mirror of
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274 lines
12 KiB
Markdown
274 lines
12 KiB
Markdown
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[](https://goreportcard.com/report/github.com/TwinProduction/gatus)
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[](https://cloud.docker.com/repository/docker/twinproduction/gatus)
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A service health dashboard in Go that is meant to be used as a docker
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image with a custom configuration file.
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I personally deploy it in my Kubernetes cluster and have it monitor the status of my
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core applications: https://status.twinnation.org/
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## Table of Contents
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- [Features](#features)
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- [Usage](#usage)
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- [Configuration](#configuration)
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- [Conditions](#conditions)
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- [Docker](#docker)
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- [Running the tests](#running-the-tests)
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- [Using in Production](#using-in-production)
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- [FAQ](#faq)
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- [Sending a GraphQL request](#sending-a-graphql-request)
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- [Configuring Slack alerts](#configuring-slack-alerts)
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- [Configuring Twilio alerts](#configuring-twilio-alerts)
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- [Configuring custom alerts](#configuring-custom-alerts)
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## Features
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The main features of Gatus are:
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- **Highly flexible health check conditions**: While checking the response status may be enough for some use cases, Gatus goes much further and allows you to add conditions on the response time, the response body and even the IP address.
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- **Ability to use Gatus for user acceptance tests**: Thanks to the point above, you can leverage this application to create automated user acceptance tests.
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- **Very easy to configure**: Not only is the configuration designed to be as readable as possible, it's also extremely easy to add a new service or a new endpoint to monitor.
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- **Alerting**: While having a pretty visual dashboard is useful to keep track of the state of your application(s), you probably don't want to stare at it all day. Thus, notifications via Slack are supported out of the box with the ability to configure a custom alerting provider for any needs you might have, whether it be a different provider like PagerDuty or a custom application that manages automated rollbacks.
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- **Metrics**
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- **Low resource consumption**: As with most Go applications, the resource footprint that this application requires is negligibly small.
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## Usage
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By default, the configuration file is expected to be at `config/config.yaml`.
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You can specify a custom path by setting the `GATUS_CONFIG_FILE` environment variable.
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Here's a simple example:
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```yaml
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metrics: true # Whether to expose metrics at /metrics
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services:
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- name: twinnation # Name of your service, can be anything
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url: "https://twinnation.org/health"
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interval: 30s # Duration to wait between every status check (default: 60s)
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conditions:
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- "[STATUS] == 200" # Status must be 200
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- "[BODY].status == UP" # The json path "$.status" must be equal to UP
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- "[RESPONSE_TIME] < 300" # Response time must be under 300ms
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- name: example
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url: "https://example.org/"
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interval: 30s
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conditions:
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- "[STATUS] == 200"
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```
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This example would look like this:
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Note that you can also add environment variables in the configuration file (i.e. `$DOMAIN`, `${DOMAIN}`)
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### Configuration
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| Parameter | Description | Default |
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| -------------------------------------- | --------------------------------------------------------------- | -------------- |
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| `debug` | Whether to enable debug logs | `false` |
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| `metrics` | Whether to expose metrics at /metrics | `false` |
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| `services` | List of services to monitor | Required `[]` |
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| `services[].name` | Name of the service. Can be anything. | Required `""` |
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| `services[].url` | URL to send the request to | Required `""` |
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| `services[].conditions` | Conditions used to determine the health of the service | `[]` |
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| `services[].interval` | Duration to wait between every status check | `60s` |
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| `services[].method` | Request method | `GET` |
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| `services[].graphql` | Whether to wrap the body in a query param (`{"query":"$body"}`) | `false` |
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| `services[].body` | Request body | `""` |
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| `services[].headers` | Request headers | `{}` |
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| `services[].alerts[].type` | Type of alert. Valid types: `slack`, `twilio`, `custom` | Required `""` |
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| `services[].alerts[].enabled` | Whether to enable the alert | `false` |
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| `services[].alerts[].threshold` | Number of failures in a row needed before triggering the alert | `3` |
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| `services[].alerts[].description` | Description of the alert. Will be included in the alert sent | `""` |
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| `services[].alerts[].send-on-resolved` | Whether to send a notification once a triggered alert subsides | `false` |
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| `alerting` | Configuration for alerting | `{}` |
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| `alerting.slack` | Webhook to use for alerts of type `slack` | `""` |
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| `alerting.twilio` | Settings for alerts of type `twilio` | `""` |
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| `alerting.twilio.sid` | Twilio account SID | Required `""` |
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| `alerting.twilio.token` | Twilio auth token | Required `""` |
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| `alerting.twilio.from` | Number to send Twilio alerts from | Required `""` |
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| `alerting.twilio.to` | Number to send twilio alerts to | Required `""` |
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| `alerting.custom` | Configuration for custom actions on failure or alerts | `""` |
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| `alerting.custom.url` | Custom alerting request url | `""` |
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| `alerting.custom.body` | Custom alerting request body. | `""` |
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| `alerting.custom.headers` | Custom alerting request headers | `{}` |
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### Conditions
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Here are some examples of conditions you can use:
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| Condition | Description | Passing values | Failing values |
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| -----------------------------| ------------------------------------------------------- | ------------------------ | -------------- |
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| `[STATUS] == 200` | Status must be equal to 200 | 200 | 201, 404, ... |
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| `[STATUS] < 300` | Status must lower than 300 | 200, 201, 299 | 301, 302, ... |
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| `[STATUS] <= 299` | Status must be less than or equal to 299 | 200, 201, 299 | 301, 302, ... |
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| `[STATUS] > 400` | Status must be greater than 400 | 401, 402, 403, 404 | 400, 200, ... |
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| `[RESPONSE_TIME] < 500` | Response time must be below 500ms | 100ms, 200ms, 300ms | 500ms, 501ms |
