install-promtail.yml

#!/bin/bash

echo "🚀 Starting Promtail installation..."

# Check and install unzip if not exists
if ! command -v unzip &> /dev/null; then
  echo "🛠 Installing unzip..."
  sudo apt update
  sudo apt install -y unzip
fi

# Fetch system hostname
HOSTNAME=$(hostname)

# Download Promtail binary
wget https://github.com/grafana/loki/releases/download/v2.4.1/promtail-linux-amd64.zip -O promtail.zip

# Unzip and move to /usr/local/bin
unzip promtail.zip
chmod a+x promtail-linux-amd64
sudo mv promtail-linux-amd64 /usr/local/bin/promtail

# Create system user and group
sudo addgroup --system promtail
sudo adduser --system --ingroup promtail promtail

# Create config file
mkdir -p /etc/promtail
cat <<EOL > /etc/promtail/promtail-config.yaml
server:
  http_listen_port: 9080
  grpc_listen_port: 0

positions:
  filename: /tmp/positions.yaml

clients:
  - url: http://127.0.0.1:3100/loki/api/v1/push

scrape_configs:
  - job_name: journal
    journal:
      max_age: 12h
      labels:
        job: systemd-journal
        host: $HOSTNAME
    relabel_configs:
      - source_labels: ['__journal__systemd_unit']
        target_label: 'unit'
EOL

# Adjust permissions
sudo chown -R promtail:promtail /etc/promtail

# Create systemd service
cat <<EOL > /etc/systemd/system/promtail.service
[Unit]
Description=Promtail service
After=network.target

[Service]
User=promtail
Group=promtail
ExecStart=/usr/local/bin/promtail -config.file /etc/promtail/promtail-config.yaml

[Install]
WantedBy=multi-user.target
EOL

# Reload systemd and start Promtail service
sudo systemctl daemon-reload
sudo systemctl enable promtail
sudo systemctl start promtail

echo "🎉 Promtail installation complete!"