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

Download Chrome Extension for offline Installation

 Hi folks,

I tried to use my extension for offline usage for a VM based PC browser which doesn't have internet to download the extension.

So, I have come up with this approach where you can download the chrome extension (.crx) file.

Find the extension ID

Sample browser extension URL in chrome web store is below

https://chrome.google.com/webstore/detail/previous-next-page/fmichikmgflpgibapdhepmodjdjemmda

Last word is the extension ID (fmichikmgflpgibapdhepmodjdjemmda)

Download the extension file

Browser: Use Mozilla Firefox or other browser but not chrome

Syntax

https://clients2.google.com/service/update2/crx?response=redirect&prodversion=<<browser_version>>&acceptformat=crx2,crx3&x=id%3D<<extensionID>>%26uc

Example

https://clients2.google.com/service/update2/crx?response=redirect&prodversion=85.0.4183.121&acceptformat=crx2,crx3&x=id%3Dfmichikmgflpgibapdhepmodjdjemmda%26uc

Install the extension

1. Copy the .crx file to your offline computer
2. Open Chrome browser
3. Navigate to chrome://extensions
4. Enable developer mode
5. Drag and drop the .crx file

Hope you will be able to use the offline extensions in chrome.

Request you send your comments and feedback in blog or mail : psrdotcom@gmail.com

Go language install and configuration in Windows and Visual Studio Code as IDE

Hi folks,

Today I am going to describe you the best way to install and configure the Go language.

Download

From the Go language from its official web page https://golang.org/dl/

After installation, you would be able to program and run the code from any terminal.

What else?

Open your .go file in Visual Studio Code, it asks you something else. What was it?

"The "go-outline" command is not available. Run "go get -v github.com/ramya-rao-a/go-outline" to install."

What you need to do?

First, in Visual Studio Code set the the following in "settings.json" file.

"go.toolsGopath": "C:\\Go"

Note: If you are getting the following error, then click on "Install All"
The "go-outline" command is not available. Run "go get -v github.com/ramya-rao-a/go-outline" to install.

• Get the location, where it is installing
• Copy the bin and pkg folder contents to your Go installed folders.
• Delete the folder which VS Code used to download the content.

That's all.. you should be able to code in Visual Studio Code as well without having 2 different go installed folders.

Happy Go coding!!

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

Connect to remote Oracle database server from RedHat Linux 7 using Oracle InstaClient

Hi friends,

I have come across a situation, where I need to connect to remote Oracle database server from RedHat Enterprise Linux (RHEL) 7. I found a way of using the Oracle InstaClient instead of installing the full Oracle DB which internally consists of Client.

Pre-requesites

1. Linux mahcine (I tried with RHEL 7) with following softwares
• Java (JAVA_HOME should be available)
• Development Tools (RHEL 7 tools like gcc etc.)
2. Another machine where Oracle server is installed with the following config
• Database schema should be available
• Users should be available instead of system/sysdba users
3. Both machines shall be reachable to each other via ping.

Note: You should know the database server SID/service name.

Procedure

Download

1. Download the insta client from Oracle Official Page
2. In my case, I have downloaded the "Instant Client for Linux x86-64"
3. Accept the license agreement
4. Click "oracle-instantclient18.3-basic-18.3.0.0.0-1.x86_64.rpm" to download
5. Optionally, you can download the "oracle-instantclient18.3-sqlplus-18.3.0.0.0-1.x86_64.rpm" to have sqlplus command line utility for testing
6. Alternatively, you can download the zip files and download the same to install.
7. In my case, I am going with RPMs.

Install

• Install the downloaded RPMs
• #> yum install oracle-instantclient18.3-basic-18.3.0.0.0-1.x86_64.rpm
• #> yum install oracle-instantclient18.3-sqlplus-18.3.0.0.0-1.x86_64.rpm
• While installing, it asks for locations, accept the defaults by pressing the "Enter" button

Note: If any dependencies are there, please install those.

