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How to connect your iPhone X running iOS 14.2 to the Rakuten Mobile network

This article will explain how you can use your iPhone X running iOS 14.2 on the Rakuten Mobile network in Japan. These instructions also apply to those who are on the Rakuten Mobile network and have updated iOS on their iPhone X. Continue reading “How to connect your iPhone X running iOS 14.2 to the Rakuten Mobile network”

Hands-On Guide: Connecting a Raspberry Pi Running Node.js to AWS IoT Core

In this hands-on guide, we will install Node.js on a Raspberry Pi 3 Model B+ and then connect our device to the AWS IoT Core service. This service connects to the Amazon Web Services (AWS) platform by using the MQTT publish-subscribe-based messaging protocol and lets your device communicate with other services on the platform.

Continue reading “Hands-On Guide: Connecting a Raspberry Pi Running Node.js to AWS IoT Core”

Achievement Unlocked: I’m Now an AWS Certified Cloud Practitioner!

I recently started going hands on with services on the AWS platform and decided to take the entry-level certification exam. Since I live in Tokyo, my biggest worry was that the exam would be available only in Japanese. Fortunately, the exams are offered in Japanese or English. This article describes my experience scheduling and taking the exam to obtain certification as an AWS Certified Cloud Practitioner as a foreigner in Japan.

Continue reading “Achievement Unlocked: I’m Now an AWS Certified Cloud Practitioner!”

Creating a Script to Update Multiple Raspberry Pi Devices

Out of habit, whenever I turn on my laptop, I open five instances of PuTTY and connect to each of my Raspberry Pi devices. Then, I check for updates on each by running sudo apt-get update and sudo apt-get dist-upgrade. Over the Golden Week holiday, I thought, “Why don’t I create a script that runs the update commands across all five devices?” Continue reading “Creating a Script to Update Multiple Raspberry Pi Devices”

Creating moodfulness, a Mood-Tracking Web App

I’ve recently been working on a web app called moodfulness, which lets users enter whether they are happy or sad and then plots those moods on a map. In developing this app, I focused on usability, such as ensuring consistency and conducting A/B testing, and data visualization. Continue reading “Creating moodfulness, a Mood-Tracking Web App”

Fixing Database Connection Issues in Jira Core After a Power Outage

This article is for system administrators who encounter issues with using Jira Core in a Linux-based environment after a power outage. Continue reading “Fixing Database Connection Issues in Jira Core After a Power Outage”

Recreating ddclient Cache to Update New IP Address on Domain Name Registrar

This document is intended for those who are experiencing problems with updating a newly assigned IP address of a web server by using ddclient.

This article is intended for system administrators who experience problems with updating a newly assigned IP address of a web server by using ddclient. Continue reading “Recreating ddclient Cache to Update New IP Address on Domain Name Registrar”