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Blackbox Exporter ICMP module and selinux

Introduction Blackbox Exporter is an exporter for the Prometheus monitoring system. It is able to probe a target, such as a host or an application from the outside. Blackbox Exporter does probing with modules such as http, tcp, dns, icmp and grpc (details here). The icmp module is special because it does privileged operations that […]

Excluding down targets in Prometheus

Introduction Prometheus is an open source metrics and alerting solution used to monitor a wide range of things. Unlike many classic network monitoring systems Prometheus is focused on colleting metrics. This makes it quite easy to do things that would be difficult in others systems. For example excluding down targets in Prometheus is quite trivial. […]

Integrating Twilio SMS and Prometheus Alertmanager

Introduction Prometheus is a widely used, cloud-native open source monitoring solution. Its alerting component is called Alertmanager, which can send alerts to email, Slack and elsewhere. Both Prometheus and Alertmanager fit very well into the infrastructure as code model as well. Twilio SMS is a SMS sending service with consumption-based pricing model with an extensive […]

Testing AlertManager webhooks with curl

Introduction Prometheus is a Cloud-native metrics platforms that is very easy to manage with infrastructure as code tools. Prometheus is often couple with Alertmanager which handles alerting and alert routing. AlertManager has good support for various alert transport (e.g. email or slack) but its alerting capabilities can be extended with custom webhooks. When AlertManager is […]

Making Prometheus and Alertmanager work behind a reverse proxy

We maintain a Prometheus and Alertmanager setup where both services are running on the same host and an Apache reverse proxy handles TLS and authentication, authorization and single sign-on with Apache mod_auth_mellon configured as a Keycloak SAML client. This way we can limit access to Prometheus and Alertmanager to people who belong to a certain […]

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