Ryo Ueda on CENG Lab -- Ryo Ueda

Git Cheatsheet

Wed, 10 Jun 2026 00:00:00 +0000

A quick reference for the Git commands used most often in day-to-day development.

Cloning and branches #

git clone <URL> — clone a repository to your local workspace
git checkout <branch> — switch to an existing branch
git checkout -b <branch> — create a new branch and switch to it
git branch — list local branches
git branch -vv — list local branches with their last commit and the upstream (remote-tracking) branch they’re tracking, e.g. [origin/main: ahead 2]

Staging and unstaging #

git add . / <file> — stage changes in a file (or all changes with .)
git reset — unstage all changes, keeping the changes in your working directory intact (equivalent to git reset --mixed HEAD)
git restore <file> — restore a file in the working tree from the index (staging area), discarding unstaged edits. To also discard staged changes and fully revert to the last commit, use git restore --staged <file> first (or git restore --source=HEAD --staged --worktree <file> to do both in one step)

Inspecting changes #

git diff — show unstaged changes
git diff --staged — show staged changes (equivalent to git diff --cached)
git status — show both staged and unstaged changes

Committing and remotes #

git commit -m "comment" — save staged changes to the current branch
git remote -v — list remote repositories and their fetch/push URLs
git remote add origin <URL> — register a remote repository under the name “origin”
git remote set-url origin <URL> — change the URL associated with the “origin” remote
git push -u origin <local branch>:<remote branch> — push a branch to the remote and set it as the upstream for future git push/git pull

Stash #

git stash — save local changes and remove them from the working tree
git stash apply — reapply the most recently stashed changes
git stash clear — remove all stashed changes

Merge #

git merge <branch> — merge the given branch into the current branch
git merge --abort — cancel an in-progress merge and return to the pre-merge state

【ClaudeCode】【Lab】MCP Server Integration: Notion + Claude Code

Mon, 08 Jun 2026 00:00:00 +0000

Overview #

In this lab, we are going to create a pipleline to publish a webpage by scanning Notion note and rendering it to a publishable format. This pipeline reads a Notion note via MCP, runs a web-search fact-check with a human review checkpoint, then writes a publishable Hugo .md directly into the repo.

Architecture #

Notion (study note)
 │ ← Notion hosted MCP — read only
 ▼
Claude Code
 ├─ Stage 1: read note, echo for confirmation
 ├─ Stage 2: fact-check against primary sources → human checkpoint
 └─ Stage 3: write Hugo-ready .md to content/
 │ ← git commit + push
 ▼
ofurotime.ca

Part 1 — Connect Notion MCP #

Hosted endpoint (recommended):

【ClaudeCode】【Note】MCP 101

Mon, 08 Jun 2026 00:00:00 +0000

What Is MCP? #

Model Context Protocol (MCP) is an open protocol that standardizes how AI assistants connect to external systems — apps, data sources, APIs, and files.

Mental model: a USB-C port for AI — one standard connector instead of a custom integration per tool.

MCP was introduced by Anthropic in November 2024, then donated to the Agentic AI Foundation (AAIF) under the Linux Foundation in December 2025. It is now co-governed by Anthropic, Block, OpenAI, Google, Microsoft, AWS, Cloudflare, and Bloomberg — vendor-neutral by design. (as of 2025-12-09)

IaC Scanning Tools: Checkov, TFLint, Grype, and pre-commit

Mon, 08 Jun 2026 00:00:00 +0000

Tool Overview #

Tool	Role	What it catches
Checkov	IaC security scanner	Misconfigurations in Terraform, CloudFormation, K8s
TFLint	Terraform linter	Invalid resource types, deprecated syntax, bad practices
Grype	Vulnerability scanner	CVEs in container images, filesystems, SBOMs
pre-commit	Git hook framework	Runs all of the above automatically on every commit

git commit → pre-commit → TFLint + Checkov (local)
 ↓
 CI pipeline → Checkov + TFLint + Grype (full gate)

1. Checkov #

Static analysis tool for IaC security. 1,000+ built-in policies covering AWS, Azure, GCP, and Kubernetes. Maintained by Palo Alto Networks (acquired Bridgecrew) under Apache 2.0.

【Claude Code】【Note】: Fundamentals Guide

Sun, 07 Jun 2026 00:00:00 +0000

What is Claude Code? #

Claude Code is an AI-powered coding agent that runs in your terminal. Unlike a chat interface that generates code snippets, it is an agent that plans work, reads your codebase, edits files, runs commands, and verifies results — all autonomously.

Think of it as a developer working alongside you in your terminal, with access to the same files and tools you use.

【Lab】Static Website with Hugo + AWS

Sun, 07 Jun 2026 00:00:00 +0000

Overview #

This lab covers building a personal website from scratch using Hugo as a static site generator, the Congo theme for design, and AWS S3 + CloudFront for hosting and content delivery.

Tech Stack:

Hugo v0.162.0 (snap) on Ubuntu WSL2
Theme: Congo (Tailwind CSS based)
Hosting: AWS S3 + CloudFront
Domain: ofurotime.ca

Phase 1: Environment Setup #

Installing Hugo #

Ubuntu’s apt package manager ships an outdated version of Hugo. To get the latest version, use snap instead:

AWS VPC Basics

Sat, 06 Jun 2026 00:00:00 +0000

What is a VPC? #

A Virtual Private Cloud (VPC) is a logically isolated network within AWS. It gives you full control over IP ranges, subnets, route tables, and gateways.

Key Components #

Subnets #

Public subnet — has a route to an Internet Gateway; hosts resources accessible from the internet
Private subnet — no direct internet route; hosts databases, backend services

Internet Gateway (IGW) #

Attached to a VPC to allow communication between resources in the VPC and the internet.

BGP Fundamentals

Sat, 06 Jun 2026 00:00:00 +0000

What is BGP? #

Border Gateway Protocol (BGP) is the routing protocol of the internet. It is a path-vector protocol used to exchange routing information between autonomous systems (AS).

eBGP vs iBGP #

	eBGP	iBGP
Scope	Between different ASes	Within the same AS
TTL	1 (directly connected)	255
Next-hop	Changes at each hop	Unchanged by default
AD	20	200

BGP Path Selection Order #

BGP selects the best path using the following attributes in order:

About

Mon, 01 Jan 0001 00:00:00 +0000

Cloud Network Engineer with end-to-end experience in telco networking — from on-premise carrier infrastructure to cloud-native, infrastructure-as-code environments.

My background spans large-scale carrier operations — monitoring and troubleshooting global IP-VPN backbones across MPLS, BGP, and SD-WAN, isolating faults across the full network path, and keeping enterprise services running 24/7 — as well as hands-on infrastructure work deploying campus networks, routers, switches, and VLANs from the ground up.

On the cloud side, I build AWS and GCP infrastructure as code, develop Terraform modules, and engineer the large, complex environments a 5G mobile core demands.