Posts on No Subject - nosubject.io -

Migrating from WordPress to Hugo

Thu, 09 Jul 2026 00:00:00 +0900

I decided to migrate this site, which had been running on WordPress, to Hugo.

WordPress is convenient. You can write posts from the admin screen, and there are many themes and plugins. But after running it for a long time, the number of things to maintain keeps growing little by little: PHP, MySQL, plugins, themes, security updates, backups, and so on.

This blog is mostly a place where I leave notes about things I looked up. I do not need much dynamic behavior. For that kind of use, managing posts as Markdown files and publishing static HTML with Hugo feels like a better fit.

Switching the Raspberry Pi WordPress Site to Hugo

Thu, 09 Jul 2026 00:00:00 +0900

I already wrote about migrating the article data from WordPress to Hugo in Migrating from WordPress to Hugo.

This article covers the next step: switching the actual WordPress environment running on my Raspberry Pi to Hugo.

Even when I built the environment myself, I forget the details after enough time passes. Looking back at my older notes, this site was not running WordPress directly on the host with PHP and MySQL. It was running through Docker.

Windows 11 Ubuntu 24.04 (WSL): Change the Default Editor from nano to vi

Wed, 27 Aug 2025 23:48:27 +0900

Overview

When you run a command such as visudo on a newly installed Ubuntu system, it can be surprising to see nano start up. This is a note on how to change the default editor from nano to vi.

Test Environment

Windows 11 Pro
Ubuntu 24.04.3 LTS (WSL)

How to Change It

Temporarily Change It with an Environment Variable

Set the EDITOR environment variable, or run the command with env as shown below.

How I Improved the Loose USB Type-C Connection on My Google Pixel

Fri, 11 Jul 2025 18:51:09 +0900

Overview

I use Google Maps through Android Auto on my Pixel 7a as the car navigation system in my AQUA. Recently, the navigation would stop more often because of a loose USB Type-C connection.

I was having trouble finding a workaround, but then I came across information online saying that a Type-C connector can become unstable if it is inserted too deeply. This is what happened when I tried that idea.

[Windows 11] Tweak the Registry to Let JIS and US Keyboard Layouts Coexist

Wed, 18 Jun 2025 22:49:06 +0900

Overview

When you connect an English-layout keyboard to a Japanese-layout laptop, the Windows settings only let you choose either the JIS layout or the US layout, which makes one of the keyboards awkward to use.

Method

[Windows 10 / Windows 11] Make JIS and US keyboard layouts coexist by editing the registry

Just by following the procedure described there, I was able to set the built-in PS/2 keyboard to the JP layout even while the system keyboard setting was set to the US layout.

[Windows 11] Tweak the Registry to Let JIS and US Keyboard Layouts Coexist

Wed, 18 Jun 2025 10:01:12 +0900

[Windows 11] Tweaking the registry to allow JIS and US keyboard layouts to coexist

Overview

Method

[Windows 10 / Windows 11] Make JIS and US keyboard layouts coexist by editing the registry

Just by following the procedure described there, I was able to set the built-in PS/2 keyboard to the JP layout even while the system keyboard setting was set to the US layout.

Notes on Blocking Attacks Against Raspberry Pi SSH with Fail2Ban

Sun, 01 Sep 2024 23:16:45 +0900

Overview

I expose the SSH Server port so I can access my Raspberry Pi remotely, and when I looked at the logs, I saw that it was being attacked fairly often. Password login is disabled, so I could ignore it, but it felt unpleasant, so I configured Fail2Ban.

$ journalctl _COMM=sshd | grep "Invalid user"
Aug 11 09:23:53 pi4col sshd[1105]: Invalid user blank from 183.67.43.194 port 44130
Aug 11 09:44:30 pi4col sshd[1118]: Invalid user pi from 199.76.38.123 port 36840
Aug 11 09:44:30 pi4col sshd[1119]: Invalid user pi from 199.76.38.123 port 36844
Aug 11 09:45:33 pi4col sshd[1122]: Invalid user Admin from 138.75.192.20 port 52632
Aug 11 10:07:10 pi4col sshd[1197]: Invalid user blank from 61.83.254.100 port 38377
Aug 11 10:26:35 pi4col sshd[1268]: Invalid user nosubject from 152.136.41.3 port 55696
Aug 11 10:28:44 pi4col sshd[1270]: Invalid user admin from 121.7.26.195 port 50064
Aug 11 10:49:04 pi4col sshd[1282]: Invalid user babs from 81.70.27.122 port 45998
Aug 11 10:49:11 pi4col sshd[1284]: Invalid user zookeeper from 46.191.141.152 port 35283
...

What Is Fail2Ban?

Fail2Ban is a tool that checks access logs and bans addresses that repeatedly produce login errors, such as from brute-force attacks. This time, I use it to ban unauthorized SSH access.

[Raspberry Pi] How Do I Turn Off Wi-Fi and Bluetooth on Raspberry Pi OS?

Wed, 27 Mar 2024 23:44:45 +0900

On Raspberry Pi OS, you can use the rfkill command to turn wireless functions on and off.
The rfkill command can turn Wi-Fi and Bluetooth on and off.

