@openit said in System Admin - checklist for Don'ts and Important points please!:
- Not recommended to convert Physical Server which has Domain Controller to Virtual Machine.
- Need to choose right Generation (1 or 2) type VM on Hyper-V, because later we can't change the generation.
- Don't set Static IP of some server/machine without consulting Network Team, to avoid conflicts with existing DHCP scope.
Your inputs matters a lot to me, and might help others in community as well.
Thanks!
1: That depends. A DC could be virtualized until such time as one is ready to run a full migration. Server 2019 ADDS requires DFSR. So, existing FRS DCs would need to be migrated to DFSR first. This is an invasive process that requires System State backups of FSMO/PDCe and at least one secondary DC.
2: Always Gen2 unless the OS to be dropped into the VM does not support it. P2V of older workloads for example. Use what is required.
3: The subnet should be documented somewhere. MAC addresses, IP addresses, DHCP scope(s), DHCP settings, and so on. Advanced IP Scanner is free and is a good place to start if none exist. There are other tools out there.
4: Group Policy: Follow best practices. Don't touch the Default Domain and Default Domain Controllers policies. Always set up the OU/GPO structure and settings according to the org's needs.
5: Hyper-V standalone: We don't join the host to the guest's domain. It presents a barrier to a ransomware compromise.
6: Backup: A backup is not considered "Good" until it is fully bare metal/hypervisor restored. Spot file/folder restores are not a verification method.
7: No Remote Desktop Protocol (RDP) port forwards (NAT) from the Internet (alternate port) to 3389 on the intended destination. Ever. Use Remote Desktop Gateway and add DUO or other 2FA to the mix.