In this article, we’ll consider a high-available failover configuration of two squid (Linux) proxy servers to access the Internet from a corporate LAN. To build a failover configuration we are going to create an HA cluster using keepalived.
An HA cluster is a group of servers with embedded redundancy to minimize the app downtime in case of hardware or software issues of any of the servers in the group. According to this definition, the following must be implemented for correct operation of an HA cluster:
Windows Server: Administration Guides
Step-by-step tutorials and comprehensive courses covering Windows Server installation, configuration, administration, and management. Learn to deploy server roles, manage Active Directory, configure networking, automate tasks with PowerShell, and implement security best practices for Windows Server 2012, 2016, 2019, and 2022 editions. Ideal for beginners and IT professionals seeking practical, hands-on knowledge to master Windows Server environments.
Windows 10 and 11 Tutorials for System Administrators
Guides and technical tutorials for system administrators, focusing on the configuration, deployment, and management of Windows 10 and Windows 11 desktop operating systems. Step-by-step instructions on installation, deployment, policy configuration, security hardening, and administrative tools to optimize Windows enterprise environments.
Group Policy (GPO) Guides for Admins
Clear, concise tutorials on creating and managing Group Policy Objects to control user and computer settings, enforce security, and streamline network administration in Active Directory environments.
- Configuring Firewall Rules With Group Policy
- How to Copy Files or Folders to All Computers with GPO
- Updating Group Policy Administrative Templates (ADMX) Files
- Active Directory Password Policy
- Applying Group Policy troubleshooting guidance
- Deploying printers via GPO
- Running PowerShell scripts using Group Policy
- Local Groups Policies export and import on Windows
Active Directory: Setup, Configuration, and Best Practices
Step-by-step tutorials and comprehensive resources for installing, configuring, and managing Active Directory Domain Services (AD DS). Learn how to set up domain controllers, design forest and domain structures, create users and groups, and implement security best practices.
- Updating AD Group Membership Without Restart or Logoff
- How to Detect the Source of Account Lockout in Active Directory
- Adding an Additional Domain Controller To an Existing AD Domain
- Active Directory Health Check
- Get-ADDomainController: How to Get Domain Controller Information with Powershell
- How to Transfer os Seize FSMO Roles in Active Directory
- Active Directory Backup Best Practices
- How to Reset Domain Admin Password in Active Directory
- Fix Trust Relationship Failed Issue without Domain Rejoining
- How to Extend Password Expire Date in Active Directory
- How to Find Inactive Accounts in Active Directory
Enterprise Virtualization Platforms
Expert guides and tutorials for system administrators on VMware, Hyper-V, and Proxmox virtualization. Covering installation, configuration, management, and optimization to build robust and scalable virtual environments.
PowerShell Scripting Tutorials
Practical guides to automate and manage a wide range of IT tasks using PowerShell. Learn how to streamline system administration, Active Directory, network configuration, software deployment, Microsoft 365 management, and more through powerful scripting and cmdlets.
VMware:Install and Configure Guides
Detailed walkthroughs for installing VMware ESXi, vCenter Server, and VMware Workstation Player, including configuration of virtual machines, network settings, and storage options to optimize your virtual infrastructure.
- VMware ESXi: Create VMFS Datastore on USB Drives
- Configuring iSCSI Datastore on VMware ESXi
- Add Drivers into VMWare ESXi Installation Image
- Adding Sound Controller to a VMWare VM
- Using Free VMware vSphere Hypervisor
- Adding an ESXi host to the VMware vCenter (vCSA)
- Reset VMware ESXi root password
- Disable the Virtual Machine Auto Suspend Feature in VMware Workstation/Player
- Windows 10Windows 11Windows Server 2019
How to View and Clear RDP Connections History in Windows
March 11, 2024The built-in Windows Remote Desktop Connection client (mstsc.exe) saves the remote computer name (or IP address) and the username that is used to log in after each successful connection to…
Mbr2gpt.exe is a new built-in Windows 10 console tool that allows you to convert a disk with the MBR (Master Boot Record) partition table to a GPT (GUID Partition Table)…
- Active DirectoryPowerShellWindows Server 2022
Backing Up Active Directory with Windows Server Backup
November 26, 2024In this article, we’ll cover how to back up Active Directory domain controllers and enable automatic AD backups using PowerShell and the built-in Windows Server Backup feature.
- Windows 10Windows 11
How to Upgrade Windows Build from an ISO File with Setup.exe CMD
November 7, 2024The standard setup.exe installer in the Windows distro can be used to interactively install the operating system or update the OS version (install the feature update) on the computer. In…
- LinuxVirtualizationWindows Server 2019
KVM: How to Expand or Shrink a Virtual Machine Disk Size?
March 11, 2024In this article we’ll talk about how to resize KVM virtual machine disks for popular disk types. We’ll show how to correctly increase a virtual machine disk size in the…
- PowerShellWindows 10Windows Server 2019
Protecting Remote Desktop (RDP) Host from Brute Force Attacks
February 5, 2024Any Windows host directly connected to the Internet with an open RDP port is periodically logged for remote brute-force password attempts. To effectively protect the default Remote Desktop protocol port…
- Windows 10Windows 11Windows Server 2022
Software RAID1 (Mirror) for Boot Drive on Windows
February 24, 2025Tools for creating software RAID arrays from multiple physical disks are built into Windows. First, let’s look at a simple configuration where you need to create a mirror of two…
- PowerShellWindows Server 2019
Managing Windows Server Roles & Features with PowerShell
March 17, 2024In Windows Server 2012R2/2016/2019, you can use the graphical Server Manager console to install and remove server roles and features. However, in most cases, you can do the same from…
- Active DirectoryPowerShell
Get-ADDomainController: Getting Domain Controllers Info via PowerShell
July 8, 2022You can use the Get-ADDomainController PowerShell cmdlet to get information about the domain controllers in Active Directory. This cmdlet is a part of PowerShell Active Directory module and requires RSAT…