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iandol / change-machine-id.md
Created August 2, 2025 09:56 — forked from dllud/change-machine-id.md
How to change a cloned GNU/Linux machine's identity

How to change a cloned GNU/Linux machine's identity

You've just finished installing and configuring all those packages on your first machine. Now it's just a matter of cloning the hard drive into all the others and changing the hostname. Right?

Well, not so easy. If you wish to avoid conflicts on your network, backups and elsewhere, i.e. if you wanna end up with a unique fingerprint for each machine, you must go a few steps further.

Here follows a checklist to help you out. It's aimed at Debian and derivates (e.g. Ubuntu), though other distros won't be much different.

hostname

The old way: edit /etc/hostname and /etc/hosts

@iandol
iandol / physics2D.m
Last active January 8, 2024 09:32
Simple rigid body 2D physics of a circle in MATLAB
% Define parameters
radius = 1; % circle radius
mass = 1; % circle mass
speed = 10;
angle = deg2rad(45);
[xv,yv]=pol2cart(angle,speed);
initialPosition = [-7, -7]; % initial position (x, y)
initialVelocity = [xv, yv]; % initial velocity (vx, vy)
timeStep = 0.1; % time step
simulationTime = 10; % total simulation time
@iandol
iandol / imrec.m
Last active December 27, 2023 06:49
Create stimulus frame movie from a previous opticka experiment.
% This script loads a previous opticka experiment, then uses the screen and
% stimulus and task values to generate a series of movies or pictures for
% each stimulus frame. This assumes a single variable (i.e. angle). It runs
% 0.25 only showing fixation cross, then 1.5 secs of the stimulus, then
% another 0.25 seconds blank.
%%
% lets load from the saved MAT file
[mat,p] = uigetfile('*.mat','Select the Experiment MAT file');
if isnumeric(mat); return; end
@iandol
iandol / log.txt
Created October 25, 2023 01:21
64bit Debian 12 Raspberry Pi 4 VBLSyncTest Log
>> Screen('Preference','verbosity',10)
ans = 3
>> VBLSyncTest
RandR: 1920x1080 (0x47) 148.5MHz
h: width 1920 start 2008 end 2052 total 2200 skew 0
v: height 1080 start 1082 end 1087 total 1125
PTB-INFO: This is Psychtoolbox-3 for GNU/Linux X11, under GNU/Octave 64-Bit (Version 3.0.19 - Build date: Oct 16 2023).
PTB-INFO: OS support status: Linux 6.1.0-rpi4-rpi-v8 Supported.
@iandol
iandol / setup.sh
Created May 20, 2023 11:04
micromamba setup for shell -- micromamba shell hook -s zsh -p ~/micromamba
# Copyright (C) 2012 Anaconda, Inc
# SPDX-License-Identifier: BSD-3-Clause
__mamba_exe() (
"$MAMBA_EXE" "$@"
)
__mamba_hashr() {
if [ -n "${ZSH_VERSION:+x}" ]; then
\rehash
@iandol
iandol / 32bit.log
Created December 8, 2022 01:29
PTB (git a6edbf2) + Raspberry Pi 4 8GB — 32bit vs. 64bit OS comparison for VBLSyncTest at Verbosity = 10 — OS is updated as of 2022-12-08
>> Screen('Preference','Verbosity',10)
ans = 3
>> VBLSyncTest
RandR: 1920x1080 (0x48) 148.5MHz
h: width 1920 start 2008 end 2052 total 2200 skew 0
v: height 1080 start 1084 end 1089 total 1125
PTB-INFO: This is Psychtoolbox-3 for GNU/Linux X11, under GNU/Octave 32-Bit (Version 3.0.18 - Build date: Aug 4 2022).
PTB-INFO: OS support status: Linux 5.15.76-v7l+ Supported.
@iandol
iandol / lazypirateclient.py
Created February 19, 2022 14:28
Lazypirate server / client test
#
# Lazy Pirate client
# Use zmq_poll to do a safe request-reply
# To run, start lpserver and then randomly kill/restart it
#
# Author: Daniel Lundin <dln(at)eintr(dot)org>
#
import itertools
import logging
import sys
@iandol
iandol / Client log [ERROR]
Created February 19, 2022 12:19
Trying to get this demo code working: https://abhitronix.github.io/vidgear/latest/help/netgear_ex/#using-netgear-with-webgear — I get a client error about ZMQ. Running the basic ZMQ REP/REQ code works over the same network address+port
❯ python client.py
12:08:59 :: Helper :: INFO :: Running VidGear Version: 0.2.5
12:08:59 :: Helper_Async :: DEBUG :: Found valid WebGear data-files successfully.
12:08:59 :: WebGear :: DEBUG :: `/Users/ian/.vidgear/webgear` is the default location for saving WebGear data-files.
12:08:59 :: WebGear :: WARNING :: Given source is of NoneType. Therefore, JPEG Frame-Compression is disabled!
12:08:59 :: WebGear :: DEBUG :: Initiating Video Streaming.
12:08:59 :: WebGear :: DEBUG :: Running Starlette application.
INFO: Started server process [17175]
INFO: Waiting for application startup.
INFO: Application startup complete.
@iandol
iandol / kill -SEGV output
Created December 11, 2021 20:54
Elvish V0.18.0-dev.95baad069e3939c0eb059518ee55224f624e01f9 crash
> test
fatal error: unexpected signal during runtime execution
[signal SIGSEGV: segmentation violation code=0x1 addr=0xb01dfacedebac1e pc=0x7ff80ea95506]
runtime stack:
runtime: unexpected return pc for runtime.sigpanic called from 0x7ff80ea95506
stack: frame={sp:0x7ff7bfeff168, fp:0x7ff7bfeff1b8} stack=[0x7ff7bfeef528,0x7ff7bfeff4c0)
0x00007ff7bfeff068: 0x01007ff7bfeff088 0x0000000000000004
0x00007ff7bfeff078: 0x000000000000001f 0x00007ff80ea95506
0x00007ff7bfeff088: 0x0b01dfacedebac1e 0x0000000000000001
@iandol
iandol / [1] Request: POST - eutils.ncbi.nlm.nih.gov - \entrez\eutils\esearch.fcgi
Created August 14, 2021 08:43
2 Requests from eutils.ncbi.nlm.nih.gov
POST /entrez/eutils/esearch.fcgi?tool=bookends&[email protected]&cmd=Search&db=pubmed&term=%2210.1016%2Fj.neuron.2014.06.003%22%5Bdoi%5D&retstart=0&retmax=1&doptcmdl=xml HTTP/1.1
Host: eutils.ncbi.nlm.nih.gov
Accept: */*
Connection: keep-alive
Cookie: ncbi_sid=1ADA87F701B058A8_ADDBSID
User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_14_6) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/13.0 Safari/605.1.15
Accept-Language: en-us
Content-Length: 0
Accept-Encoding: gzip, deflate, br