observability.svc.plus/roles/node_monitor

Role: node_monitor

Setup Node Monitoring Exporters and Register to Infra

Module	NODE
Docs	https://pigsty.io/docs/node/monitor
Related Roles	node, node_id, node_remove, infra

Overview

The node_monitor role sets up monitoring components for Linux nodes:

• node_exporter: Collects system metrics (port 9100)
• keepalived_exporter: Collects VIP metrics (port 9650, when VIP enabled)
• vector: Log collection agent (define sinks, collect syslog)

It also registers the node to infrastructure monitoring:

• Victoria Metrics: Register as scrape targets
• HAProxy: Register to Nginx reverse proxy

Playbooks

Playbook	Description
node.yml	Full node provisioning (includes monitoring)

File Structure

roles/node_monitor/
├── defaults/
│   └── main.yml                  # Default variables
├── files/
│   ├── node_exporter.svc         # node_exporter systemd service
│   └── keepalived_exporter.svc   # keepalived_exporter systemd service
├── meta/
│   └── main.yml                  # Role dependencies
├── tasks/
│   ├── main.yml                  # Entry point
│   └── vector.yml                # Vector configuration
└── templates/
    ├── vector.toml.j2            # Vector configuration
    └── node.yaml                 # Vector node log config

Tags

Tag Hierarchy

node_monitor (from node.yml)
│
├── haproxy_register               # Register HAProxy to Nginx
│
├── vip_dns                        # Register VIP DNS name
│
├── node_exporter                  # node_exporter setup
│   ├── node_exporter_config       # Generate config
│   └── node_exporter_launch       # Start service
│
├── vip_exporter                   # keepalived_exporter (when VIP enabled)
│   ├── vip_exporter_config        # Generate config
│   └── vip_exporter_launch        # Start service
│
├── node_register                  # Register to monitoring
│   └── add_metrics                # Register to Victoria Metrics
│
└── vector                         # Vector log agent
    ├── vector_config              # Generate config
    └── vector_launch              # Start service

Key Variables

node_exporter

Variable	Default	Description
node_exporter_enabled	true	Enable node_exporter
node_exporter_port	9100	Listen port
node_exporter_options	(see below)	Extra CLI options

Default Options:

--no-collector.softnet --no-collector.nvme --collector.tcpstat --collector.processes

These defaults disable noisy/problematic collectors (softnet, nvme) while enabling useful ones (tcpstat for TCP connection stats, processes for process metrics).

keepalived_exporter

Variable	Default	Description
vip_enabled	false	Enable VIP and exporter
vip_exporter_port	9650	Listen port

Vector

Variable	Default	Description
vector_enabled	true	Enable vector log agent
vector_port	9598	Metrics port
vector_data	/data/vector	Data directory
vector_clean	false	Purge data dir during init
vector_read_from	beginning	Read from beginning or end
vector_log_endpoint	[ infra ]	Log destination (see below)

Log Endpoint Configuration (vector_log_endpoint):

Value	Behavior
[ infra ]	Auto-discover Victoria Logs on infra nodes (default)
[ "http://host:9428/..." ]	Send to explicit Victoria Logs endpoint
[] (empty)	Disable log forwarding, only collect metrics

Note

: Vector uses current_boot_only: true, meaning only logs since the last system boot are collected. Historical logs are not re-ingested on restart to avoid duplicates.

HAProxy

Variable	Default	Description
haproxy_enabled	true	Enable HAProxy
haproxy_exporter_port	9101	HAProxy metrics port

Exporter Ports

Exporter	Default Port	Description
node_exporter	9100	System metrics
haproxy_exporter	9101	HAProxy metrics
vector	9598	Vector metrics
keepalived_exporter	9650	VIP/Keepalived metrics

Registered Targets

Victoria Metrics

Creates target files at /infra/targets/node/<ip>.yml:

- labels: { ip: 10.10.10.11, ins: pg-test-1, host: pg-test-host, cls: pg-test }
  targets:
    - 10.10.10.11:9100    # node_exporter
    - 10.10.10.11:9101    # haproxy_exporter
    - 10.10.10.11:9598    # vector

Ping Targets

Creates ping targets at /infra/targets/ping/<ip>.yml for ICMP monitoring.

Log Collection Architecture

Vector collects logs from journald and forwards them to Victoria Logs:

┌─────────────┐     ┌─────────────┐     ┌─────────────────┐
│   journald  │ ──► │   Vector    │ ──► │ Victoria Logs   │
│  (syslog)   │     │  (agent)    │     │ (infra nodes)   │
└─────────────┘     └─────────────┘     └─────────────────┘

Log Fields Collected:

Field	Description
_time	Timestamp in RFC3339 format
message	Log message content
app	Application identifier (SYSLOG_IDENTIFIER)
unit	Systemd unit name (without .service)
pid	Process ID
level	Syslog level (info, warn, err, etc.)
ip	Node IP address
ins	Node instance name (nodename)
cls	Node cluster name (node_cluster)
job	Log job identifier (syslog)

See Also

• node: Node provisioning
• node_remove: Remove node components
• infra: Infrastructure monitoring stack