Test Environment

Raspberry Pi OS - Debian GNU/Linux 12 (bookworm)

Raspberry Pi 5 8GB Model: Raspberry Pi 5 Model B Rev 1.0 (Rev. d04170)

Raspberry Pi 4 8GB Model: Raspberry Pi 4 Model B Rev 1.4 (Rev. d03114)

Check the Device ID

Check the number in the ID column. In the example below, the Bluetooth device is 0 and Wi-Fi is 1.

Emacs Key Binding Settings for Sakura Editor

Wed, 14 Feb 2024 13:02:17 +0900

It is rough being in an environment where only Sakura Editor can be used.

Reposted from the following. (Because the environment could not even extract LZH files, I converted it to Zip.)

http://sakura.qp.land.to/?Customize%2F%C5%EA%B9%C6%2F6

SakuraEmacsKey Download

Type-specific settings for XML Download

Change the Windows 11 PIN (Windows Hello) Length from 6 Digits to 4 Digits

Wed, 09 Aug 2023 12:49:37 +0900

I use a PIN on Windows 11. By default, the minimum length was 6 digits, so I tried changing it to 4 digits.

Test Environment

OS: Windows 11 Pro 22H2 22621.2070
CPU: Core i7 13700
RAM: 64 GB

Configuration

Press Win + R (Run), enter gpedit.msc, and open the Local Group Policy Editor.

From the tree on the left, select Computer Configuration -> Administrative Templates -> System -> PIN Complexity. The Minimum PIN length item shown on the right is the setting for the number of PIN digits.
By default, it is Not configured (= 6 or more digits).

A Quick Way to Install WSL2 (Ubuntu) and Docker Desktop on Windows 11

Thu, 03 Aug 2023 12:13:54 +0900

This is a note from installing WSL and Docker Desktop in a Windows 11 Pro environment.

Overview

When using Docker containers on Windows, I use Docker Desktop.
For paid licensing and various other reasons, it seems people are moving away from Docker, but it is still easy and convenient when you want to verify something quickly.

On Windows 10, setting up WSL took a bit of work, but recent Windows 11 versions seem to install it quickly, so I wanted to try it.

[Python] What to Do When Sending Packets with Scapy as a General User Returns error: [Errno 1] Operation not permitted

Thu, 19 Jan 2023 10:56:58 +0900

Apparently, handling raw packets requires the Linux capability cap_net_raw.

The only apparent options are to run Python with sudo or grant the capability to /usr/bin/python3.

$ sudo setcap cap_net_raw=eip $(readlink -f $(which python3))

For a development environment, I think this is fine.

Reference: https://stackoverflow.com/questions/22421290/scapy-operation-not-permitted-when-sending-packets

How to Run SSHd with Systemd in a CentOS 7 Docker Container

Fri, 17 Jun 2022 20:05:58 +0900

I use Docker Desktop on Windows.

This time I needed to use Systemd on CentOS 7, so I looked into it.

Overview

If you run CentOS 7 in a container without doing anything special, running the systemctl command produces an error like this.

sh-4.2# systemctl start sshd
Failed to get D-Bus connection: Operation not permitted

https://hub.docker.com/_/centos/

リンク先を開く

hub.docker.com

To avoid this, you need to add options when starting the container. Docker Hub describes this, but even following those instructions did not work for me. The required settings seem to differ depending on the environment.

How to Change the Memory Limit in a Docker Desktop Environment

Wed, 15 Jun 2022 15:16:53 +0900

I run containers in a Docker Desktop environment, but they run with less memory than the physical memory available, so I tried increasing the memory allocation. This applies only to environments using the WSL 2 backend.

Overview

Docker Desktop is affected by WSL2's memory limit. On Windows 10, the default memory allocated to WSL2 appears to be 80% of the host memory. When I checked my own environments, they looked like this.

Can a mineo SIM Be Used in a WiMAX+ Wi-Fi Router, the Speed Wi-Fi NEXT W06?

Mon, 23 May 2022 22:46:23 +0900

This feels a little late, but I tried using a mineo SIM in a Speed Wi-Fi NEXT W06.

Background

Recently, I have liked mineo's 1GB data plan (880 yen/month) + Packet Unlimited Plus (385 yen/month).

If you are fine with a maximum speed of 1.5 Mbps, you can get an unlimited-data environment for about 1,300 yen per month. (If you are thinking about joining mineo, you can sign up at a discount through the referral link below.)

WENRUI (ROYAL KLUDGE RK61) Key Setting Shortcuts

Sat, 21 May 2022 18:16:02 +0900

Notes on switching keys on the WENRUI mechanical keyboard.

Overview

I use a mechanical keyboard sold as the "WENRUI Mechanical Keyboard", but inside it is a ROYAL KLUDGE RK61.

Customizing the Key Layout of the WENRUI (ROYAL KLUDGE RK61) Mechanical Keyboard

Tue, 08 Feb 2022 10:18:35 +0900

This is a note from when I tried customizing the key layout of the WENRUI mechanical keyboard (blue switches) that I bought on Amazon.

Overview

I bought a gaming keyboard on Amazon called the "WENRUI Mechanical Keyboard", and it was engraved ROYAL KLUDGE RK61.

