https://www.youngju.dev/blog 천천히 올바르게. AI Researcher & DevOps Engineer Youngju's blog. GPU/CUDA, LLM, MLOps, Kubernetes AI workloads, and data engineering — plus mindset essays on confidence, routines, health, and sport psychology. ko fjvbn2003@gmail.com (Youngju Kim) fjvbn2003@gmail.com (Youngju Kim) Sat, 15 Aug 2026 00:00:00 GMT https://www.youngju.dev/blog/linux/2026-08-15-guide-dns.en https://www.youngju.dev/blog/linux/2026-08-15-guide-dns.en Splits name resolution into five separate segments — stub resolver through authoritative server — and works through record types, TTL and caching, delegation, reading dig output, propagation delay and stale caches, DNSSEC, and running DNS inside a company. Every command and rule here was checked against the RFC text and the manual pages. Sat, 15 Aug 2026 00:00:00 GMT fjvbn2003@gmail.com (Youngju Kim) 리눅스dns네트워크운영트러블슈팅dig https://www.youngju.dev/blog/linux/2026-08-15-guide-dns.ja https://www.youngju.dev/blog/linux/2026-08-15-guide-dns.ja スタブリゾルバーから権威サーバーまで、名前解決の経路を区間ごとに分けたうえで、レコードタイプと TTL、委任、dig の読み方、伝播遅延とスタイルキャッシュ、DNSSEC、社内 DNS の運用までを整理します。コマンドとルールは RFC 原文とマニュアルで確認したものだけを載せました。 Sat, 15 Aug 2026 00:00:00 GMT fjvbn2003@gmail.com (Youngju Kim) 리눅스dns네트워크운영트러블슈팅dig https://www.youngju.dev/blog/linux/2026-08-15-guide-dns https://www.youngju.dev/blog/linux/2026-08-15-guide-dns 스텁 리졸버부터 권한 서버까지 이름 해석 경로를 구간별로 나누고, 레코드 타입과 TTL, 위임, dig 출력 해석, 전파 지연과 스테일 캐시, DNSSEC, 사내 DNS 운영까지 정리합니다. 명령과 규칙은 RFC 원문과 매뉴얼에서 확인한 것만 실었습니다. Sat, 15 Aug 2026 00:00:00 GMT fjvbn2003@gmail.com (Youngju Kim) 리눅스dns네트워크운영트러블슈팅dig https://www.youngju.dev/blog/linux/2026-08-15-guide-file-descriptors-and-inodes.en https://www.youngju.dev/blog/linux/2026-08-15-guide-file-descriptors-and-inodes.en Starts from the relationship between inodes and directory entries and works through hard links, deleted-but-still-open files, inode exhaustion, and file descriptor limits. Covers why df and du diverge and how to recover, command by command. Sat, 15 Aug 2026 00:00:00 GMT fjvbn2003@gmail.com (Youngju Kim) 리눅스파일시스템inode파일디스크립터운영트러블슈팅 https://www.youngju.dev/blog/linux/2026-08-15-guide-file-descriptors-and-inodes.ja https://www.youngju.dev/blog/linux/2026-08-15-guide-file-descriptors-and-inodes.ja inode とディレクトリエントリの関係から出発して、ハードリンク、削除された開きっぱなしのファイル、inode の枯渇、ファイルディスクリプタの上限までを整理します。df と du が食い違う理由と復旧方法をコマンド単位で扱います。 Sat, 15 Aug 2026 00:00:00 GMT fjvbn2003@gmail.com (Youngju Kim) 리눅스파일시스템inode파일디스크립터운영트러블슈팅 https://www.youngju.dev/blog/linux/2026-08-15-guide-file-descriptors-and-inodes https://www.youngju.dev/blog/linux/2026-08-15-guide-file-descriptors-and-inodes inode와 디렉터리 엔트리의 관계에서 출발해 하드 링크, 삭제된 열린 파일, inode 고갈, 파일 디스크립터 한도까지 정리합니다. df와 du가 어긋나는 이유와 복구 방법을 명령 단위로 다룹니다. Sat, 15 Aug 2026 00:00:00 GMT fjvbn2003@gmail.com (Youngju Kim) 리눅스파일시스템inode파일디스크립터운영트러블슈팅 https://www.youngju.dev/blog/linux/2026-08-15-guide-linux-troubleshooting-commands.en https://www.youngju.dev/blog/linux/2026-08-15-guide-linux-troubleshooting-commands.en The diagnostic commands to run, in order, from the moment someone tells you a server is misbehaving. uptime, top, free, df, iostat, ss, journalctl — which number in each output to read, and what that number rules out versus what it leaves standing. Sat, 15 Aug 2026 00:00:00 GMT fjvbn2003@gmail.com (Youngju Kim) 리눅스트러블슈팅운영장애대응명령어성능 https://www.youngju.dev/blog/linux/2026-08-15-guide-linux-troubleshooting-commands.ja https://www.youngju.dev/blog/linux/2026-08-15-guide-linux-troubleshooting-commands.ja サーバーの様子がおかしいと連絡を受けた瞬間から順番に実行する診断コマンドを整理します。uptime、top、free、df、iostat、ss、journalctlまで、各出力のどの数字を見るべきか、その数字が何を除外して何を残すのかを説明します。 Sat, 15 Aug 2026 00:00:00 GMT fjvbn2003@gmail.com (Youngju Kim) 리눅스트러블슈팅운영장애대응명령어성능 https://www.youngju.dev/blog/linux/2026-08-15-guide-linux-troubleshooting-commands https://www.youngju.dev/blog/linux/2026-08-15-guide-linux-troubleshooting-commands 서버가 이상하다는 연락을 받은 순간부터 순서대로 실행하는 진단 명령어를 정리합니다. uptime, top, free, df, iostat, ss, journalctl까지 각 출력의 어느 숫자를 봐야 하는지, 그 숫자가 무엇을 배제하고 무엇을 남기는지 설명합니다. Sat, 15 Aug 2026 00:00:00 GMT fjvbn2003@gmail.com (Youngju Kim) 리눅스트러블슈팅운영장애대응명령어성능