connection refused – :econnrefused PostgreSQL service status First parameter to cross-check during a psql connection refused error is the status of the PostgreSQL service. We can confirm this by cross-checking if a Postgres process in running in the server. In a Linux like environment, we can use If the service is not running in the…
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Tier0 – Common Bootstrap
Table of Contents 1Overview 2Deploy DFPC Tier0 Common Bootstrap 2.1Storage Accounts 2.1.1network_rules 2.2Keyvault 2.3Backup Policies 3Network 3.1Subnets 3.2User Defined Route(Azure route table) 3.3Traffic analytics 3.4VNet Peering 3.5Providers Overview The purpose of this effort is to have efficient documentation about Bootstrap Tier consisting of all necessary pre-requisites. By consuming Tier0 of DFPC module we can create…
How to Set Up Pre-commit
pre-commit hooks are a mechanism of the version control system git. They let you execute code right before the commit. I highly recommend using WSL/WSL2 with Ubuntu and following the Ubuntu installation guide. Install dependencies You need to install terraform-docs and TFLint dependencies to execute our pre-commit successfully. Click the link to follow the instruction….
Terraform Certification – Input Variables and Outputs
Variables and Outputs Terraform can accept values as input, transform values inside a configuration, and return values as output. There’re three different concepts to consider when working with data in a Terraform Input variables (variables) : used to pass information to a Terraform configuration Local values (locals) : computed values inside the configuration that can…
Terraform Modules
A terraform file can get very large very quickly as you add more and more resource blocks. Custom modules are a great way of organizing your terraform code into logical pieces. You might have one module that handles the VPC set up, and another for EC2 instances. In this post, I will look at how…
Building Containerized Microservices in Golang Chapter 3 – Docker
I’m going to create two types of docker files. One for the local testing, and one for the production. Before creating the docker file, I want to create the docker ignore file because geometry and static folders are not used. Create dockerfile build and run The problem of this image has 974MB which is way…
My Best Work Experience – Republic of Korea Army
While studying Amazon Leadership Principle, it reminds me of when I enlisted in the army. I was assigned a squad leader in training school. However, the team wasn’t motivated and disgruntled at all. Because in South Korea, all men between 18 and 28 years old are required to serve 2 years of military service. People…
Measuring Reward and Risk of an Investment
Let’s load the msft.csv dataframe and make it chart: we can get some summary statistics by using this commnad: Mean return is the performance metric for the reward so we have daily mean return of 11 percent. The standard deviation of returns is the metric for the risk (volatility) which is 1.72 Calculate daily returns…