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Category: Technology

Notes/Technology

SSH without running .bashrc

Posted on December 8, 2021 by Kj / 0 Comment

In case a faulty script started by .bashrc or .profile is failing and crashing SSH initiation, you could still login and fix the issue by running shell directly...

Technology/Tutorial / Run-book

Migrate data from one Cassandra server to another using medusa

Posted on December 8, 2021 by Kj / 0 Comment

Here are the steps I followed to get my dev instance of cassandra copied to a new server (both single node instances) I’ve used medusa tool for the same. ...

Notes/Technology

Flush DNS cache in Ubuntu 20.xx and above

Posted on July 30, 2021 by Kj / 0 Comment

On bash, run – sudo systemd-resolve --flush-caches Should be done. KjKj [/.] Sreekumar programs computers as a hobby and profession. Into programming from...

Notes/Technology

Change the datacenter set in cassandra-rackdc on Ubuntu

Posted on July 19, 2021 by Kj / 0 Comment

Problem: Changing just the datacenter name in cassandra-rackdc.properties gives the error: Cannot start node if snitch's data center [newName] differs from prev...

Notes/Technology

RabbitMQ installation fails in in the last leg of setting up in ubuntu 20.04

Posted on June 2, 2021 by Kj / 0 Comment

Error: Reason: libtinfo.so library missing. Solution: Note: No need to reattempt the installation. KjKj [/.] Sreekumar programs computers as a hobby and profess...

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...

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  • SSH without running .bashrc
  • Migrate data from one Cassandra server to another using medusa
  • A JS assistant to remind us to exercise during WFH days
  • Flush DNS cache in Ubuntu 20.xx and above
  • Change the datacenter set in cassandra-rackdc on Ubuntu

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