[Raspberry Pi 4] USB Boot: Stop Using an SD Card and Boot from an SSD

Thu, 06 Jan 2022 17:12:07 +0900

This is a memo from migrating a Raspberry Pi web server that had been running from an SD card to an SSD with USB boot. I had written about something similar before; this time only the data-copying method is different. This procedure may be easier.
The steps are for Ubuntu, but I think almost the same method can be used with Raspberry Pi OS. This is amateur work, so follow it at your own risk if you use it as a reference.

[Raspberry Pi 4] Four-Channel Terrestrial Digital Recording Server on a Raspberry Pi: Docker + GPU Encoding Version

Sat, 18 Sep 2021 08:30:00 +0900

This is a memo for enabling hardware encoding in EPGStation running on a Raspberry Pi. It continues from the previous article, [Raspberry Pi 4] Four-Channel Terrestrial Digital Recording Server on Ubuntu with PX-Q1UD. Some parts still do not work perfectly, but the GPU appears to be usable, and it is mostly operational now.

This is amateur work, so follow it at your own risk if you use it as a reference.

[Raspberry Pi 4] Headless Install of 64-bit Raspberry Pi OS (No Monitor or Keyboard Needed)

Fri, 17 Sep 2021 00:24:18 +0900

I only recently noticed that Raspberry Pi OS has a 64-bit version, so I will install it on a Raspberry Pi 4. As usual, this assumes no keyboard, mouse, or display is connected to the Raspberry Pi.

Like when installing Ubuntu, this records the steps up to installing the OS and logging in from the host PC (Windows) over SSH. This time I use an SSD for storage instead of an SD card.

[Raspberry Pi 4] Install Docker on the 64-bit Version of Raspberry Pi OS

Tue, 14 Sep 2021 13:51:47 +0900

This is a memo. It is the same procedure as installing on Ubuntu. The repository URL is about the only difference.

Test Environment

Raspberry Pi 4, 8GB memory
*On this site, I use a SanDisk SSD and a Buffalo SSD for storage. (Reference: [Raspberry Pi 4] Change the Pi 4 Storage from an SD Card to an SSD)

[Raspberry Pi] Configure Ubuntu Server Wi-Fi from CUI Commands

Mon, 13 Sep 2021 18:22:14 +0900

Overview

This is a note from installing Ubuntu Server on a Raspberry Pi, connecting a display and keyboard, and configuring Wi-Fi. With the Desktop edition, you can configure it from the GUI, so you probably do not need to do it from commands.

If you want to install and configure it without connecting a display or keyboard, see "[Raspberry Pi 4] Headless Install of Ubuntu Server 21.04 (No Monitor or Keyboard) Beginner-Friendly".

[Raspberry Pi 4] Increase the Memory Allocated to the GPU

Thu, 09 Sep 2021 17:50:49 +0900

Overview

The Raspberry Pi GPU memory is shared with system memory.

I checked how to change the amount of memory allocated to the GPU.

Test Environment

Raspberry Pi 4 with 8GB RAM, running Ubuntu.

$ cat /proc/device-tree/model Raspberry Pi 4 Model B Rev 1.4

$ lsb_release -a No LSB modules are available. Distributor ID: Ubuntu Description: Ubuntu 21.04 Release: 21.04 Codename: hirsute

Configuration

Check the current GPU memory size. By default, the allocation to the GPU seems to be 76MB.
There is plenty of system memory available, so I will increase the GPU allocation.

[Raspberry Pi 4] Change the Pi 4 Storage from an SD Card to an SSD

Thu, 05 Aug 2021 00:59:23 +0900

When using a Raspberry Pi as a home server, you inevitably have to worry about the life of the SD card. Raspberry Pi 4 can also boot from a USB drive, so I tried it.
As a result, it now runs snappily and feels comfortable. It also removes the problem of SD cards failing from periodic log writes and similar activity, which makes operation easier.

Test Environment

Raspberry Pi 4 8GB

Building a Compact Desktop PC with the Popular ASRock DeskMini Barebone Kit

Mon, 12 Jul 2021 19:19:26 +0900

Overview

I built a compact, quiet PC. I could have bought Dospara's mini Regulus II AR5, but I already had an OS and SSD on hand, and I was able to buy memory cheaply on Mercari, so this time I bought an ASRock DeskMini X300 barebone kit and assembled it myself.

The photos show the finished build. The front panel is just a little larger than an iPhone 8.

If you want something even more compact and low-power, ASUS's Mini PC PN51 looks good. If you do not want to build one yourself, I think buying a finished mini PC such as Dospara's mini Regulus is probably the way to go.

[Emacs] I Tried nyan-mode

Wed, 30 Jun 2021 13:00:33 +0900

I want to try LSP-mode, and when I read Emacs Modernization Plan - Cute Emacs Edition -, it introduced a lot of useful things, so I decided to try them little by little in my own environment.

The first thing that catches the eye is the cat in the mode line. It seems to be called nyan-mode. Instead of showing your position in the buffer as a percentage, the cat shows roughly where you are.

