Domenico Lupinetti Ostico

Keybase proof

I hereby claim:

I am ostico on github.
I am ostico (https://keybase.io/ostico) on keybase.
I have a public key ASBfbyMT0Msc0514ycsCd1gMb-kfWTDNyP-_MeB8nJ75ygo

To claim this, I am signing this object:

How to use a custom `resolv.conf` file with systemd-resolved in Ubuntu

Stages

Disable and stop the systemd-resolved service:
```
sudo systemctl stop systemd-resolved
```
Then put the following line in the [main] section of your /etc/NetworkManager/NetworkManager.conf:

Give your host access to Docker containers with macvlan

Let's assume you have a macvlan interface running.

#$ docker network inspect test_loc-macvlan

[

Developer Workstation Setup Recipe

OpenCode + Signet Memory + Oh-My-OpenAgent + Local MCP Tooling

Target: Ubuntu 24.04 LTS (or any Debian-based Linux) / macOS 14+ (Sonoma/Sequoia)
Windows: via WSL recommended — see Windows appendix for native
Audience: Junior developers comfortable with the terminal
Time: ~30 minutes
Tested versions: Node 22, OpenCode 1.4.22, Oh-My-OpenAgent 3.17.5, Signet 0.108.0, uv 0.11.1, Python 3.13

Developer Workstation Backup & Restore Recipe

Back up your AI-assisted development environment and restore it on a fresh machine

Prerequisite: The target machine must have completed developer-workstation-setup.md before restoring
Target: Ubuntu 24.04 LTS / macOS 14+ (same platforms as the setup recipe)
Time: ~5 minutes backup, ~10 minutes restore
Tested with: Signet 0.98.7, OpenCode 1.4.3, Oh-My-OpenAgent 3.12.3

	<?php
	/**
	* @author Domenico Lupinetti ostico@gmail.com
	* Date: 11/04/16
	* Time: 19.52
	*
	* The try block is executed but the comparison are made on Exporter::toArray()
	* and if the object has no properties $expected and $actual are equals but refers to two different instances
	* ( tried with PDO as example )
	*

	<?php

	/**
	* Get the char code from a multi byte char
	*
	* 2/3 times faster than the old implementation
	*
	* @param $mb_char string Unicode Multibyte Char String
	*
	* @return int

	# maximum capability of system
	user@ubuntu:~$ cat /proc/sys/fs/file-max
	708444

	# If this limit is too low, you can increase the available limit to say 200000
	user@ubuntu:~$ sudo vim /etc/sysctl.conf

	# add the following line to it
	fs.file-max = 200000

	#!/bin/bash

	#
	# copy this into /etc/profile.d/instance-name-tag.sh
	#
	# you will need:
	# - curl, jq, and aws cli installed
	# - an IAM role that gives the EC2 instance access to describe tags
	#

	#!/bin/bash
	ps -ylC apache2 --sort:rss \| awk '{sum+=$8; ++n} END {print "Tot="sum"("n")";print "Avg="sum"/"n"="sum/n/1024"MB"}'