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[infra] Mention that logging to stdout is a good default for services

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Manav Rathi 2024-03-20 11:28:40 +05:30
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infra/services/README.md
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@ -95,10 +95,19 @@ sudo journalctl --follow --unit example
## Logging
Services should log to files in `/var/logs` within the container. This should be
mounted to `/root/var/logs` on the instance (using the `-v` flag in the service
file which launches the Docker container or the Docker compose cluster).
Simple services can log to their standard output: these are captured by Docker,
and by default promtail is setup to injest Docker logs and send them to Grafana.
If these logs need to be sent to Grafana, then ensure that there is an entry for
this log file in the `promtail/promtail.yaml` on that instance. The logs will
then get scraped by Promtail and sent over to Grafana.
One issue with the above simple setup is that we cannot attach job names.
If the service needs to to attach a specific job name, or if the service wants
more control over the log retention etc, then then services can log to to its
own files.
* Such files should be in `/var/logs` within the container, and this should be
mounted to `/root/var/logs` on the instance (using the `-v` flag in the
service file which launches the Docker container or the Docker compose cluster).
* There should be entry for this log file in the `promtail/promtail.yaml` on
that instance. The logs will then get scraped by Promtail and sent over to
Grafana.