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Practical rsync command and options

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10/25/2018 04:45:00 pm

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Harish Kannarao

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Import self signed in Linux for Chrome / Chromium headless testing

12/18/2017 05:57:00 pm

Chrome / Chromium browser offers headless mode, which is quite useful to run tests via Selenium WebDriver in CI servers. However under some circumstance your test will hit a server with self signed certificate or invalid certificate or expired certificate. This may happen for developers trying to write tests against a server started on localhost with self signed certificates or testers trying to write tests against non-production servers with expired certificates (invalid certificates). Chrome / Chromium browser ignores the SSL errors when running in non-headless mode. However in CI servers, then it should be running in headless mode and currently we cannot ignore the SSL errors for tests accessing non-localhost websites. This blogs explains the steps for import a certificate into Linux's trust store, which will make the Chrome / Chromium browser to trust the self signed certificate. Please do not apply these steps in production servers as it will make server vulnerable to ...

JSON with curl and jq

6/21/2018 06:19:00 pm

This blog post captures some quick commands to deal with JSON from servers (Http APIs) using curl and jq command line tools About Jq: https://stedolan.github.io/jq/ Install jq: Mac: brew install jq Ubuntu or Debian: sudo apt-get install jq Sample JSON content: Assume the following JSON content will be returned from URL http://api.example.com/some-json-content { "user_name": "User 123", "some_other_field": { "sub_field": "sub_value" }, "array_field": [ { "field1": "value1", "field2": "value2" }, { "field1": "value3", "field2": "value4" } ] } UR...

Blazemeter Taurus load testing and offline jmeter html report

9/20/2018 09:14:00 am

Recently I had used Blazemeter Taurus for load testing my application and I was quiet impressed with the features offered by Taurus. It is not a new tool by itself, instead it makes use of existing load testing tools like Apache JMeter or Gatling. However it offers enough abstraction to users from the underlying load testing tool using YAML configuration files. Advantages of using Taurus over JMeter 1) JMeter uses single jmx xml file to simulate the load test, which makes it hard for more than one person to work on the single jmx file and resolving conflicts might turn tricky 2) Easy to review changes made to the Taurus YAML file on commit by commit basis to understand the changes made to the load testing. This is especially handy during pull request process 3) Easy to run in non-interactive command line mode, so easy to integrate with CI tools 4) Official docker image provided by Blazemeter Taurus, which required minimal setup to run load test in development machines and also ...

Export/Backup Ollama Model

3/12/2025 11:59:00 am

The following commands help to export/backup the ollama models which allows to quick restore the models or setup an offline machine using file transfer. Pull a model from registry ollama pull llava:7b Export the model mkdir -p llava_7b_backup cd llava_7b_backup ollama show --modelfile llava:7b > Modelfile cat Modelfile | grep -E '^FROM' | cut -d ' ' -f 2 | xargs -I {} cp {} . cat Modelfile | grep '# FROM' | cut -d ' ' -f 3 | xargs -I {} echo 'ollama create {} -f Modelfile' > readme.txt sed -i '' -E 's/^FROM.*blobs/FROM ./g' Modelfile Import the model cd llava_7b_backup ollama create llava:7b -f Modelfile Run the model ollama run llava:7b Remove the model ollama rm llava:7b

Install and Switch multiple versions of Java JDK on Linux or MacOS

7/15/2019 02:03:00 pm

While working on enterprise level, we often have java projects running on older versions of java for legacy reasons. Hence it is not very uncommon for a developer to have multiple versions of JDK installed in their machines and easy way to switch different versions of JDK on demand for running the build. This blog explains the steps needed to setup and configure multiple JDK versions on Mac OS. Get the architecture of the Machine from Terminal using: uname -m Create a directory for installation: mkdir -p $HOME/tools/java Download java binaries: Download java 25 and 21 binary for Linux / Mac OS operating system with the correct architecture type to directory $HOME/tools/java Download URL https://adoptium.net/en-GB/temurin/releases?mode=filter&os=any&arch=any Extract and rename java binaries: find $HOME/tools/java -type f -name OpenJDK25*.tar.gz | xargs -I {} mv {} $HOME/tools/java/OpenJDK25.tar.gz find $HOME/tools/java -type f -name OpenJDK21*.tar.gz | xargs -I {} mv {} $HOM...

