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Author: Kj

Kj [/.] Sreekumar programs computers as a hobby and profession. Into programming from his school days, Sree uses Codemarvels to key in facts and fixes he finds interesting while working on different projects. Some of the articles here give away a few shades of his philosophical leanings too.
Notes/Technology

Fix : Docker node down after restart

Posted on November 5, 2020 by Kj / 0 Comment

Problem: One of the docker nodes does not start up after restart. Error in the log is msg="error removing task " error="incompatible value" Reason: Docker swarm...

Notes/Technology

IP Telephony – bit rates of audio formats, and other notes

Posted on October 29, 2020 by 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 ...

Notes/Technology

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

Posted on October 27, 2020 by Kj / 0 Comment

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

Notes/Technology

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

Posted on September 2, 2020 by Kj / 0 Comment

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

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 Kj / 0 Comment

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 Re...

Notes/Technology

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

Posted on July 19, 2020 by 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...

Notes/Technology

Open ports in Ubuntu’s firewall using IP Tables

Posted on July 14, 2020 by Kj / 0 Comment

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

Posted on June 30, 2020 by 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- Y...

Notes

Ubuntu : retain host-name change after a reboot

Posted on June 11, 2020 by 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 terminal, k...

Machine Learning

Machine Learning – the basics

Posted on February 4, 2020 by Kj / 0 Comment

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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Recent Posts

  • Fix : Docker node down after restart
  • IP Telephony – bit rates of audio formats, and other notes
  • Fix: Cannot start container Subnet sandbox join failed error from docker
  • React Ajax call on load gives : “Error: Should not already be working.”
  • Fix : The repository ‘http://archive.ubuntu.com/ubuntu disco-backports Release’ no longer has a Release file.

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