I’m seichan, and I run the blog “Becoming an Infrastructure Engineer.”
About this blog
I started this blog in 2004, writing mainly about FreeBSD and other Unix-like systems. Until October 2026 it was called “Tsurezure naru mama ni” (a phrase from a classic Japanese essay, roughly “as idle thoughts come to mind”).
Today the blog focuses on introductory series for people who want to learn the fundamentals of IT infrastructure. Each series is based on materials I used in study sessions. Slides alone often leave out the background and the points where people get stuck when they actually try things, so the articles fill those gaps with text and diagrams.
The English edition
The blog is written in Japanese. Since November 2026, I have been publishing English editions of some series, starting with DNS Fundamentals (12 parts). The diagrams have been redrawn in English as well.
Series topics (in Japanese)
- Servers and networking: DNS, email (SMTP, POP, IMAP), NTP, syslog, TCP/IP, HTTP, DHCP, SSH, FTP, SNMP, RADIUS
- Files and storage: storage, backup, NFS, SMB
- Authentication and directories: certificates, LDAP, Kerberos, Active Directory, federation
- Databases and character encoding: relational databases and SQL, character encoding
- Cloud: an introduction to the cloud, and AWS design (security foundations, compute, databases, storage, networking, processing patterns, and more)
- Generative AI: using Claude, and Claude Code in practice
Certifications
- AWS Certified Solutions Architect – Professional
- AWS Certified Solutions Architect – Associate
- Nutanix Certified Professional – Multicloud Infrastructure 6
- Palo Alto Networks System Engineer (PSE) – Hardware Firewall Professional
YouTube and X
- YouTube: インフラエンジニアへの道 (in Japanese). Videos that walk through the blog’s series.
- X (formerly Twitter): @r31gtstb (in Japanese). Announcements of new articles.
Contact
To get in touch, please see the Contact page.