Install Zabbix 7.0 LTS in Docker Alongside Grafana
Two monitoring platforms, one Ubuntu box, zero port collisions. Plus the built-in host that cannot reach its own agent, and why apt was not an option.
Monitoring
Knowing something broke before the tickets arrive. Articles tagged Monitoring cover SNMP, syslog, NetFlow, IP SLA and what is worth alerting on.
Latest posts
How to Install Grafana Enterprise on Ubuntu Server
From an empty Ubuntu box to a Grafana login screen: APT repo, systemd, and the 20-second gotcha that makes people think the install failed.
iftop, nload, bmon, vnstat, nethogs Compared
Five live bandwidth monitors pointed at the same flow at the same time, with real terminal frames and a reconciliation of why they all report different numbers.
mtr: Continuous Path Monitoring on Linux
Loss and latency per hop against a link with 12 percent loss injected on purpose, and the one rule that separates real loss from cosmetic loss.
PTP vs NTP: When Microseconds Matter
NTP keeps most networks within a second; trading floors, 5G fronthaul, and substations need microseconds. This article explains the structural limit that makes NTP incapable of that job and how PTP (IEEE 1588) solves it.
SPAN, RSPAN, and ERSPAN: Packet Mirroring on Cisco Switches
SPAN, RSPAN, and ERSPAN configured on real Cisco gear, with the ERSPAN packets captured arriving at a real Linux host. Three ways to mirror traffic to Wireshark, separated by how far the analyzer sits from the traffic.
IP SLA on Cisco IOS XE: Probes, Thresholds, and Tracked Failover
IP SLA answers "is this path usable," which is not the same question as "is this link up." Captured on CML with IOS XE 17.18.2: ICMP and jitter probes against a deliberately degraded link, then a full tracked failover with the SLA timing out, %TRACK-6-STATE logging the object down, and the...
NetFlow v5 vs v9 vs Flexible NetFlow vs IPFIX
NetFlow v5, v9, Flexible NetFlow, and IPFIX do the same job differently. This comparison shows which fields, templates, and transport each supports so you pick the one your collector and your data actually need.
Flexible NetFlow on Cisco IOS XE: Records, Monitors, and Exporters
Flexible NetFlow tells you who is making the link busy, talking to what, on which port. Build the record, monitor, and exporter on Cisco IOS XE, export flows to a real Linux collector, and decode them so you see the data arrive.