Pocket Theories

interesting202604 - created

reddy (reddy@undisclosed.example.com) — 2026-04-11T09:11:14+00:00

Interesting Stuff in April 2026 * Microsoft has an interesting Python tool, markitdown for converting documents to MarkDown.

start

reddy (reddy@undisclosed.example.com) — 2026-04-11T09:09:34+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 * DokuWiki * Grafana * httpd (Apache) * Linux * MongoDB * nginx * OpenSSL * Powershell * Windows Software Development * Artificial Intelligence / Machine Learning * git * Java * JavaScript *

eventmachine - created

reddy (reddy@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

ruby

reddy (reddy@undisclosed.example.com) — 2026-04-04T08:23:50+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

keepalive

reddy (reddy@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

reddy (reddy@undisclosed.example.com) — 2026-03-16T19:11:32+00:00

Linux Popular Topics * bash * bind * Docker * diff * Git * keepalive * mail * rsync * Samba * SystemD Unit Files * tuned * 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; change to "a"utomatic ; see: /etc/needrestart/needr…

mail

reddy (reddy@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

bind

reddy (reddy@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"; };

railties - Modifying templates

reddy (reddy@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 - Quick Start

reddy (reddy@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…