSN (Data Source Name) 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` falls back to `error`.
|
|
- `trace` falls back to `debug`.
|
|
- Any other invalid log levels 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 repository. |
|
|
|
|
Example:
|
|
|
|
```toml
|
|
[[concurrency]]
|
|
rpc = "/gitaly.RepositoryService/GarbageCollect"
|
|
max_per_repo = 1
|
|
```
|