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.

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Author
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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
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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
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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
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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
Published
Author
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Vaibhav Yadav
Senior System Analyst
Using choice Input in GitHub Actions

Choice input in Github actions can be used to provide a predefined list of options for workflow dispatch events. This makes it easier for users to select from a set of valid options when triggering workflows manually.

Example:


Code

name: Example Workflow

on:
  workflow_dispatch:
    inputs:
      environment:
        description: 'Select the environment'
        required: true
        default: 'sandbox'
        type: choice
        options:
          - sandbox
          - uat
          - production

jobs:
  example_job:
    runs-on: ubuntu-latest
    steps:
      - name: Display Inputs
        run: |
          echo "Environment: ${{ github.event.inputs.environment }}"


#githubactions #devops #automation #dropdown
Published
Author
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Adithya Hebbar
System Analyst
To generate an Entity-Relationship Diagram (ERD) using Prisma-erd-generator, follow these steps :
• Install the following package

Code

npm i -D prisma-erd-generator @mermaid-js/mermaid-cli
# or
yarn add -D prisma-erd-generator @mermaid-js/mermaid-cli


• Add this to your schema.prisma

Code

generator erd {
  provider = "prisma-erd-generator"
}


• Run the generator

Code

npx prisma generate


#javascript #erd
Published
Author
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Adithya Hebbar
System Analyst
To use Client Components, states, useState, useEffect, onClick, and other client-side features, add "use client" at the top of your file. This ensures the component runs on the client side.

#javascript #nextjs
Published
Author
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Adithya Hebbar
System Analyst
Key difference between App router and Page router :

App Router:
• File-based routing: Uses nested folders to define routes.
• Components: Server Components by default.
• Data fetching: Uses fetch function.
• Layouts: Can be nested and dynamic.
• Dynamic routes: Supported, but syntax differs.
• Client-side navigation: Supported with router.push.
• Priority: Takes precedence over Page Router.
Page Router:
• File-based routing: Files directly represent routes.
• Components: Client Components by default.
• Data fetching: Uses getServerSideProps, getStaticProps, getInitialProps.
• Layouts: Static.
• Dynamic routes: Supported.
• Client-side navigation: Supported with Link component.
• Priority: Fallback if no matching route in App Router.
#javascript #nextjs
Published
Author
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Soniya Rayabagi
How to schedule tasks using cron expressions in GitHub Actions:
By defining a cron schedule in the workflow YAML file, we can automate the execution of tasks at specific intervals.
For instance, setting */5 * * * * in the cron expression triggers the workflow every 5 minutes.
Monitoring workflow runs in the "Actions" tab of the GitHub repository allows to verify that the scheduled tasks are executing as intended.
#cronjobs #workflowautomation
Published
Author
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Mahesh Bhosle
DevOps Engineer
When terraform state file is locked and you are unable to acquire a state lock, you can use terraform force-unlock <LOCK_ID> to forcefully remove the lock.
#terrafrom

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