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Author: Sreekumar Kj

Sreekumar (KJ) has been a hobby programmer from school days. Codemarvels is his personal blog from the year 2010, where he writes about technology, philosophy, society and a bit about physics. He now runs a conversational AI company - DheeYantra - focusing his efforts to help businesses improve operational efficiency using digital employees powered by AI.
notes/technology

Fix : Docker node down after restartIP Telephony – bit rates of audio formats, and other notes

Posted on October 29, 2020 by Sreekumar Kj / 0 Comment

The bit rates for the most common audio formats – ALAW 8 BITS ULAW 8 BITS PCM 16 BITS SIGNED/UNSIGNED ADPCM 8 BITS The endian-ness for more than one byte system...

notes/technology

Fix: Cannot start container Subnet sandbox join failed error from docker

Posted on October 27, 2020 by Sreekumar Kj

Error : Few docker containers don’t start up. In the /var/log/syslog they give the error “Cannot start container Subnet sandbox join failed…” Fix: Restart the m...

notes/technology

React Ajax call on load gives : “Error: Should not already be working.”

Posted on September 2, 2020 by Sreekumar Kj

Problem : On page refreshes, the ajax calls in the componentDidMount functions throws the error : “Error: Should not already be working.” Reason : Probably the ...

notes/technology

Fix : The repository ‘http://archive.ubuntu.com/ubuntu disco-backports Release’ no longer has a Release file.

Posted on July 26, 2020 by Sreekumar Kj

Issue : When doing an apt update, we get the this error.The repository ‘http://archive.ubuntu.com/ubuntu disco-backports Release’ no longer has a Release file. ...

notes/technology

Cannot connect to DB from a process inside Docker container ? This could fix it.

Posted on July 19, 2020 by Sreekumar Kj / 0 Comment

I had recently hit a blocker to production deployment, when my processes just won’t connect to my Cassandra DB from within their containers. This is how I could...

notes/technology

Open ports in Ubuntu’s firewall using IP Tables

Posted on July 14, 2020 by Sreekumar Kj

On the terminal, do the following to open port 80 sudo iptables -A INPUT -p tcp --dport 80 -j ACCEPT sudo iptables -F Persisting the rule changes across boot cy...

notes/technology

Make a new disk available in Ubuntu on AWS or Azure

Posted on June 26, 2020 by Sreekumar Kj / 0 Comment

To make a new disk you just added to the Ubuntu device, please go through the following steps – Check whats the /dev path of the disk. On terminal, run- You wou...

notes/technology

host-name getting reset after a reboot

Posted on June 11, 2020 by Sreekumar Kj / 0 Comment

Problem: The newly set hostname reverts back to older one after reboot Reason : Hostname is reset by cloud-init Solution : Inactivate cloud-init. On t...

notes

Ubuntu : retain host-name change after a reboot

Posted on June 11, 2020 by Sreekumar Kj

Problem: The newly set hostname reverts back to older one after reboot Reason : Hostname is reset by cloud-init Solution : Inactivate cloud-init. On terminal, k...

Machine Learning

Machine Learning – the basics

Posted on February 4, 2020 by Sreekumar Kj

Hey there ! So you are a programmer, wanting to master machine learning ? You are at the right place. Lets get started. So, what exactly is machine learning ? W...

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