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Browse all our DevOps articles, tutorials, and guides
How to Use the AWS account_id Variable in Terraform
Learn how to dynamically retrieve and use the AWS account_id variable in Terraform for your configurations.
Command to Delete All Pods in All Kubernetes Namespaces
Learn how to delete all Pods across all namespaces in Kubernetes using a single command. Understand the implications and best practices for this operation.
Terraform Conditionals: Handling Non-Existent Variables
Learn how to use Terraform conditionals to handle cases where a variable does not exist or is not defined.
How Docker Differs from a Virtual Machine (And Why It Matters)
Containers and virtual machines both isolate environments, but they work in very different ways. This guide explains the key differences and when to use each.
How to Copy Docker Images Between Hosts Without a Repository
Learn how to transfer Docker images directly between machines when a container registry is unavailable or impractical.
How to Access a Docker Container's Shell
Learn various ways to get shell access to your Docker containers for debugging, configuration, and maintenance tasks.
Understanding the Difference Between CMD and ENTRYPOINT in Dockerfiles
Learn how CMD and ENTRYPOINT instructions work, how they interact with each other, and when to use each one for more flexible Docker containers.
How to Copy Files from Docker Containers to the Host Machine
Learn efficient ways to extract and retrieve files from your running or stopped Docker containers to your host filesystem.
How Can I Trigger a Kubernetes Scheduled Job Manually?
Learn how to manually trigger a Kubernetes Scheduled Job to run on demand. Understand the steps, commands, and best practices for this operation.
Connecting to Host Machine's Localhost from a Docker Container
Learn how to properly connect to services running on your host machine from within Docker containers
Understanding the Difference Between COPY and ADD in Dockerfiles
Learn when to use COPY vs ADD instructions in your Dockerfiles for better security and build performance
Namespace "Stuck" as Terminating: How Do I Remove It?
Learn how to resolve the issue of a Kubernetes namespace stuck in the Terminating state. Understand the causes and steps to fix it.
How to Switch Namespace in Kubernetes
Learn how to switch between namespaces in Kubernetes using kubectl commands and configuration files. Understand the importance of namespaces and practical examples.
How Do I Force Kubernetes to Re-Pull an Image?
Learn how to force Kubernetes to re-pull container images to ensure your Pods use the latest version. Understand the steps and implications of this operation.
Best practices when using Terraform?
Discover essential best practices for using Terraform to manage your infrastructure effectively and securely.
How to create an SSH key in Terraform?
Learn how to generate and manage SSH keys in Terraform for secure access to your infrastructure.
Kubernetes Service External IP Pending
Learn how to troubleshoot and resolve the issue of a Kubernetes service's external IP being stuck in the Pending state. Understand the causes and solutions for this common problem.
Where Does the Convention of Using /healthz for Application Health Checks Come From?
Discover the origins of the /healthz endpoint convention for application health checks and why it has become a standard in modern software development.
How Do I Get Logs from All Pods of a Kubernetes Replication Controller?
Learn how to retrieve logs from all Pods managed by a Kubernetes replication controller. Understand the commands and best practices for effective logging.
Should I commit .tfstate files to Git?
Understand why committing .tfstate files to Git is not recommended and explore best practices for managing Terraform state.
Specifying an API Gateway Endpoint with a Variable in Terraform
Learn how to dynamically specify an API Gateway endpoint with a variable in Terraform for flexible configurations.
Conditional Attributes in Terraform
Learn how to use conditional expressions to dynamically set resource attributes in Terraform.
Managing Different Environments in Terraform
Learn how to manage different environments in Terraform using workspaces, variable files, and directory structures.
Should .terraform.lock.hcl Be in .gitignore? (The Answer Might Surprise You)
The .terraform.lock.hcl file causes confusion for many Terraform users. Learn why you should commit it to version control and how to handle it properly.
Conditional Resource Creation in Terraform Based on .tfvars Variables
Learn how to conditionally create Terraform resources using variables from .tfvars files. Learn count, for_each, and dynamic blocks for flexible infrastructure.
terraform.tfvars vs variables.tf: What is the Difference?
Understand the difference between terraform.tfvars and variables.tf in Terraform and how to use them effectively.
Use Terraform to set up a Lambda function triggered by a scheduled event source
Learn how to use Terraform to create an AWS Lambda function triggered by a scheduled event source, such as a cron job.
