TL;DR TL;DR A Terraform variable cannot refer to another variable. default = "app-${var.env}" fails with Error: Variables not allowed ... Variables may not be used here. The same error appears for a reference inside terraform.tfvars. The fix is to compute the combined value in a locals block: full_name = …

1. Introduction Infrastructure as code (IaC) is a key part of gaining efficiency, scalability, and manageability in the rapidly changing tech world of today. Many DevOps teams now use Terraform, which is a famous IaC tool. The Terraform lookup function for dynamic keys has become a powerful way to improve your IaC …

Introduction There are a couple of ways in which you can securely connect to a remote server using Ansible. Using the SSH Keys (Public, Private) Using the remote server password Both methods are widely used by DevOps practitioners, and both are secure. But still, if I would like to vote for Using the SSH keys for …

Table of Content What is YAML? Example of YAML? Why Ansible needs YAML? Example of Ansible Playbook written in YAML What are rules for writing Ansible Playbook using YAMLs? Advantages of YAML in Ansible YAML vs Other Data Serialization Formats What is YAML? YAML is a recipe for computers that helps them understand what …

This blog post will guide you on how to use Terraform-Provisioners to copy/upload files to EC2 as well as the S3 bucket. Table of Content Pre-requisites Setup AWS credentials in the Terraform file Setup an EC2 instance, a security group, and SSH key pair resources. Use file provisioner to upload the file to EC2 Upload …

In this blog post we will take a look on how to fix the issue of Error: Creating EC2 Subnet: InvalidSubnet.Range: The CIDR '100.1.1.0/24' is Invalid Error: creating EC2 Subnet: InvalidSubnet.Range: The CIDR '100.1.1.0/24' is invalid Table of Content Introduction Understanding the Error InvalidSubnet.Range Error CIDR …

I got stuck with the error InvalidParameter: Security group sg-08e153383fca86934 and subnet subnet-00e3adcfceb3cf8ee belong to different networks when I was working on one of AWS project where I need to set-up following using Terraform - VPC Subnet Internet Gate, NAT Route Table EC2 Instance Security group Here is the …

Cron jobs are undoubtedly among the easiest and most often used methods for task scheduling. It is easy to see why every Linux user is familiar with cron jobs: they are highly helpful Simple to set up Need very little maintenance. We will go through using Cron Jobs in Docker containers in this tutorial. Table of …

When working with Docker containers, one of the most common tasks is to copy a file from the local host into a container - a config file you want to try, a certificate, a script, a database dump. And almost as often, the other way round - a log file or a generated report out of the container onto your laptop. In this …

TL;DR Wrap the commands in a shell: command: sh -c "echo one && echo two". Compose does not run a shell for you. Without sh -c, Compose silently drops everything after &&, ; or |. command: echo one && echo two printed only one, and docker compose config shows the parsed command as …