OpenFaaS Loki

A Loki powered log provider for OpenFaaS

OpenFaaS Loki implementes the new log provider interface from faas-provider. This means you can query Loki for your function logs with the faas-cli!

Limitations: This initial version does not support log tail streams. This means that faas-cli logs will alway behave as if --follow=false. Live tailing of the logs is currently being worked on.

All other OpenFaaS log behaviors should be fully supported. Issues are welcome if you notice a bug or room for improvement.

Install with Helm

1. Clone this repo
2. Determine the URL of your Loki installation, if you used the default Helm values to install Loki, this will be http://<service name>.<namespace>:3100
3. Then install the openfaas-loki provider using Helm:

   helm upgrade --install ofloki oci:://ghcr.io/lucasroesler/charts/openfaas-loki \
       --namespace openfaas \
       --set lokiURL=http://loki.monitoring:3100 \
       --set logLevel=DEBUG

4. Then update the gateway with the environment variable described in the NOTES output of the helm install. Currently, this can be done using

   kubectl -n openfaas set env deployment/gateway -c gateway -e logs_provider_url=http://ofloki-openfaas-loki.openfaas:9191/

   The environment variable is only needed on the gateway container.
5. Test the installation using

   faas-cli store deploy nodeinfo
   echo "" | faas-cli invoke nodeinfo
   faas-cli logs nodeinfo --tail=3

Development flow

OpenFaaS Loki is built with go 1.12+ and uses go modules and all of the development actions are currently defined through the Makefile

Run tests

make test

Local install

You can install using

make install

Check the installation using

openfaas-loki --version

Docker Build

Build the Docker image for amd64 archs and verify the build using

make image ARCH=linux/amd64 OWNER=lucasroesler REGISTRY=ghcr.io
docker run ghcr.io/lucasroesler/openfaas-loki:dev --version