[Raspberry Pi 4] Four-Channel Simultaneous Terrestrial Digital TV Recording Server on Ubuntu with PX-Q1UD

Sat, 19 Jun 2021 00:21:28 +0900

These are notes. I tried something called a recording server. Since I already had a Docker environment, it was easy to create. I also tried hardware encoding, but it was not stable, so these notes only cover building the normal setup. This is amateur work, so if you use it as a reference, do so at your own risk.

Update: In a separate article, I wrote about operating it with H/W encoding.
[Raspberry Pi 4] [Redo] Four-channel simultaneous terrestrial digital TV recording server on Raspberry Pi

[Raspberry Pi 4] Install Docker on Ubuntu Server 21.04

Tue, 08 Jun 2021 02:10:55 +0900

This is a memo. Since Ubuntu Hirsute 21.04 is already installed on the Raspberry Pi, installing Docker only requires following the procedure on the official site.

Test Environment

Raspberry Pi 4, 4GB memory

Ubuntu Server 21.04

Install Docker

# 旧バージョン等のクリーンアップ
$ sudo apt-get remove docker docker-engine docker.io containerd runc

# Set up the repository
$ sudo apt-get update
$ sudo apt-get install -y 

apt-transport-https 

ca-certificates 

curl 

gnupg 

lsb-release



[Raspberry Pi 4] Headless Installation of Ubuntu Server 21.04 Over Wi-Fi Only (No Monitor or Keyboard) 🐣 Beginner-Friendly 🐣
Mon, 07 Jun 2021 11:48:41 +0900
I got a 4 GB memory version of the Raspberry Pi 4, so I tried a headless installation of Ubuntu Server 21.04. For now, I will record the steps from installing the OS to logging in by SSH from the host PC.
Environment Tested
Raspberry Pi 4, 4 GB memory
Transcend microSD 128GB










Write the Ubuntu Image to the SD Card
Prepare the environment on the host PC.
Write Ubuntu to the SD card from Windows, Mac, or Linux.


Trying an ahamo (docomo) SIM with Speed Wi-Fi HOME L02 / NEXT W06
Mon, 12 Apr 2021 22:17:58 +0900
I canceled WiMAX 2+ because using an ahamo SIM seemed cheaper, so I tried whether an ahamo SIM could be used with Speed Wi-Fi HOME L02 / NEXT W06.
Background
When there is less than a year left before the contract renewal, WiMAX 2+ recommends another three-year contract renewal under the premise of changing the Wi-Fi router model and making the device fee free.
However, with mobile carriers competing to lower data communication prices, I do not feel eager to renew for three years just because the monthly fee becomes a little cheaper and I can get a new device.


[Emacs] After Trying Mew in Emacs 27 on Windows 10, I Wanted to Display X-Face Too
Wed, 24 Mar 2021 02:06:38 +0900
This drifted a little off track, but while I was migrating my home mail server, I also configured Emacs so I could read and write email there.
Test Environment
Windows 10 Pro version 20H2 (OS build 19042.868)
64-bit GNU Emacs 27.1 official build
"GNU Emacs 27.1 (build 1, x86_64-w64-mingw32) of 2020-08-22"
Mew 6.8 Windows
Overview
I use Mew as the mailer in Emacs. I have not used anything else. I think there was also something called Wanderlust. These days, I almost never read or write email in Emacs anymore. Still, back when email was the main communication tool, being able to write email in Emacs felt deeply impressive.


[Raspberry Pi] I Thought /var/log Was Safe on a Ramdisk, but Docker Logs Were Being Written to the SD Card
Tue, 23 Mar 2021 00:01:29 +0900
To extend the life of the SD card, I configured /var/log to live on a Ramdisk. But Docker logs are output to /var/lib/docker/containers, so of course that did nothing for Docker logs.
Test Environment
Raspberry Pi 4 (8GB RAM)
Ubuntu 20.10 64-bit
$ cat /etc/fstab
LABEL=writable / ext4 defaults 0 0
LABEL=system-boot /boot/firmware vfat defaults 0 1
tmpfs /tmp tmpfs defaults,size=128m 0 0
tmpfs /var/tmp tmpfs defaults,size=128m 0 0
tmpfs /var/log tmpfs defaults,size=64m 0 0
What I Changed
Change Docker's logging driver settings. Check the official site for details.
Reference: Configure logging drivers


[Raspberry Pi] After Setting Up a Ramdisk, nginx Stopped Starting, So I Handled It with rc-local
Fri, 19 Mar 2021 08:06:00 +0900
This is just about trying an earlier article, [Ubuntu] After Setting Up a Ramdisk on Raspberry Pi, nginx and MySQL Stopped Starting, So I Handled It with rc-local, on a Raspberry Pi 4 as well. These days MySQL runs in a Docker container, so the only target this time is /var/log/nginx.


