- Download latest version of Prometheus from website and extract from archive, or just use script like this
PROME_VERSION="2.45.1" &&\
PROME_OS="darwin-amd64" &&\
PROME_FILE="prometheus-${PROME_VERSION}.${PROME_OS}.tar.gz" &&\
curl -L "https://github.com/prometheus/prometheus/releases/download/v${PROME_VERSION}/${PROME_FILE}" -o "/tmp/${PROME_FILE}" &&\
tar xvzf "/tmp/${PROME_FILE}" -C "/tmp"
- Create Prometheus config file
cat > /tmp/prometheus.yml <<EOF
global:
scrape_interval: 15s
external_labels:
monitor: 'codelab-monitor'
scrape_configs:
- job_name: 'test'
scrape_interval: 1s
static_configs:
- targets: ['localhost:3000']
EOF
- Run Prometheus passing config file using --config.file argument
/tmp/prometheus-2.45.1.darwin-amd64/prometheus --config.file=/tmp/prometheus.yml
- In our
prometheus.yamlwe have defined getting metrics from localhost:3000 . Let's create simple http server which hold metrics
cat > /tmp/index.js <<'EOF'
require('http').createServer(function (req, res) {
if (req.url === '/metrics') {
const metricName = 'foo';
const metricType = 'gauge';
const metricValue = 1;
res.writeHead(200, {'Content-Type': 'text/plain'});
res.write(`# TYPE ${metricName} ${metricType}\n`);
res.end(`${metricName} ${metricValue}\n`);
return;
}
res.writeHead(404, {'Content-Type': 'text/plain'});
res.end('Not found\n');
}).listen(3000, () => console.log(new Date(), 'Listening on port 3000'));
EOF
- Start server
node --watch /tmp/index.js
- Open Prometheus graph UI
open http://localhost:9090/graph
- Play with Prometheus 🎉
P.S.
Instead of handwritten server, you can use Pushgateway + curl
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