Jon's Wiki - Recent changes [en]

Hacks

Johnno — Mon, 26 Oct 2026 00:16:01 GMT

High CPU from kernel kworkers

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			== High CPU from kernel kworkers ==

			Probably ACPI interrupts, flaky BIOS firmware, drivers. If you see <code>irq/9-acpi</code> and <code>kworker/7:x+events_long</code> in top, have a look at the ACPI interrupts:

			grep -r . /sys/firmware/acpi/interrupts \| sort

			If you see a large number for <code>gpe6E</code>, try adding this to your Linux boot commandline. in <code>/etc/default/grub</code>:

			GRUB_CMDLINE_LINUX_DEFAULT="quiet splash '''acpi_mask_gpe=0x6E'''"

			and reboot.<ref>[https://bbs.archlinux.org/viewtopic.php?id=310978 Arch Linux forum]</ref>

	== Image renaming by create date ==		== Image renaming by create date ==

PHP

Johnno — Sun, 25 Oct 2026 22:19:18 GMT

Update to 8.5

MediaWiki:Citizen.css

Johnno — Sun, 25 Oct 2026 21:51:22 GMT

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	/* All CSS here will be loaded for users of the Citizen skin */		/* All CSS here will be loaded for users of the Citizen skin */
	~~--font-family-citizen-base: 'EB Garamond';~~		body {
	--font-family~~-language-base~~: ~~'EB Garamond';~~		font-family: var(--font-family-citizen-serif);
	--font-family-citizen-serif~~: 'EB Garamond'~~;		}
	~~--font-family-language-serif: 'EB Garamond';~~

Music

Johnno — Sat, 24 Oct 2026 17:07:40 GMT

Created page with "The [https://www.mediawiki.org/wiki/Extension:Score Score extension] handles snippets of music notation using [http://lilypond.org/doc/Documentation/notation/index.html Lilypond]. An excerpt from the 4th trombone part of ''Eine Alpensinfonie'' by Richard Strauss, often played on a contrabass trombone although not specifically called for: <score> \relative c, { \time 4/4 \clef bass \key c \major r2 r4\ff g\tenuto c2.\tenuto c4\tenuto g'2.\tenuto g4\tenuto c..."

New page

The [https://www.mediawiki.org/wiki/Extension:Score Score extension] handles snippets of music notation using [http://lilypond.org/doc/Documentation/notation/index.html Lilypond]. An excerpt from the 4th trombone part of ''Eine Alpensinfonie'' by Richard Strauss, often played on a contrabass trombone although not specifically called for:

<score>
\relative c, {
\time 4/4
\clef bass
\key c \major
r2 r4\ff g\tenuto
c2.\tenuto c4\tenuto
g'2.\tenuto g4\tenuto
c1
e2~ e4.. b16
a1
g1
c8 r8 r4 r2
\bar "|."
}
</score>

You can hear (but not see!) it being played in this performance by the Berlin Philharmonic. I mean, I love how they at least bothered to point the camera at the trombone section, but the only time the 4th trombonist is playing his contrabass (you can see his bass sitting on its stand), and he's not in shot: https://youtu.be/xK7z2NhUrsQ

Main Page

Johnno — Sat, 24 Oct 2026 17:07:07 GMT

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	[[Sci-Fi Night]], [[IRC Quotes]], [[FAIL]]		[[Sci-Fi Night]], [[IRC Quotes]], [[FAIL]]

	~~== Eine Alpensinfonie ==~~
	The [https://www.mediawiki.org/wiki/Extension:Score Score extension] handles snippets of music notation using [http://lilypond.org/doc/Documentation/notation/index.html Lilypond]. An excerpt from the 4th trombone part of ''Eine Alpensinfonie'' by Richard Strauss, often played on a contrabass trombone although not specifically called for:

	~~<score>~~
	~~\relative c, {~~
	~~\time 4/4~~
	~~\clef bass~~
	~~\key c \major~~

	~~r2 r4\ff g\tenuto~~
	~~c2.\tenuto c4\tenuto~~
	~~g'2.\tenuto g4\tenuto~~
	c1
	~~e2~ e4.. b16~~
	a1
	g1
	~~c8 r8 r4 r2~~
	~~\bar "\|."~~
	}
	~~</score>~~

