Cloud & DevOps

Cloud & DevOps

Jason Yang · 29 Mar, 2026

Struggling with CORS errors in GCP? How CORS actually works across GCS, API Gateway, and Signed URLs, with practical examples and debugging tips.

Cloud & DevOps

Jason Yang · 25 Mar, 2026

Set up HTTPS with Certbot, Let's Encrypt, and Nginx in Docker: certificate issuance, renewal, and full automation in a simple, practical walkthrough.

Cloud & DevOps

Jason Yang · 25 Mar, 2026

Set up a local Docker registry on your LAN to build and deploy images across machines with no cloud costs — plus automated redeploys with Watchtower, all free.

Cloud & DevOps

Jason Yang · 07 Dec, 2025

GCP Service Account Impersonation lets your MFA-authenticated account borrow a service account's permissions with short-lived tokens instead of risky key.json files. Here's the 3-step setup.

Cloud & DevOps

Jason Yang · 04 Dec, 2025

TCP explained: how the segment header, the 3-way handshake, and flow control build a reliable connection over an unreliable network.

Cloud & DevOps

Jason Yang · 29 Nov, 2025

The OSI 7-layer model reference: each layer's function, protocols (HTTP, TCP/IP), PDUs, and devices in one table — great for CCNA and CompTIA prep.

Cloud & DevOps

Jason Yang · 25 Nov, 2025

Publish private Python libraries to GCP Artifact Registry with Poetry: the critical publish-vs-install URL distinction that avoids 404s, plus auth tokens.

Cloud & DevOps

Jason Yang · 22 Nov, 2025

Change the hostname on Amazon Linux so it survives a reboot — edit /etc/sysconfig/network, /etc/hostname, and /etc/hosts so the change persists.

Cloud & DevOps

Jason Yang · 18 Nov, 2025

Connect to GCP Cloud SQL (PostgreSQL) from your local machine with Cloud SQL Auth Proxy — an IAM-authenticated TLS tunnel, no public IP or static passwords.