Blog

If you are anytime stuck in a shell where you want to transfer files out of it, and do not have full access such as kubectl or docker exec. Here is the nifty hack: Method 1 (Using ngrok): Run a ngrok tunnel on the target computer ngrok http 5000 Run a simple node program to capture request body const express = require('express') const app = express() const port = 80 var bodyParser = require('body-parser') app.post('/',...

I have occasionally got the error while starting IntelliJ IntelliJ cannot launch because 'process 2' already running The process ID sometimes changed, restarting or even re-installing Intellij doesn’t solve the problem. I run the Flatpak version of IntelliJ There are multiple threads for this online which suggest different solutions: https://intellij-support.jetbrains.com/hc/en-us/community/posts/13541697317906-Error-while-opening-intellij-Cannot-connect-to-already-running-IDE-instance-Exception-Process-2-837-is-still-running- https://intellij-support.jetbrains.com/hc/en-us/community/posts/10865358461202-Intellij-cannot-launch-because-process-2-already-running https://askubuntu.com/questions/1462372/ubuntu-cannot-launch-intellij-anymore https://www.reddit.com/r/pycharm/comments/15esk6r/cannot_connect_to_already_running_ide_instance/ The root of the problem is the .lock file which IntelliJ creates while starting up. If there is a unclean shutdown, there...

Recently I faced boot failure after upgrading my Arch Linux system. The error was ERROR: device 'UUID=1dd743ed-e0a5-4b0c-80ee-186e89eea401' not found. Skipping fsck. mount: /new_root: can't find UUID=1dd743ed-e0a5-4b0c-80ee-186e89eea401. ERROR: failed to mount '1dd743ed-e0a5-4b0c-80ee-186e89eea401' on real root You are now being dropped into an emergency shell. sh: can't access tty; job control turned off [rootfs ~]# _ This could happen while building errorneous initramfs image It was evident from /var/log/pacman.log logs [2023-10-04T20:36:26+0530] [ALPM] running '90-mkinitcpio-install.hook'... [2023-10-04T20:36:26+0530] [ALPM-SCRIPTLET] ==>...

What is vitess? Vitess is a scaleable databases built on top of MySQL. One key feature of vitess is that it supports sharding. Checkout Vitess website for more information As part of working with Vitess, I have provisioned a set of Ansible roles which help in setting up Vitess in vagrant / staging / production infrastructure. Check out the github repo for more information.

For me, Vagrant is the ultimate tool to simulate production like envrionments in the development machine. Some people prefer Docker as an alternative to Vagrant, because of being lightweight and quick to provision. However, I feel Docker and Vagrant have their own places and their responsibilities do not overlap. Let me explain why. Docker is good for running application services. Ultimately, now a days, since production code is deployed in containers itself, docker provides good...

Recently, I was faced with a situation where I had to process huge (in order of several gigabytes) log files. The log files consisted of either CSV format or AWS ALB logs format Here the process means, I had to process each row to either filter it or store the valuable information from it for later analysis. First, I attempted with python to parse it with the simple logic file_name = home + '/Downloads/huge_file.csv' filtered_rows...

I have published the v1.4 of LeetCode Format which supports the new UI of LeetCode Please download or update your already installed extension to get it working on Latest LeetCode UI. Download here for Chrome

I just upgraded from zsh v5.5 to zsh v5.9 and some of my applications broke. It seems the environment variable $XDG_DATA_DIRS was blanked out in the process. $XDG_DATA_DIRS holds the location of directories which can contain .desktop files. The .desktop files are basically application shortcuts in the Linux desktop world. The $XDG_DATA_DIRS and several such variables are initialized by scripts placed in /etc/profiles.d folder. This folder is executed by the /etc/profile script. Now, the twist...

It seems taking memory dump of JVM applications have changed in recent versions. Pre java11, heap dump was takn using the jmap command as follows: ➜ ~/.sdkman/candidates/java/11.0.12-open/bin/jmap -dump:live, format=b,file=dump.hprof 169213 Error: More than one non-option argument Cannot connect to core dump or remote debug server. Use jhsdb jmap instea However, it doesn’t work in Java11. The new command is: ➜ ~/.jdks/corretto-11.0.13/bin/jhsdb jmap --binaryheap --dumpfile heap.hprof --pid 169213 Attaching to process ID 169213, please wait... Debugger...

AWS Lambda is a great way to build serverless applications. However, there lot of limitations imposed by AWS Lambda. For example, one of the limitations is that the payload size of the lambda is restricted to 6 MB, when using it synchronously This makes, Lambda ineffective to serve binary files such as videos, PDF’s etc. However, there is nifty workaround for this limitation, which is using S3 pre-signed URL’s The idea is to upload the...