Articles by Deepak Prasad
Helm Hybrid Operator Tutorial Part 2 of 2 - Custom Status, Finalizer, Drift, Cross-CR
Part 2 of the Helm hybrid operator tutorial: the features the pre-built helm-operator binary cannot provide, written in roughly 200 lines of Go on top of the foundation built in Part 1. Custom status fields including a …
Helm-Based Operator Tutorial Part 2 - Lifecycle, Drift, Hooks, Scope, and the Hard Ceiling
Part 2 of the Helm-based operator tutorial picks up the moment Part 1 ends - you have a deployed operator with a running CR. This guide walks the rest of the pre-built helm plugin (helm.sdk.operatorframework.io/v1) in …
Create and Mount Filesystems in Linux
Create ext4, XFS and VFAT filesystems in Linux with mkfs: identify the right block device, add labels, mount and unmount, read capacity correctly, and check or repair each filesystem type.
at Command in Linux to Schedule One-Time Tasks
Schedule one-time tasks in Linux with the at command: start atd, write relative and absolute time specs, list jobs with atq, inspect with at -c, cancel with atrm, capture job output, and control access with at.allow and …
Update and Upgrade 389 Directory Server Safely
Update 389 Directory Server safely with dnf, pre-upgrade health checks, verified backups, standalone and rolling replica updates, post-upgrade validation, and recovery when a package update fails.
SQL Date Format Explained with Examples
Different types and formats of SQL date format explained with examples. SQL datetime format syntax, type and examples. sql server date format.
How to configure or build ceph storage cluster in Openstack ( CentOS 7 )
Step by step guide to build ceph storage cluster in Openstack CentOS 7 Linux on virtual machine. Confiure OSD, mon using ceph-deploy tool for ceph cluster
Terraform Cheat Sheet: Commands, HCL Syntax and Examples
Scan-first Terraform cheat sheet for CLI commands, configuration files, HCL syntax, variables, expressions, count and for_each, state and import, modules, workspaces, and debugging — with links to full tutorials.
Terraform State Explained with Examples
Learn what Terraform state is on Ubuntu — terraform.tfstate purpose, configuration vs real infrastructure, terraform show and state list, drift, sensitive data, Git rules, local vs remote state, and a full local_file …
Terraform Providers: Configuration and Aliases
Learn Terraform providers on Ubuntu — required_providers, provider blocks, aliases, terraform init installation, terraform providers, local and Docker examples, and common provider errors without cloud credentials.
terraform destroy Command with Examples
Learn terraform destroy on Ubuntu with the Docker provider — provision disposable resources, preview with plan -destroy, confirm or auto-approve teardown, use -target safely, and understand state and configuration after …
terraform validate Command with Examples
Learn terraform validate on Ubuntu — what it checks, syntax and schema errors with real output, validate -json for automation, init -backend=false for CI, and how validate differs from plan and fmt.
terraform fmt Command with Examples
Learn terraform fmt on Ubuntu — rewrite .tf files to canonical style, use -check and -diff, format recursively, enforce formatting in CI, and see how fmt differs from terraform validate.
terraform apply Command with Examples
Learn terraform apply on Ubuntu with the Docker provider — interactive approval, saved plans, -auto-approve, -var and -var-file, in-place updates, -replace, partial failure behavior, and independent resource …
terraform plan Command with Examples
Learn terraform plan on Ubuntu with the Docker provider — read execution plan output, preview create/update/replace/destroy, save plans with -out, and use -var, -destroy, -refresh-only, -detailed-exitcode, -target, and …
Terraform init Command with Examples
Learn what terraform init does on Ubuntu — backend and provider setup, module downloads, .terraform directory, .terraform.lock.hcl, common flags, and when to reinitialize a working directory.
Terraform HCL Syntax and Configuration Files
Learn Terraform HCL syntax on Ubuntu — blocks, labels, arguments, expressions, comments, .tf and .tf.json files, multi-file layouts, terraform fmt, validate, and common syntax errors with real fixes.
Set Up a Terraform Lab on Ubuntu with Docker
Prepare a single Ubuntu VM with Docker, helper tools, isolated Terraform working directories, and optional plugin cache so you can practice init, plan, apply, and destroy without cloud credentials.
Install Terraform on Ubuntu
Install Terraform on Ubuntu 26.04 from the official HashiCorp apt repository, verify with terraform version, install a specific package version or upgrade, install the release binary with checksum verification, and …
What Is Terraform? Infrastructure as Code Explained
Learn what Terraform is and how infrastructure as code works — declarative configuration, providers, resources, state, the init plan apply workflow, realistic use cases, and a local example on Ubuntu without a cloud …
Terraform Architecture: How Terraform Works
Learn how Terraform works architecturally on Ubuntu — configuration, Terraform Core, provider plugins, dependency graphs, how state differs from desired configuration, what init plan and apply do internally, resource …
HCP Terraform Workspaces and Projects
Organize Terraform in HCP Terraform on Ubuntu — how a workspace holds one collection of infrastructure with its own state and runs, how projects group and scope those workspaces, how HCP workspaces differ from Terraform …
HCP Terraform Variables and Variable Sets
Supply values to HCP Terraform runs from an Ubuntu host — how Terraform variables differ from environment variables, how workspace variables and variable sets at workspace, project, and organization scope combine, the …
HCP Terraform Tutorial: CLI and Remote Runs
Connect the Terraform CLI to HCP Terraform on Ubuntu — authenticate with terraform login, add a cloud block, initialize a CLI-driven workspace, trigger remote plan and apply runs that stream to your terminal, confirm …
HCP Terraform Collaboration and Governance
Understand HCP Terraform governance on Ubuntu — how teams and permissions scope access across organization, project, and workspace levels, how Sentinel and OPA policy sets evaluate plans, why teams use the private …
Terraform Provider Aliases with Modules
Pass default and aliased provider configurations into Terraform child modules on Ubuntu — provider requirements versus configurations, automatic inheritance, providers meta-argument mapping, configuration_aliases, count …
Fix Terraform "Functions May Not Be Called Here" Error
Fix Terraform Functions may not be called here on Ubuntu — reproduce the error from timestamp in a variable default, move the calculation to locals, use functions in resource expressions, dynamic null-default fallback, …
Remove a Terraform Resource Without Destroying It
Stop managing Terraform resources without deleting real infrastructure on Ubuntu — why removing a block plans destroy, removed block with destroy false, terraform state rm, independent verification with cat and docker …
Terraform Module Outputs with count and for_each
Read Terraform module outputs when count or for_each creates multiple instances — single module references, indexed and splat syntax, conditional count with one, keyed for_each access, aggregating outputs with for …
Terraform templatefile with JSON and YAML
Generate JSON and YAML from Terraform without broken escaping — templatefile basics, passing template variables, jsonencode and yamlencode for nested structures, template loops when text formatting matters, heredoc …