Online free website tools to separate song audio music background and vocals or voice

Hi all,

There might be several instances in which you might think you want to have only a song background or vocals (voice) to try your remix skills.

Here are the online tools

1. Ai Vocal Remover Free Online | Media.io
2. Vocal Remover and Isolation [AI]

Procedure

1. In both applications, you need to upload the song.
2. Once it's uploaded after processing, you will get 2 music files.
3. You can play, and once you are happy with the result, you can download it to the local system.

Feel free to drop your comments and feedback to psrdotcom@gmail.com

Configure a API Backend Server with custom domain on Amazon Web Services (AWS) EC2 Ubuntu with NGINX and Certbot SSL

Hi all,

Build your own API backend server on AWS free-tier with SSL.

The below steps with reference links will provide detailed information of each step.

1. AWS account - Free-tier
2. Create EC2 Ubuntu
3. Connect to Ubuntu from your local using SSH/Putty
4. Install NodeJS
1. Open terminal
2. curl -fsSL http://deb.nodesource.com/setup_lts.x | sudo -E bash -
3. sudo apt update
4. sudo apt install nodejs //installs latest LTS nodejs
5. Create a sample node server
6. Install and configure node server process manager
1. sudo npm install -g pm2@latest
2. Navigate to nodejs server folder
3. pm2 start <filename>
4. pm2 startup systemd
5. pm2 save
6. pm2 list // List all the nodejs apps with status
7. pm2 stop/restart/start app_name/id // Actions of nodejs servers
7. Install Nginx
8. Configure your domain DNS records to map to AWS EC2 public/elastic IP address
9. Secure Nginx with SSL certs

Hope the above information is useful to set up the environment and play with your backend server.

Feel free to send your feedback and comments to psrdotcom@gmail.com

Generate Free SSL HTTPS Certificates with 90 days validity using letsencrypt

 Hi all,

As discussed in my earlier blog, Generate Free SSL Certificate using ZeroSSL where the limitation of one free certificate on ZeroSSL can be eliminated using Get HTTPS for free!

This process includes the following prerequisites and procedures.

Note: This process is not for beginners or production usage scenarios. Use this process if you are knowledgeable about certificate generation.

Prerequisites

• OpenSSL command line
• [Li]nix / Mac OS

Procedure

• Open the URL https://gethttpsforfree.com
• It has 5 steps
• Account Info
• Certificate Signing Request
• Sign API Requests
• Verify Ownership
• Install Certificate
• In each step, some commands or processes need to be followed to get the free SSL certificate.

1. Account Info
1. In this step, we will be providing the email and public key.
2. Keep the generated private key security in your system.

• Note: If you are unsure about the public key generation commands, click on the "how do I generate this?" link, which is available over the public key input textbox.

2. Certificate Signing Request (CSR)
1. Generate the CSR for the required domains

• Note: You can generate the CSR for wildcard certificates and www subdomain with the same command

2. Try to follow the same format, including the line feeds mentioned below.

#change "/etc/ssl/openssl.cnf" as needed:
    #  Debian: /etc/ssl/openssl.cnf
    #  RHEL and CentOS: /etc/pki/tls/openssl.cnf
    #  Mac OSX: /System/Library/OpenSSL/openssl.cnf

    openssl req -new -sha256 -key domain.key -subj "/" \
      -reqexts SAN -config <(cat /etc/ssl/openssl.cnf \
      <(printf "\n[SAN]\nsubjectAltName=DNS:foo.com,DNS:www.foo.com")) 

3.  Sign API Requests
1. Sign all the requests with the private key

• Note: You need to copy the command and execute it on your PC/Mac terminal, and the result needs to be pasted on the web page.

4. Verify Ownership
1. In this step, you need to prove your domain ownership
2. You will be given 3 options
1. Python server
2. file-based
3. DNS record (I've used this option)
1. Update the DNS records with new TXT entries, and use the online dig tool to make sure the records are visible.
2. After we verify the availability of the records, you need to click on the respective buttons on the web page.
3. Repeat the same steps for each domain on CSR (www and any sub-domains).
5. Install Certificate
1. You will be able to receive your certificate in "chained.pem" format
2. Copy and paste the first certificate section (e.g. the first "-----BEGIN CERTIFICATE-----" section) into a text file named "domain.crt".
3. Copy and paste the second certificate section (e.g. the second "-----BEGIN CERTIFICATE-----" section) into a text file named "intermediate.pem".