How to Fix "Error acquiring the state lock: ConditionalCheckFailedException"
Learn how to diagnose and fix Terraform state lock errors that prevent your infrastructure deployments from running.
How to Load Input Data from a File in Terraform
Learn how to load input data from a file in Terraform using the `file` function and external data sources.
Correct way to attach AWS managed policies to a role?
Learn how to correctly attach AWS managed policies to an IAM role using the AWS Management Console, CLI, or Terraform.
How to Handle Persistent Storage for Databases in Docker
Learn how to properly manage database data in Docker containers using volumes, bind mounts, and best practices for data persistence across container restarts and deployments.
Docker Compose vs Kubernetes: Understanding the Key Differences
Explore the fundamental differences between Docker Compose and Kubernetes, including use cases, complexity levels, and when to choose each container orchestration tool.
Ingress vs Load Balancer in Kubernetes: When to Use Each
Learn the key differences between Kubernetes Ingress and LoadBalancer services, including use cases, cost implications, and implementation examples for optimal traffic routing.
How to Use Local Docker Images with Minikube
Learn different methods to use locally built Docker images in Minikube, including docker-env, image loading, and registry configuration for efficient Kubernetes development.
How to Create Symbolic Links in Linux
Learn how to create and manage symbolic links (symlinks) in Linux to create shortcuts, organize files, and maintain flexible file system structures.
How to Upgrade a Docker Container After Its Image Changed
Learn how to upgrade a Docker container to use a new version of its image without downtime.
How to Fix Pods Stuck in Terminating Status in Kubernetes
Learn how to diagnose and resolve Kubernetes pods that are stuck in Terminating status using kubectl commands, finalizers, and force deletion techniques.
How to Kill a Process Running on a Particular Port in Linux
Learn multiple methods to identify and terminate processes that are using specific ports on Linux systems using netstat, lsof, fuser, and ss commands.
How to Prompt for Yes/No/Cancel Input in Linux Shell Scripts
Learn how to create interactive shell scripts that prompt users for confirmation with Yes/No/Cancel options using various techniques and best practices.
Difference Between ClusterIP, NodePort and LoadBalancer Service Types in Kubernetes
Understand the key differences between ClusterIP, NodePort, and LoadBalancer service types in Kubernetes, when to use each, and how they expose applications.
How to Check Which Process is Using a Specific Port from Command Line
Learn how to identify which processes are listening on specific ports using netstat, lsof, and ss commands across different operating systems.
Delete All Local Docker Images Safely
Learn how to reclaim disk space by removing Docker images, containers, and volumes without breaking your development workflow.
Docker Compose: Understanding Ports vs Expose
Learn the key differences between ports and expose in Docker Compose, when to use each one, and how they affect container networking and security in your applications.
Terraform: Error Creating IAM Role. MalformedPolicyDocument: Has Prohibited Field Resource
Learn how to resolve the 'MalformedPolicyDocument: Has prohibited field Resource' error when creating an IAM role in Terraform.
How to Find Files Containing Specific Text on Linux
Need to locate files with specific content? Learn how to use grep, find, and other Linux tools to search through files and directories efficiently.
How to Reset Local Git Branch to Match Remote Repository HEAD
Learn different methods to reset your local Git branch to exactly match the remote repository HEAD, including hard reset, fetch and reset, and when to use each approach safely.
How Can I Use Local Docker Images with Minikube?
Learn how to use local Docker images with Minikube for Kubernetes development and testing.
How to Reset or Revert a File to a Specific Revision in Git
Learn multiple ways to reset or revert a specific file to a previous version in Git, including using git checkout, git restore, and git show commands with practical examples.
How to Push a New Local Branch to Remote Git Repository and Track It
Learn how to push a new local Git branch to a remote repository and set up tracking, including different methods for initial push, setting upstream branches, and managing branch relationships.
kubectl apply vs kubectl create: Understanding the Key Differences
Learn the differences between kubectl apply and kubectl create commands, when to use each, and how they handle resource management in Kubernetes deployments.
How to Create a Copy of a Directory in Unix/Linux
Learn various methods to copy directories in Linux and Unix systems using cp, rsync, and tar commands with practical examples and best practices.
How to Revert Git Repository to a Previous Commit Safely
Learn multiple safe methods to revert your Git repository to a previous commit, including using git revert, git reset, and git checkout with practical examples and safety considerations.
