![]() Else you should probably put those behind an SSL enabled, password protected webserver (out of scope for this post). Note that enabling the admin-api and lifecycle will be allow anyone on your network to perform those functions, so you may want to only allow that if your network is trusted. If you want to run this behind a reverse proxy, then set web.external-url to the hostname and port (leave it off if you don’t). Pass in the path to any custom CA Certificate as a volume (example below) for any end points you require. We use host networking so that Prometheus can talk to localhost to monitor itself (not required if you want to configure Prometheus to talk to the host’s external IP instead of localhost). We’ll pass in the config directory we created earlier but also a dedicated volume so that the database is persistent across updates. cat << EOF | sudo tee /etc/prometheus.d/prometheus.yml As we will enable node-exporter on the monitoring node itself later, let’s add it as a localhost target. This file will set the scraping interval (under global) for Prometheus to pull data from client endpoints and is also where we configure those endpoints (under scrape_configs). Let’s create the core configuration file. Let’s create a directory for Prometheus configuration files which we will pass into the container. Sudo docker pull quay.io/prometheus/prometheus Install Docker and pull the image (I’ll use Quay instead of Dockerhub). You can either download the pre-compiled binary or run it in a container, I’ll do the latter. Prometheus is the trickiest to install, as there is no Yum repo available. I’m using CentOS 7 on a virtual machine, but this should be similar to other systems. Prometheus’ node exporter metrics in Grafana ![]() We can use agents like node-exporter to publish metrics on remote hosts which Prometheus will scrape, and other tools like collectd which can send metrics to InfluxDB’s collectd listener (as per my post about OpenWRT). ![]() Setting up these simple but powerful open source tools gives you a great base for monitoring and visualising your systems. Prometheus and InfluxDB are powerful time series database monitoring solutions, both of which are natively supported with graphing tool, Grafana.
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