Environment Variables

• Create a oracle_env.sh file and setup your variables
• #> gedit /etc/profile.d/oracle_env.sh

export ORACLE_HOME=/usr/lib/oracle//client/
export TNS_ADMIN=/usr/lib/oracle//client/
export PATH=$ORACLE_HOME/bin:$PATH
export LD_LIBRARY_PATH=$ORACLE_HOME/lib:$LD_LIBRARY_PATH

• Save your file
• Source your file with following command
• #> source /etc/profile.d/oracle_env.sh

tnsnames.ora

• Create tnsnames.ora file in your $ORACLE_HOME with following syntax

localsid = (DESCRIPTION =
    (ADDRESS = (PROTOCOL = TCP)(HOST = )(PORT = ))
    (CONNECT_DATA =
      (SID = )
    )
  )

• Instead of SID, you can use SERVICE_NAME also.

Connect

• You can test the connection
• #> sqlplus @

You should be able to connect to your remote database.

Hope, it is useful for you.

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

Android L Preview on Nexus 7

Hi all,

Today I’ve finally loaded the Android L Developer Preview on my Nexus 7 Wi-Fi 32GB

 

Its so simple to load the Android L. Here is the procedure

 

Warning

All the device data will be erased. Please take backup of all your data before doing this upgrade.

Not all the applications will work since it’s just a developer preview OS version

 

Pre-requisites

• Android SDK with latest update
• Android L Preview OS image
• Make sure that, your device has more than 60 to 70 percent of battery
• Enable USB Debugging
• Connect the device to computer with USB cable. Make sure that, it has detected by computer

 

If you don’t’ have the pre-requisites, please follow the below procedure

 

Android SDK Installation & Update

1. Download the Android SDK from this link
2. https://developer.android.com/sdk/index.html
3. Open SDK Manager.exe
4. Install Tools, Android L Preview, Extras
5. Update latest version if available

 

Android L Preview OS Image Download

1. Download the corresponding Android L OS image for your device from this below link
• https://developers.google.com/android/nexus/images

 

Installation Process

1. Extract the downloaded image to a folder
2. From Android SDK folder, navigate to “platform-tools” folder, copy adb.exe, AdbWinApi.dll, AdbWinUsbApi.dll and fastboot.exe
3. Paste in the Android L Preview extracted folder
4. Finally the extracted folder should look like this
• 
5. The highlighted files has been copied from SDK->platform-tools folder
6. Open the command prompt and navigate to OS extracted folder
• Tip
• Open the folder in explorer window. Hold “Shift” and right click on mouse
• Select “Open command Window here” option
7. Connect the device to computer
9. Put device into “fastboot” mode by rebooting
• cmd> adb reboot fastboot
10. Device gets rebooted to fastboot
11. If device is locked, then please unlock it
• cmd> fastboot oem unlock
12. Now, run the “flush-all” script
• cmd> flush-all
13. It takes some time to install the image
14. After completing the installation process, it asks you to press “enter/return” button to exit
15. Press enter/return button for confirmation
16. Device gets restarted, Android L Preview will be displayed on the device
17. To lock the device, execute following commands
• cmd> adb reboot fastboot
• cmd> fastboot oem lock
18. Like a new device, enter all the details like your Gmail account, Wi-Fi connection etc.
19. Enjoy the features of Android L Developer Preview OS

 

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

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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

Blogger Labels: Software,Tutorial,Free,Open,Source,Download,viewpoint,Language,visual,paradigm,edition,Nutshell,Introduction,Grady,Booch,feedback,comments,Tutorials

UPSC Civil Services Premilinary Examination 2012 e-admit card / Hall Ticket Download

Hi all Civil Services Aspirants,

You can download the UPSC Civil Services Preliminary Examination 2012 e-Admit card (Hall-Ticket) through this link.

http://www.upsc.gov.in/

Please follow the below instructions to download the e-Admit card.