How to Loop Through File Content in Bash
Learn different methods to iterate through file content line by line in Bash scripts, including handling special characters and processing large files efficiently.
How to Change File and Folder Permissions Recursively in Linux
Learn how to use chmod command to change permissions for directories and all their subdirectories and files efficiently and safely.
Communication Between Multiple Docker-Compose Projects
Learn how to enable communication between multiple Docker-Compose projects using shared networks and environment configurations.
How to Execute Multiple Commands in Docker Compose
Learn different techniques for running multiple commands in Docker Compose services, from simple command chaining to advanced multi-stage initialization scripts.
How to Undo the Most Recent Local Commits in Git
Learn different ways to undo recent Git commits using reset, revert, and rebase commands. Understand when to use each method safely.
How to Ignore Change of an Attribute in Terraform Blocks
Learn how to use the `lifecycle` block with the `ignore_changes` argument to ignore changes to specific attributes in Terraform.
How to Change Echo Text Colors in Linux Terminal
Learn how to colorize your terminal output using ANSI escape codes with the echo command to make scripts more readable and visually appealing.
How to Count Number of Lines in Files Using Linux Terminal
Learn different methods to count lines in text files like CSV, TXT, and other non-binary files using wc, awk, sed, and other Linux command-line tools.
How to Delete a Git Branch Locally and Remotely
Learn how to safely delete Git branches both on your local machine and remote repositories using different Git commands and safety checks.
How to Discard Unstaged Changes in Git
Learn different methods to discard unstaged changes in Git using checkout, restore, and clean commands. Learn selective and bulk change removal techniques.
Move the Most Recent Commit(s) to a New Branch with Git
Learn how to move recent commits from your current branch to a new branch using git checkout, reset, and cherry-pick. Fix branch organization mistakes effectively.
How to Close Specific Ports on Linux Systems
Learn how to close and block specific ports on Linux using iptables, ufw, firewalld, and by stopping services. Secure your system by controlling port access.
What is the Difference Between Git Pull and Git Fetch?
Understand when to use git pull versus git fetch, how they affect your local repository, and which command is safer for different workflows.
How to Fix Docker "The input device is not a TTY" Error
Learn what causes the Docker TTY error and discover multiple solutions to fix it, from command-line flags to proper terminal configuration for interactive containers.
How to Use Grep to Show Only Filenames on Linux
Learn how to use grep options to display only the names of files containing matches, making it easier to identify relevant files in large searches.
How to Change the URI (URL) for a Remote Git Repository
Learn how to update remote repository URLs in Git when repositories are moved, renamed, or migrated. Learn remote management commands for seamless workflow continuation.
How to Rebuild a Docker Container in docker-compose.yml?
Learn how to rebuild Docker containers defined in a docker-compose.yml file, including tips for managing changes and dependencies.
How to Modify Existing, Unpushed Commit Messages
Learn how to change commit messages for unpushed commits using git commit --amend and interactive rebase. Learn message editing techniques for clean Git history.
How to Exclude Directories When Using Find in Linux
Learn how to exclude specific directories from find command searches to improve performance and focus on relevant results when searching through file systems.
How to Resolve Git Merge Conflicts
Learn how to identify, understand, and resolve Git merge conflicts effectively. Learn conflict resolution strategies, tools, and prevention techniques for smooth collaboration.
How to Loop Through an Array of Strings in Bash
Learn various methods to iterate through string arrays in Bash, including indexed arrays, associative arrays, and advanced looping techniques with practical examples.
How to Cherry Pick Commits in Git
Learn how to selectively apply specific commits from one branch to another using git cherry-pick. Learn single and multiple commit cherry-picking with conflict resolution strategies.
How to Rename a Local Git Branch
Learn how to rename Git branches locally using git branch -m, handle the current branch, and update remote tracking references safely.
How to Pipe to and from Clipboard in Bash Scripts
Learn how to integrate clipboard functionality into your Bash scripts using xclip, xsel, pbcopy, and pbpaste for seamless data transfer between terminal and GUI applications.
What is the Difference Between a Pod and a Deployment?
Understanding the difference between Pods and Deployments in Kubernetes is crucial for managing containerized applications effectively. Learn how they work and when to use each.
What is the Difference Between "Expose" and "Publish" in Docker?
