Fabian Lee : Software Engineer

Prometheus: monitoring a custom Service using ServiceMonitor and PrometheusRule

July 7, 2022
Categories: Kubernetes, Monitoring

If you are running the Prometheus Operator as part of your monitoring stack (e.g. kube-prometheus-stack) then you can have your custom Service monitored by defining a ServiceMonitor CRD. The ServiceMonitor is an object that defines the service endpoints that should be scraped by Prometheus and at what interval. In this article, we will deploy a … Prometheus: monitoring a custom Service using ServiceMonitor and PrometheusRule

Ubuntu: Debug iptables by inserting a log rule

June 5, 2019
Categories: Linux

Iptables is a powerful utility for controlling network traffic coming through your host. But writing the rules that control the flow can be hard to troubleshoot when you have a complex network and multiple host interfaces. Luckily, you have the ability to insert log rules wherever necessary to get visibility into the packets flowing through … Ubuntu: Debug iptables by inserting a log rule

ELK: ElastAlert for alerting based on data from ElasticSearch

April 16, 2017
Categories: DevOps, Linux, Logging, Monitoring

ElasticSearch’s commercial X-Pack has alerting functionality based on ElasticSearch conditions, but there is also a strong open-source contender from Yelp’s Engineering group called ElastAlert. ElastAlert offers developers the ultimate control, with the ability to easily create new rules, alerts, and filters using all the power and libraries of Python.