[작성자:] black K
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K8S Calico vs Cilium — Beyond a Simple CNI Comparison: A Clash of Networking Philosophies
K8S Calico vs Cilium Among Kubernetes CNI plugins, the two names compared most often are Calico and Cilium.Both handle Pod-to-Pod communication, but their approaches could not be more different. Calico relies on traditional Linux networking — iptables and BGP — to build a simple and predictable L3 network.Cilium, on the other hand, uses eBPF to…
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K8S Calico vs Cilium — 단순한 CNI 비교를 넘어, 네트워킹 철학의 충돌
K8S Calico vs Cilium 쿠버네티스 네트워크 플러그인(CNI) 중 가장 자주 비교되는 두 이름, Calico와 Cilium.둘 다 Pod 간 통신을 책임지는 핵심 구성요소지만, 접근 방식은 완전히 다르다.Calico는 전통적인 리눅스 네트워킹 — iptables와 BGP를 이용해 단순하고 예측 가능한 L3 네트워크를 만든다.반면 Cilium은 eBPF를 기반으로 커널 수준에서 트래픽을 직접 제어하며, L7까지 관찰과 정책을 확장한다. 결국 이 비교는 “어떤…
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TCP TIME_WAIT — The Brief Resurrection of a Dead Socket
If you’re a systems engineer, you’ve definitely seen the word TIME_WAIT before.A single ss -tan command will easily show hundreds of them.At first glance, most people think, “Isn’t this just wasting resources?”But the truth is, it’s not some meaningless leftover —it’s a stabilization phase TCP leaves behind to ensure that every last byte of data…
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TCP TIME_WAIT — 죽은 소켓의 부활을 기다리는 시간
시스템 엔지니어라면 TIME_WAIT이라는 글자를 안 본 사람은 없을 거다.ss -tan 명령어 한 번만 실행해도 어김없이 수백 개는 떠 있다.대부분 처음엔 “이거 리소스 낭비 아냐?”라고 생각한다.하지만 이 상태는 결코 ‘불필요한 잔재’가 아니다.TCP가 데이터 유실 없이 통신을 끝내기 위해 남겨둔,일종의 사후 안정 구간이다. TCP 종료는 “닫기”가 아니라 “정리 과정” 이다 TCP는 단순히 “끝났다”로 끝나지 않는다.서버와 클라이언트가 서로…
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Visualizing Key Kubernetes Pod Metrics with Zabbix (Deep-Dive Guide) — Building a Dynamic Grafana Dashboard for Pod CPU & Memory Usage
Ready to streamline your complex Zabbix operations? I’ve distilled the most valuable insights from this blog into one essential guide. Take full control of your environment with the Zabbix 7 Enterprise Optimization Handbook [Mastering Hybrid Infrastructure Monitoring with a Kubernetes First Approach]. 👉 Get your PDF copy here: https://jikimy.gumroad.com/l/zabbixmaster Overview I wrote about this topic…
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Zabbix と Slack の通知連携：Webhook 設定からアクション自動化までの完全ガイド
概要 Zabbix の標準通知機能だけでは、リアルタイムな監視対応が難しい。Slack の Webhook を利用すれば、障害発生や復旧通知を即座に受け取ることができる。 本記事は Zabbix 7.4 + Slack Webhook 環境での通知連携を完全に構築するための実務ガイドである。以下の手順どおりに設定すれば、運用環境でもそのまま使用可能だ。 1. 事前チェック 1.1 アウトバウンド通信の許可 Zabbix サーバーから hooks.slack.com:443 への通信が許可されている必要がある。ファイアウォールやプロキシ環境では、このドメインとポートを例外として許可する。 1.2 Slack チャンネルと Webhook の作成 Slack で監視専用チャンネルを新規作成する。チャンネル設定 → 「Add App」→「Incoming Webhooks」を選択 → Webhook URL を発行。 1.3 Webhook の有効性テスト Zabbix サーバーで以下のコマンドを実行し、Webhook が正常に動作するか確認する。 以下のコマンドの webhook url 部分を、Slack で発行された Webhook アドレスに置き換えて実行する。 Slack チャンネルにメッセージが届けば、Webhook は正常に動作している。 2. Zabbix URL…
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Visualizing Zabbix Metrics with Grafana (Part 4) — Building Dynamic Dashboards with Variables
Ready to streamline your complex Zabbix operations? I’ve distilled the most valuable insights from this blog into one essential guide. Take full control of your environment with the Zabbix 7 Enterprise Optimization Handbook [Mastering Hybrid Infrastructure Monitoring with a Kubernetes First Approach]. 👉 Get your PDF copy here: https://jikimy.gumroad.com/l/zabbixmaster 📘 Overview If you’ve completed the…
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Visualizing Zabbix Metrics with Grafana (Part 3) — Building a Static Dashboard for CPU, Memory, and Disk
Ready to streamline your complex Zabbix operations? I’ve distilled the most valuable insights from this blog into one essential guide. Take full control of your environment with the Zabbix 7 Enterprise Optimization Handbook [Mastering Hybrid Infrastructure Monitoring with a Kubernetes First Approach]. 👉 Get your PDF copy here: https://jikimy.gumroad.com/l/zabbixmaster 📘 Overview After completing the Zabbix…
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Visualizing Zabbix Metrics with Grafana (Part 2) —Installing the Zabbix Plugin and Connecting the Data Source
Ready to streamline your complex Zabbix operations? I’ve distilled the most valuable insights from this blog into one essential guide. Take full control of your environment with the Zabbix 7 Enterprise Optimization Handbook [Mastering Hybrid Infrastructure Monitoring with a Kubernetes First Approach]. 👉 Get your PDF copy here: https://jikimy.gumroad.com/l/zabbixmaster 📘 Overview If you’ve completed the…