Monitoring System Basics

First, the basic concept of monitoring system

1. Sensor

Data acquisition--data storage--presentation

Time Series data

Alarm: The collected data exceeds the threshold (Yu) value

2. Network Monitoring System

NMS Monitoring Node

3. SNMP (simple Network Management Protocol) Simple Network Management Protocol

1) operating mode of SNMP

NMS collects data from agent

Agent reports data to NMS

NMS Requests Agent to modify configuration

2) Components of SNMP

mib:management Information Base management information base

Define data specifications for the monitoring and monitoring side

Smi:mib symbol for the expression

SNMP protocol:

3) operations that the NMS can initiate

Get (Get Data), GetNext (get one or more data), set (set), Trap (captures the data reported by the monitored side),

4) Actions The agent can initiate: Response (report)

5) based on UDP protocol:

nms:161

agent:162

6) version of the SNMP protocol

V1: No Authentication function

V2C: Community-based (key) authentication #认证过程是明文的

V3: Authentication, encryption, decryption #使用的还很少

Second, open source monitoring tools

1, the realization of monitoring function

Dedicated Agent:

Ssh:

Snmp:

IPMI: (Intelligent Platform Management Interface) Smart Platform Management interface

An industry standard used by peripheral devices in an Intel-architected enterprise system. IPMI is also an open, free standard that users can use without paying an additional fee.

2, the famous Open source monitoring tool

Cacti (open pie)

Data collection and presentation,

Not sensitive to state transitions

The alarm function is weak: The alarm is not timely,

Nagios (Tears enough to think)

Powerful alarms: Alarm escalation, definition of maintenance windows, component dependencies,

not used in large-scale

focus on state transitions only, not collecting and presenting data

Zabbix (Ibis)

2.2 JSON

2.4 Communication mechanism optimization, save bandwidth 1/3

Monitoring System Basics