Pocket Theories

aiml

Anonymous (anonymous@undisclosed.example.com) — 2025-12-21T06:46:44+00:00

Artificial Intelligence / Machine LEarning TODO (Piper text-to-speech, Ollama, ComfyUI, OpenWebUI, n8n) YouTube videos: * All Machine Learning algorithms explained in 17 minutes, by Infinite Codes * How to predict the future with Python (forecasting tutorial), by Dave Ebbelaar

amazoncomputerhardwareandelectronics

Anonymous (anonymous@undisclosed.example.com) — 2025-12-21T14:14:08+00:00

Amazon Computers and Electronics Amazon India * Ambrane USB type-A to type-C 1.5m braided cable for INR.149 (2025-12-21) * Portronics USB type-A to type-C 1.2m braided cable for INR.119 (2025-12-21) * Ambrane USB type-C to type-C 1.5m braided cable for INR.149 (2025-12-21) * Ambrane 65W charger 2x USB-C, 1x USB-A for INR.1,899 (2025-12-21) * Ambrane 65W Charger 2xUSB-C, 2xUSB-A, 2xAC 1m for INR.1,999 Amazon UAE * NiPoGi Mini PC - 7430U CPU, 16GB RAM, 512GB SATA M2 SSD, Windows 11…

ansible

Anonymous (anonymous@undisclosed.example.com) — 2026-03-01T18:14:38+00:00

Ansible Installing RHEL has ansible-core, podman, and ansible-navigator in the OS repositories. Ubuntu needs a PPA: sudo add-apt-repository --yes --update ppa:ansible/ansible sudo apt install ansible -y It can also be installed with Python sudo apt install python3-pip -y pip3 install ansible

aws

Anonymous (anonymous@undisclosed.example.com) — 2026-03-01T19:34:58+00:00

AWS Fetching EC2 Metadata TOKEN=`curl -X PUT "http://169.254.169.254/latest/api/token" -H "X-aws-ec2-metadata-token-ttl-seconds: 21600"` && curl -s -H "X-aws-ec2-metadata-token: $TOKEN" http://169.254.169.254/latest/meta-data The above will give you the metadata fields that are available - append to the

bash

Anonymous (anonymous@undisclosed.example.com) — 2026-03-01T19:26:16+00:00

bash untilfail script Repeatedly run a command until failure (source) #!/bin/bash while "$@"; do :; done

bind

Anonymous (anonymous@undisclosed.example.com) — 2026-03-16T16:50:48+00:00

Minimal Config /etc/named.conf options { directory "/var/cache/bind"; dnssec-validation auto; listen-on-v6 { any; }; # allow-query { any; }; # allow-recursion { any; }; # forwarders { 1.1.1.1; }; }; zone "example.local" { type master; file "/etc/bind/db.example_local"; };

diff

Anonymous (anonymous@undisclosed.example.com) — 2026-03-01T19:22:48+00:00

diff diff -u file1.txt file2.txt > file2.patch # "-u" is for a unified diff format patch -l file2.txt file2.patch # "-l" is to ignore whitespace differences Diff can ignore whitespaces with “-w”.

docker

Anonymous (anonymous@undisclosed.example.com) — 2026-04-27T08:50:04+00:00

Installing Debian apt update apt remove docker docker-engine docker.io containerd runc apt install -y apt-transport-https ca-certificates curl gnupg lsb-release curl -fsSL https://download.docker.com/linux/debian/gpg | sudo gpg --dearmor -o /usr/share/keyrings/docker-archive-keyring.gpg echo "deb [arch=$(dpkg --print-architecture) signed-by=/usr/share/keyrings/docker-archive-keyring.gpg] https://download.docker.com/linux/debian $(lsb_release -cs) stable" | tee /etc/apt/sources.list.d/docker.l…

