Things to consider before migration to new hardware

• Are you going to keep same DC host name ?
• Are you going to use same IP address?
• If you are changing your name and IP if it will have influence on your network ( Firewall Roles etc..)
• Is the server DHCP server
• Is the server root CA? – I’m not sure if you can migrate Enterprise Root CA – May be Restore from Backup
• Is the server Global Catalog ?

Preparation steps

• Make full Backup of your Active Directory
• Install new server and join it to your domain
  • Install DNS Service (use active directory integrated zone) that will allow DNS records to replicate
  • Install DHCP service on. Migrate DHCP database. Read MS Article
    
  • Migrate FSMO roles to new installed server: See transfer FSMO rules
    
  • Set New server as Global Catalog if you don’t have other DC in your site that operates as Global Catalog: Read MS Artcle
    

Remove old machine from domain

• Demote the domain controller by running DCpromo
  
• Disjoin the server from the domain.

Hope It helped

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