[Raspberry Pi 4] Run WordPress with Docker
Sat, 13 Mar 2021 13:19:49 +0900
Overview
These are notes from setting up WordPress with Docker. Nginx is already running on the host side, and an SSL certificate has already been obtained, so WordPress will ride on that setup too.
Related Past Articles
Connect with PPPoE on Ubuntu 19.10 and open ports.
[RaspberryPi] I switched from Docomo Hikari to Nuro Hikari, so I stopped using PPPoE and changed to normal port forwarding
[Raspberry Pi 4] Headless installation of Ubuntu 20.10. How to install without a keyboard or display
[Raspberry Pi 4] Install Nginx and obtain an SSL server certificate from Let's Encrypt
[Raspberry Pi 4] Build a mail server with Docker. 
[Raspberry Pi 4] Run WordPress with Docker. ★ You are here
Environment Tested
Raspberry Pi 4 Ubuntu 20.10 (arm64)


[Raspberry Pi] After Switching from docomo Hikari to NURO Hikari, I Stopped PPPoE and Switched to Normal Port Forwarding
Fri, 12 Mar 2021 21:08:17 +0900
As the title says, NURO Hikari lets me open ports without particular restrictions, so I stopped PPPoE on the Raspberry Pi and exposed it externally using the ONU settings.
Overview
The flow is roughly like this.
Remove the PPPoE settings and change the network settings.
Configure the DMZ on the ONU (SGP200W).
Shut down the Raspberry Pi, then change the connection from the docomo Hikari TA to the NURO Hikari ONU.
Start the Raspberry Pi.
The target Raspberry Pi is used for the following purpose.
[Raspberry Pi 4] Build a Mail Server (Postfix + Dovecot) with Docker
(*Actually, with the settings above, I had been running it without noticing that unintended ports were open.)


[Raspberry Pi 4] Build a Mail Server (Postfix + Dovecot) with Docker
Tue, 02 Feb 2021 09:55:54 +0900
This time, I use Docker to start a mail server and handle the various settings around it.
Overview
I use Postfix and Dovecot for my home mail server, but when installed as native packages, the initial configuration is complicated. When rebuilding the server or moving it to another PC, I completely forget what was configured and how. On top of that, I also need to configure other tools such as spam countermeasures and Fail2Ban, so it is a real hassle. This time the goal is an easy installation using Docker.


[Emacs] Try Configuring Fonts in Emacs 27 on Windows 10
Sun, 31 Jan 2021 23:13:52 +0900
When using Emacs, it feels wrong if the fonts are not configured.
I do not really understand the proper way to configure them, but I searched around and tried settings that suit me reasonably well.
Test Environment
Windows 10 Pro version 20H2 (OS build 19042.746)
64-bit GNU Emacs 27.1 official build
"GNU Emacs 27.1 (build 1, x86_64-w64-mingw32) of 2020-08-22"
Overview
The default state is hard to read, so I will start by configuring only the basic fonts. That said, I personally do not understand Emacs font configuration very well.


[Raspberry Pi 4] Install Nginx and Obtain an SSL Server Certificate from Let's Encrypt
Sat, 23 Jan 2021 17:54:14 +0900
Overview
Since I installed Ubuntu 20.10 on a Raspberry Pi 4, I migrated the mail server and WordPress running on my current home server over to the Raspberry Pi. These are my notes.
Environment Tested
Raspberry Pi 4 Ubuntu 20.10 (arm64)
$ nginx -v
nginx version: nginx/1.18.0 (Ubuntu)
$ certbot --version
certbot 1.11.0
Prerequisites and Preparation
Complete the Ubuntu installation, PPPoE settings, and domain settings in advance. This is the same as what I did previously on the Pi 3, so I will omit the details.


[Emacs] Use Emacs 27 on Windows 10
Wed, 20 Jan 2021 00:06:24 +0900
To use Emacs on Windows, GNU's official build was effectively hard to use, and comfortable Japanese input required a community build with the IME patch. I am truly grateful for those builds up to now.
This time, W32-IME became easy to use even with the official build, so I tried it.
Test Environment
Windows 10 Pro version 20H2 (OS build 19042.746)
64-bit GNU Emacs 27.1 official build
"GNU Emacs 27.1 (build 1, x86_64-w64-mingw32) of 2020-08-22"


[Raspberry Pi 4] Headless Installation of Ubuntu 20.10: Installing Without a Keyboard or Display
Tue, 12 Jan 2021 08:07:00 +0900
Overview
This is about installing Ubuntu 20.10 on a Raspberry Pi 4. I did not have a MicroHDMI cable, so I installed and performed the initial setup without connecting a keyboard or display.
I install Ubuntu and make it possible to log in by SSH from a PC, while using the Cloud-init (user-data) mechanism so that as little work as possible is needed after boot.
In a previous article, after installing and booting Ubuntu, various settings still had to be done. This procedure automates that part: [Raspberry Pi 3] Installing Ubuntu 18.04 LTS (no keyboard or display required)


How to Change the Search Engine in the New Chromium-Based Microsoft Edge from Bing to Google
Mon, 27 Jul 2020 19:11:58 +0900
Microsoft Edge became Chromium-based, so I have been trying it out. For now, searching with Bing feels odd to me, so this is about changing the default search engine from Bing to Google.

Test Environment
Windows 10 Pro 2004 OS build 19041.388
Microsoft Edge version 84.0.522.44 (Official build) (64-bit)
Steps
Open Settings from the menu in the upper-right corner of Edge.

