# Create Instances for Prometheus Server and Grafana

# Download Prometheus Server
```
cd /tmp
wget -c https://github.com/prometheus/prometheus/releases/download/v2.13.1/prometheus-2.13.1.linux-amd64.tar.gz
```

# Extract Prometheus Server
```
tar zxvf prometheus-2.13.1.linux-amd64.tar.gz
```
# Move to some directory
```
mv prometheus-2.13.1.linux-amd64 /opt/prometheus-server
cd /opt/prometheus-server
```
# Edit configuration file
```
vim config.yml
```
```
# my global config
 
global:
  scrape_interval:     15s # Set the scrape interval to every 15 seconds. Default is every 1 minute.
  evaluation_interval: 15s # Evaluate rules every 15 seconds. The default is every 1 minute.
  # scrape_timeout is set to the global default (10s).
 
# Alertmanager configuration
alerting:
  alertmanagers:
  - static_configs:
    - targets:
      # - alertmanager:9093
 
# Load rules once and periodically evaluate them according to the global 'evaluation_interval'.
rule_files:
  # - "first_rules.yml"
  # - "second_rules.yml"
 
# A scrape configuration containing exactly one endpoint to scrape:
# Here it's Prometheus itself.
scrape_configs:
  # The job name is added as a label `job=` to any timeseries scraped from this config.
  - job_name: 'prometheus'
    static_configs:
    - targets: ['localhost:9090']
  - job_name: 'openstack-sd'
    openstack_sd_configs:
      - identity_endpoint: https://keystone-url:5000/v3
        username: username
        project_id: projectid
        password: password
        role: instance 
        region: region-name
        domain_name: domain-name
        port: 9100
```

# Configure Systemd Service for Prometheus Service

vim /etc/systemd/system/prometheus-server.service

``` 
[Unit]
Description=Prometheus Server
 
[Service]
User=root
ExecStart=/opt/prometheus-server/prometheus --config.file=/opt/prometheus-server/config.yml --web.external-url=http://ip-server:9090/
 
[Install]
WantedBy=default.target
```

# Running Service
```
systemctl daemon-reload
systemctl enable prometheus-server.service
systemctl start prometheus-server.service
```

# Verification Service
```
systemctl status prometheus-server.service
ss -tulpn |grep 9090
```

# Install Grafana
```
cd /tmp
wget -c https://dl.grafana.com/oss/release/grafana_6.4.3_amd64.deb
dpkg -i grafana_6.4.3_amd64.deb
```

# Running Service
```
systemctl daemon-reload
systemctl start grafana-server
systemctl enable grafana-server
```

# Verification
```
systemctl status grafana-server
ss -tulpn | grep 3000
```

# Configura Datasource and Dashboard on Grafana

- Login to Grafana 
- Add data source
- Choose Prometheus
```
Name: Prometheus
Http settings
URL: http://localhost:9090
```
- Save and Test
- Add Dashboard


# Create new instance with node exporter

# Install node-exporter on ubuntu instances
```
cd /tmp/
wget -c https://github.com/prometheus/node_exporter/releases/download/v0.18.1/node_exporter-0.18.1.linux-amd64.tar.gz
tar zxvf node_exporter-0.18.1.linux-amd64.tar.gz 
mv node_exporter-0.18.1.linux-amd64 /opt/node_exporter
```

# Create systemd service and running node-exporter
```
cat << EOF >/etc/systemd/system/node_exporter.service
[Unit]
Description=Node Exporter
 
[Service]
User=root
ExecStart=/opt/node_exporter/node_exporter
 
[Install]
WantedBy=default.target
EOF
 
systemctl daemon-reload
systemctl enable node_exporter.service
systemctl start node_exporter.service
systemctl status node_exporter.service
```