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InstallPrometheus.md

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Prometheus Installation and Configuration

Verify available versions

sudo apt-cache policy prometheus

Create Prometheus user

sudo useradd -M -r -s /bin/false prometheus

Create Prometheus directories

sudo mkdir /etc/prometheus /var/lib/prometheus

Download binaries

wget https://github.com/prometheus/prometheus/releases/download/v3.1.0/prometheus-3.1.0.linux-amd64.tar.gz

Extract and Install

tar xzf prometheus-3.1.0.linux-amd64.tar.gz  
sudo cp prometheus-3.1.0.linux-amd64/{prometheus,promtool} /usr/local/bin/  
sudo chown prometheus:prometheus /usr/local/bin/{prometheus,promtool}

Setup Prometheus configuration

sudo cp prometheus-3.1.0.linux-amd64/prometheus.yml /etc/prometheus/prometheus.yml  
sudo nano /etc/prometheus/prometheus.yml

Configuration section for scraping

    static_configs:  
    - targets: ['localhost:9091']  
  
  - job_name: 'Walrus-Node'  
    static_configs:  
      - targets: ['localhost:9184']  
        labels:  
          group: 'WalrusNode'  

  - job_name: 'Walrus-Aggregator'
    static_configs:
      - targets: ['localhost:27182']
        labels:
          group: 'WalrusAggregator'

  - job_name: 'Walrus-Publisher'
    static_configs:
      - targets: ['localhost:27183']
        labels:
          group: 'WalrusPublisher'

  - job_name: node  
    static_configs:  
      - targets: ['localhost:9100']

The ports 9184, 27182, 27183 for the Walrus Storage Node, Walrus Publisher and Walrus Aggregator are just examples and have to be changed accordingly to the ports your services are exposing metrics. The same applies to the node or Prometheus port or host ("localhost") — they can be adapted as needed.

Set the user and group ownership on the configuration file

sudo chown -R prometheus:prometheus /etc/prometheus  
sudo chown prometheus:prometheus /var/lib/prometheus

Create a systemd file for Prometheus - in this scenario Prometheus uses 9091 as listen port

sudo nano /etc/systemd/system/prometheus.service

Now copy the section below:

[Unit]  
Description=Prometheus Time Series Collection and Processing Server  
Wants=network-online.target  
After=network-online.target  
  
[Service]  
User=prometheus  
Group=prometheus  
Type=simple  
ExecStart=/usr/local/bin/prometheus \  
    --config.file /etc/prometheus/prometheus.yml \  
    --storage.tsdb.path /var/lib/prometheus/ \
    --web.listen-address="0.0.0.0:9091"  
  
[Install]  
WantedBy=multi-user.target

Enable Prometheus at startup

sudo systemctl enable prometheus

Start Prometheus service

sudo systemctl start prometheus

Check the status of the Prometheus service

sudo systemctl status prometheus