Logs Overview

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How Log Monitoring Works

Glouton embeds a log processing pipeline based on the OpenTelemetry Collector. It collects logs from multiple sources, processes them with operators and filters, and exports them to the Bleemeo Cloud Platform where they can be browsed and analyzed.

Log Sources

Glouton supports the following log sources:

Source	Description	Details
Container logs	Automatic collection from Docker and Kubernetes containers	Container Logs
Service logs	Automatic detection and collection from known services (Nginx, PostgreSQL, Redis, etc.)	Service Logs
System logs	System logs via systemd-journald, syslog, or Auditd	System Logs
File logs	Read log files using glob patterns	File Logs
OTLP receivers	Receive logs via OTLP gRPC (port 4317) or HTTP (port 4318)	OTLP Receivers

Enabling Log Processing

Log collection is enabled by default (log.opentelemetry.enable: true), but automatic discovery of log sources requires additional settings.

The simplest way is to use all_enable which enables all log sources at once (containers, services, systemd-journald, syslog, and Auditd).

For more control, you can enable each source individually. The example below enables container and service logs along with systemd-journald system logs:

Linux Package

sudo tee /etc/glouton/conf.d/99-logs.conf > /dev/null << 'EOF'
log.opentelemetry.auto_discovery.container_and_service_enable: true
log.opentelemetry.auto_discovery.journald_enable: true
EOF

sudo systemctl restart glouton

This tells Glouton to automatically detect running services (Nginx, PostgreSQL, Redis, etc.) and start collecting their logs along with systemd-journald system logs.

Docker

When running Glouton as a Docker container, pass the settings as environment variables:

docker run -d --restart=unless-stopped --name glouton \
  -v /var/run/docker.sock:/var/run/docker.sock:ro \
  -v /:/hostroot:ro \
  -e GLOUTON_LOG_OPENTELEMETRY_AUTO_DISCOVERY_CONTAINER_AND_SERVICE_ENABLE=true \
  -e GLOUTON_LOG_OPENTELEMETRY_AUTO_DISCOVERY_JOURNALD_ENABLE=true \
  bleemeo/bleemeo-agent

Or, using a configuration file mounted into the container:

sudo mkdir -p /etc/glouton/conf.d
sudo tee /etc/glouton/conf.d/99-logs.conf > /dev/null << 'EOF'
log.opentelemetry.auto_discovery.container_and_service_enable: true
log.opentelemetry.auto_discovery.journald_enable: true
EOF

docker run -d --restart=unless-stopped --name glouton \
  -v /var/run/docker.sock:/var/run/docker.sock:ro \
  -v /:/hostroot:ro \
  -v /etc/glouton/conf.d/:/etc/glouton/conf.d/:ro \
  bleemeo/bleemeo-agent

Once enabled, logs from containers, discovered services, and the system journal are automatically gathered and sent to the Bleemeo Cloud Platform.

Note

By default, all discovered logs are processed. To limit which container logs are collected, use the glouton.log_enable label or filters.

Next Steps

• Container Logs — automatic Docker and Kubernetes log collection
• Service Logs — automatic detection of known services
• System Logs — systemd-journald, syslog, and Auditd logs
• File Logs — collect logs from files with operators and filters
• OTLP Receivers — receive logs via gRPC or HTTP
• Log Formats & Filters — built-in formats and filter reference
• Log Metrics (Legacy) — generate metrics from logs using Fluent Bit