dokuwiki

Anonymous (anonymous@undisclosed.example.com) — 2025-11-11T17:57:32+00:00

* Installing DokuWiki on 32-bit Debian

eventmachine

Anonymous (anonymous@undisclosed.example.com) — 2026-04-04T08:27:12+00:00

Basic usage of the Event Machine for TCP servers require 'eventmachine' module MyServer def post_init end def receive_data(data) # For long-running operations, run in a separate thread #EM.defer do # EM.next_tick {} #end # To end the connection #close_connection_after_writing() end def unbind end end EM.run do EM.start_server hostname, port, MyServer end

gcp

Anonymous (anonymous@undisclosed.example.com) — 2026-03-01T19:27:34+00:00

GCP GKE # Prerequisites: # Create the GKE cluster with autopilot # Create the Artifact Registry / Repository for storing container images brew install google-cloud-sdk gcloud init # If it was previously initialized, perform the following instead #gcloud auth login #gcloud auth list #gcloud config set account #gcloud artifacts locations list # list of all loc, not just your repo gcloud auth configure-docker asia-south1-docker.pkg.dev docker tag omsdk:latest asia-south1-docker.pkg.dev/niti…

git

Anonymous (anonymous@undisclosed.example.com) — 2026-05-02T18:13:10+00:00

Git Remote Server Setting up a git server is as easy as this... # On the server cd /usr/local/share sudo mkdir mygitrepo sudo useradd -d /usr/local/share/mygitrepo -c "Git repo user" gituser sudo chown gituser mygitrepo cd mygitrepo sudo -u gituser mkdir myrepo1 sudo -u gituser git init --bare myrepo1 sudo passwd gituser # On the client mkdir project1 cd project1 touch dummyfile git init git add dummyfile git commit -m "Initial commit" git remote add origin ssh://gituser@myserver/usr/local/s…

grafana

Anonymous (anonymous@undisclosed.example.com) — 2025-12-07T14:15:22+00:00

For a demo docker run -d -p 3000:3000 \ --name grafana \ -v grafana-storage:/var/lib/grafana \ -v grafana-config:/etc/grafana \ grafana/grafana cat > dummy.json {"cpu": 5} Ctrl-D python3 -m http.server Default credentials are: admin/admin Install the

httpd

Anonymous (anonymous@undisclosed.example.com) — 2026-03-01T18:12:30+00:00

Apache web server Sample Config ServerRoot "/opt/homebrew/opt/httpd" Listen 127.0.0.1:8080 ServerName MyMacWebServer LoadModule mpm_prefork_module lib/httpd/modules/mod_mpm_prefork.so LoadModule log_config_module lib/httpd/modules/mod_log_config.so LoadModule unixd_module lib/httpd/modules/mod_unixd.so LoadModule authz_core_module lib/httpd/modules/mod_authz_core.so LoadModule mime_module lib/httpd/modules/mod_mime.so AddType text/html .html DocumentRoot "/Users/nitin/Documents/www/html/" …

installing_dokuwiki_on_32-bit_debian

Anonymous (anonymous@undisclosed.example.com) — 2025-11-11T18:07:36+00:00

Installing DokuWiki on 32-bit Debian It's 2025, most Linux distributions have dropped support for 32-bit hardware, yet my home web-server still lives on, running Debian 12. Here's how I installed DokuWiki. * Configured Apache2 for PHP by installing the libapache2-mod-php, php-xml, and php-bcmath packages

interesting202604

Anonymous (anonymous@undisclosed.example.com) — 2026-04-21T20:40:18+00:00

Interesting Stuff in April 2026 * Microsoft has an interesting Python tool, markitdown for converting documents to MarkDown. * Cheap routers? See Cudy, Tenda, Mercusys. Interesting Stuff in March 2026 * Looking for something to install on your NAS? Try JellyFin, Immich (Docker container only), and NextCloud.

