VMware Cloud Foundation network and security design has to connect several layers that are easy to discuss separately: physical uplinks, vSphere distributed switching, VMkernel traffic, […]
Certifications
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HashiCorp 004: Terraform Ephemeral Values and Write-Only Arguments
Terraform’s newer secret-handling features solve a long-standing infrastructure-as-code problem: some values are needed during an operation but should not be written into plan or state […]
HashiCorp 004: Terraform Lifecycle Rules
Terraform normally builds a dependency graph, compares configuration with state and provider data, and then chooses create, update, replace, or destroy actions. Lifecycle rules let […]
HashiCorp 004: Terraform Validation and Check Blocks
Terraform can validate infrastructure assumptions at several different stages: when module inputs are accepted, before a resource is created, after a resource or data source […]
HashiCorp 004: HCP Terraform Workspaces vs Projects
HCP Terraform workspaces and projects solve different organization problems. A workspace is the operational boundary where a Terraform configuration has runs, variables, state, permissions, and […]
HashiCorp 004: Terraform State Refactoring
Terraform state refactoring is the discipline of changing configuration structure without accidentally telling Terraform to destroy infrastructure that should remain in place. Renaming a resource, […]
HashiCorp 004: Terraform Modules and Provider Versioning
Terraform modules make infrastructure reusable, but reuse creates a dependency-management problem: teams need module code, provider plugins, and Terraform itself to evolve without making every […]
CNCF KCNA: Pods, Deployments, ReplicaSets, and Services
Kubernetes becomes much easier to understand once Pods, Deployments, ReplicaSets, and Services are viewed as different layers rather than interchangeable objects. Pods run containers. ReplicaSets […]
CNCF KCNA: Cloud Native Observability Basics
Cloud-native observability is the practice of understanding a distributed system from the telemetry it produces. Metrics show numerical behavior over time, logs record discrete events, […]
CNCF KCNA: GitOps for Kubernetes Delivery
GitOps is an operating model in which a system’s desired state is declared, versioned, and continuously reconciled with the running environment. Kubernetes is a natural […]
Juniper JN0-253: Mist SLEs and Root Cause Analysis
Juniper Mist service-level expectations turn wireless troubleshooting away from a device-first question—“Is the access point up?”—and toward a user-experience question: “Did the connection meet the […]
Juniper JN0-336: Juniper ATP Cloud and Encrypted Traffic Insights
Encrypted traffic creates a security dilemma: organizations need visibility into malicious behavior, but decrypting every session can create privacy, performance, and operational costs. Juniper Advanced […]
Juniper JN0-336: Junos Chassis Cluster Troubleshooting
An SRX chassis cluster is designed to preserve firewall service when a node or monitored component fails, but high availability introduces its own failure modes. […]
Juniper JN0-650: Junos EVPN-VXLAN Design and Troubleshooting
EVPN-VXLAN separates a data-center fabric into an IP underlay and an overlay that can extend Layer 2 and Layer 3 services across that underlay. VXLAN […]
Juniper JN0-650: Junos Class of Service Fundamentals
Junos Class of Service, or CoS, controls how packets are classified, queued, scheduled, dropped, shaped, and marked as they pass through a device. It is […]