Select Privacy and services, then click Address bar at the very bottom of the right pane.


[Windows] How to Move Docker Desktop's Disk Space from the C Drive to Another Drive
Wed, 15 Jul 2020 14:59:30 +0900
Since WSL2 became available, I decided to try Docker on Windows too. When Docker Desktop is installed, it automatically creates its virtual environment on the C drive. My C drive started running low on free space, so I moved the Docker environment to the D drive.
Test Environment
Windows 10 Pro 2004 OS build 19041.329
Docker Desktop community 2.3.0.3
WSL2 (Windows Subsystem for Linux)

In Docker Desktop settings, I have WSL2 Integration enabled. Since I use Ubuntu 20.04 as the WSL distribution, integration with that distribution is also enabled. 


[Ubuntu] After Setting Up a Ramdisk on Raspberry Pi, nginx and MySQL Stopped Starting, So I Handled It with rc-local
Tue, 05 May 2020 09:16:00 +0900
To extend the life of the Raspberry Pi SD card, I made /var/log a Ramdisk, and then nginx and MySQL stopped starting. The cause was simple: directories such as /var/log/nginx and /var/log/mysql did not exist when the processes started.
When trying this on a Raspberry Pi 4: [Raspberry Pi] After Setting Up a Ramdisk, nginx Stopped Starting, So I Handled It with rc-local


[Raspberry Pi] apt Started Failing After I Put tmp on a Ramdisk
Sun, 03 May 2020 12:03:34 +0900
I configured a Ramdisk to extend the life of the SD card.
After that, when I upgraded the kernel with apt, an error occurred because /var/tmp did not have enough capacity.
I did not record the error message, but I think it was No space left on device.
I handled it by setting larger sizes for /var/tmp and similar directories.
$ cat /etc/fstab
LABEL=writable / ext4 defaults 0 0
LABEL=system-boot /boot/firmware vfat defaults 0 1
tmpfs /tmp tmpfs defaults,size=128m 0 0
tmpfs /var/tmp tmpfs defaults,size=128m 0 0
tmpfs /var/log tmpfs defaults,size=64m 0 0
The site I used as a reference for extending the SD card life set /var/tmp to 16MB, and anyone who copied that as-is will probably run into the same thing.


[Emacs] Cannot Send Mail with Mew 6.8 on Windows 10
Sat, 04 Apr 2020 09:33:52 +0900
When I tried using Mew on Windows, I got stuck sending mail through the submission port.
Even when I wrote an email in Mew and sent it with C-c C-c, it froze at "Creating an SSL/TLS connection...". The smtpd log also showed something like "smtpd lost connection after STARTTLS from xxx".
Cause
I found information from someone who had already solved this and fixed it.
When using STARTTLS, specify both smtp-ssl-port and smtp-port.


[WordPress] Change VCCW's PHP Version to 7.4
Fri, 03 Apr 2020 12:25:13 +0900
The VCCW environment I use to verify WordPress behavior had a different PHP version from production, so I aligned them.
Method
Change the PHP version installed in VCCW
The author of VCCW provides the method, so I followed it.
To apply it to an already running VCCW environment, log in to the guest OS with vagrant ssh and run the following command.


[Raspberry Pi 3] Initial Ubuntu Settings on Raspberry Pi, Including How to Change the Hostname
Sun, 15 Mar 2020 00:27:03 +0900
A memo series for Raspberry Pi-related work. This continues the initial setup: changing the hostname, setting a static IP address, and creating a swap file.
Test Environment
Raspberry Pi 3
Ubuntu 18.04.04 LTS 32-bit
Change the Hostname
$ sudo hostnamectl set-hostname rpi3.nosubject.io
Configure a Static IP Address
I wrote about configuring this from a PC before booting in [Raspberry Pi 3] Installing Ubuntu 18.04 LTS (No Keyboard or Display Required), but if you are already logged in to Ubuntu, do the following.


[Raspberry Pi 3] How to Change Only the Ubuntu Username Without Changing the User ID (uid)
Sat, 14 Mar 2020 20:09:17 +0900
This continues from [Raspberry Pi 3] Installing Ubuntu 18.04 LTS (No Keyboard or Display Required).
Leaving the user and password as ubuntu/ubuntu is dangerous, so this is about changing them for now.
Creating a new user and then deleting the ubuntu user would be fine too, but I tried changing only the name while keeping uid=1000 and gid=1000.
Test Environment
Raspberry Pi 3
Ubuntu 18.04.04 LTS 32-bit
How to Do It
You need to log in as root before doing the work, so it may be a little more troublesome than adding a new user and deleting the ubuntu user.