1. On the right side of the page, you will find the "What's new" section.
2. Under "What's new" section, click on the e-Admit Card-Civil Services (Preliminary) Exam.,2012 
3. Please read the instructions carefully.
4. Click on the "Click Here" link from the page

Important Instructions are:

• Exam will be conducted in 2 sessions
• Morning session: 9:30AM to 11:30AM
• Afternoon session: 2:30PM to 4:30PM
• Please reach the examination hall before 20 minutes of the session start time
• Candidates are not allowed after 10 minutes to session start time
• Bring only the Black Ball Point Pen to the examination center
• Produce the downloaded e-Admit card at the examination center
• If the downloaded e-Admit card photograph is not clear then
  
• Bring 2 Passport size photographs (For 2 sessions, Morning and Afternoon)
• Photo Identity Proof such as Driving License, Passport, Ration Card or any Govt. approved card
• Any electronic device is not allowed inside examination center
• Last date to download the e-Admit Card is 16-May-2012
• Note: They will send you the e-Admit card to your registered e-mail id with UPSC.

Download Link of the e-Admit Card

http://164.100.128.31/CSPDefault.aspx

Download Process:
 
By 3 ways, you can download the e-Admit card

• Click on the above mentioned link
• Choose any one option
• Registration Number: At the time of registration you will get this. (or)
• Roll Number: After registration completion, you will get a roll number. (or)
• Name: You full name as per the certificate, Father name and mother name (without Initials)
• Provide your Date of Birth
• Enter the captcha(characters in the box)
• Click on the "Submit" button

Your e-Admit card gets downloaded.

All the very best for your examination.

Eclipse C C++ CDT Plugin Download and Installation with Link or Location Problem Solution

Hi all,

If you are using Eclipse with Java or any other platform and you are planning to install the C/C++(CDT) Plugin then please follow the steps.

Installation Steps:

• In Eclipse, Click the Help->"Install New Software"
• You will get a Install named window
• Click "Add" button
• Enter the name as "CDT Plugin" [Without Double quotes " "]
• Location as "http://download.eclipse.org/tools/cdt/releases/(Your Eclipse Version)" [Without Double quotes " "] 
• Example: http://download.eclipse.org/tools/cdt/releases/indigo 
• You can find your suitable Eclipse link from this http://www.eclipse.org/cdt/downloads.php 
• Common Error: While copying from the CDT Download page, we usually copies the entire path from the webpage including the dot(.) which they provided. 
• http://download.eclipse.org/tools/cdt/releases/indigo. -- Incorrect Location 
• http://download.eclipse.org/tools/cdt/releases/indigo -- Correct Location
• Please remove the dot(.) at the end while adding the CDT Plugin location from the link.
• In "Install" Window, "Work with" textbox, please type the CDT and you will prompted with different options, Select the desired option and click/hit "Enter/Return" button.
• It will show the similar kind of screen as shown below

• You can select the all/desired tools to download
• Please "Restart Eclipse" to complete the CDT Plugin installation for Eclipse
• Now you can develop your C/C++ applications with Eclipse

Happy Coding ..


For further queries, please mail to psrdotcom@gmail.com

Adobe Digital Editions free eBook, Digital Publications reader

Hi all,

We can download free eBook reader called from Adobe Digital Editions. It is awesome to use and read the eBook from it. You can purchase the digital eBooks and read from it.

Installation Steps:
1) Please visit this http://www.adobe.com/products/digitaleditions/
2) In the "Install Digital Editions" Section, One separate frame named "Adobe Digital Editions Installer" with any one of the following

  a) System (Error):
      "Sorry, but your system does not meet the minimum system requirements"
  b) Install: Click on install to to start the installation
       -> Download the executable and Install the software
       -> Give your Adobe ID if exists at the time of installation
  c) Launch: If the software already installed, it will launch the application
3) For testing, you can download the sample eBooks from adobe digital editions sample library
4) Click the downloaded item to view in Adobe Digital Editions

Enjoy the eBook reading. The digital editions available in different languages.

References:
http://www.adobe.com/products/digitaleditions/
http://www.adobe.com/products/digitaleditions/library/