	You can hear (but not see!) it being played in this performance by the Berlin Philharmonic. I mean, I love how they at least bothered to point the camera at the trombone section, but the only time the 4th trombonist is playing his contrabass (you can see his bass sitting on its stand), and he's not in shot:
	~~<youtube>xK7z2NhUrsQ</youtube>~~

MediaWiki:Citizen.css

Johnno — Sat, 24 Oct 2026 16:36:56 GMT

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	/* All CSS here will be loaded for users of the Citizen skin */		/* All CSS here will be loaded for users of the Citizen skin */
	--font-family-citizen-base: 'EB Garamond';		--font-family-citizen-base: 'EB Garamond';
			--font-family-language-base: 'EB Garamond';
			--font-family-citizen-serif: 'EB Garamond';
			--font-family-language-serif: 'EB Garamond';

MediaWiki:Citizen.css

Johnno — Sat, 24 Oct 2026 16:31:34 GMT

Created page with "All CSS here will be loaded for users of the Citizen skin: --font-family-citizen-base: 'EB Garamond';"

New page

/* All CSS here will be loaded for users of the Citizen skin */
--font-family-citizen-base: 'EB Garamond';

Mediawiki

Johnno — Sat, 24 Oct 2026 16:10:19 GMT

Visual Editor

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	Check [https://www.mediawiki.org/wiki/Compatibility compatibility with PHP] and install the latest version of PHP you can.		Check [https://www.mediawiki.org/wiki/Compatibility compatibility with PHP] and install the latest version of PHP you can.

	This assumes Ubuntu 20.04 ~~LTS~~, the new Mediawiki LTS version 1.35 and a passing familiarity with [[Git]]. First, some prerequisites (see the [[PHP]] page for more about how to set up PHP so it sucks less):		This assumes Ubuntu 26.04 or Debian 13 trixie, the new Mediawiki LTS version 1.43 and a passing familiarity with [[Git]]. First, some prerequisites (see the [[PHP]] page for more about how to set up PHP so it sucks less):

	apt-get install git apache2 libapache2-mod-fcgid ~~php7~~.4-curl ~~php7~~.4-fpm ~~php7~~.4-mysql curl		apt-get install git apache2 libapache2-mod-fcgid php8.4-curl php8.4-fpm php8.4-mysql curl

	~~;NOTE: MediaWiki does not (yet) work properly with PHP 8 so we use PHP 7.4 for now.~~

	Now clone Mediawiki with git:		Now clone Mediawiki with git:

	git clone <nowiki>https://~~phabricator~~.wikimedia.org/~~source~~/mediawiki~~.git~~</nowiki>		git clone <nowiki>https://gerrit.wikimedia.org/r/mediawiki/core</nowiki> mediawiki

	Next, we need to pull in PHP library dependencies with [https://getcomposer.org/download/ PHP composer]. First install composer from the download page, then use it to pull dependencies into MediaWiki:		Next, we need to pull in PHP library dependencies with [https://getcomposer.org/download/ PHP composer]. First install composer from the download page, then use it to pull dependencies into MediaWiki:
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	Now when we want an extension, say the ''Cite'' extension, we add the git submodule:		Now when we want an extension, say the ''Cite'' extension, we add the git submodule:

	git submodule add -b ~~REL1_35~~ <nowiki>https://gerrit.wikimedia.org/r/mediawiki/extensions/Cite</nowiki> extensions/Cite		git submodule add -b REL1_43 <nowiki>https://gerrit.wikimedia.org/r/mediawiki/extensions/Cite</nowiki> extensions/Cite
	git submodule update --init --recursive extensions/Cite		git submodule update --init --recursive extensions/Cite

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	== Visual Editor ==		== Visual Editor ==

	This relies on Parsoid, which used to be a separate Node.js REST service you had to install~~; in 2019 it~~ was rewritten in PHP and is now bundled since version 1.35 of MediaWiki.		This relies on Parsoid, which used to be a separate Node.js REST service you had to install, but was rewritten in PHP and is now bundled since version 1.35 of MediaWiki.