• Note: Expand the "how do I install this?" link for quick help.

Hope this will help you to generate free SSL for your websites.

Request you to send your valuable feedback and comments to psrdotcom@gmail.com

Extend Ubuntu VM hard disk space/size

 Hi all,

Today I will explain about the process to extend and existing disk space in Ubuntu VM.

Environment

1. VMWare
2. Ubuntu

Context

Increase hard disk space more than initially configured for the Ubuntu VM.

Reason

VM hard disk might running out of space.

Procedure

• Make sure we have shutdown the Ubuntu VM
• Increase the hard disk size
• Make sure it's in the allowed range
• 
• Start the VM
• Open the Disks application in Ubuntu
• 
• In below example we are extending it by additional 3GB
• Select the Extended Partition block
• Click Settings (Gear) icon
• Choose Resize option
• 
• Use the increment (+) icon or scroll bar to increase the partition size
• Click on Resize button
• Enter credentials when prompted
• By now, the extended partition will be increased
• Time to select the file system, where exactly our data is getting stored
• We will repeat the process of resizing like earlier
• Using scrollbar increase the disk size
• 
• Click on the Resize button
• 
• The harddisk size is been reflected.

Hurray !! You have increased your hard disk size to store more data on the Ubuntu VM.

The same process can be used for normal Ubuntu OS also.

Please send your comments and feedback to psrdotcom@gmail.com

Generate Free SSL Certificate using ZeroSSL

 Hi all,

Today I am going to explain the process of generating free SSL certificate using ZeroSSL

Pre-requisite

1. We should have our own domain
2. We should be able to add/update the DNS settings like A, CNAME, TXT records

Best free SSL providers

As per my research I found the best free SSL (90 days) certificate providers

1. ZeroSSL
2. Let's Encrypt

In this blog, i'll explain ZeroSSL process

ZeroSSL Free SSL Certificate

1. Navigate to https://zerossl.com/
2. Signup with your email by clicking on "FreeSSL"
3. After email verification, login to zerossl site
4. Click on "New Certificate"
5. 
6. Enter your domain name and click on "Next Step"
7. Default validity is 90 days for free SSL
8. 
9. In the CSR section we have couple of options
10. Default is Auto-Generate CSR enabled
11. Disable Auto-Generate CSR - only your zerossl registered email address with default values
12. Enable Paste Existing CSR - If you have already created a CSR then you can use this option
13. 
14. Finalize your order
15. 

Note

ZeroSSL will generate the certificate using signature algorithm SHA-384

In some cases, if SHA-384 based SSL is not valid then we have to mandatory go for alternate "Let's Encrypt". I will explain Let's Encrypt in my next blog.

For every 90 days, we need to renew our certificate in the above mentioned manner.

Download Certificate

1. Navigate to Certificates section
2. Go to Issued tab
3. 
4. Click on "Install"
5. 
6. You can select the Default Format dropdown to select specified server or just leave it default.
7. Download the certificate zip file which will contain 
1. ca_bunder.crt - CA Bundle
2. certificate.crt - Certificate
3. private.key - Private Key

Hope, you will be able to make use of this free SSL feature and encrypt your domain traffic.

Please let me know your feedback and suggestions in comments or mail to psrdotcom@gmail.com

Simple free and open source generating QR code in your web page or blog with an API call

Hi folks,

Do you want to generate QR codes and display in your website or blog or for development.

