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lcl A record – points to ip 113.xxx.xx.12x #public ip of my mail server, of course lcl MX record – mail handled by lcl.infotechviet.com #the above A record mail CNAME record – is an alias of lcl.infotechviet.com #not necessary, this is just for my web client/admin access: ie: https://mail.infotechviet.com

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Install Ansible on Ubuntu 18.04

Reference to: docs.ansible.com

sudo apt-get update
sudo apt-get install software-properties-common
sudo apt-add-repository --yes --update ppa:ansible/ansible
sudo apt-get install ansible

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" edit file:~ vi ~/.vimrc
" base
set nocompatible                      " vim, not vi
syntax on                             " syntax highlighting
filetype plugin indent on             " try to recognise filetype and load plugins and indent files

" interface
set background=dark                   " tell vim what the background color looks like
set colorcolumn=120                   " show a column at 100 chars
set cursorline                        " highlight current line

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Install and Secure Redis on Ubuntu

My reference:

• Digitalocean - Install and Secure Redis on Ubuntu 18.04
• Digitalocean - Install and Use Redis

1. Installing and Configuring Redis

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#!/bin/bash
# Author: Nghia Le <[email protected]>
# Description:
#   - To make user confirm the privilege which they are using to run a bash script
#     by asking user if they're sure and wanted to run this bash script as current log-in user.

read -n 1 -p "Do you want to run this bash script as $(whoami)? Yes/[No]: " YES_NO
echo -e "\n"

if [ -z ${YES_NO} ] || [ ${YES_NO} = "No" ] ||  [ ${YES_NO} = "no" ] ||  [ ${YES_NO} = "N" ] ||  [ ${YES_NO} = "n" ]; then

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#!/bin/bash
# Author: Nghia Le <[email protected]>
# Description:
#   - To ask user if they're sure and wanted to run this bash script as current log-in user

echo -e "\n"
read -n 1 -p "Do you want to run this bash script as $(whoami)? Yes/[No]: " YES_NO
echo -e "\n"
if [ -z ${YES_NO} ] || [ ${YES_NO} = "No" ] ||  [ ${YES_NO} = "no" ] ||  [ ${YES_NO} = "N" ] ||  [ ${YES_NO} = "n" ]; then
    echo -e "\nYou select No, then it is going to exit now... "

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---
# -----------------------------------------------------------------------------------------
# Purpose:  To manage system users:
#           - create/upadate a user who is allowed accessing via ssh connection
#           - add public ssh-key of user into its authorized_keys
#           - allow user to use sudo by putting a config into /etc/sudoers.d/
#           - remove authorized_keys of inactive users
#           - remove inactive users
#           - remove sudo permission by removing its config file in /etc/sudoers.d/ if any
# Maintanance: Nghia Le [at] INFOTECHVIET

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zalora-sre

1. README_1.txt

[sre_test@node045 ~]$ cat README_1.txt 
A php script is setup in this server and you can access to it by following command.

$ curl -v localhost

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Kỹ thuật lập trình nâng cao

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#!/usr/bin/env python
# Author: Nghia Le <[email protected]>
# Description:
#   - Yes/[No] Confirm to exit bash script
#

import os

def _wrap_with(code):
    def inner(text, bold=True):