Understanding the difference between 'expose' and 'publish' in Docker is crucial for managing container networking effectively. Learn how these concepts work and when to use them.
How to Reset Git to a Previous Commit
Learn different ways to reset your Git repository to a previous commit state. Understand the differences between soft, mixed, and hard resets and when to use each approach.
How to Split a Terraform File (main.tf) into Several Files (No Modules)
Organizing Terraform configurations by splitting a single main.tf file into multiple files can improve readability and maintainability. Learn how to do this without using modules.
How to Enter a Docker Container Already Running with a New TTY
Learn how to attach to a running Docker container with a new TTY session for debugging or interaction.
How to Stash Changes in Git
Learn how to temporarily save your work in progress using Git stash. Learn stashing, applying, and managing multiple stashes to handle interruptions in your development workflow.
How to Recursively Grep All Directories and Subdirectories
Learn how to use grep with recursive options to search through entire directory trees efficiently, including advanced filtering and performance optimization techniques.
How to View Git Commit History
Learn various ways to explore and analyze your Git commit history. Learn git log options, filtering techniques, and formatting to understand your project evolution and track changes effectively.
Defining Variables with and without Export in Linux Shell
Understand the difference between regular shell variables and exported environment variables, when to use export, and how variable scope affects scripts and processes.
How to Find Files Using Wildcards in Linux
Learn how to use wildcard patterns with find command to recursively search for files in directories and subdirectories based on name patterns.
How to Undo Git Add Before Commit
Learn how to unstage files that you've added to Git's staging area using git reset, git restore, and other methods before committing.
Difference Between RUN and CMD in a Dockerfile
Understand the key differences between RUN and CMD in a Dockerfile, and learn when to use each for building and running Docker containers.
How to Force Git Pull to Overwrite Local Files
Learn how to use git reset, git clean, and git checkout to force git pull to overwrite local changes when you need to match the remote repository exactly.
How to Profile C++ Code Performance on Linux
Learn how to use profiling tools like gprof, Valgrind, and perf to analyze C++ application performance and identify bottlenecks on Linux systems.
How to Delete Exported Environment Variables in Linux
Learn different methods to remove environment variables from your current shell session and prevent them from persisting in future sessions.
How to Check Out a Remote Git Branch
Learn different methods to check out remote Git branches locally using git checkout, git switch, and git fetch commands with practical examples.
How We Reduced Our AWS Bill by 73% While Actually Improving Performance
The counterintuitive strategies we used to slash cloud costs while actually improving application performance.
How to Access Host Port from Docker Container
Learn how to access a host machine's port from a Docker container using network configurations and best practices.
Where Docker Images Are Stored on Your Host Machine
Discover where Docker stores images, containers, and volumes on different operating systems, and learn how to manage Docker's storage footprint effectively.
Docker Complains About "No Space Left on Device": How to Clean Up?
Running out of space while using Docker can disrupt your workflow. Learn how to identify and clean up unused Docker resources to free up space.
How to Execute Terraform Actions Without the Interactive Prompt
Learn how to automate Terraform workflows by bypassing the interactive prompt for commands like apply and destroy.
How to Make Git Forget About a File That Was Tracked But Is Now in .gitignore
Learn how to remove files from Git tracking while keeping them locally when you add them to .gitignore after they were already committed.
The GitHub Actions Workflow That Eliminated Our DevOps Bottleneck
How we reduced deployment time from 2 hours to 8 minutes using smart GitHub Actions patterns and parallel execution strategies.
How to Remove Local Untracked Files from Git Working Tree
Learn how to use git clean to remove untracked files and directories from your Git working tree safely with different options and safety checks.
How to Check if a Variable is Set in Bash
Learn multiple methods to check if variables are set, unset, empty, or have specific values in Bash scripts with practical examples and best practices.
How to Fix Docker: Permission Denied
Getting a 'permission denied' error when using Docker can be frustrating. Here's how to fix it depending on the OS, Docker command, and user setup.
How do you do simple string concatenation in Terraform?
Learn how to perform string concatenation in Terraform using interpolation and the join function.
How to for_each through a list(objects) in Terraform
Learn how to use the for_each construct in Terraform to iterate through lists of objects and dynamically create resources.
Why Running Postgres on Kubernetes Is Still a Bad Idea (And What to Do Instead)
Everyone wants to run databases on Kubernetes, but should you? We explore the real challenges of stateful workloads and better alternatives.
