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# Creating an empty dictionary
data = {}
# OR
data = dict()
# Creating a dictionary with initial values
data = {'a':1,'b':2,'c':3}
# OR
data = dict(a=1, b=2, c=3)

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yum install zlib-devel bzip2-devel openssl-devel ncurses-devel sqlite-devel 
readline-devel tk-devel gdbm-devel db4-devel libpcap-devel xz-devel

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DELETE TAG FROM REGISTRY
See: https://github.com/docker/distribution/blob/master/docs/spec/api.md#deleting-an-image

Working usage: https://github.com/byrnedo/docker-reg-tool

Stackoverflow: https://stackoverflow.com/questions/25436742/how-to-delete-images-from-a-private-docker-registry

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Create a new repository, or reuse an existing one.

Generate a new SSH key:

ssh-keygen -t rsa -C "your_email@example.com"

Copy the contents of the file ~/.ssh/id_rsa.pub to your SSH keys in your GitHub account settings.

Test SSH key:

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Here is a working example via aws-cli and jq.
Preparation
Create S3 bucket:
aws s3 mb s3://wei20181202s3

make_bucket: wei20181202s3
Create SNS topic:
aws sns create-topic --name wei20181202sns

{

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Mounting VirtualBox shared folders on Ubuntu Server 18.04 LTS (Bionic Beaver)

This guide will walk you through the steps on how to setup a VirtualBox shared folder inside your Ubuntu Server guest.

Prerequisites

This guide assumes that you are using the following setup:

• Oracle VM VirtualBox version 6.0.10 with Extension Pack installed
• Microsoft Windows 7 SP1 as the host OS
• A fresh install of Ubuntu Server 18.04.2 LTS as the guest OS

You could still make this guide work with other setups (possibly with some modifications to the commands and whatnot).

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Configuring git-credential-cache on Linux

git-credential-cache is a useful tool to remember your HTTP/HTTPS git credentials (though you really should be using SSH instead). It’s useful when using long passwords or access tokens. It stores them in memory for a specific amount of time.

Enabling it

$ git config --global credential.helper cache

Setting the timeout

$ git config --global credential.helper 'cache --timeout=600'

Disabling it

$ git config --global --unset credential.helper

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Step 1: Commit all your changes

Before proceeding, make sure all your changes are committed, including your .gitignore file.

Step 2: Remove everything from the repository

To clear your repo, use:

git rm -r --cached .

rm is the remove command -r will allow recursive removal

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proxy_cache_path /tmp/cacheapi levels=1:2 keys_zone=microcacheapi:100m max_size=1g inactive=1d use_temp_path=off;
server {
    listen 443 ssl http2 default_server;
    listen [::]:443 ssl http2 default_server;
    server_name example.com;

    location /api/ {
        # Rate Limiting
        limit_req zone=reqlimit burst=20; # Max burst of request

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MySQL Download URL

https://dev.mysql.com/get/Downloads/MySQL-5.5/mysql-5.5.56-linux-glibc2.5-x86_64.tar.gz

Open the terminal and follow along:

• Uninstall any existing version of MySQL

sudo rm /var/lib/mysql/ -R