165 lines
4.5 KiB
Markdown
165 lines
4.5 KiB
Markdown
---
|
|
type: concepts, howto
|
|
---
|
|
|
|
# Health Check **(CORE ONLY)**
|
|
|
|
> - Liveness and readiness probes were [introduced](https://gitlab.com/gitlab-org/gitlab-foss/-/merge_requests/10416) in GitLab 9.1.
|
|
> - The `health_check` endpoint was [introduced](https://gitlab.com/gitlab-org/gitlab-foss/-/merge_requests/3888) in GitLab 8.8 and was
|
|
> deprecated in GitLab 9.1.
|
|
> - [Access token](#access-token-deprecated) has been deprecated in GitLab 9.4
|
|
> in favor of [IP whitelist](#ip-whitelist).
|
|
|
|
GitLab provides liveness and readiness probes to indicate service health and
|
|
reachability to required services. These probes report on the status of the
|
|
database connection, Redis connection, and access to the filesystem. These
|
|
endpoints [can be provided to schedulers like Kubernetes](https://kubernetes.io/docs/tasks/configure-pod-container/configure-liveness-readiness-startup-probes/) to hold
|
|
traffic until the system is ready or restart the container as needed.
|
|
|
|
## IP whitelist
|
|
|
|
To access monitoring resources, the requesting client IP needs to be included in a whitelist.
|
|
For details, see [how to add IPs to a whitelist for the monitoring endpoints](../../../administration/monitoring/ip_whitelist.md).
|
|
|
|
## Using the endpoints locally
|
|
|
|
With default whitelist settings, the probes can be accessed from localhost using the following URLs:
|
|
|
|
```plaintext
|
|
GET http://localhost/-/health
|
|
```
|
|
|
|
```plaintext
|
|
GET http://localhost/-/readiness
|
|
```
|
|
|
|
```plaintext
|
|
GET http://localhost/-/liveness
|
|
```
|
|
|
|
## Health
|
|
|
|
Checks whether the application server is running.
|
|
It does not verify the database or other services
|
|
are running. This endpoint circumvents Rails Controllers
|
|
and is implemented as additional middleware `BasicHealthCheck`
|
|
very early into the request processing lifecycle.
|
|
|
|
```plaintext
|
|
GET /-/health
|
|
```
|
|
|
|
Example request:
|
|
|
|
```shell
|
|
curl 'https://gitlab.example.com/-/health'
|
|
```
|
|
|
|
Example response:
|
|
|
|
```plaintext
|
|
GitLab OK
|
|
```
|
|
|
|
## Readiness
|
|
|
|
The readiness probe checks whether the GitLab instance is ready
|
|
to accept traffic via Rails Controllers. The check by default
|
|
does validate only instance-checks.
|
|
|
|
If the `all=1` parameter is specified, the check will also validate
|
|
the dependent services (Database, Redis, Gitaly etc.)
|
|
and gives a status for each.
|
|
|
|
```plaintext
|
|
GET /-/readiness
|
|
GET /-/readiness?all=1
|
|
```
|
|
|
|
Example request:
|
|
|
|
```shell
|
|
curl 'https://gitlab.example.com/-/readiness'
|
|
```
|
|
|
|
Example response:
|
|
|
|
```json
|
|
{
|
|
"master_check":[{
|
|
"status":"failed",
|
|
"message": "unexpected Master check result: false"
|
|
}],
|
|
...
|
|
}
|
|
```
|
|
|
|
On failure, the endpoint will return a `503` HTTP status code.
|
|
|
|
This check does hit the database and Redis if authenticated via `token`.
|
|
|
|
This check is being exempt from Rack Attack.
|
|
|
|
## Liveness
|
|
|
|
DANGER: **Warning:**
|
|
In GitLab [12.4](https://about.gitlab.com/upcoming-releases/)
|
|
the response body of the Liveness check was changed
|
|
to match the example below.
|
|
|
|
Checks whether the application server is running.
|
|
This probe is used to know if Rails Controllers
|
|
are not deadlocked due to a multi-threading.
|
|
|
|
```plaintext
|
|
GET /-/liveness
|
|
```
|
|
|
|
Example request:
|
|
|
|
```shell
|
|
curl 'https://gitlab.example.com/-/liveness'
|
|
```
|
|
|
|
Example response:
|
|
|
|
On success, the endpoint will return a `200` HTTP status code, and a response like below.
|
|
|
|
```json
|
|
{
|
|
"status": "ok"
|
|
}
|
|
```
|
|
|
|
On failure, the endpoint will return a `503` HTTP status code.
|
|
|
|
This check is being exempt from Rack Attack.
|
|
|
|
## Access token (Deprecated)
|
|
|
|
> NOTE: **Note:**
|
|
> Access token has been deprecated in GitLab 9.4 in favor of [IP whitelist](#ip-whitelist).
|
|
|
|
An access token needs to be provided while accessing the probe endpoints. The current
|
|
accepted token can be found under the **Admin Area > Monitoring > Health check**
|
|
(`admin/health_check`) page of your GitLab instance.
|
|
|
|
![access token](img/health_check_token.png)
|
|
|
|
The access token can be passed as a URL parameter:
|
|
|
|
```plaintext
|
|
https://gitlab.example.com/-/readiness?token=ACCESS_TOKEN
|
|
```
|
|
|
|
<!-- ## Troubleshooting
|
|
|
|
Include any troubleshooting steps that you can foresee. If you know beforehand what issues
|
|
one might have when setting this up, or when something is changed, or on upgrading, it's
|
|
important to describe those, too. Think of things that may go wrong and include them here.
|
|
This is important to minimize requests for support, and to avoid doc comments with
|
|
questions that you know someone might ask.
|
|
|
|
Each scenario can be a third-level heading, e.g. `### Getting error message X`.
|
|
If you have none to add when creating a doc, leave this section in place
|
|
but commented out to help encourage others to add to it in the future. -->
|