You can call these API with the relevant data to get the QR code as an image format

1. https://chart.googleapis.com/chart?cht=qr&chl=Hello+PSR&choe=UTF-8&chs=200x200

    cht -> Chart Type = QR

    chl -> Chart Data = data

    choe -> Chart Encoding = UTF-8

    chs -> Chart Size = width x height

2. https://api.qrserver.com/v1/create-qr-code/?size=200x200&data=SureshRajuPilli

    size = width x heigth

    data = text data which we want to place in QR code

3. https://www.qr-code-generator.com/qr-code-api/ with POST method

    

    Request Body    

{

    "frame_name": "bottom-frame",

    "qr_code_text": "https://www.qr-code-generator.com/",

    "image_format": "SVG",

    "frame_color": "#02bfff",

    "frame_text_color": "#ffffff",

    "frame_icon_name": "mobile",

    "frame_text": "Scan me",

    "marker_left_template": "version13",

    "marker_right_template": "version13",

    "marker_bottom_template": "version13"

    }

Please send your queries and feedback to psrdotcom@gmail.com

Free and discounted tools or software for Student Developers

Hi All,

Today I will share information of the tools which are free or less price for the student developers.

1. https://education.github.com/pack - Every student must subscribe to this
2. https://github.com/AchoArnold/discount-for-student-dev
3. https://github.com/ripienaar/free-for-dev
4. https://techcrunch.com/2019/08/20/github-adds-21-new-partners-to-its-free-student-developer-pack/
5. https://dzone.com/articles/20-pro-developer-tools-with-great-student-discount

Hope my links are useful for all the students.

And for the teachers also, the GitHub provides pack.

Please send your valuable feedback and comments to psrdotcom@gmail.com

Capture localhost (127.0.0.1) system packets using RawCap

Hi friends,

Today I am going to share the knowledge of capturing network packets in local system i.e. localhost.

Using RawCap utility, you can capture the loopback adapter packets which are our localhost packets.

Procedure

Download the RawCap.exe from Netresec website url
http://www.netresec.com/?page=RawCap
Once you download it
Open command prompt with administrator privileges
You have the following options while running the RawCap.exe

Syntax

RawCap.exe
-c <-> Stop capturing after the specified packet count reached
-f <-> Flush each packet without buffering
-s <-> Stop capturing after the specified time limit

Example 1:
RawCap.exe 127.0.0.1 dump.pcap
Note: Ctrl + C to stop the capturing

Example 2:
RawCap.exe -c 1000 127.0.0.1 dump.pcap
After 1000 packets, the capturing will stop

Please send your feedback and comments to psrdotcom@gmail.com

Chennai Autorickshaw Old Vs. New Fare Android Application Lite Version

Hi all,

I have released the free version of chennai autorickshaw android app in google play.

Please look at this app and send your feedback.

https://play.google.com/store/apps/details?id=info.pillisureshraju.chennaiautokaasulite






 Download it for free.

Scan QR

and install on your phone directly.

UML Software(s) and Tutorial/Books Free/Open Source Download

In my viewpoint these are best sources to learn Unified Modeling Language (UML)

Open source Software:

• http://www.umlet.com/
• http://staruml.sourceforge.net/en/
• http://argouml.tigris.org/
• http://www.yworks.com/en/products_yed_about.html
• http://www.visual-paradigm.com/download/vpuml.jsp?edition=ce

Tutorials and Books:

• UML Nutshell
• Learning UML 2.0
• Introduction to UML
• UML by Grady Booch

 

Please send your feedback and comments to psrdotcom@gmail.com

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Linux tools useful for day to day life

Hi everyone,

I just read some of the linux tools description from linux journals. Just want to share those things.

1. FFmpeg: Video converter to covert videos for YouTube. Our own videos will be converted in to YouTube suitable format.
2. Mutt: Its a command line e-mail reading tool.
3. Zsh: Create own shell with different colors and in output also we can put some colors to identify the output easily.
4. SOX: Audio editor, We can add echo easily by using this editor and we can convert audio to various formats.
5. Trickle: By using this tool, we can control the network traffic. In torrent downloaders and in browsers we can set the speed while downloading.
6. Privoxy: Control the web access like blocking unwanted sites and blocking unwanted content.

References:
Linux Magazine
http://www.ffmpeg.org/
http://www.mutt.org/
http://en.wikipedia.org/wiki/Z_shell
http://www.zsh.org/
http://sox.sourceforge.net/
http://www.tuxradar.com/content/control-your-bandwidth-trickle
www.privoxy.org/

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