[Raspberry Pi 3] Installing Ubuntu 18.04 LTS (No Keyboard or Display Required)
Sat, 14 Mar 2020 14:04:21 +0900
A memo from setting up a home server on a Raspberry Pi.
This covers installing Ubuntu on the Raspberry Pi and logging in from a PC over SSH.
Update: I wrote the memo from trying this on a Raspberry Pi 4 here.[Raspberry Pi 4] Headless Install of Ubuntu 20.10: How to Install Without a Keyboard or Display


Export PuTTY / Pageant Settings and Use Them on Another PC
Fri, 06 Mar 2020 00:58:13 +0900
PuTTY does not have an export feature for settings, so when you switch PCs you may wonder what to do. PuTTY settings are stored in the registry, so you can extract them and move them over.
How to Do It
Open Command Prompt and run "reg export HKEY_CURRENT_USER\Software\SimonTatham\PuTTY\Sessions Putty.reg" (administrator privileges are not required). The part after the space at the end is the output file name, so you can name it whatever you like.
In this case, a file named Putty.reg is created, so copy it to the destination PC.


Use Emacs on Windows 10
Thu, 05 Mar 2020 11:25:55 +0900
It seems inline IME display is possible even with the official build, but for now the following build is more comfortable to use. It supports W32-IME.
mhatta/emacs-26-x86_64-win-ime
Update: Starting with Emacs 27, W32-IME can also be used with GNU's official build.
[Emacs] Use Emacs 27 on Windows 10
I swap Caps and Ctrl with ChangeKey. It is old, but it still works. (There may already be a generation that does not know LZH.)
http://satoshi3.sakura.ne.jp/f_soft/dw_win.htm 


I Tried Customizing What Emacs Shows in the Title Bar
Sat, 29 Feb 2020 08:07:00 +0900
After I started opening remote files with Tramp, I wanted a quick way to tell which host the file I was editing belonged to. I found someone who had written a useful article, so I tried applying the same setting to my Emacs.
Configuration
I used the settings described on this page. Much appreciated.
Show the time and file name in the Emacs title bar
With settings like this, the full path of the file is displayed in the title bar. The time is shown too.
For files opened remotely, the path includes the host name, so this works well with Tramp.


How to Directly Edit Ubuntu or CentOS Files from Emacs for Windows - Emacs Tramp
Fri, 28 Feb 2020 14:19:52 +0900
I use Ubuntu and CentOS with VirtualBox + Vagrant. Sometimes I need to edit files such as Java, JavaScript, or CSS files, and installing Emacs in a VM just for that felt tedious. Even if installed, an unconfigured Emacs does not feel very good to use.
Configuration
To edit files remotely from Emacs, use a mechanism called TRAMP. If the environment is accessible over SSH, you can edit files with the same feel as editing local files on Windows.


Install tmux on CentOS 6
Sun, 23 Feb 2020 03:10:05 +0900
This is a note from when I installed tmux on a CentOS 6 minimal VM. If you run `yum` without thinking about it, you get Error: Nothing to do because the package is not available. If you just want to install tmux quickly and do not mind that the version is a little old, the following is enough.
Installation
Install it with yum.
$ sudo yum install epel-release
...
$ sudo yum install tmux
…
Package Arch Version Repository Size
Installing:
tmux x86_64 1.6-3.el6 epel 208 k


WordPress: How to Paste Code Between the  and  Tags in the Cocoon Child Theme
Sun, 23 Feb 2020 00:19:05 +0900
I use the Cocoon Child theme. I did not know how to put the Google Adsense code inside the <head> tag, so I looked it up.
*Update: You can now change this from the settings screen, so I added notes about that too.
Configuration
In the WordPress dashboard, open Appearance -> Theme Editor.
From the theme file list on the right, select tmp-user -> head-insert.php.
At the bottom there is a line that says <? //全ての訪問者をカウントする場合は以下に挿入 ?>. Paste the code you want to insert below that line.
Press the Update File button at the bottom of the screen, and you are done.

head-insert.php Configuration Example
<?php
//ヘッダー部分（<head></head>内）にタグを挿入したいときは、このテンプレートに挿入（ヘッダーに挿入する解析タグなど）
//子テーマのカスタマイズ部分を最小限に抑えたい場合に有効なテンプレートとなります。
//例：<script type="text/javascript">解析コード</script>
?>
<?php if (!is_user_administrator()) :
//管理者を除外してカウントする場合は以下に挿入 ?>
<?php endif; ?>
<?php //全ての訪問者をカウントする場合は以下に挿入 ?>
<script data-ad-client=“ca-pub-XXXXXXX” async src=“https://pagead2.googlesyndication.com/pagead/js/adsbygoogle.js"></script>



I Tried Using the Relaxed Kosugi Maru Web Font (Google Font) in a WordPress Theme
Sat, 22 Feb 2020 21:26:55 +0900
I tried configuring a web font in WordPress. This time I used Kosugi Maru from Google Fonts.
The theme for this site is Cocoon Child, but I think the basics are the same for other themes.
No additional plugins are required.
Configuration
Open Appearance -> Customize -> Additional CSS from the dashboard.
There is an input area on the left, so add the font settings there.
A preview is displayed as soon as you enter it, which makes it easy to see what changed.

Configuration Example
This time I configured it as follows.
The only key points are "fetch the font with @import" and "apply it to the style with font-family:", so the setup is simple.


