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Online courses

They are taught by the engineers who run these platforms every day, not by full-time instructors. That means examples taken from production — environments with tens of thousands of services — and honest answers to the awkward questions.

The Nagios ecosystem

The whole ecosystem, not just the install: Core, XI, Log Server, Network Analyzer and Fusion.

OnlineLive sessionsPrivate groups for your company
Modules

  1. Protocols and monitoring fundamentals

    The module the course opens with, and the one most often missing elsewhere. Before configuring a check you need to understand what you are asking and at which layer. We walk almost the full OSI model — see the table below — and practise with packet capture to see, live, what a device answers when Nagios asks.

  2. Nagios Core — the engine

    Internal architecture, the check execution cycle, configuration files, templates and inheritance, macros and environment variables. Understanding Core is what lets you debug XI when the interface is not enough.

  3. Nagios XI — daily operation

    Configuration wizards, users and permissions, dashboards by business area, availability and SLA reporting, the REST API, and the relationship between what the interface does and what it writes into Core.

  4. Active checks, passive checks and agents

    NRPE, NCPA and NSClient++ for agent-based checks; NSCA and SNMP traps for passive ones. When each fits, and why passive monitoring stops being optional in large environments.

  5. Thresholds, dependencies and noise

    How to set thresholds that do not produce useless alerts, how to model host and service dependencies so a single root failure does not fire hundreds of derived alerts, and how to revisit all of it as the estate grows.

  6. Nagios Log Server

    Centralizing syslog and Windows Event Log, indices and retention, search and correlation, alerting from the log, and its integration with XI.

  7. Nagios Network Analyzer

    NetFlow, sFlow, J-Flow and IPFIX: what each device exports, how it is collected, and how to read link consumption at flow level — the view XI checks do not give on their own.

  8. Nagios Fusion

    Aggregating several XI instances into a single view, for operations spread across sites or business units.

  9. Plugins and Nagios Exchange

    The bundled plugins, the community library, and how to write your own so it behaves: exit codes, performance data and timeouts.

  10. Sizing and tuning

    How much hardware an environment needs given hosts, services and check frequency; when distributing with workers becomes necessary; and how the platform behaves going from one thousand to ten thousand services.

VoIP infrastructure

From the SIP trunk to the call centre, on Asterisk, FreePBX and FreeSwitch.

OnlineLive sessionsPrivate groups for your company
Modules

  1. IP telephony fundamentals

    SIP and its signalling, RTP and the audio stream, codecs and bandwidth consumption, and why voice breaks differently from the way a website breaks.

  2. Asterisk, FreePBX and FreeSwitch

    What each platform solves, how they differ, and how to choose. FreePBX as an interface on top of Asterisk, and when FreeSwitch is the better call.

  3. Installation and dial plan

    Base PBX configuration on GNU/Linux, extensions, contexts, and building the dial plan step by step.

  4. Trunks and links

    SIP trunks, E1 links with Digium and Sangoma cards, inbound and outbound routes, and coexistence with the existing phone system.

  5. Business features

    IVR, voicemail with email delivery, call centre queues, call recording, remote extensions and per-department call accounting.

  6. Quality and troubleshooting

    QoS, jitter and packet loss; how to diagnose one-way audio, dropped calls and echo; and how to read a SIP capture instead of guessing.

  7. Continuity and monitoring

    PBX backup, trunk monitoring and link-failure alerts, integrated into Nagios if you already run it.

Inside the Nagios course

You monitor at almost every layer

Most monitoring courses teach you to fill in forms. This one starts a level below: which protocol answers at each layer of the OSI model, what its answer actually means, and why a service can be "up" at layer 4 and stone dead at layer 7.

Layer 1 · 2

Physical and data link

Port state and speed, duplex negotiation, CRC errors, interface saturation, temperature and power supplies.

SNMP
Layer 3

Network

Reachability, latency, packet loss, route changes and fragmentation.

ICMP · SNMP
Layer 4

Transport

TCP and UDP ports listening, full handshake, connection setup time, connections in wait states.

check_tcp · check_udp
Layer 5 · 6

Session and presentation

Active sessions, TLS certificate validity and chain, accepted cipher suites.

check_ssl_cert
Layer 7

Application

HTTP and HTTPS with content and status-code validation, DNS, SMTP, IMAP, LDAP, databases and queues.

HTTP · DNS · SMTP · SQL

On top of that come the protocols monitoring itself travels over: SNMP in its three versions and its traps, NRPE and NCPA for agent-based checks, NSCA for passive ones, syslog for logs and the NetFlow family for network flows.

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