dch / HAProxy ACME CloudFlare integration

Last active 7 hours ago acme haproxy

See https://people.freebsd.org/~dch/posts/2026-10-08-haproxy-acme/ Modelled after https://github.com/haproxy/haproxy/blob/master/examples/lua/acme-gandi-livedns.lua

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1	-- ACME dns-01 automation via event_hdl callbacks using the Cloudflare DNS API
2	-- Requires HAProxy >= 3.5 (ACME_DEPLOY / ACME_NEWCERT lua events).
3	--
4	-- Supports CNAME delegation: if a domain maps to a delegated FQDN (e.g.
5	-- _acme-challenge.example.net CNAME <key>.example.org), TXT records
6	-- are written to the delegated target instead. The API token then only
7	-- needs Zone:DNS:Edit on example.org, never on the primary zones.
8	--
9	-- HAProxy Configuration:
10	--

dch / Sup - visualise OTP supervision trees

Last active 1 day ago

sup is a fun elixir script to visualise OTP supervision trees in real time over a browser. Download, chmod and run it. Or just watch the video for funsies.

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dch / zfs deadlock

Last active 2 weeks ago deadlock freebsd zfs

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1	PID TID COMM TDNAME KSTACK
2	0 100000 kernel - mi_switch+0x198 sleepq_switch+0xec _sleep+0x278 mi_startup+0x270 virtdone+0x70
3	0 100131 kernel softirq_0 mi_switch+0x198 sleepq_switch+0xec msleep_spin_sbt+0x14c gtaskqueue_thread_loop+0xec fork_exit+0x80 fork_trampoline+0x18
4	0 100132 kernel softirq_1 mi_switch+0x198 sleepq_switch+0xec msleep_spin_sbt+0x14c gtaskqueue_thread_loop+0xec fork_exit+0x80 fork_trampoline+0x18
5	0 100133 kernel softirq_2 mi_switch+0x198 sleepq_switch+0xec msleep_spin_sbt+0x14c gtaskqueue_thread_loop+0xec fork_exit+0x80 fork_trampoline+0x18
6	0 100134 kernel softirq_3 mi_switch+0x198 sleepq_switch+0xec msleep_spin_sbt+0x14c gtaskqueue_thread_loop+0xec fork_exit+0x80 fork_trampoline+0x18
7	0 100135 kernel softirq_4 mi_switch+0x198 sleepq_switch+0xec msleep_spin_sbt+0x14c gtaskqueue_thread_loop+0xec fork_exit+0x80 fork_trampoline+0x18
8	0 100136 kernel softirq_5 mi_switch+0x198 sleepq_switch+0xec msleep_spin_sbt+0x14c gtaskqueue_thread_loop+0xec fork_exit+0x80 fork_trampoline+0x18
9	0 100137 kernel softirq_6 mi_switch+0x198 sleepq_switch+0xec msleep_spin_sbt+0x14c gtaskqueue_thread_loop+0xec fork_exit+0x80 fork_trampoline+0x18
10	0 100138 kernel softirq_7 mi_switch+0x198 sleepq_switch+0xec msleep_spin_sbt+0x14c gtaskqueue_thread_loop+0xec fork_exit+0x80 fork_trampoline+0x18

dch / wat-ldns

Last active 1 month ago

locale-dependent output

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macOS

$ uname -a
Darwin tessier.local 25.5.0 Darwin Kernel Version 25.5.0: Tue Jun  9 22:27:52 PDT 2026; root:xnu-12377.121.10~1/RELEASE_ARM64_T8112 arm64

$ sh
sh-3.2$ cc -o wat wat.c $(ldns-config --cflags --libs) -I$(brew --prefix openssl@3)/include

sh-3.2$ LC_ALL=C ./wat

dch / .iex.exs

Last active 2 months ago

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1	IEx.configure(
2	default_prompt:
3	[
4	# ANSI CHA, move cursor to column 1. Breaks stuff.
5	# "\e[G",
6	:light_green,
7	# plain string
8	"🧪 ",
9	:white,
10	:reset

dch / smart.yml

Last active 2 months ago

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1	---
2	# an ansible role to install and configure smartmon tools for a daily check + email
3	# roles/smart/tasks/main.yml
4	- name: install smartmontools
5	pkgng:
6	state: present
7	name:
8	- sysutils/smartmontools
9	notify: restart smartd
10	tags: smart, pkg

dch / pkg-jail-bootstrap.md

Last active 2 months ago

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we have an empty dir /tmp/ajail
our system ABI (version or architecture) is not the same as the required jail version
we want to use pkg base to bootstrap the jail, in the same way as untarring base.txz would

prep

root@wintermute /tmp# uname -a
FreeBSD wintermute.skunkwerks.at 16.0-CURRENT FreeBSD 16.0-CURRENT main-n284971-da663d5377a5 GENERIC amd64

dch / Makefile

Last active 2 months ago

use on FreeBSD arm64 to build a native npm-based tailwindcss CLI

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1	BASE?=$(HOME)/src
2	TAILWIND = $(BASE)/tailwind
3	LCSS = $(BASE)/lightningcss
4	NODE_ARCH != node -p "process.arch"
5
6	.PHONY: all clean deps
7
8	all: $(TAILWIND)/.cli-built
9
10	$(TAILWIND)/node_modules: $(TAILWIND)

dch / recon_to_file.exs

Last active 2 months ago

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1	spawn(fn ->
2	log_file = "vm_top_processes.log"
3
4	loop = fn loop ->
5	timestamp = DateTime.utc_now() \|> DateTime.to_string()
6
7	top_cpu = :recon.proc_count(:redu, 5)
8	top_mailbox = :recon.proc_count(:message_queue_len, 5)
9
10	format_proc = fn {pid, value, info} ->

dch / ten64 dual 1G testing

Last active 2 months ago

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testing in recovery mode on revD

doas cu -l /dev/cuaU0 -s 115200
Connected
INFO:    checksum 0x9c5886cb
INFO:    n_ranks 2
INFO:    rank_density 0x400000000
INFO:    capacity 0x800000000