A Linux network bridge acts like a virtual switch, forwarding frames between connected interfaces at Layer 2. Bridges are essential when running virtual machines with QEMU/KVM or containers (Podman/Docker) that need full network access on the same subnet as the host. On RHEL 8, NetworkManager is the authoritative networking service, and nmcli is the recommended […]
Network File System (NFS) is a distributed filesystem protocol that allows RHEL 8 servers to export directories over the network so that client machines can mount and use them as if they were local storage. NFS is a cornerstone of Linux infrastructure, used in everything from home lab setups to large-scale HPC clusters and virtualization […]
Packer, created by HashiCorp, is an open-source tool that automates the creation of identical machine images for multiple platforms from a single source configuration. Whether you need an AWS AMI, a QEMU disk image for local testing, or a VMware template, Packer lets you define the entire build in code using HCL2 templates. In this […]
HashiCorp Packer is an open-source tool for creating identical machine images for multiple platforms from a single configuration source. Rather than manually configuring servers after deployment, Packer bakes your configuration — packages, users, services, certificates — directly into the image at build time, embodying the immutable infrastructure pattern. The resulting AMIs, OVA files, or container […]
How to Configure Hyper-V Replica for Disaster Recovery on Windows Server 2012 R2 Hyper-V Replica is an asynchronous virtual machine replication feature built into Windows Server 2012 R2 Hyper-V. It continuously replicates virtual machines from a primary site to a replica site over HTTP or HTTPS, enabling rapid failover when the primary site experiences an […]
Vagrant is a command-line tool for creating and managing reproducible local development environments backed by virtual machines. Combined with VirtualBox as a hypervisor, it lets developers spin up a fresh Linux VM with a single command, configure it through a version-controlled Vagrantfile, and destroy it just as easily. This eliminates the “works on my machine” […]
How to Configure Software-Defined Networking Basics on Windows Server 2012 R2 Software-Defined Networking (SDN) in Windows Server 2012 R2 is implemented through Hyper-V Network Virtualization (HNV), which allows multiple tenant networks to coexist on a shared physical network fabric while remaining logically isolated. HNV uses NVGRE (Network Virtualization Generic Routing Encapsulation) to encapsulate virtual machine […]
Terraform is HashiCorp’s open-source Infrastructure as Code (IaC) tool that allows provisioning and managing cloud infrastructure (VMs, databases, networks, DNS records, Kubernetes clusters) using declarative configuration files. Unlike Ansible (which is primarily a configuration management tool that executes tasks imperatively), Terraform maintains a state file that tracks the real-world infrastructure it manages — allowing it […]
How to Set Up iSCSI Initiator on Windows Server 2012 R2 The iSCSI Initiator allows Windows Server 2012 R2 to connect to iSCSI storage targets — shared storage devices that expose block-level storage over a standard IP network. iSCSI is widely used for connecting servers to SAN (Storage Area Network) devices, NAS appliances with iSCSI […]
How to Configure SMB Multichannel on Windows Server 2012 R2 SMB Multichannel is an SMB 3.0 feature in Windows Server 2012 R2 that enables a single SMB session to use multiple network connections simultaneously. This provides three major benefits: increased throughput by aggregating bandwidth from multiple network adapters or multiple paths, fault tolerance through automatic […]
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