Comfortable BGM for Keyboard Fans
Tue, 10 Dec 2019 23:42:00 +0900

 
 
 
 
 
 
 
 https://www.youtube.com/watch?v=fpwVavmNEbA
 リンク先を開く
 www.youtube.com
 
 



This is the official HHKB ASMR.
If you play it on loop, it makes you feel as if you are working briskly too.
ASMR = Autonomous Sensory Meridian Response 
ASMR refers to pleasant responses and sensations, such as tingling in the brain, that people feel from auditory or visual stimuli. (Wikipedia)





Regularly Update Dynamic DNS for a Custom Domain Registered with Onamae.com from Ubuntu
Sat, 07 Dec 2019 16:05:27 +0900
I registered a domain with Onamae.com, so I set up DDNS to automatically register the IP address of my home server.
Configuration
Updating Onamae.com DDNS from a script
You can do this easily by borrowing the knowledge from the site above.
(I modified it a little for my own use.)

Set it in cron and you are done.
*/15 * * * * root /usr/local/bin/onamae.com_dns_update.py > /var/log/onamae_dns_update.log 2>&1 
Test Environment
Ubuntu 18.04
Raspberry Pi 3
Me
Thanks for the convenient script. It makes this very easy.


Add the Japanese Locale to Ubuntu 19.10
Sat, 07 Dec 2019 13:56:23 +0900
Even if you set LANG=ja_JP.UTF-8, if the locale definition does not exist you will see error messages like the following.
locale: Cannot set LC_CTYPE to default locale: No such file or directory
locale: Cannot set LC_MESSAGES to default locale: No such file or directory
locale: Cannot set LC_ALL to default locale: No such file or directory 
Add the Japanese locale with the locale-gen command.
$ sudo locale-gen ja_JP.UTF-8
You can see that it has been added.


Firewall Settings on Ubuntu 19.10
Fri, 06 Dec 2019 21:14:37 +0900
Since the machine connects directly to an external network over PPPoE, I enable the firewall.
$ sudo ufw allow 80
$ sudo ufw allow 443
$ sudo ufw limit 22
$ sudo ufw enable
I exposed the web server and SSH. SSH password login was disabled beforehand.
/etc/ssh/sshd_config
PasswordAuthentication no
Me
Check the settings with an online nmap  site or similar.


Connect with PPPoE and Open Ports on Ubuntu 19.10
Fri, 06 Dec 2019 20:51:41 +0900
This is a memo from researching what to do when I wanted to run a home server in an environment with IPv6 but could not open arbitrary ports.
If you want to run a mail server, web server, or similar, the easiest approach was to create a separate PPPoE session and expose that.
Test Environment
docomo Hikari
Provider: GMO Tokutoku BB
HGW: PR-S300HI
Wi-Fi router: WXR-1750DHP2
OS: Ubuntu 19.10 EOAN 
$ cat /etc/lsb-release
DISTRIB_ID=Ubuntu
DISTRIB_RELEASE=19.10
DISTRIB_CODENAME=eoan
DISTRIB_DESCRIPTION="Ubuntu 19.10"
Install PPPoE
$ sudo apt-get install -y pppoe pppoeconf
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following additional packages will be installed:
 ifupdown
Suggested packages:
 rdnssd xdialog
The following NEW packages will be installed:
 ifupdown pppoe pppoeconf
0 upgraded, 3 newly installed, 0 to remove and 1 not upgraded.
Need to get 149 kB of archives.
After this operation, 632 kB of additional disk space will be used.
Get:1 http://archive.ubuntu.com/ubuntu eoan/universe amd64 ifupdown amd64 0.8.35ubuntu1 [60.5 kB]
Get:2 http://archive.ubuntu.com/ubuntu eoan/universe amd64 pppoe amd64 3.12-1.2ubuntu2 [73.2 kB]
Get:3 http://archive.ubuntu.com/ubuntu eoan/universe amd64 pppoeconf all 1.21ubuntu1 [14.8 kB]
Fetched 149 kB in 2s (77.3 kB/s)
Selecting previously unselected package ifupdown.
(Reading database ... 155407 files and directories currently installed.)
Preparing to unpack .../ifupdown_0.8.35ubuntu1_amd64.deb ...
Unpacking ifupdown (0.8.35ubuntu1) ...
Selecting previously unselected package pppoe.
Preparing to unpack .../pppoe_3.12-1.2ubuntu2_amd64.deb ...
Unpacking pppoe (3.12-1.2ubuntu2) ...
Selecting previously unselected package pppoeconf.
Preparing to unpack .../pppoeconf_1.21ubuntu1_all.deb ...
Unpacking pppoeconf (1.21ubuntu1) ...
Setting up pppoe (3.12-1.2ubuntu2) ...
Setting up ifupdown (0.8.35ubuntu1) ...
Creating /etc/network/interfaces.
Created symlink /etc/systemd/system/multi-user.target.wants/networking.service → /lib/systemd/system/networking.service.
Created symlink /etc/systemd/system/network-online.target.wants/networking.service → /lib/systemd/system/networking.service.
Setting up pppoeconf (1.21ubuntu1) ...
Processing triggers for man-db (2.8.7-3) ...
Processing triggers for mime-support (3.63ubuntu1) ...
Processing triggers for systemd (242-7ubuntu3.2) ...

Configure and Connect
With one command, it handles connection settings, the first connection attempt, and automatic execution on reboot.