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-firewall-and-access-control.en https://www.youngju.dev/blog/linux/2026-08-15-guide-firewall-and-access-control.en Starts from the structure of nftables and lays out what firewalld and ufw do on top of it. Covers the procedure that keeps you from locking yourself out while changing rules remotely, and the diagnostic order for when rules do not take effect. Sat, 15 Aug 2026 00:00:00 GMT fjvbn2003@gmail.com (Youngju Kim) 리눅스방화벽nftablesfirewalld보안네트워크 https://www.youngju.dev/blog/linux/2026-08-15-guide-firewall-and-access-control.ja https://www.youngju.dev/blog/linux/2026-08-15-guide-firewall-and-access-control.ja nftablesの構造から出発し、firewalldとufwがその上で何をしているのかを整理します。リモートでルールを変更する際に自分自身を締め出さない手順と、ルールが適用されないときの診断順序を扱います。 Sat, 15 Aug 2026 00:00:00 GMT fjvbn2003@gmail.com (Youngju Kim) 리눅스방화벽nftablesfirewalld보안네트워크 https://www.youngju.dev/blog/linux/2026-08-15-guide-firewall-and-access-control https://www.youngju.dev/blog/linux/2026-08-15-guide-firewall-and-access-control nftables의 구조에서 출발해 firewalld와 ufw가 그 위에서 무엇을 하는지 정리합니다. 원격에서 규칙을 바꾸다 스스로 잠기지 않는 절차와 규칙이 적용되지 않을 때의 진단 순서를 다룹니다. Sat, 15 Aug 2026 00:00:00 GMT fjvbn2003@gmail.com (Youngju Kim) 리눅스방화벽nftablesfirewalld보안네트워크