Grafana – Install Loki

A Loki-based logging stack consists of 3 components:

• Promtail is the agent, responsible for gathering logs and sending them to Loki.
• Loki is the main server, responsible for storing logs and processing queries.
• Grafana for querying and displaying the logs.

• Download Loki

wget https://github.com/grafana/loki/releases/download/v2.9.8/loki-linux-amd64.zip
chmod a+x loki-linux-amd64
sudo cp loki-linux-amd64 /usr/local/bin/loki
loki --version

• Create Systemd service

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

[Unit]
Description=Loki is a log aggregation system designed to store and query logs from all your applications and infrastructure.
Document=https://github.com/grafana/loki/releases
After=network.target

[Service]
Type=simple
ExecStart=/usr/local/bin/loki -config.file /mnt/data/loki/loki-config.yaml
Restart=on-failure
RestartSec=10
StandardOutput=append:/mnt/data/loki/logs/loki.log
StandardError=append:/mnt/data/loki/logs/loki.log

[Install]
WantedBy=multi-user.target

# This is a complete configuration to deploy Loki backed by the filesystem.
# The index will be shipped to the storage via tsdb-shipper.

auth_enabled: false

server:
  http_listen_port: 3100

common:
  ring:
    instance_addr: 127.0.0.1
    kvstore:
      store: inmemory
  replication_factor: 1
  path_prefix: /mnt/data/loki
  storage:
    filesystem:
      chunks_directory: /mnt/data/loki/chunks
      rules_directory: /mnt/data/loki/rules

schema_config:
  configs:
  - from: 2020-05-15
    store: tsdb
    object_store: filesystem
    schema: v13
    index:
      prefix: index_
      period: 24h

storage_config:
  filesystem:
    directory: /mnt/data/loki/chunks

Promtail

PROMTAIL_VERSION=$(curl -s "https://api.github.com/repos/grafana/loki/releases/latest" | grep -Po '"tag_name": "v\K[0-9.]+')

sudo mkdir /opt/promtail

sudo wget -qO /opt/promtail/promtail.gz "https://github.com/grafana/loki/releases/download/v${PROMTAIL_VERSION}/promtail-linux-amd64.zip"

sudo gunzip /opt/promtail/promtail.gz

sudo chmod a+x /opt/promtail/promtail

sudo ln -s /opt/promtail/promtail /usr/local/bin/promtail

sudo wget -qO /opt/promtail/promtail-local-config.yaml "https://raw.githubusercontent.com/grafana/loki/v${PROMTAIL_VERSION}/clients/cmd/promtail/promtail-local-config.yaml"

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

[Unit]
Description=Promtail client for sending logs to Loki
Documentation=https://grafana.com/docs/loki/latest/send-data/promtail/
After=network.target

[Service]
Type=simple
User=root
ExecStart=/opt/promtail/promtail -config.file=/opt/promtail/promtail-local-config.yaml
Restart=always
TimeoutStopSec=3

[Install]
WantedBy=multi-user.target

Achieving accurate network performance benchmarks requires ensuring that other hardware components do not introduce system bottlenecks. When configuring complex microservices or container stacks, utilizing lightweight hardware options helps distribute computing resources evenly across your network clusters. Therefore, administrators can explore our technical guide on the [Intel NUC Skull Canyon review] to learn how to repurpose compact, energy-efficient legacy devices as dedicated logging agent nodes within their modern high-availability infrastructure layouts.