java

Anonymous (anonymous@undisclosed.example.com) — 2026-03-01T19:20:44+00:00

Java Gradle Initializing a Gradle project $ mkdir TestGradle $ cd $_ $ gradle init --type java-application --dsl groovy Enter target Java version (min: 7, default: 21): Project name (default: TestGradle): Select application structure: 1: Single application project 2: Application and library project Enter selection (default: Single application project) [1..2] 1 Select test framework: 1: JUnit 4 2: TestNG 3: Spock 4: JUnit Jupiter Enter selection (default: JUnit Jupiter) [1..4]…

javascript

Anonymous (anonymous@undisclosed.example.com) — 2026-03-01T19:16:58+00:00

JavaScript Removing nulls in Mongoose //import { MongoClient } from 'mongodb'; import express from 'express'; import mongoose from 'mongoose'; const { Schema, model } = mongoose; const app = express(); // BEGIN - DB Init const mdbstr = 'mongodb+srv://myna:meisnitin@cluster0.fdu3e.mongodb.net/?retryWrites=true&w=majority&appName=Cluster0'; /* const client = new MongoClient(mdbstr); await client.connect(); */ await mongoose.connect(mdbstr); const carSchema = new Schema({ name: String, mod…

kaminari

Anonymous (anonymous@undisclosed.example.com) — 2026-03-14T08:03:26+00:00

Kaminari Add it to the Rails project with: bundle add kaminari rails g kaminari:config # Creates config/initializers/kaminari_config.rb # In the controller, replace MyModel.all with: MyModel.page params[:page] # In the view, add: <%= paginate @data %>

keepalive

Anonymous (anonymous@undisclosed.example.com) — 2026-03-16T19:20:58+00:00

keepalive Configure this service on 2 VMs. The backup will take over the floating IP if it does not receive the VRRP traffic. global_defs { router_id LVS_DEVEL vrrp_skip_check_adv_addr vrrp_garp_interval 0 vrrp_gna_interval 0 } vrrp_instance VI_1 { state MASTER # use "BACKUP" on the VM2 interface eth0 virtual_router_id 51 priority 100 # Use a lower number on the backup advert_int 1 authentication { auth_type PASS auth_pass 1111 } …

linux

Anonymous (anonymous@undisclosed.example.com) — 2026-05-02T16:11:40+00:00

Linux Popular Topics * bash * bind * chrony * Docker * diff * FirewallD * Git * keepalive * lxc * mail * rsync * Samba * SELinux * SystemD Unit Files * tuned * ufw * Vim * VNC Miscellaneous Suppressing the Service Restart prompt for "apt install" /etc/needrestart/needrestart.conf $nrconf{verbosity} = 0; $nrconf{restart} = 'a'; export DEBIAN_FRONTEND=noninteractive export APT_LISTCHANGES_FRONTEND=none export NEEDRESTART_MODE=a # default is "i"nteractive…

lxc

Anonymous (anonymous@undisclosed.example.com) — 2026-05-02T16:13:38+00:00

LXC Containers Snippet for Debian/Ubuntu sudo su - apt install -y lxc lxc-templates lxc-create -n mysrv1 -t download -- --dist ubuntu --release jammy --arch amd64 lxc-start -n mysrv1 lxc-attach -n mysrv1

mail

Anonymous (anonymous@undisclosed.example.com) — 2026-03-16T17:12:32+00:00

mail Quick Start To set up an email server, we typically use Postfix for SMTP, Dovecot for POP3/IMAP, and mail utilities (“s-nail” package on RedHat Linux). dnf install -y postfix dovecot s-nail Edit the /etc/postfix/main.cp file: inet_interfaces = all home_mailbox = Maildir/ # To match the path for dovecot