How to Push a Docker Image to a Private Repository
Learn how to push a Docker image to a private repository, including authentication and best practices for secure image management.
AWS ASG Launch Templates vs Launch Configurations
Understand the key differences between AWS Auto Scaling Group Launch Templates and Launch Configurations to make informed decisions for your infrastructure.
How Can I Expose More Than One Port with Docker?
Learn how to expose multiple ports in Docker to enable complex containerized applications with multiple services.
How to List All Pods and Their Nodes in Kubernetes
Learn how to list all pods in your Kubernetes cluster along with the nodes they're running on, using kubectl and command-line tools for clear, actionable output.
How to Remove Old Docker Containers
Over time, stopped Docker containers pile up and take up space. Learn how to list, filter, and clean up unused containers safely and efficiently.
How to Attach Multiple IAM Policies to IAM Roles Using Terraform
Learn how to attach multiple IAM policies to a single IAM role in Terraform to manage permissions effectively.
How to Check if a String Contains a Substring in Bash
Learn multiple methods to check for substring presence in Bash, including pattern matching, case-insensitive searches, and practical examples for string validation.
Docker: Name is Already in Use by Container
Encountering the 'name is already in use by container' error in Docker? Learn why it happens and how to resolve it effectively.
Fixing the "Invalid Legacy Provider Address" Error in Terraform
Learn how to resolve the 'Invalid legacy provider address' error in Terraform by upgrading your provider configurations.
How Do I Pass Environment Variables to Docker Containers?
Environment variables are a clean way to configure your Docker containers without hardcoding values. This guide shows different methods and when to use each.
Variables Within Variables in Terraform
Learn how to use variables within variables in Terraform to create dynamic and reusable configurations.
How to Nuke All AWS Resources in an AWS Account
Learn how to safely and efficiently delete all resources in an AWS account using tools like AWS CLI and Terraform.
How to Display Sensitive Data Output Variables in Terraform
Learn how to handle and display sensitive data output variables in Terraform safely and effectively.
How to Force Docker for a Clean Build of an Image
Docker caches layers to speed up builds, but sometimes you want a completely fresh image build. Here's how to force Docker to skip the cache and build from scratch.
Determining Minimum AWS Permissions for Terraform Configurations
Learn how to identify the minimum AWS permissions required for your Terraform configurations to enhance security and compliance.
How to Concatenate String Variables in Bash
Learn multiple ways to combine string variables in Bash scripts, from simple concatenation to complex string operations with practical examples.
Docker Image vs Container: Key Differences
Learn the fundamental difference between Docker images and containers through practical examples and real-world scenarios.
Terraform + DynamoDB: All Attributes Must Be Indexed
Learn how to handle the 'all attributes must be indexed' requirement in DynamoDB when using Terraform.
Should I Use Vagrant or Docker for Creating an Isolated Environment?
Choosing between Vagrant and Docker depends on your workflow and what kind of isolation you need. This guide walks through real-world use cases to help you decide.
How to Update a Kubernetes Secret Generated from a File
Learn how to update an existing Kubernetes secret when its data comes from a file, with practical kubectl commands and tips for safe secret management.
Who is Listening on a Given TCP Port on Mac OS X?
Need to find out which process is using a specific port on your Mac? Here's how to check which application is listening on a TCP port using built-in macOS tools.
How to Get a Docker Container's IP Address from the Host
Learn how to find a Docker container's internal IP address from your host machine using simple Docker commands. This is useful for debugging, testing services, or container communication.
In a Dockerfile, How to Update the PATH Environment Variable?
Learn how to modify the PATH environment variable in a Dockerfile to include custom directories for executables.
How to Set a Variable to the Output of a Command in Bash
Learn multiple methods to capture command output in Bash variables using command substitution, including best practices and error handling techniques.
How to Clean Up ReplicaSets When Updating Kubernetes Deployments
Learn how and when to clean up old ReplicaSets after updating Kubernetes Deployments, why they accumulate, and how to manage rollout history for a tidy cluster.
Docker Security Best Practices
Secure your Docker environment from development to production with practical techniques for image hardening, runtime protection, and vulnerability management.
Finding Local IP Addresses Using Python's stdlib
Learn how to find the local IP address of your machine using only Python's standard library. No third-party packages required.
