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TILs - Fueling Curiosity, One Insight at a Time

At Codemancers, we believe every day is an opportunity to grow. This section is where our team shares bite-sized discoveries, technical breakthroughs and fascinating nuggets of wisdom we've stumbled upon in our work.

Published
Author
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Giritharan
System Analyst
After pushing my changes to the Fly, I noticed that my Application JS controller wasn't being found. The problem was due to an incorrect line in app/javascript/controllers/application.js. It originally had:


Code

import { application } from "./application";


To fix it, I changed it to:


Code

import { application } from "controllers/application";


These changes ensured that the request was directed to the correct location, and the Stimulus JS controller started working.


#stimulus #assert-not-loading #rails
Published
Author
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Ayush Srivastava
System Analyst
Common procedure to monitor data in Devops Environment

First we need a source of metrics that can be Applications, Databases, Containers etc

After that we need Exporters

Exporters are components that collect and export metrics from various systems, applications, and services, making them available to monitoring tools

Then we need Datasource

Datasource aggregates, stores, and allows querying of the metrics collected from Exporters, making it the data source for visualization tools and alerting mechanisms.

Collected data is stored in Time Series database

A time series database (TSDB) is a special type of database designed to store and manage data that is recorded over time. Each piece of data has a timestamp, which helps keep track of when it was collected.

Then comes the visualisation part

We can use tools like Grafana that make use of the data that is stored in Time Series Database like prometheus to visualise data

#monitoring #devops
Published
Author
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Adithya Hebbar
System Analyst
util.inspect use-case:

• Without util.inspect

Code

const obj = {
  name: "Adi",
  age: 24,
  details: { details1: { details2: { hobbies: "travelling" } } },
};
console.log(obj);
//Output: { name: 'Alice', age: 30, details: { details1: { details2: [Object] } } }


• With util.inspect

Code

import util from "util";

const obj = {
  name: "Adi",
  age: 24,
  details: { details1: { details2: { hobbies: "travelling" } } },
};

console.log(util.inspect(obj, { depth: null, colors: true }));

//Output: { name: 'Adi', age: 24, details: { details1: { details2: { hobbies: 'travelling' } } } }


console.log doesn't show all details of complex objects, especially nested ones or hidden properties. util.inspect gives a complete and customizable view for better debugging and understanding.

#javascript
Published
Author
user-image
Adithya Hebbar
System Analyst
To kill a process running on a specific port in mac:
1. lsof -i :<port_number>
2. Note the PID of the process from the output.
3. kill -9 <pid>
#killprocess
Published
Author
user-image
Ayush Srivastava
System Analyst
Password recovery command for Influxdb when running in local as the UI does not provide any other way to set a new password if you have forgotten


Code

influxd recovery user update \
  --username example-username \
  --password ExAmPL3-paS5W0rD


#influxdb
Published
Author
user-image
Ayush Srivastava
System Analyst
Uninstall / remove a Homebrew package including all its dependencies


Code

brew tap ggpeti/rmrec
brew rmrec pkgname


#homebrew
Published
Author
user-image
Nisanth
Terminating a AWS EC2 Instance #devops #aws

If the Instance is no longer in use and has been stopped, it is necessary to proceed with terminate the Instance. This step ensures that we free up resources, reduce potential security risks, and maintain a clean and efficient infrastructure.

Checklist:
1. Take a Snapshot of the EBS Volume:
◦ It is best practice to take a snapshot of the EBS volume as a backup before decommissioning the service.
2. Verify Terraform Management:
◦ Check if the service is managed by Terraform.
3. Terminate the Instance
Published
Author
user-image
Nisanth
Restarting a DaemonSet in Kubernetes #devops #kubernetes

To find a DaemonSet in a specific namespace:

Code

kubectl get ds -n


To restart the DaemonSet:


Code

kubectl rollout restart ds  -n

Published
Author
user-image
Sujay
Log shipping is a process used in database management to automate the backup and restoration of transaction logs (history of every action) from a primary database server to a secondary standby server. The main purpose of log shipping is to provide a disaster recovery solution, ensuring data availability and integrity in case of a primary server failure
#db
Published
Author
user-image
Vaibhav Yadav
Senior System Analyst
Recently I came across an interesting use case of combining CSS variables with environment variables. The challenge was to change a CSS property, particularly a color, based on an environment variable. Since CSS doesn't support environment variables directly, here's the approach I took:

The global css file:

Code

:root {
  /* ----- fallback value ----- */
  --primary-color: #3498db;
}

h1 {
  color: var(--primary-color);
}


Then, in our React application:

Code

const App = () => {
  const primaryColor = process.env.NAME === 'a' ? '#fff' : '#000';

  return (
    <div style={{ '--primary-color': primaryColor }}>
      <h1>Hello, World!</h1>
    </div>
  );
};


#css #cssvariables #react

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