mongodb

Anonymous (anonymous@undisclosed.example.com) — 2025-12-13T16:57:52+00:00

Quick Setup For a quick setup with m and mtools on Debian/Ubuntu, download a script here. npm install -g m # Aaron Heckmann's verion manager # m 8.0.15 # m mongosh 2.5.9 # m tools 100.13.0 # PATH=$PATH::~/.local/m/tools/versions/100.13.0/bin:~/.local/m/shell/versions/2.5.9/bin:~/.local/m/versions/8.0.15/bin python3 -m pip install mtools psutil pymongo # Thomas Rucksteiss' mtools # mlaunch --init --replicaset --nodes 1 --sharded 2 --port 28000 # mongosh --port 28000

nginx

Anonymous (anonymous@undisclosed.example.com) — 2026-03-01T18:29:26+00:00

nginx Sample Config events { worker_connections 4096; } http { ssl_certificate /usr/share/server.cer; ssl_certificate_key /usr/share/server.key; server { listen 8080; location / { root /usr/share/nginx/html; allow 192.168.0.0/24; deny all; auth_basic "Root website"; auth_basic_user_file /usr/share/my_users; } location /app { rewrite /app(.*) /$1 break; proxy_pass http://MyAppServer:8080; } } }

oldtech

Anonymous (anonymous@undisclosed.example.com) — 2025-12-21T13:21:06+00:00

Old Computer Hardware and Electronics * YouTube video: How To Make Your Laptop Last FOREVER (My ThinkPad Mods & Upgrades), by Trip of a Lifestyle * YouTube video: I Rammed Modern Tech Inside a Vintage Laptop, by TME Retro (a.k.a. the Frankenstrad ALT not-286)

openssl

Anonymous (anonymous@undisclosed.example.com) — 2026-03-01T18:28:24+00:00

OpenSSL Generating a Self-Signed Certificate # One-liner openssl req -x509 -newkey rsa:4096 -keyout key.pem -out cert.pem -sha256 -days 3650 -nodes \ -subj "/C=IN/ST=Maharashtra/L=Mumbai/O=Pocket Theories/OU=IT/CN=myserver" # ...or, in separate steps # Create a key (genrsa - deprecated in favor of genkpkay in OpenSSL 3) openssl genrsa -aes128 -out my_server.key 4096 # -aes128 instead of -des3 is recommended # Create a key (genpkey) openssl genpkey -aes-128-cbc -algorithm RSA -pkeyopt rsa_…

powershell

Anonymous (anonymous@undisclosed.example.com) — 2026-04-18T09:56:00+00:00

Powershell # Create a folder New-Item -Path 'C:\Games' -ItemType Directory # Download a file with HTTP Invoke-WebRequest 'http://a.a/a.txt' -OutFile C:\a.txt # Can also use Invoke-RestMethod or # (New-Object System.Net.WebClient).DownloadFile('http://a.a/a.txt', 'C:\a.txt') # Async BITS transfer Import-Module BitsTransfer Start-BitsTransfer -Source 'http://a.a/a.txt' -Destination 'C:\a.txt' # -Asynchronous # Unset a variable Remove-Variable -Name MyVar1 # or Remove-Item -Path Variable:MyV…

python

Anonymous (anonymous@undisclosed.example.com) — 2026-05-01T16:48:12+00:00

Python SlackBotWithBolt JSON Serialization for Custom Classes Attempting to run json.dumps() on a custom class results in the error: “Object of type is not JSON serializable.” By returning the dict as the serializer in a lambda passed to the default parameter of json.dumps(), we can get the class to serialize to JSON.

railties

Anonymous (anonymous@undisclosed.example.com) — 2026-03-14T09:22:56+00:00

Railties To edit the scaffold templates, look up the location of the railties gem with “gem info railties” Within the location above, edit the templates in the subdirectories: * gems/railties-(version-here)/lib/rails/generators/erb/scaffold

