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Updating with Docker is straight-forward. We just need to pull the (latest) image and then re-run our run-container.sh script.
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docker pull prom/prometheus ./run-container.sh |
Installing and configuring node_exporter (to monitor server stats)
node_exporter is a prometheus exporter which monitors hardware and 'nix OS metrics. It runs on a port exposed to prometheus and prometheus can then query it and get a (large) ranger of metrics for whatever machine is running node_exporter.
By default node_exporter enables a large number of "collectors" (modules which collect certain information from the machine). See here for a list of collectors enabled by default (and what info they collect).
node_exporter can be run from a docker container, but it's not recommended since it should be run directly on the host hardware to collect stats.
Installing node_exporter can be done by downloading a recent version version, untar'ing and executing. We're going to be doing an extra step here to manage node_exporter with systemd (so it starts on server boot etc.).
We start with downloading. You can find a link for the latest version at https://prometheus.io/download/#node_exporter. At the time of this writing the latest stable version for linux-amd64 was node_exporter-0.18.1.linux-amd64.tar.gz.
We'll download, untar, and then move it to /opt/node_exporter
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wget https://github.com/prometheus/node_exporter/releases/download/v0.18.1/node_exporter-0.18.1.linux-amd64.tar.gz
tar -xf node_exporter-0.18.1.linux-amd64.tar.gz
sudo mv node_exporter-0.18.1.linux-amd64 /opt/node_exporter |
With node_exporter installed let's make it easier to manage by creating a systemd service. Create a file in /etc/systemd/system/ with your favourite text editor (I'm using vim here):
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sudo vim /etc/systemd/system/node_exporter.service |
and paste the following:
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[Unit]
Description=Node Exporter
Wants=network-online.target
After=network-online.target
[Service]
Type=simple
ExecStart=/opt/node_exporter --web.listen-address=:10091
[Install]
WantedBy=multi-user.target |
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I'm using a non-default port here (10091) so change it to whatever port you prefer (or have free). |
Finally let's enable it (to start on boot) and start the service
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sudo systemctl daemon-reload
sudo systemctl enable --now node_exporter |
Installing and configuring blackbox (to monitor endpoints)
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References
- https://prometheus.io/
- https://github.com/prometheus/node_exporter
- https://prometheus.io/download/#node_exporter
- https://grafana.com/
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