PROMETHEUS AND GRAFANA

USING PROMETHEUS & GRAFANA TO SEE SERVER UTILIZATION STATUS

INTRODUCTION OF PROMETHEUS:-

Prometheus is a leading monitoring solution that has seen its community grow to a large number. The support for multiple exporters is one of the strongest points of Prometheus since it can help you get started with specific monitoring requirements quickly. Prometheus is a leading open source monitoring and alert tool. Since its announcement in 2015, it has been a significant adoption. It originated at SoundCloud and was created because of the need to monitor multiple microservices that might be running in your system. With a modular architecture and availability of modules referred to as exporters, it can capture metrics from the most popular software. Written in the Go language and shipping with easily distributed binaries, Prometheus can be run as quickly as possible.

INTRODUCTION OF GRAFANA

Grafana is a beautiful dashboard for displaying various Graphic metrics through a web browser.  It has a simple set up and easy to maintain. Also, it has a nice Kabana-like display to display metrics and is also easy to use. 

I would like to walk readers through the basics of this tool because although it is a very new project it has an enormous amount of potential. 

One very nice feature of this product offering is that you do not need to worry about any of the behind the scene detail or intricacies of how all of the Graphite components work together.  You can find out with just a few clicks.  Highly recommended if you just need something that works.

Also Read: Setting Up Kibana For ElasticSearch

PROMETHEUS -- PROS & CONS 

GRAFANA -- PROS & CONS 

Also Read: Monitoring Using Prometheus and Grafana Stack

LET'S DOWNLOAD AND INSTALL PROMETHEUS & GRAFANA

sudo useradd --no-create-home --shell /bin/false prometheus
sudo useradd --no-create-home --shell /bin/false node_exporter

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

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

Step 2 — Downloading Prometheus

cd ~
curl -LO https://github.com/prometheus/prometheus/releases/download/v2.0.0/prometheus-2.0.0.linux-amd64.tar.gz

sudo cp prometheus-2.0.0.linux-amd64/prometheus /usr/local/bin/
sudo cp prometheus-2.0.0.linux-amd64/promtool /usr/local/bin/

sudo chown prometheus:prometheus /usr/local/bin/prometheus
sudo chown prometheus:prometheus /usr/local/bin/promtool

sudo cp -r prometheus-2.0.0.linux-amd64/consoles /etc/prometheus
sudo cp -r prometheus-2.0.0.linux-amd64/console_libraries /etc/prometheus

sudo chown -R prometheus:prometheus /etc/prometheus/consoles
sudo chown -R prometheus:prometheus /etc/prometheus/console_libraries

rm -rf prometheus-2.0.0.linux-amd64.tar.gz prometheus-2.0.0.linux-amd64

Step 3 — Configuring Prometheus

sudo nano /etc/prometheus/prometheus.yml

...
scrape_configs:
  - job_name: 'prometheus'
    scrape_interval: 5s
    static_configs:
      - targets: ['localhost:9090']

global:
  scrape_interval: 15s

scrape_configs:
  - job_name: 'prometheus'
    scrape_interval: 5s
    static_configs:
      - targets: ['localhost:9090']

sudo chown prometheus:prometheus /etc/prometheus/prometheus.yml

Step 4 — Running Prometheus

sudo -u prometheus /usr/local/bin/prometheus \
--config.file /etc/prometheus/prometheus.yml \
--storage.tsdb.path /var/lib/prometheus/ \
--web.console.templates=/etc/prometheus/consoles \
--web.console.libraries=/etc/prometheus/console_libraries

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

[Unit]
Description=Prometheus
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.console.templates=/etc/prometheus/consoles \
    --web.console.libraries=/etc/prometheus/console_libraries

sudo systemctl daemon-reload
sudo systemctl start prometheus
sudo systemctl status prometheus

cd ~
curl -LO https://github.com/prometheus/node_exporter/releases/download/v0.15.1/node_exporter-0.15.1.linux-amd64.tar.gz

sudo cp node_exporter-0.15.1.linux-amd64/node_exporter /usr/local/bin
sudo chown node_exporter:node_exporter /usr/local/bin/node_exporter

rm -rf node_exporter-0.15.1.linux-amd64.tar.gz node_exporter-0.15.1.linux-amd64

Step 6 — Running Node Exporter

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

[Unit]
Description=Node Exporter
Wants=network-online.target
After=network-online.target

[Service]
User=node_exporter
Group=node_exporter
Type=simple
ExecStart=/usr/local/bin/node_exporter

[Install]
WantedBy=multi-user.target

sudo systemctl daemon-reload

sudo systemctl start node_exporter

sudo systemctl status node_exporter

sudo systemctl enable node_exporter

Step 7 — Configuring Prometheus Node Exporter

sudo nano /etc/prometheus/prometheus.yml

Prometheus config file part 1 - /etc/prometheus/prometheus.yml

...
  - job_name: 'node_exporter'
    scrape_interval: 5s
    static_configs:
      - targets: ['localhost:9100']

Prometheus config file - /etc/prometheus/prometheus.yml

global:
  scrape_interval: 15s

scrape_configs:
  - job_name: 'prometheus'
    scrape_interval: 5s
    static_configs:
      - targets: ['localhost:9090']
  - job_name: 'node_exporter'
    scrape_interval: 5s
    static_configs:
      - targets: ['localhost:9100']

sudo systemctl restart prometheus

sudo systemctl status prometheus

sudo apt-get update
sudo apt-get install apache2-utils

sudo htpasswd -c /etc/nginx/.htpasswd sammy

sudo cp /etc/nginx/sites-available/default /etc/nginx/sites-available/prometheus

sudo nano /etc/nginx/sites-available/prometheus

/etc/nginx/sites-available/default

...
    location / {
        try_files $uri $uri/ =404;
    }
...
Copy

/etc/nginx/sites-available/prometheus

...
    location / {
        auth_basic "Prometheus server authentication";
        auth_basic_user_file /etc/nginx/.htpasswd;
        proxy_pass http://localhost:9090;
        proxy_http_version 1.1;
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection 'upgrade';
        proxy_set_header Host $host;
        proxy_cache_bypass $http_upgrade;
    }
...
Copy

sudo rm /etc/nginx/sites-enabled/default
sudo ln -s /etc/nginx/sites-available/prometheus /etc/nginx/sites-enabled/

sudo nginx -t

sudo systemctl reload nginx

sudo systemctl status nginx
 

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