	=== Install the required MediaWiki extensions ===		=== Install the required MediaWiki extensions ===
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	Install the Visual Editor extension and its dependent extension (UniversalLanguageSelector):		Install the Visual Editor extension and its dependent extension (UniversalLanguageSelector):

	git submodule add -b ~~REL1_35~~ <nowiki>https://gerrit.wikimedia.org/r/mediawiki/extensions/VisualEditor</nowiki> extensions/VisualEditor		git submodule add -b REL1_43 <nowiki>https://gerrit.wikimedia.org/r/mediawiki/extensions/VisualEditor</nowiki> extensions/VisualEditor
	git submodule add -b ~~REL1_35~~ <nowiki>https://gerrit.wikimedia.org/r/mediawiki/extensions/UniversalLanguageSelector</nowiki> extensions/UniversalLanguageSelector		git submodule add -b REL1_43 <nowiki>https://gerrit.wikimedia.org/r/mediawiki/extensions/UniversalLanguageSelector</nowiki> extensions/UniversalLanguageSelector
	git submodule update --init --recursive extensions/VisualEditor extensions/UniversalLanguageSelector		git submodule update --init --recursive extensions/VisualEditor extensions/UniversalLanguageSelector

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	composer update --no-dev		composer update --no-dev
	git submodule update --init --recursive		git submodule update --init --recursive
	sudo -u www-data /usr/bin/php maintenance/update.php		sudo -u www-data /usr/bin/php maintenance/update.php # up to 1.39
			sudo -u www-data /usr/bin/php maintenance/run.php update # 1.40 onwards
	# (look for any new updateXXX.php commands in the maintenance directory)		# (look for any new updateXXX.php commands in the maintenance directory)

NextCloud

Johnno — Sat, 24 Oct 2026 03:44:42 GMT

Configuring Apache and PHP

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	: ''See the [[PHP]] page for setting up PHP with Apache, FPM and Event MPM.''		: ''See the [[PHP]] page for setting up PHP with Apache, FPM and Event MPM.''

			Install the most recent version PHP you can by checking the [https://docs.nextcloud.com/server/stable/admin_manual/installation/php_configuration.html PHP configuration page] in the NextCloud Administration Manual.

	=== Add a virtual host for NextCloud ===		=== Add a virtual host for NextCloud ===

Mediawiki

Johnno — Fri, 23 Oct 2026 22:57:44 GMT

Installation

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	== Installation ==		== Installation ==

			Check [https://www.mediawiki.org/wiki/Compatibility compatibility with PHP] and install the latest version of PHP you can.

	This assumes Ubuntu 20.04 LTS, the new Mediawiki LTS version 1.35 and a passing familiarity with [[Git]]. First, some prerequisites (see the [[PHP]] page for more about how to set up PHP so it sucks less):		This assumes Ubuntu 20.04 LTS, the new Mediawiki LTS version 1.35 and a passing familiarity with [[Git]]. First, some prerequisites (see the [[PHP]] page for more about how to set up PHP so it sucks less):

WordPress

Johnno — Fri, 23 Oct 2026 22:52:48 GMT

Cache all the things

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	== Optimise PHP ==		== Optimise PHP ==

			Install the latest PHP version you can; see the WordPress Handbook [https://make.wordpress.org/core/handbook/references/php-compatibility-and-wordpress-versions/ PHP compatibility page] for up-to-date information; as of October 2026, PHP 8.5 is supported by versions 7.x of WordPress.

	Use PHP-FPM and use the Opcache. See the [[PHP]] page.		Use PHP-FPM and use the Opcache. See the [[PHP]] page.
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	WordPress is slow. Fortunately, there are things we can do to make it behave more like a static site, which for 99% of the time, it may as well be.		WordPress is slow. Fortunately, there are things we can do to make it behave more like a static site, which for 99% of the time, it may as well be.

	~~First, install~~ and configure [https://wordpress.org/plugins/wp-super-cache/ WP Super Cache] to cache page content.		# Install and configure [https://wordpress.org/plugins/wp-super-cache/ WP Super Cache] to cache page content.
			# Install a Redis server, and get the [https://wordpress.org/plugins/wp-redis/#installation WP-Redis] plugin and follow its installation instructions. This hugely reduces load times by caching PHP object data and reducing calls to the database. To install a Redis server:<pre>apt install redis-server</pre>
	~~Second, install~~ a Redis server, and get the [https://wordpress.org/plugins/wp-redis/#installation WP-Redis] plugin and follow its installation instructions. This hugely reduces load times by caching PHP object data and reducing calls to the database.		# Configure Apache to gzip all the static assets, and use a long cache expiry time.
	apt ~~get~~ install redis-server

	~~Also, configure~~ Apache to gzip all the static assets and use a long cache expiry time.