Bash Script Example

11/15/2018 02:38:00 pm

calculate.sh

Kotlin / Ktor / Jdbi Json / Api / Free Marker / VueJs

6/13/2019 04:50:00 pm

About this blog A brief reason for writing this blog. I am a server side http api / web developer predominantly using JVM based languages. Recently I started using Kotlin programming language (developed by JetBrains) with Spring Boot Framework on AWS cloud to build an enterprise solution (including both API and small web portal for internal Admins) to serve data for the mobile apps. I loved Kotlin as a programming language for Server Side development. So I was curious to explore Ktor Framework (developed and sponsored by JetBrains) for Server Side Web Development (API & Webpages). Hence I created a sample repository in Git Hub to play with Ktor Framework to experiment with various enterprise grade features offered by Ktor Framework. Please read this blog in conjuction with my Kotlin repository available at https://github.com/harishkannarao/kotlin High Level Components Diagram API The API development was very very simple with Jackson / Google GSON integration. The...

Essential Gradle Commands

2/26/2018 01:36:00 pm

I use some of the gradle commands everyday in my project and many times I had to randomly search in the internet (as I don't remember these commands by heart). This article is for my personal reference, so that I don't have to search it in random places. These commands include running tests, generating binaries, filtering tests, changing property values during runtime, listing available tasks for a project, executing task in a subproject, printing dependencies information etc.. If you have reached this paragraph and your are still interested in reading further down, then happy reading.. :) For developers working on Windows platform, please replace './gradlew' with gradlew.bat in the following commands General gradle tasks List available projects ./gradlew projects List available properties ./gradlew properties List available tasks for root project and sub-project ./gradlew tasks :SomeProject:tasks --all Build a project Clean the buil...

Installing chromedriver for Selenium WebDriver testing

1/26/2018 03:25:00 pm

For Mac: Using homebrew: brew install --cask chromedriver chromedriver --version Using manual steps: Add the following lines to ~./bash_profile or ~/.zprofile using vi or nano or any text editor # Installing Chrome Driver export CHROME_DRIVER_HOME=/downloaded_and_extracted_location/chrome_driver_2.33 export PATH=$CHROME_DRIVER_HOME:$PATH Verify the installation by executing the following command in Terminal chromedriver --version For Windows: Add c: \downloaded_and_extracted_location\chrome_driver_2.33\chromedriver to PATH environment variable (most probably through My Computer). Verify the installation by executing the following command in Command Prompt chromedriver --version For Ubuntu (Linux): sudo apt-get install chromium-browser sudo apt-get install chromium-chromedriver sudo ln -s /usr/lib/chromium-browser/chromedriver /usr/local/bin/chromedriver chromium-browser --version chromedriver --version For Debian (Linux): s...

Empowering Backend Engineering Team

5/05/2020 03:56:00 am

I am writing this blog to share the ideas and concepts which will empower the backend developer, devops engineer and QAs. Terraform Presentation Slide These ideas are not tied or limited to particular framework or libraries or cloud providers, instead these can be in many different ways using different tool sets which the team might already be familiar with. To achieve these end goals, the backend application and devops toolsets should be complementing each other in various aspects. I am going to list out the desired features I would like to have in my project / team under various categories. I have also created the following sample repositories on github to showcase these ideas in a simplified way. Sample Java Spring Boot application with Maven: https://github.com/harishkannarao/MySpringBoot Sample QA Acceptance tests with Gradle: https://github.com/harishkannarao/gradle-qa-acceptance-tests Sample Infrastructure as Code in AWS with Terraform: https://github.com/ha...

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