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Terraform keeps recreating resources even when nothing has changed—why?
Terraform does this when the real infrastructure doesn’t match the configuration exactly, even if the difference seems harmless. Small drifts—like default values set by the provider, manual console changes, or computed fields—can cause Terraform to think a resource needs replacement. This often happRead more
Terraform does this when the real infrastructure doesn’t match the configuration exactly, even if the difference seems harmless.
Small drifts—like default values set by the provider, manual console changes, or computed fields—can cause Terraform to think a resource needs replacement. This often happens after importing existing resources or tweaking things manually outside Terraform.
The plan output usually tells you which attribute is triggering the change, but it’s easy to overlook.
Takeaway: Terraform is strict by design; even small mismatches can cause replacement.
See lessWhy does kubectl apply succeed but my changes don’t show up in the pod?
Some Kubernetes resources don’t automatically trigger restarts. ConfigMaps and Secrets can update successfully without affecting running pods unless you explicitly restart them or design the application to reload configuration dynamically. This often makes it feel like changes were ignored when theyRead more
Some Kubernetes resources don’t automatically trigger restarts.
ConfigMaps and Secrets can update successfully without affecting running pods unless you explicitly restart them or design the application to reload configuration dynamically. This often makes it feel like changes were ignored when they weren’t.
Takeaway: Successful applies don’t always mean live changes.
See lessWhy does my Docker image work on my machine but fail on Alpine Linux?
Alpine uses a different C library, which breaks many precompiled binaries. If your application relies on native extensions or copied binaries, they may not be compatible with Alpine’s environment. This is especially common with Python and Node dependencies. Switching base images or compiling dependeRead more
Alpine uses a different C library, which breaks many precompiled binaries.
If your application relies on native extensions or copied binaries, they may not be compatible with Alpine’s environment. This is especially common with Python and Node dependencies.
Switching base images or compiling dependencies inside Alpine usually resolves it.
Takeaway: Base image choice affects binary compatibility more than people expect.
See lessWhy does my Terraform plan differ between machines?
Different Terraform or provider versions produce different plans. Without version locking, small changes in provider behavior cause unexpected diffs. This is especially noticeable across developer machines and CI. Takeaway: Determinism starts with strict version control.
Different Terraform or provider versions produce different plans.
Without version locking, small changes in provider behavior cause unexpected diffs. This is especially noticeable across developer machines and CI.
Takeaway: Determinism starts with strict version control.
See lessWhy does my Docker build fail with “no space left on device” even though the host has free disk space?
Docker manages its own storage area, and that space can fill up even if the host filesystem still has room. Old images, stopped containers, and unused build cache accumulate quietly over time, especially on CI machines. When Docker’s storage directory fills up, builds fail even though df -h looks fiRead more
Docker manages its own storage area, and that space can fill up even if the host filesystem still has room.
Old images, stopped containers, and unused build cache accumulate quietly over time, especially on CI machines. When Docker’s storage directory fills up, builds fail even though
df -hlooks fine at first glance.This catches people off guard because the error doesn’t point to Docker storage directly.
Takeaway: Docker disk usage needs its own cleanup and monitoring, separate from the host.
See lessWhy does my Terraform apply succeed but resources don’t actually exist?
Terraform probably applied the resources somewhere other than where you’re looking. This happens when credentials point to a different account, subscription, or region than expected. Terraform doesn’t warn you if you’re authenticated correctly but targeting the wrong environment—it just applies succRead more
Terraform probably applied the resources somewhere other than where you’re looking.
This happens when credentials point to a different account, subscription, or region than expected. Terraform doesn’t warn you if you’re authenticated correctly but targeting the wrong environment—it just applies successfully.
This is especially common in CI setups where multiple cloud credentials exist side by side.
Takeaway: Always verify account and region before assuming Terraform didn’t work.
See lessWhy does my Azure VM fail to access storage even though the managed identity has permissions?
A managed identity must be reachable and correctly scoped before it can be used. If the VM can’t obtain tokens, the issue is often networking, disabled identity endpoints, or role assignments applied at the wrong scope. Even when everything is correct, permission changes can take a few minutes to prRead more
A managed identity must be reachable and correctly scoped before it can be used.
If the VM can’t obtain tokens, the issue is often networking, disabled identity endpoints, or role assignments applied at the wrong scope. Even when everything is correct, permission changes can take a few minutes to propagate.
People often assume identity assignment is instant and global, which leads to confusion during testing.
Takeaway: Managed identities depend on both token access and correct scope.
See lessWhy does my Kubernetes pod stay in CrashLoopBackOff with no obvious error logs?
This happens when the container exits too quickly for logs to be captured, usually because it fails during startup. If a container crashes immediately due to a bad command, missing file, or failed initialization, Kubernetes restarts it repeatedly. The useful error often appears only in the previousRead more
This happens when the container exits too quickly for logs to be captured, usually because it fails during startup.
If a container crashes immediately due to a bad command, missing file, or failed initialization, Kubernetes restarts it repeatedly. The useful error often appears only in the previous container run, not the current one. Pod events are also important here, because probes or exit codes often explain what’s happening long before logs do.
Many people focus only on live logs and miss the fact that Kubernetes keeps a short history of failed runs.
Takeaway: When logs look empty, pod events and previous container logs usually explain the crash.
See lessWhy does my autoscaling group terminate healthy instances?
Autoscaling is focused on meeting capacity targets, not preserving individual instances. If scale-in policies are aggressive and instance protection isn’t enabled, the autoscaler will happily terminate healthy instances to reduce capacity. From its perspective, everything is working as designed. ProRead more
Autoscaling is focused on meeting capacity targets, not preserving individual instances.
If scale-in policies are aggressive and instance protection isn’t enabled, the autoscaler will happily terminate healthy instances to reduce capacity. From its perspective, everything is working as designed.
Problems arise when workloads aren’t prepared for termination or don’t drain gracefully before shutdown.
Takeaway: Autoscaling protects numbers, not workloads, unless you configure it to.
See lessWhy does my Docker container fail with “permission denied” when writing files?
This happens because the container is running as a non-root user and doesn’t have permission to write to the directory it’s trying to use. Many modern images intentionally drop root privileges for security reasons. That’s good practice, but it means directories owned by root are no longer writable uRead more
This happens because the container is running as a non-root user and doesn’t have permission to write to the directory it’s trying to use.
Many modern images intentionally drop root privileges for security reasons. That’s good practice, but it means directories owned by root are no longer writable unless you explicitly change ownership or permissions. This often shows up when mounting volumes or writing logs at runtime.
It’s especially confusing because everything may work fine locally if you were previously running the container as root.
Takeaway: Non-root containers are safer, but you must explicitly manage file ownership.
See less