AWS

Tuning concurrency settings for AWS S3 CLI

Tuning the max_concurrent_requests configuration for better performance when copying files from S3 buckets using the AWS CLI S3.

internet explorer

Using X-UA-Compatible to render websites in compatibility mode.

Add X-UA-Compatible meta tags or headers to force Internet Explorer to run websites in compatibility mode. the same can be done by forcing http headers on web servers

node

Fix for 100% CPU usage by node.js

If you are on MacOs and you don't have installed fsevents, you might see a spike in CPU usage when running projects which watches the filesystem changes, especially projects like Webpack. To fix the issue, install fsevents or rebuild using fsevents.

docker

Making dependent services wait till containers are healthy using docker health check

Using the health check option provided by docker we can make containers wait till the dependent containers are online and healthy

elixir

How to make a Genstage consumer subscribe only to particular events or stream

Genstage consumer can optionally subscribe to some of the events produced by the producer by using GenStage.BroadcastDispatcher as dispatcher and by specifying a :selector function which filters out the events we are interested in

linux

Extending the disk space on an EC2 instance

How to extend disk space on an AWS EC2 instance or Elastic BeanStalk instance by extending the Elastic Block Store volume and resizing the partition

blog

Upgrade ghost from v0.11 to v1.0+ and tweak Casper theme layout to use list instead of cards

How to update ghost from version v0.11 to v1.0 and up and tweaking the default casper theme for lists instead of cards, adding syntax highlighting, and bigger fonts

adobe

How to disable Adobe Flash Player update notification

Well, lets not talk about the history/legacy of Flash/HTML5 etc here. Flash has its place but its really annoying when the Adobe Flash Player updater pops in when you are working on something important and distracts you. And even worse, you are presented with only option to Remind

ruby

Disable pry and exit debugger without killing the main program in Ruby

You ever ran into a situation where you had a huge loop running and you put a binding.pry within that loop for debugging and wondered how the hell you would exit the debugger? The answer is simple disable-pry is your saviour.! via GIPHY This has got its downside though,

postgres

Don't forget to update the sequence in PostgreSQL after a COPY command

You might have noticed that after bulk inserting records using the COPY statement in PostgreSQL the sequence IDs are not getting updated for any further inserts later on, and it would throw duplicate sequence ID errors. So you would be wondering what makes this COPY statement different that it does

postgresql

Copy data from one postgres instance to another. remote copy options explored: Copy, CSV and STDIN

Various options to copy data from one Postgres database/table to another Postgres database or table using copy command.

postgresql

Escape character sequence "E" in PostgreSQL explained

What's the "E" before a Postgres statement mean? Explaining the postgreSQL escape character sequence.

rake

Passing multiple options/argument with default options in rake

Rake task allows you to accept multiple arguments which can be used within the task, and also allows us to specify default options for these arguments. Accept multiple arguments/options Lets say we have a simple rake task to sync data from/across our servers to different enviroments. We can

rails

How to fix the Index name too long error in rails migrations

Today, I was reviewing some legacy code, trying to isolate the bottlenecks and pinpoint the optimisation strategies for scaling and performance optimisations of a rails app. As the usual procedure, I wanted to check the database indexes and see if something was missing here. And my guess was in the

SQL

Find out which part of your code is triggering ActiveRecord or SQL queries.

Today, I got a new pet project to play with and my job was to identify the bottlenecks and performance improvements we can make in the application. So I wanted to jump in and wanted to see what SQL queries were being triggered when someone requests data. Going through the

ssh

Bypassing ssh firewall by overriding Type of Service headers for TCP packets in routers

I was recently having issues when trying to ssh into one of my servers. The normal debugging techniques and solutions didn't work for me and I had to debug this in depth to figure out the issue was actually with my router blocking the packets The actual problem.

git

Debugging Git network connection issues using GIT_TRACE

I have been travelling a lot this month and working remotely from cafes and public places during my stay in Europe. And most often I was connected to the internet using the public hot spots or free Wifi provided by the cafes or restaurants. The quality of the connections were

ruby

Script/runner vz Rake tasks

When it comes to running Rails tasks the common question that comes to mind is whether to use script/runner or to call a rake task script/runner long_running_task VZ rake long_running_task To understand it better we need to understand how both works under the hood.

ruby

Elegant way to silently ignore a Ruby exception

I was working on a small hobby project and wanted to ignore some of the Exceptions that were raised. The first version of the code that I wrote was something similar to: def ignore_exception begin yield rescue Exception end end and using ignore_exception { puts "Ignoring Exception"

osx

brew cask: Error: Unknown command: cask

After upgrading my OS to Sierra I was having an issue with homebrew. It failed to recognize the cask command and was throwing an error: brew cask install haskell-platform Error: Unknown command: cask Brew wasn't able to find the correct path and was causing this issue. Fix: brew

devops

Manage sidekiq workers using deployment setup and Capistrano

In real world, most of the Rails applications would be having a Sidekiq instance as its companion in production systems. And it's a necessary thing to have some sort of mechanism to manage your Sidekiq instance with your deployment setup. In this post, I am going to throw

rails

How to turn on SQL debug logging for ActiveRecord

If you want to see the SQL queries that your apps are running and want o optimize them or tune them, then it is a nice idea to log them. You can either log it to your log file or even to STDOUT. You can set the log level in

js

How to fix Npm install failed with "cannot run in wd"

I was trying to upgrade my blogs ghost version to 0.9(which btw has some cool features) and I stumbled upon an issue when trying to upgrade the packages. Every time I run sudo npm install --production on my server, I get the following error: npm WARN cannot run

docker

Copy file from host machine to docker container

The docker cp utility copies the contents of SRC_PATH to the DEST_PATH. You can copy from the container’s file system to the local machine or the reverse, from the local filesystem to the container. If - is specified for either the SRC_PATH or DEST_PATH, you

ruby

How to load rake task from a custom file or directory

If you are wondering how you can load a rake task from a custom file, then this is guide will help you to accomplish your task. Lets assume you have a rake task named hello.rake under your project directory's lib folder like: <project>/lib/tasks/