Dustin
45c35c065a
[Promtail][0] is the log collection agent for Grafana Loki. It reads logs from various locations, including local files and the _systemd_ journal and sends them to Loki via HTTP. Loki configuration is a highly-structured YAML document. Thus, instead of using Tera template syntax for loops, conditionals, etc., we can use the full power of CUE to construct the configuration. Using the `Marshal` function from the built-in `encoding/yaml` package, we serialize the final configuration structure as a string and write it verbatim to the configuration file. I have modeled most of the Promtail configuration schema in the `du5t1n.me/cfg/app/promtail/schema` package. Having the schema modeled will ensure the generated configuration is valid during development (i.e. `cue export` will fail if it is not), which will save time pushing changes to machines and having Loki complain. The `#promtail` "function" in `du5t1n.me/cfg/env/prod` makes it easy to build our desired configuration. It accepts an optional `#scrape` field, which can be used to provide specific log scraping definitions. If it is unspecified, the default configuration is to scrape the systemd journal. Hosts with additional needs can supply their own list, probably including the `promtail.scrape.journal` object in it to get the default journal scrape job. [0]: https://grafana.com/docs/loki/latest/send-data/promtail/ |
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| app | ||
| base/schema/instructions | ||
| cue.mod | ||
| env | ||
| host | ||
| instructions | ||
| scripts | ||
| templates | ||
| .editorconfig | ||
| .gitignore | ||
| config.sh | ||