The document discusses the importance of observability for load balancers like HAProxy. It defines observability as the ability to infer the internal state of a system from external outputs. The load balancer acts as an observation tower that sees metrics from multiple targets, allowing comparisons to detect issues. HAProxy provides logs and statistics that can be used for observability to detect
FastNetMon analyses live network traffic to detect DDoS attacks in near real time and triggers mitigation actions based on operator-defined rules and workflows. Engineers can use FastNetMon to initiate responses via BGP FlowSpec, RTBH, or redirect traffic to external scrubbing centres, while retaining full control over how, when, and where mitigation is applied within their network. Analyse live t
chrony is a versatile implementation of the Network Time Protocol (NTP). It can synchronise the system clock with NTP servers, reference clocks (e.g. GPS receiver), and manual input using wristwatch and keyboard. It can also operate as an NTPv4 (RFC 5905) server and peer to provide a time service to other computers in the network. It is designed to perform well in a wide range of conditions, inclu
Atop is an ASCII full-screen performance monitor for Linux that is capable of reporting the activity of all processes (even if processes have finished during the interval), daily logging of system and process activity for long-term analysis, highlighting overloaded system resources by using colors, etc. At regular intervals, it shows system-level activity related to the CPU, memory, swap, disks (i
Copyright 2002-2005 Lennart Poettering <mzvscyhtq (at) 0pointer (dot) de> License News Overview Current Status Documentation Requirements Installation Acknowledgements Download License This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your op
cacti(カクタイ)とは、サボテンという意味のグラフツール cacti(カクチ)とは、サボテンという意味のグラフツール 読み方を間違っていた MRTGの代替ツール † グラフツールというとMRTG*1が有名ですね。cacti*2もMRTGと同じように、SNMPエージェントが取得した値や、プログラム/スクリプトの出力結果をグラフ化することが出来ます。MRTGよりも優れている点はいくつもありますが、まずはその操作性を体験してみて下さい。ホストの追加やインタフェースの追加など、全てWEBのGUIを通してコンフィグレーション可能なので、慣れるととても楽です。 ↑ RRDToolのGUIフロントエンド † cactiはグラフデータの保存やグラフ生成に、MRTGより高機能なRRDTool*3を使っています。cactiではRRDToolの複雑なコマンドラインオプションと格闘することなく、RRDTool
Riemann aggregates events from your servers and applications with a powerful stream processing language. Send an email for every exception raised by your code. Track the latency distribution of your web app. See the top processes on any host, by memory and CPU. Combine statistics from every Riak node in your cluster and forward to Graphite. Send alerts when a key process fails to check in. Know ho
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EC2 Reachability Test - IPv4