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Overview

Spring Boot applications can run within a container by Multi-Layer based approach. Each layer may contain different parts of the application such as dependencies, source code, resources and even snapshot dependencies.

In the other hand, with Multi-Stage Build approach, any application can be built at a separate image from the final image that will contain the runnable application.

Spring Boot Docker

Multi-Layer

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Change default DNS nameserver used by Kubernetes pods

This can be applied generically but usually applies to Linux nodes that have a local caching nameserver running, which means pointing to an IP in the loopback range (127.0.0.0/8). Ubuntu 18.04 Bionic Beaver does this by default.

Option 1: Change host configuration

sudo systemctl mask systemd-resolved
rm -f /etc/resolv.conf
sudo ln -s /run/systemd/resolve/resolv.conf /etc/resolv.conf

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Reset mysql root password in Mac OS:

First Stop MySQL:

1. Go to: 'System Preferences' >> 'MySQL' and stop MySQL

OR,

1. sudo /usr/local/mysql/support-files/mysql.server start
2. sudo /usr/local/mysql/support-files/mysql.server stop

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require 'cgi'
require 'json'
require 'active_support'

def verify_and_decrypt_session_cookie(cookie, secret_key_base)
  cookie = CGI::unescape(cookie)
  salt         = 'encrypted cookie'
  signed_salt  = 'signed encrypted cookie'
  key_generator = ActiveSupport::KeyGenerator.new(secret_key_base, iterations: 1000)
  secret = key_generator.generate_key(salt)

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Indexes

• https://github.com/thoughtbot/guides/tree/master/style
• https://github.com/styleguide
• https://developer.mozilla.org/en-US/docs/Mozilla/Developer_guide/Coding_Style

HTML

• https://google.github.io/styleguide/htmlcssguide.xml
• http://www.w3schools.com/html/html5_syntax.asp
• https://contribute.jquery.org/style-guide/html/

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# decode_session_cookie.rb
# ------------------------
# The purpose of this script is to show that if I have the secret_key_base
# and a cookie to an active Rails session, I can decrypt it and gain access
# to key information about the user's session.

require 'rubygems'
require 'cgi'
require 'active_support'
require 'action_controller'

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ubuntu@ip-172-31-17-29:~/ansible_docker$ packer build  templates/production/docker_mysql.json
docker output will be in this color.

==> docker: Creating a temporary directory for sharing data...
==> docker: Starting docker container...
    docker: Run command: docker run -v /tmp/packer-docker353976599:/packer-files -d -i -t alo7/ubuntu:base_server /bin/bash
    docker: Container ID: 0679b2f24b7cce27257597f18ba8cc5e1616cda9006aa93373a36ab397de1079
==> docker: Provisioning with shell script: provision/scripts/install_common.sh
    docker: Install common software ...
    docker: Reading package lists...

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require 'bundler/capistrano'

set :application, "net"
set :repository,  "git@githost.com:net.git"

set :scm, :git

set :default_environment, {
  'PATH' => "$HOME/.rbenv/shims:$HOME/.rbenv/bin:$PATH"
}

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Sinatra

Installation:

Dependencies: ruby

gem install sinatra

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# Feel free to change this path of course (and keys_zone value as well, but also change the usage of it below).
proxy_cache_path /var/www/cache/resized levels=1:2 keys_zone=resizedimages:10m max_size=1G;

# Gzip was on in another conf file of mine...You may need to uncomment the next line.
#gzip on;
gzip_disable msie6;
gzip_static on;
gzip_comp_level 4;
gzip_proxied any;
# Again, be careful that you aren't overwriting some other setting from another config's http {} section.