How to Fix Echo Newline in Bash When It Prints Literal \n
Learn why echo sometimes prints literal \n instead of newlines and discover multiple solutions to properly output newline characters in Bash scripts.
Docker - Ubuntu - bash: ping: command not found [closed]
Resolve the 'ping: command not found' error in Ubuntu-based Docker containers by installing missing packages.
How to Parse Command Line Arguments in Bash
Learn various methods to parse command line arguments in Bash scripts, including positional parameters, getopts, and advanced argument handling techniques.
How to Get Your Local IP Address
Learn multiple methods to find your local IP address using command line tools, programming languages, and system utilities across different operating systems.
kubectl logs - Continuously
Learn how to use kubectl to stream logs continuously from Kubernetes Pods for real-time monitoring.
Exploring a Docker Container's File System
Debug application issues by navigating container file systems, examining logs, and understanding how Docker layers affect your running containers.
What Is FinOps? A Beginner's Guide to Cloud Cost Management
Discover how FinOps transforms chaotic cloud spending into strategic financial operations, bringing teams together to optimize costs while maintaining innovation speed.
Kubernetes: How to Make Deployment to Update Image
Learn how to update the container image in a Kubernetes Deployment using kubectl commands.
Fixing "A Reference to Resource Type Must Be Followed by At Least One Attribute Access" in Terraform
Learn how to resolve the error 'A reference to resource type must be followed by at least one attribute access' in Terraform.
How to Change the Output Color of Echo in Linux
Learn how to add colors to your echo output in Linux and Bash scripts using ANSI escape codes, tput commands, and color variables for better terminal display.
How to Sign In to the Kubernetes Dashboard
Learn how to securely access and sign in to the Kubernetes Dashboard, including token generation, best practices, and troubleshooting common login issues.
How to Find Which Process Is Listening on a Port in Windows
Need to know which application is using a specific TCP or UDP port on Windows? Here's how to check using netstat, tasklist, PowerShell, and Resource Monitor.
What Is the Quickest Way to HTTP GET in Python?
Need to make a quick HTTP GET request in Python? Here's how to do it with standard libraries and third-party tools, including pros and tradeoffs.
How to Create a Folder in an AWS S3 Bucket Using Terraform
Learn how to create a folder in an AWS S3 bucket using Terraform by leveraging the `aws_s3_object` resource.
Service Located in Another Namespace
Learn how to access and interact with Kubernetes Services located in different namespaces.
What is the Runtime Performance Cost of a Docker Container?
Understand the runtime performance impact of Docker containers compared to virtual machines and bare-metal systems.
How to Cleanly List All Containers in a Kubernetes Pod
Learn several ways to list all containers in a Kubernetes pod using kubectl and JSONPath, with practical examples for real-world troubleshooting and automation.
Listing All Resources in a Namespace
Learn how to list all resources in a Kubernetes namespace using kubectl commands.
How to Artificially Create a Connection Timeout Error
Learn practical methods to simulate connection timeouts for testing error handling, resilience patterns, and timeout configurations in your applications.
How to Remove Old and Unused Docker Images
Reclaim disk space efficiently by identifying and removing outdated Docker images while preserving the ones you need for active development and production.
Redirecting Output to Both a File and stdout in Bash
Learn how to capture command output in a file while still seeing it live in your terminal
Using a Git Branch as a Source for Terraform Modules
Learn how to use a specific Git branch as the source for Terraform modules to manage versioning and development workflows.
Getting an Environment Variable in Terraform Configuration
Learn how to retrieve and use environment variables in Terraform configurations using the `env` function and input variables.
How to Assign a Port Mapping to an Existing Docker Container
Learn how to assign a port mapping to an already running Docker container using practical workarounds and best practices.
How to Switch kubectl Clusters Between gcloud and minikube
Learn how to seamlessly switch between gcloud and minikube clusters using kubectl commands.
The provided execution role does not have permissions to call DescribeNetworkInterfaces on EC2
Learn how to resolve the 'execution role does not have permissions to call DescribeNetworkInterfaces' error in AWS EC2.
Checking Kubernetes Pod CPU and Memory Utilization
Learn how to monitor CPU and memory usage of Kubernetes Pods using kubectl and metrics-server.
How Can I Keep a Container Running on Kubernetes?
Learn how to ensure your container stays running on Kubernetes by using proper configurations and best practices.