ransack

Anonymous (anonymous@undisclosed.example.com) — 2026-03-14T08:35:56+00:00

Ransack bundle add ransack # In the model, whitelist the fields to search def self.ransackable_attributes(auth_object = nil) ["field1", "field2"] end # In the controller def index @q = MyModel.ransack(params[:q]) @data = @q.result(distinct: true).page(params[:page]) end # In the view <%= search_form_for @q do |f| %> <%= f.label :name_cont %> <%= f.search_field :name_cont %> <%= f.submit "Search" %> <% end %> <%# Do a render 'mymodel/search_form.html.erb' and put the a…

rsync

Anonymous (anonymous@undisclosed.example.com) — 2026-03-01T18:21:50+00:00

rsync rsync -arzP /dir1/ username@remotehost:/dir2 -a = preserve dates and other archive stuff -r = recursive -z = compress -P = partial and progress

ruby

Anonymous (anonymous@undisclosed.example.com) — 2026-04-19T18:59:14+00:00

Ruby Rails Popular Gems * EventMachine * Kaminari * Ransack * Railties Seed Data bundle add faker # Add it to only the development and test groups, if you are a stickler for convention # In db/seeds.rb 50.times do MyModel.create! name: Faker::Name.name end rails db:migrate && rails db:seed

samba

Anonymous (anonymous@undisclosed.example.com) — 2025-12-07T11:27:56+00:00

apt update apt install -y samba smbclient mkdir /usr/local/share/shared_dir chmod -R 0777 /usr/local/share/shared_dir # in /etc/samba/smb.conf [public] path = /usr/local/share/shared_dir public = yes guest only = yes writable = yes force create mode = 0666 force directory mode = 0777 browsable = yes systemctl restart smbd nmbd smbclient -L \\localhost

slackbotwithbolt

Anonymous (anonymous@undisclosed.example.com) — 2026-05-01T16:53:08+00:00

Slack Bot With Bolt Within the Slack website Go to api.slack.com , go to “Your Apps”, and “Create App”. Enable Socket Mode, and in token add “connections::write”. In the OAuth and Permissions tab, add the Bot Token Scopes. If you change these later, you will need to re-install the app to the workspace.

start

Anonymous (anonymous@undisclosed.example.com) — 2026-04-18T09:17:08+00:00

Pocket Theories This page serves as a top-level page for this wiki. * Interesting Stuff Computer Hardware and Electronics * Amazon Computer and Electronics Finds * Restoring and Modding Old Computer Hardware Software Administration * Ansible * Docker * DokuWiki * Grafana * httpd (Apache) * Linux * MongoDB * nginx * OpenSSL * Powershell * Windows Software Development * Artificial Intelligence / Machine Learning * git * Java *

vim

Anonymous (anonymous@undisclosed.example.com) — 2025-12-20T08:31:14+00:00

Vim This page is for vi / vim / NeoVim. YouTube videos: * 30 Vim commands you need to know (in 10 minutes) by typecraft

vnc

Anonymous (anonymous@undisclosed.example.com) — 2025-12-06T21:01:44+00:00

sudo apt update sudo apt install -y \ ubuntu-desktop gnome-panel gnome-settings-daemon metacity nautilus gnome-terminal \ xfonts-base xfonts-75dpi xfonts-100dpi \ xfce4 xfce4-goodies \ tightvncserver touch ~/.Xresources vi ~/.vnc/xstartup #!/bin/sh export XKL_XMODMAP_DISABLE=1 unset SESSION_MANAGER unset DBUS_SESSION_BUS_ADDRESS [ -x /etc/vnc/xstartup ] && exec /etc/vnc/xstartup [ -r $HOME/.Xresources ] && xrdb $HOME/.Xresources xsetroot -solid grey vncconfig -iconic & gnome-panel & gno…

windows

Anonymous (anonymous@undisclosed.example.com) — 2026-03-01T20:46:08+00:00

Windows winpty git-bash is unable to run some Windows applications (Eg. Python), and winpty provides a compatibility layer. Also see: https://stackoverflow.com/a/48200434/13066762 netsh # Allow file sharing in the firewall netsh advfirewall firewall set rule group=“File and Printer Sharing