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| `[BODY] == 1` | The body must be equal to 1 | 1 | Anything else |
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| `[BODY].data.id == 1` | The jsonpath `$.data.id` is equal to 1 | `{"data":{"id":1}}` | |
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| `[BODY].data[0].id == 1` | The jsonpath `$.data[0].id` is equal to 1 | `{"data":[{"id":1}]}` | |
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| `len([BODY].data) > 0` | Array at jsonpath `$.data` has less than 5 elements | `{"data":[{"id":1}]}` | |
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| `len([BODY].name) == 8` | String at jsonpath `$.name` has a length of 8 | `{"name":"john.doe"}` | `{"name":"bob"}` |
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## Docker
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```
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docker run -p 8080:8080 --name gatus twinproduction/gatus
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```
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## Running the tests
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```
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go test ./... -mod vendor
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```
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## Using in Production
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See the [example](example) folder.
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## FAQ
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### Sending a GraphQL request
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By setting `services[].graphql` to true, the body will automatically be wrapped by the standard GraphQL `query` parameter.
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For instance, the following configuration:
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```yaml
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services:
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- name: filter users by gender
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url: http://localhost:8080/playground
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method: POST
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graphql: true
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body: |
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{
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user(gender: "female") {
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id
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name
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gender
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avatar
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}
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}
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headers:
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Content-Type: application/json
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conditions:
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- "[STATUS] == 200"
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- "[BODY].data.user[0].gender == female"
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```
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will send a `POST` request to `http://localhost:8080/playground` with the following body:
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```json
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{"query":" {\n user(gender: \"female\") {\n id\n name\n gender\n avatar\n }\n }"}
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```
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### Configuring Slack alerts
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```yaml
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alerting:
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slack: "https://hooks.slack.com/services/**********/**********/**********"
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services:
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- name: twinnation
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interval: 30s
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url: "https://twinnation.org/health"
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alerts:
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- type: slack
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enabled: true
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description: "healthcheck failed 3 times in a row"
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send-on-resolved: true
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- type: slack
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enabled: true
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threshold: 5
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description: "healthcheck failed 5 times in a row"
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send-on-resolved: true
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conditions:
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- "[STATUS] == 200"
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- "[BODY].status == UP"
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- "[RESPONSE_TIME] < 300"
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```
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Here's an example of what the notifications look like:
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### Configuring Twilio alerts
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```yaml
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alerting:
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twilio:
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sid: "..."
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token: "..."
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from: "+1-234-567-8901"
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to: "+1-234-567-8901"
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services:
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- name: twinnation
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interval: 30s
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url: "https://twinnation.org/health"
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alerts:
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- type: twilio
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enabled: true
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threshold: 5
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description: "healthcheck failed 5 times in a row"
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conditions:
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- "[STATUS] == 200"
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- "[BODY].status == UP"
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- "[RESPONSE_TIME] < 300"
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```
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### Configuring custom alerts
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While they're called alerts, you can use this feature to call anything.
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For instance, you could automate rollbacks by having an application that keeps tracks of new deployments, and by
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leveraging Gatus, you could have Gatus call that application endpoint when a service starts failing. Your application
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would then check if the service that started failing was recently deployed, and if it was, then automatically
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roll it back.
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The values `[ALERT_DESCRIPTION]` and `[SERVICE_NAME]` are automatically substituted for the alert description and the
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service name respectively in the body (`alerting.custom.body`) as well as the url (`alerting.custom.url`).
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If you have `send-on-resolved` set to `true`, you may want to use `[ALERT_TRIGGERED_OR_RESOLVED]` to differentiate
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the notifications. It will be replaced for either `TRIGGERED` or `RESOLVED`, based on the situation.
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For all intents and purpose, we'll configure the custom alert with a Slack webhook, but you can call anything you want.
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```yaml
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alerting:
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custom:
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url: "https://hooks.slack.com/services/**********/**********/**********"
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method: "POST"
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body: |
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{
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"text": "[ALERT_TRIGGERED_OR_RESOLVED]: [SERVICE_NAME] - [ALERT_DESCRIPTION]"
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}
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services:
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- name: twinnation
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interval: 30s
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url: "https://twinnation.org/health"
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alerts:
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- type: custom
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enabled: true
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threshold: 10
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send-on-resolved: true
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description: "healthcheck failed 10 times in a row"
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conditions:
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- "[STATUS] == 200"
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- "[BODY].status == UP"
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- "[RESPONSE_TIME] < 300"
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```
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