How to Check if a File Does Not Exist in Bash
Learn various methods to test for file non-existence in Bash scripts, including proper error handling, permission checks, and practical automation examples.
How to Extract Filename and Extension in Bash
Learn multiple methods to extract filenames, extensions, and directory paths from file paths in Bash using parameter expansion and basename commands.
At Least One Invalid Signature Was Encountered
Understand the causes of invalid signatures in Kubernetes and learn how to troubleshoot and resolve them.
How to Delete All Resources from Kubernetes at One Time
Learn how to delete all resources in a Kubernetes namespace or cluster using kubectl commands.
Is there an AND/OR Conditional Operator in Terraform?
Learn how to use AND/OR conditional operators in Terraform to create dynamic configurations.
Why Does a Kubernetes Pod Get Recreated When Deleted?
Learn why Kubernetes automatically recreates Pods when they are deleted, and understand the mechanisms behind this behavior.
Refactoring modules: Error: Provider configuration not present
Learn how to resolve the 'Provider configuration not present' error when refactoring Terraform modules.
How can I remove a resource from Terraform state?
Learn how to safely remove a resource from Terraform state without affecting the actual infrastructure.
How are data sources used in Terraform?
Understand how to use data sources in Terraform to fetch information about existing resources.
How Does kubectl port-forward Create a Connection?
Understand how kubectl port-forward works to create connections between your local machine and Kubernetes Pods.
Kubernetes API - Get Pods on Specific Nodes
Learn how to use the Kubernetes API to retrieve Pods running on specific nodes in your cluster.
Upgrade Terraform to Specific Version
Learn how to upgrade Terraform to a specific version on your system, ensuring compatibility with your infrastructure.
How to Split a String on a Delimiter in Bash
Learn multiple methods to split strings using delimiters in Bash, including IFS, parameter expansion, and array techniques with practical examples.
Initial setup of Terraform backend using Terraform
Learn how to configure a Terraform backend for secure and efficient state management.
How to Run a Docker Image as a Container
Learn how to start a container from a Docker image, pass environment variables, map ports, and manage container lifecycle.
Real-World Kubernetes Deployments
Lessons learned from deploying Kubernetes in production environments.
Terraform Infrastructure as Code Best Practices
How to write scalable and maintainable Terraform code for your cloud infrastructure.
Get YAML for Deployed Kubernetes Services
Learn how to retrieve the YAML configuration for deployed Kubernetes Services using kubectl commands.
How to Mount a Host Directory in a Docker Container
Learn how to mount a local directory into a Docker container for development, data sharing, or configuration. This guide covers syntax, permissions, and real-world use cases.
What Is the Difference Between a Port and a Socket?
Ports and sockets are often mentioned together in networking, but they serve different roles. This guide breaks down what they are and how they work together.
How to Check if a Directory Exists in Bash Shell Scripts
Learn multiple methods to check directory existence in Bash scripts, including proper error handling, permission checks, and practical use cases for reliable automation.
How Can I Debug "ImagePullBackOff"?
Learn how to troubleshoot and resolve the ImagePullBackOff error in Kubernetes Pods.
How to Copy Files from Kubernetes Pods to Local System
Learn how to use kubectl commands to copy files from Kubernetes Pods to your local system.
I would like to run Terraform only for a specific resource
Learn how to target specific resources in Terraform to save time and avoid unnecessary changes.
Restart Pods When ConfigMap Updates in Kubernetes
Learn how to restart Kubernetes Pods automatically when a ConfigMap is updated.
How to Migrate Terraform State Between Projects
Learn how to safely migrate Terraform state between projects using the `terraform state` command.
How to Redirect and Append Both stdout and stderr to a File in Bash
Learn different methods to capture both standard output and error streams in Bash, including appending to files and separating streams for better logging.
How to Check if a Program Exists from a Bash Script
Learn multiple reliable methods to check if a command or program is available on your system from within Bash scripts, including using which, command, and type.
Docker Push Error: denied: requested access to the resource is denied
Troubleshoot and resolve the common Docker push error about denied access to a resource. Learn about authentication, repository naming, and permissions.
Difference Between targetPort and port in Kubernetes Service Definition
Understand the distinction between targetPort and port in Kubernetes Service definitions, and learn how they impact your application's networking.
Terraform - Delete All Resources Except One
Learn how to delete all resources managed by Terraform except for a specific resource by using targeted commands and state manipulation.
