Log aggregation for Kubernetes cluster

Deploy Loki stack:

$ helm repo add loki https://grafana.github.io/loki/charts
$ helm repo update
$ helm upgrade --install --namespace default loki -f logs/loki/loki-values.yaml loki/loki
$ helm upgrade --install --namespace default promtail -f logs/loki/promtail-values.yaml loki/promtail --set "loki.serviceName=loki"

Loki in Grafana

You should add the Loki data source to Grafana configuration.

1. In Grafana, go to Configuration > Data Sources
2. Go to Add data source
3. Choose Loki --> The http URL field http://loki:3100

Querying logs from Loki on Grafana

1. Explore > Choose ‘Loki’ data source
2. Enter a Liki query. E.g., {app="zookeeper",namespace="bigtop"}
3. You can see the log streams from Zookeeper Pods on Kubernetes cluster