http://phinguin.dev/tags/linux/ Recent content in Linux on phinguin123 Hugo en-us 2026 phinguin Thu, 26 Mar 2026 12:12:00 +0900 http://phinguin.dev/blog/what-ssl-certificate-files-actually-do/ Thu, 26 Mar 2026 12:12:00 +0900 http://phinguin.dev/blog/what-ssl-certificate-files-actually-do/ cert.crt, chain_cert.crt, root_cert.crt and a .key. I’d installed them a dozen times without knowing why there were four, so I finally sat down and worked it out on my own server. http://phinguin.dev/blog/dev-and-prod-on-one-server/ Thu, 05 Feb 2026 12:56:00 +0900 http://phinguin.dev/blog/dev-and-prod-on-one-server/ Running dev and prod side by side on one AWS box. Compose project names fixed the collisions, and made it really easy to forget everything Docker doesn’t own. http://phinguin.dev/blog/who-actually-visited-the-landing-page/ Mon, 24 Nov 2025 11:43:00 +0900 http://phinguin.dev/blog/who-actually-visited-the-landing-page/ Answering a marketing question with grep and awk on nginx access logs: requests vs. visitors, bots, timezones, and why the log can’t tell you what the browser never sent. http://phinguin.dev/blog/a-debugger-from-ptrace/ Sun, 23 Jul 2023 12:00:00 +0900 http://phinguin.dev/blog/a-debugger-from-ptrace/ A small C debugger that single-steps a program, rewrites its registers and memory, and changes what it does. Then figuring out why real debuggers don’t work like that — a breakpoint is literally one byte, 0xCC.