How to Write an if, else, elsif Conditional Statement in Terraform
Learn how to use if, else, and elsif conditional statements in Terraform to create dynamic configurations.
How to Edit a File After You Shell to a Docker Container
Learn how to edit files inside a running Docker container using shell access, text editors, and best practices for persistent changes.
What Does "2>&1" Mean in Linux and Bash?
Learn what the 2>&1 redirection operator means in Linux commands, how it works with standard output and error streams, and when to use it effectively.
How to Count Lines of Code in a Directory Recursively
Discover multiple methods to count source code lines across entire directory trees, including filtering by file types and excluding specific directories.
Cannot Connect to the Docker Daemon at unix:/var/run/docker.sock. Is the Docker Daemon Running?
Troubleshoot the common Docker error about not being able to connect to the Docker daemon. Learn why it happens and how to fix it on Linux and macOS.
Terraform Failing with Invalid for_each Argument / The Given "for_each" Argument Value is Unsuitable
Learn how to troubleshoot and fix the "Invalid for_each argument" error in Terraform.
Can Terraform Be Used to Provision On-Premises Servers?
Learn how Terraform can be used to provision on-premises servers by integrating with tools like VMware vSphere, Ansible, and bare-metal providers.
How to Get the Directory Where a Bash Script is Located
Learn multiple reliable methods to determine the directory path of your Bash script from within the script itself, including handling symbolic links and edge cases.
How to Get Events Only for a Pod with kubectl
Learn how to filter and view Kubernetes events for a specific pod using kubectl, with practical examples for troubleshooting and automation.
Docker: How to Change Repository Name or Rename an Image
Learn how to rename a Docker image or change its repository name using simple Docker CLI commands. This guide covers real-world scenarios and best practices.
How to Set Multiple Commands in One YAML File with Kubernetes
Learn how to define and run multiple commands in a Kubernetes Pod using a single YAML manifest. This guide covers best practices and real-world examples for multi-step container initialization.
How to Iterate Over a Range of Numbers in Bash Using Variables
Learn different methods to loop through number ranges defined by variables in Bash, from simple for loops to advanced sequence generation techniques.
How to Remove a Docker Image
Learn how to safely remove Docker images, clean up unused layers, and avoid common pitfalls when managing local images.
Concatenate a String with a Variable in Terraform
Learn how to concatenate strings with variables in Terraform to create dynamic configurations.
How to See Docker Image Contents
Explore the contents of a Docker image using practical commands. Learn how to inspect layers, browse files, and debug images locally.
How to Decode a Kubernetes Secret
Kubernetes secrets store sensitive data in base64-encoded form. Learn how to safely decode and inspect these secrets using kubectl and command-line tools.
Modules + Output from for_each
Learn how to use for_each with modules in Terraform to dynamically create resources and manage outputs.
How to Reload .bashrc Settings Without Logging Out
Need to apply changes to your .bashrc file immediately? Learn multiple methods to reload your Bash configuration without restarting your terminal session.
How to Include Files Outside of Docker's Build Context
Learn why Docker restricts file access during builds, and how to work around this limitation to include files outside the build context.
How to List Containers in Docker
Learn how to list running and stopped Docker containers, filter by status, and get useful details for troubleshooting and management.
Terraform Statefile is Locked: How to Unlock It
Learn how to unlock a locked Terraform statefile using the `force-unlock` command and best practices to avoid future locks.
Looping Through File Content Line by Line in Bash
Learn multiple techniques to read and process file content line by line in Bash scripts, including handling special characters and preserving whitespace.
How to Manage Multiple Environments in Kubernetes (Staging, QA, Production)
Learn practical strategies for managing multiple Kubernetes environments like staging, QA, and production. This guide covers namespace organization, configuration management, and deployment workflows.
How to Restart a Container Within a Kubernetes Pod
Learn practical ways to restart a container inside a Kubernetes pod, including when and why you might need to do this, and the best approaches for different scenarios.
Kubernetes Pods Keep Crashing with CrashLoopBackOff but No Logs Found
Troubleshoot Kubernetes pods stuck in CrashLoopBackOff with no logs. Learn why this happens and how to diagnose and resolve the issue.
Kubernetes Deployments vs StatefulSets
Understand the differences between Kubernetes Deployments and StatefulSets, when to use each, and how they impact your application's behavior and scaling.