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Does anyone know how to configure Promtail to watch and tail custom log paths in a Kubernetes pod? I have a deployment that creates customized log files in a directory like so /var/log/myapp. I found some documentation here that says to deploy Promtail as a sidecar to the container you want to collect logs from. I was hoping someone could explain how this method works in practice. Does it need to be done as a sidecar or could it be done as a Daemonset? Or if you have alternative solution that has proven to work could please show me an example.

FestiveHydra235
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  • you can find useful Medium article with an example of Sidecar: https://medium.com/bb-tutorials-and-thoughts/kubernetes-learn-sidecar-container-pattern-6d8c21f873d – Bazhikov Oct 27 '21 at 13:55
  • @WytrzymałyWiktor I found this helm chart to be useful in getting it to work: https://github.com/giantswarm/simple-logger – FestiveHydra235 Nov 03 '21 at 13:39

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Posting comment as the community wiki answer for better visibility:

Below information is taken from README.md from the GitHun repo provided by atlee19:

This docs assume:

  • you have loki and grafana already deployed. Please refered to official documentation for installation

  • The logfile you want to scrape is in JSON format

This Helm chart deploy a application pod with 2 containers: - a Golang app writing logs in a separate file. - a Promtail that read that log file and send it to loki.

The file path can be updated via the ./helm/values.yaml file.

sidecar.labels is a map where you can add the labels that will be added to your log entry in Loki.

Example:

  • Logfile located at /home/slog/creator.log
  • Adding labels
    • job: promtail-sidecar
    • test: golang
sidecar:
  logfile:
    path: /home/slog
    filename: creator.log
  labels:
    job: promtail-sidecar
    test: golang
Bazhikov
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