packer: virtualbox

Prep

• Vagrant
• vagrant init hashicorp/precise64
• vagrant up
• vagrant destroy -f

Generate

• Packer
• find ~/.vagrant.d/ -name '*ovf' -ls | grep hashi
• create ex001.json
• see below
• fix "source_path" to ovf file to match your system
• packer validate ex001.json
• packer build ex001.json
• vagrant box add my-box-001 packer_virtualbox-ovf_virtualbox.box --force

Test

• mkdir test001
• cd test001
• vagrant init
• in generated "Vagrantfile", change 1st line to 2nd line
•   config.vm.box = "base"
•   config.vm.box = "my-box-001"
• vagrant up
• vagrant ssh
• cat /var/tmp/welcome.txt
• should say, "welcome001"
• vagrant destroy -f

Cleanup

• vagrant box remove my-box-001 --force
• vagrant box remove hashicorp/precise64 --force

---

ex001.json

{
  "builders": [{
      "type": "virtualbox-ovf",
      "source_path": "<path to your home dir>/.vagrant.d//boxes/hashicorp-VAGRANTSLASH-precise64/1.1.0/virtualbox/box.ovf",
      "ssh_username": "vagrant",
      "ssh_password": "vagrant",
      "shutdown_command": "echo 'packer' | sudo -S shutdown -P now"
    }],
    "provisioners": [
        {
            "type": "shell",
            "inline":[ "echo welcome001 > /var/tmp/welcome.txt" ]
        }
    ],
    "post-processors": ["vagrant"]
}

Docker: simple example, fast

See github link for instructions on how to run.

docker-compose.yml

version: '2'
services:
    app:
        build:
            context: ./
            dockerfile: app.docker
        ports:
            - "80:80"

app.docker

FROM silintl/ubuntu:16.04

RUN echo 'debconf debconf/frontend select Noninteractive' | debconf-set-selections
RUN apt-get update
RUN apt-get install -y apache2

WORKDIR /var/www/humankind

RUN echo " \n\
 \n\
    ServerName humankind \n\
    DocumentRoot /var/www/humankind \n\
 \n\
" >> /etc/apache2/sites-available/humankind.conf

RUN a2dissite 000-default.conf && a2ensite humankind.conf

RUN echo "Automation for the People" > /var/www/humankind/index.html

EXPOSE 80
CMD ["apache2ctl", "-D", "FOREGROUND"]

See: https://github.com/pcleddy/mini001

simple angularjs 1.x webapp

Here's a very simple app using AngularJS 1.x.

Hints:

• Ignore how the first couple of lines in app.js work, and just use as is.
• Anything in index.html that starts with "ng-" is a "angular directive", fancy term for a placeholder. Angular repeatly scans the DOM for these, gulps them up and runs them. Sometimes it is just a div, sometimes the whole body. You decide how much of the DOM a directive needs to control. Try to keep it as small as possible.

Code: https://github.com/pcleddy/wordcounter
Live app: http://bit.ly/2iiEuoY (I hope)

Maybe try to play with app.js to see if you can add some functionality using m_words.

create simple mysql table for testing

CREATE TABLE suppliers (
    SupplierID SMALLINT UNSIGNED ZEROFILL NOT NULL AUTO_INCREMENT,
    SupplierName VARCHAR(40) NOT NULL,
    Phone VARCHAR(14) NOT NULL,
    Email VARCHAR(60) NULL,
    PRIMARY KEY (SupplierID)
 );

INSERT INTO suppliers (SupplierName, Phone, Email) VALUES ('ABCSupplier','1122334455','abc@dicforum.com');

Ubuntu: convert desktop to server fast

Below as root:

1. apt-get remove ubuntu-desktop
2. apt-get install linux-server linux-image-server
3. apt-get purge lightdm
4. /etc/default/grub, change matching lines to below
1. #GRUB_HIDDEN_TIMEOUT [comment it out]
2. GRUB_CMDLINE_LINUX_DEFAULT=""
3. GRUB_TERMINAL=console
5. update-grub
6. reboot

Taken: http://www.darrinhodges.com/converting-ubuntu-12-04-lts-desktop-to-server/

Simple Ruby email out localhost:25, no OpenSSL::SSL::SSLError, no tlsconnect error

Notes:

1. This skips the common OpenSSL::SSL::SSLError / tlscommon errors somehow, see below for error output.
2. DON'T use pony's "smtp" hash option, it has the same problem. Notice it is missing here!

Steps:

1. gem install pony
2. take below code 
1. put in ~/bin/mail_test.rb
2. tweak for your environment
3. chmod +x ~/bin/mail_test.rb 

https://github.com/pcharlesleddy/misc/blob/master/mail_test.rb

#!/usr/bin/ruby

require 'rubygems'
require 'pony'

mystring = "a\nb\nc"

Pony.mail(:to => 'abc@efg.org', :from => 'me@example.com', :subject => 'Test mail script', :body => 'Hello there.', :attachments => {"mail_test.txt" => File.read("/home/me/bin/mail_test.rb"), "mystring.txt" => mystring})

Common, irritating tlscommon error:

/usr/lib/ruby/1.8/openssl/ssl-internal.rb:123:in `post_connection_check': hostname was not match with the server certificate (OpenSSL::SSL::SSLError)

from /usr/lib/rvm/gems/ruby-1.9.3-p194/gems/mail-2.5.3/lib/mail/core_extensions/smtp.rb:17:in `tlsconnect'

from /usr/lib/ruby/1.8/net/smtp.rb:562:in `do_start'

#!/usr/bin/ruby

from /usr/lib/ruby/1.8/net/smtp.rb:525:in `start'

from /usr/lib/rvm/gems/ruby-1.9.3-p194/gems/mail-2.5.3/lib/mail/network/delivery_methods/smtp.rb:136:in `deliver!'

from /usr/lib/rvm/gems/ruby-1.9.3-p194/gems/mail-2.5.3/lib/mail/message.rb:245:in `deliver!'

from /usr/lib/rvm/gems/ruby-1.9.3-p194/gems/pony-1.4/lib/pony.rb:166:in `deliver'

from /usr/lib/rvm/gems/ruby-1.9.3-p194/gems/pony-1.4/lib/pony.rb:138:in `mail'