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  • Terraform State File Explained: terraform.tfstate, Remote State on S3, Locking, Pull and Push

    calendar Dec 30, 2021 · 19 min read  ·
    Last Modified : Oct 9, 2026
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    Terraform State File Explained: terraform.tfstate, Remote State on S3, Locking, Pull and Push

    Terraform has its backbone known as the terraform.tfstate file. Any change you make to your infrastructure will have its presence in the terraform.tfstate file. So when you work with Terraform for managing and provisioning your infrastructure, Terraform will always create a terraform.tfstate file for you. I have been …


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  • docker failed to compute cache key: failed to calculate checksum of ref - not found (the 6 causes, tested on Docker 28)

    calendar Dec 20, 2021 · 9 min read  ·
    Last Modified : Oct 17, 2026
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    docker failed to compute cache key: failed to calculate checksum of ref - not found (the 6 causes, tested on Docker 28)

    TL;DR "failed to compute cache key ... not found" is COPY telling you the source path is not in the build context. It happens before any layer is built, which is why --no-cache changes nothing. The context is the last argument of docker build, not the folder with the Dockerfile. cd docker && docker …


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  • Error response from daemon: failed to set up container networking: driver failed programming external connectivity on endpoint - Bind for 0.0.0.0:8080 failed: port is already allocated (Fix in One Minute)

    calendar Dec 9, 2021 · 11 min read  ·
    Last Modified : Oct 17, 2026
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    Error response from daemon: failed to set up container networking: driver failed programming external connectivity on endpoint - Bind for 0.0.0.0:8080 failed: port is already allocated (Fix in One Minute)

    TL;DR Meaning: the host port in your -p HOST:CONTAINER is already in use. Docker could not bind it, so the container was created but never started (docker ps -a shows it as Created). Two wordings, same cause. Bind for 0.0.0.0:8080 failed: port is already allocated means another container publishes that port. failed to …


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  • Delete Kubernetes POD stuck in terminating state?

    calendar Dec 8, 2021 · 8 min read  ·
    Last Modified : Dec 8, 2021
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    Delete Kubernetes POD stuck in terminating state?

    The deletion of the Kubernetes POD depends on many factors, before you execute the kubectl delete pod command you should go through the following checkpoint - Is the container associated with POD still running? Are there any active Kubernetes deployment associated with POD? Check if the POD persistent volume and …


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  • How to Delete PV(Persistent Volume) and PVC(Persistent Volume Claim) stuck in terminating state?

    calendar Dec 7, 2021 · 5 min read  ·
    Last Modified : Dec 7, 2021
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    How to Delete PV(Persistent Volume) and PVC(Persistent Volume Claim) stuck in terminating state?

    The deletion of PV(Persistent Volume) and PVC(Persistent Volume claim) is pretty much dependent on the Delete reclaim policy. When you are planning to delete the Persistent Volume as well as Persistent Volume Claim then you must follow an order - First delete - Persistent Volume Claim Second delete- Persistent Volume …


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  • Securing AWS secrets using HashiCorp Vault with Terraform?

    calendar Dec 5, 2021 · 12 min read  ·
    Last Modified : Oct 10, 2026
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    Securing AWS secrets using HashiCorp Vault with Terraform?

    For managing the cloud resources(EC2, S3 Bucket) on AWS you need to supply the AWS secrets(region, access_key, secret_key) inside the terraform file. You can use the plain text AWS Secrets inside your terraform file and it should work fine. But from the security standpoint, it is strongly discouraged to use plain text …


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  • exec - executable file not found in $PATH (or %PATH%) in Docker - every cause and fix, inside the container and on the host

    calendar Nov 25, 2021 · 13 min read  ·
    Last Modified : Oct 17, 2026
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    exec - executable file not found in $PATH (or %PATH%) in Docker - every cause and fix, inside the container and on the host

    TL;DR Read the line before the error. OCI runtime create failed ... exec: "bash" is inside the container: the image cannot find that program. error: exec: "docker", "docker-compose" or "docker-credential-desktop" is on your host: a tool cannot find a Docker binary. Inside the …


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  • download s3 bucket - How to Download an Entire S3 Bucket or Folder with aws s3 sync and aws s3 cp --recursive (Real Output), Plus MinIO mc, s3cmd and Cyberduck

    calendar Nov 20, 2021 · 12 min read  ·
    Last Modified : Oct 17, 2026
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    download s3 bucket - How to Download an Entire S3 Bucket or Folder with aws s3 sync and aws s3 cp --recursive (Real Output), Plus MinIO mc, s3cmd and Cyberduck

    TL;DR The command: aws s3 sync s3://<bucket>[/prefix] /local/dir. It downloads everything under the bucket or prefix, keeps the folder structure, and on the next run transfers only what changed - the second sync in my test printed nothing and exited 0. Measure first: aws s3 ls s3://<bucket>/<prefix> …


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  • Share kubernetes secrets between namespaces?

    calendar Nov 12, 2021 · 5 min read  ·
    Last Modified : Nov 12, 2021
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    Share kubernetes secrets between namespaces?

    Kubernetes secrets are API objects which can only be referenced by POD, so if you are working in multiple namespaces then you can not share the same kubernetes secrets. Although it is possible to copy the same kubernetes into the desired namespace. Create kubernetes namespace testns1 In this blog post we are going to …


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  • How to use Kubernetes secrets?

    calendar Nov 8, 2021 · 11 min read  ·
    Last Modified : Nov 8, 2021
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    How to use Kubernetes secrets?

    Before we jump onto kubernetes secrets let’s first try to understand What is Secret? - Secret is sensitive information which can not be written in a plain text or shared with others. The best example of Secrets would be the password. But Why do we need to use Kubernetes Secret? - Running a bare minimum kubernetes …


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Recent Posts

  • Kubernetes IP Address Planning: 22 Problems the Free IP Calculator Solves on EKS, GKE, AKS and On-Premises (kubeadm, Mirantis MKE, RKE2, OpenShift, Tanzu, Talos), with the Numbers and a Screenshot for Each
  • git rebase --exec Explained - Run Your Tests on Every Commit Before You Push, with Real Output, the Failure Path, and the Three Things That Bit Me
  • helm template Explained - Render a Helm Chart Locally Without a Cluster (Helm 4): Values Files, --set, --show-only, --output-dir, and the Traps That Bite
  • Should You Do a Cloud Certification? The Four Reasons I Tell People Not to Collect Them, What the Exams Cost in 2026, and the One Case Where a Certificate Is Worth the Money
  • Three AWS Solutions Architect Associate Questions From My Shorts, Answered Properly - Migrating Web, Batch and Legacy Apps; Cutting EC2 Cost for a 2-Week Shutdown Without Losing Memory; Internet for Private Subnets (with the Prerequisites the 30-Second Answers Skip)
  • What to Learn Before (and Alongside) Cloud - the Six Non-Cloud Skills Every DevOps, SRE and Cloud Engineer Uses Daily: Code and Git, Scripting, CI/CD, Automation, Infrastructure as Code, Networking and Security
  • Google Cloud External HTTP Load Balancer Step by Step - Forwarding Rule, Proxy, URL Map, Backend Service, Health Check and Instance Group in the Console and in Terraform, and Why the First curl Returned 502 (GCP Part 9)
  • Google Cloud IAM Explained - Principals, Roles and Permissions, Owner vs Editor vs Viewer (Now Legacy) vs the New Admin, Writer and Reader Roles, and What an Editor Can Really Do (GCP Part 4)

Rahul Wagh

Jhooq
Its all about Open Source and DevOps, here I talk about Kubernetes, Docker, Java, Spring boot and practices.
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