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content/post/guides/nix/monitoring-via-prometheus/index.md
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@ -48,8 +48,6 @@ node_cpu_seconds_total{cpu="0",mode="softirq"} 743.4
**Grafana** **Grafana**
Grafana is an open-source data visualization and monitoring platform. It has hundreds of features embedded that can help you query from data sources like Prometheus, InfluxDB, MySQL and so on... Grafana is an open-source data visualization and monitoring platform. It has hundreds of features embedded that can help you query from data sources like Prometheus, InfluxDB, MySQL and so on...
For todays guide I will show you how to setup a few exporters (node-exporter, smartctl) and collect their metrics with prometheus. Then visualize that data via graphana.
## NixOs ## NixOs
Nix makes it trivial to set up these services, as there are already predefined options for it in nixpkgs. I will give you example configuration files below that you can just copy and paste. Nix makes it trivial to set up these services, as there are already predefined options for it in nixpkgs. I will give you example configuration files below that you can just copy and paste.
@ -98,8 +96,8 @@ First is node-exporter. It exports all kind of system metrics ranging from cpu u
#### Smartctl #### Smartctl
Smartctl is a tool included in the smartmontools package. This is a collection of monitoring tools for hard-drives, SSDs and filesystems. Smartctl is a tool included in the smartmontools package. It is a collection of monitoring tools for hard-drives, SSDs and filesystems.
This exporter enables you to check up on the health of your drive(s). And it will also give you a wall notification if one of your drives has a bad sector(s), which mainly suggests it's dying off. This exporter enables you to check up on the health of your drive(s). And it will also give you a wall notifications if one of your drives has a bad sector(s), which mainly suggests it's dying off.
```nix ```nix
# /services/monitoring/exporters/smartctl.nix # /services/monitoring/exporters/smartctl.nix
@ -184,7 +182,7 @@ Here is a config file for prometheus, with the scrape configs already written do
} }
``` ```
I recommend setting the 5s delay to a bigger number as you can imagine it can generate a lot of data. I recommend setting the 5s delay to a bigger number if you have little storage as you can imagine it can generate a lot of data.
~16kB average per scrape (node-exporter). 1 day has 86400 seconds, divide that by 5 thats 17280 scrapes a day. ~16kB average per scrape (node-exporter). 1 day has 86400 seconds, divide that by 5 thats 17280 scrapes a day.
17280 \* 16 = 276480 kB. Thats 270 megabytes a day. And if you have multiple servers that causes X times as much. 17280 \* 16 = 276480 kB. Thats 270 megabytes a day. And if you have multiple servers that causes X times as much.
30 days of scarping is about 8 gigabytes (1x). **But remember, by default prometheus stores data for 30 days!** 30 days of scarping is about 8 gigabytes (1x). **But remember, by default prometheus stores data for 30 days!**
@ -233,7 +231,7 @@ If you want to access it via the internet, change the following:
- `http_addr = "127.0.0.1"` - `http_addr = "127.0.0.1"`
- remove the firewall allowed ports - remove the firewall allowed ports
This insures data will only flow via the nginx reverse proxy This insures data will only flow thru the nginx reverse proxy
Remember to set `networking.domain = "example.com"` to your domain. Remember to set `networking.domain = "example.com"` to your domain.