https://blog.juliobiason.net/thoughts/things-i-learnt-the-hard-way/

Here is how one can setup a nginx to count the https connections made.

Preparation

Create a new folder

mkdir ~/docker_ssl_proxy
cd ~/docker_ssl_proxy

Put a dummy entry in your /etc/hosts file

127.0.0.1 YOURDOMAIN.com

Steps

First generate certificate

openssl req -subj '/CN=YOURDOMAIN.com' -x509 -newkey rsa:4096 -nodes -keyout key.pem -out cert.pem -days 365

create a new file something.conf with the following content

server {
  listen 4000 ssl;
  ssl_certificate /etc/nginx/conf.d/cert.pem;
  ssl_certificate_key /etc/nginx/conf.d/key.pem;

  # access_log /dev/stdout;
  access_log  /var/log/nginx/access.log;
  error_log /var/log/nginx/error.log;

  location / {
      return 200 'With style!';
      add_header Content-Type text/plain;
  }


}

Then run the docker with

docker run --rm -v `pwd`/logs:/var/log/nginx -v `pwd`:/etc/nginx/conf.d -p 4000:4000 nginx

Get the cacert

echo quit | openssl s_client -showcerts -servername server -connect YOURDOMAIN.com:4000 > cacert.pem
curl --cacert cacert.pem https://YOURDOMAIN.com:4000/ -d 'hello world'

And finally do some connections

go-wrk  -c=400 -t=8 -n=10000 -m="POST" -b='{"accountID":"1"}'  -i https://YOURDOMAIN.com:4000

You can do it from the Ruby on Rails application or even better way is to do it where you define your infrastructure and configure your proxy/loadbalancer etc. to allow it.

constrains manage
  class Whitelist
    def matches?(request)
      vpn = IPAddr.new("10.1.0.0/16")
      return true if Rails.env.development? || vpn.include?(request.remote_ip)

      Rails.logger.info("Blocking access for #{request.remote_ip} to #{rifiniti_vpn}")
      false
    end
  end

  constraints Whitelist.new do
    namespace :manage do
	...protected
    end
  end

Way of testing kitchen with vaults

suites:
  - name: default
    run_list:
      - recipe[....
    data_bags_path: ../../data_bags_test
    attributes:
      chef-vault:
        databag_fallback: true

copy your data_bags/ and decrypted vaults/ content in a new folder containing the merged content from both folders.

Do not forget to add data_bags_test folder in .git_ignore.

image from www.wannapik.com

If you want your developers and stuff to be happy please AVOID webex !

Webex is bad service

It has bad International connection. It doesn’t run on linux or unix and can’t be run in a browser. The IOS application is bad and doesn’t integrate with the links. The integration with the website and the calendars is bad. The website is slow and buggy and you can’t see the meeting on which you are invited. It is the worst of the software out there.

Zoom – It is like the webex. They look and feel the same one idea better, because it has client which can run in linux

Good one

https://www.bluejeans.com/ – works perfectly!

http://appear.in – free and great!

One can send a bunch of key => values to zabbix with the zabbix-trapper items.

Using this nice article  as a base I have packed everthing in a class so that you can use it:

Example usage:

values = {
  total_ram: 0,
  wrong_data_center: 0,
  linode_hosts: 0,
  missing_from_zabbix: 0,
  missing_from_graylog: 0,
}

zabbix_sender = ZabbixSender.new(Figaro['zabbix_server'])
zabbix_sender.message('super_druper_hostname', values)

require 'json'

class ZabbixSender

  def initialize zabbix_host
    @zabbix_host = zabbix_host
  end

  def message hostname, values
    values_with_host = with_host(hostname, values)

    params = {
      "request" => "sender data",
      "data" => values_with_host,
    }

    body = JSON.generate params
    data_length = body.bytesize
    data_header = "ZBXD\1".encode("ascii") + \
    [data_length].pack("i") + \
    "\x00\x00\x00\x00"
    data_to_send = data_header + body

    send data_to_send
  end

  private

  def with_host hostname, hash
    values = []

    hash.each_pair do |key, value|
      values << {
        key: key,
        value: value,
        host: hostname,
      }
    end
    values
  end

  def send data_to_send
    socket = TCPSocket.new(@zabbix_host, 10051)
    socket.write data_to_send.to_s
    response_header = socket.recv(5)
    if not response_header == "ZBXD\1"
      puts "response: #{response_header}"
      raise 'Got invalid response'
    end

    response_data_header = socket.recv(8)
    response_length = response_data_header[0,4].unpack("i")[0]
    response_raw = socket.recv(response_length)
    socket.close
    response = JSON.load(response_raw)
  end

end

learn programming

challenges

• https://www.hackerrank.com/contests
• https://codefights.com/challenge/mMdsrajm7T9H87Noc/main
• https://www.codingame.com/
• http://exercism.io/languages
• http://rubyquiz.com/

mentoring

• https://www.codementor.io/tips/6543378221/a-slightly-slimmed-down-version-of-the-official-select2-ajax-example-on-how-to-have-an-ajax-powered-autocomplete-dropdown

Optimizations

• javascript
  • https://github.com/Kikobeats/js-mythbusters
• ruby
  • https://www.rubytapas.com/

Algorithms

• https://www.quora.com/What-are-the-most-learner-friendly-resources-for-learning-about-algorithms
• https://www.analyticsvidhya.com/learning-paths-data-science-business-analytics-business-intelligence-big-data/
• http://bigocheatsheet.com/
• bulgaria
  • http://cs.maycamp.com/?page_id=83
• линейна алгребра
  • http://immersivemath.com/ila/index.html
• курсове
  • http://videolectures.net/mit6046jf05_introduction_algorithms/

Функционално програмиране

• https://github.com/hristozov/fpkn1617

Academies

• https://www.codecademy.com/
• http://exercism.io/
• http://www.codingdojo.com/
• https://egghead.io/
• https://www.edx.org/course/introduction-functional-programming-delftx-fp101x-0

Online help

• https://www.codementor.io/experts

Conferences

• ruby
  • http://rubyc.eu/

quizes

• https://projecteuler.net/

The world is going crazy. The mysql manual for 5.7.3 is not working.

Here is how to remove the password…

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