Author Archives: Allen Rodriguez
eBPF makes it possible to run verified programs at selected points in the Linux kernel and collect high-value runtime data without modifying every application. In cloud-native environments, that can expose network flows, system-call behavior, process execution, latency, and other kernel-level signals that are difficult to obtain from application instrumentation alone. The KCNA exam includes foundational […]
Container image signing adds cryptographic evidence to an artifact so a deployment system can verify who signed it and whether the referenced image matches the signed content. It addresses a supply-chain question that vulnerability scanning alone cannot answer: is this the artifact the trusted build or release process actually approved? Image signing is a specialized […]
Kubernetes admission control is the policy layer that evaluates API requests after authentication and authorization but before an accepted object is persisted. That position makes admission a powerful preventative boundary: the cluster can reject or mutate an unsafe workload definition before controllers schedule it. KCNA introduces Kubernetes security and API administration at a conceptual level; […]
Terraform Stacks introduce a higher-level way to organize repeated infrastructure across environments, regions, accounts, or other deployment dimensions. A Stack is not simply a large root module and it is not a renamed HCP Terraform workspace; it has its own component and deployment model. Terraform Associate 004 includes fundamental state, dependency, lifecycle, and HCP Terraform […]
Terraform state is an ownership database. It records which configuration manages which real objects and stores enough resource data for Terraform to plan future changes. When too much infrastructure shares one state, a routine change can acquire an unnecessarily large blast radius; when state is split without a clear architecture, dependencies become fragile and duplicated. […]
Terraform frequently handles values that deserve stronger protection than ordinary configuration: database passwords, API tokens, private keys, connection strings, and credentials returned by managed services. The critical distinction is that hiding a value in terminal output is not the same as preventing Terraform from storing it. The current HashiCorp Terraform Associate 004 exam includes the […]
Terraform drift is the gap between the infrastructure Terraform expects and the infrastructure that actually exists. It commonly appears after manual console changes, emergency fixes, automated systems that modify managed resources, provider-side defaults, or organizational processes that allow changes outside the Terraform workflow. The current HashiCorp Terraform Associate 004 exam gives candidates the state and […]
Terraform import is how an existing infrastructure object becomes bound to a Terraform resource address so the object can be managed through configuration and state. The operation sounds like a migration shortcut, but the difficult work is not the import command itself. The difficult work is creating configuration that accurately describes the existing object without […]
Terraform modules are one of the main mechanisms for turning infrastructure code into a reusable engineering system, but reuse alone does not make a module architecture scalable. A module can remove duplicated HCL while still creating tight coupling, hidden dependencies, slow releases, and a blast radius that grows with every consumer. The current HashiCorp Terraform […]
Kubernetes operations sit at the intersection of an API-driven control plane, Linux kernel isolation, container runtime behavior, networking, storage, security policy, and application lifecycle. Troubleshooting becomes unreliable when those layers are treated as separate trivia instead of as one operating system for distributed workloads. The KCNA blueprint covers scheduling, networking, storage, workload security, delivery, debugging, […]
ServiceNow Discovery needs credentials to log in to devices and infrastructure, but repeatedly trying every possible credential on every target is slow, noisy, and operationally risky. Credential affinity improves that behavior by remembering which credential successfully accessed a device so later discovery runs can try the known match first. Platform engineering must treat credential affinity […]
ServiceNow update sets are deceptively simple: they group configuration changes so those changes can move between instances. The governance challenge begins when many developers, administrators, application scopes, releases, emergency fixes, and parallel projects use the same transport mechanism. An update set can be technically valid and still be operationally unsafe because its contents are incomplete, […]
Reconciliation rules answer a question that appears only after identification succeeds: when several trusted sources describe the same CI, which source is allowed to change each attribute? Without that policy, the CMDB can become a competition between integrations where the latest write wins, values oscillate between sources, and nobody knows which field to trust. In […]
Terraform state is the shared record that connects resource addresses in configuration to real infrastructure objects. When several engineers or automation jobs use the same state, concurrent writes become dangerous: two runs can calculate plans from similar starting data and then race to update both infrastructure and the state record. The current HashiCorp Terraform Associate […]
CMDB identification rules decide whether incoming information describes a configuration item that already exists or a new CI that should be created. That single decision controls one of the most expensive failure modes in configuration management: duplicate records that look individually plausible but split ownership, incidents, relationships, and automation across several representations of the same […]