	== Allow user-installed plugins and themes ==		== Allow user-installed plugins and themes ==

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	Install at least the following packages:		Install at least the following packages:

	sudo apt install apache2 libapache2-mod-fcgid php-fpm php8.3-{fpm,opcache}		sudo apt install apache2 libapache2-mod-fcgid php-fpm php8.5-{fpm,opcache}

	You'll need various PHP extensions to host a real PHP application; for example [[NextCloud]] requires PHP composer, [[PostgreSQL]], Redis, and Dehydrated is useful for managing [[Letsencrypt]] SSL certificates.		You'll need various PHP extensions to host a real PHP application; for example [[NextCloud]] requires PHP composer, [[PostgreSQL]], Redis, and Dehydrated is useful for managing [[Letsencrypt]] SSL certificates.

	sudo apt install php-{imagick,redis} \		sudo apt install php-{imagick,redis} \
	php8.3-{bcmath,bz2,curl,gd,gmp,intl~~,json~~,mbstring,pgsql,soap,tidy,xmlrpc,xsl,zip} \		php8.5-{bcmath,bz2,curl,gd,gmp,intl,mbstring,pgsql,soap,tidy,xmlrpc,xsl,zip} \
	composer postgresql redis-server dehydrated		composer postgresql redis-server dehydrated

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	Enable the required Apache configurations and modules:		Enable the required Apache configurations and modules:

	a2enconf php8.3-fpm		a2enconf php8.5-fpm
	a2enmod dir env headers http2 mpm_event proxy_fcgi rewrite setenvif ssl		a2enmod dir env headers http2 mpm_event proxy_fcgi rewrite setenvif ssl
	systemctl restart apache2		systemctl restart apache2
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	== Configure PHP ==		== Configure PHP ==

	The configuration for PHP code hosted by Apache using PHP-FPM is located under {{code\|/etc/php/8.3/fpm}}.		The configuration for PHP code hosted by Apache using PHP-FPM is located under {{code\|/etc/php/8.5/fpm}}.

	You will not be able to use mod-php {{code\|php_value}} directives in Apache configuration; either try and do without, or set environment variables instead.		You will not be able to use mod-php {{code\|php_value}} directives in Apache configuration; either try and do without, or set environment variables instead.

	PHP works a lot better with a few extra things configured. Enable the opcache, increase the memory limit, and depending on what you're hosting, increase the maximum POST size so users can upload photos and other large files. Other fun helpful things include using Redis for PHP sessions, and tuning the FPM process parameters to make stuff more efficient under load.		PHP works a lot better with a few extra things configured. Enable the opcache, increase the memory limit, and depending on what you're hosting, increase the maximum POST size so users can upload photos and other large files. Other fun helpful things include using Redis for PHP sessions, and tuning the FPM process parameters to make stuff more efficient under load; the defaults are often comically insufficient.

	=== Keep your PHP custom settings and tweaks separate ===		=== Keep your PHP custom settings and tweaks separate ===

	Since Debian/Ubuntu ~~now moves~~ files around with each new version of PHP, you can keep your customisations to the {{code\|php.ini}} file in a local configuration. For example, instead of editing {{code\|/etc/php/8.3/fpm/php.ini}}, put these settings in {{code\|/etc/php/local/php.ini}}:		Since Debian/Ubuntu move files around with each new version of PHP, you can keep your customisations to the {{code\|php.ini}} file in a local configuration. For example, instead of editing {{code\|/etc/php/8.5/fpm/php.ini}}, put these settings in {{code\|/etc/php/local/php.ini}}:

	; /etc/php/local/php.ini		; /etc/php/local/php.ini
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	Then we add a symbolic link in the {{code\|conf.d}} directory where it is needed, for example when new versions of PHP are released.		Then we add a symbolic link in the {{code\|conf.d}} directory where it is needed, for example when new versions of PHP are released.

	ln -s /etc/php/local/php.ini /etc/php/8.3/fpm/conf.d/99-local.ini		ln -s /etc/php/local/php.ini /etc/php/8.5/fpm/conf.d/90-local.ini