- 1 year ago
How to write custom node exporter for collecting machine metrics with prometheus?
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To write a custom Node Exporter for collecting machine metrics with Prometheus, you can follow these steps:
Set up a development environment:
- Install Go programming language (https://golang.org/dl/) and set up the Go development environment.
- Create a new directory for your custom Node Exporter project.
Initialize a new Go module:
- Open a terminal or command prompt and navigate to your project directory.
- Run the command
go mod init <module-name>
to initialize a new Go module. Replace<module-name>
with the name of your module.
Import necessary packages:
- Open the main Go file in your project and import the required packages. You will need the
github.com/prometheus/client_golang/prometheus
package for defining metrics and thegithub.com/prometheus/client_golang/prometheus/promhttp
package for exposing metrics over HTTP.
- Open the main Go file in your project and import the required packages. You will need the
Define custom metrics:
- Use the
prometheus.NewGaugeVec()
or other functions from theprometheus
package to define custom metrics for collecting machine-related information. You can define metrics for CPU usage, memory usage, disk space, network traffic, etc. Refer to the Prometheus documentation for more details on metric types and their usage.
- Use the
Collect and update metrics:
- In your code, implement the logic to collect the desired machine metrics and update the corresponding metrics defined in the previous step. This may involve using system-specific APIs or libraries to gather the necessary information.
Expose metrics via HTTP endpoint:
- Use the
promhttp.Handler()
function to create an HTTP handler that serves the Prometheus metrics. - Register the handler with your preferred HTTP server implementation (e.g.,
http.HandleFunc()
in the standard library) to expose the metrics at a specific endpoint (e.g.,/metrics
).
- Use the
Build and run the custom Node Exporter:
- Build the Go binary by running the command
go build
in your project directory. - Run the resulting binary to start your custom Node Exporter.
- Verify that the metrics are accessible by visiting the
/metrics
endpoint in a web browser or by using Prometheus to scrape the metrics.
- Build the Go binary by running the command
Configure Prometheus to scrape the custom Node Exporter:
- Modify the Prometheus configuration file (usually
prometheus.yml
) to add a new scrape target for your custom Node Exporter. Specify the IP address and port where your Node Exporter is running.
- Modify the Prometheus configuration file (usually
Restart Prometheus:
- Restart the Prometheus service to apply the configuration changes.
- Prometheus will now scrape the metrics from your custom Node Exporter along with the other configured targets.
With these steps, you should be able to develop and deploy a custom Node Exporter for collecting machine metrics with Prometheus. Remember to consult the Prometheus documentation and refer to examples and best practices to ensure your metrics are properly defined and exposed.