Virtual Appliance Requirements
- For information about license and package requirements, see Determine Your Current Package.
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At a minimum, to process millions of DNS queries per day, allocate these resources for each VA:
- Two virtual CPU cores
- 2GB RAM
- 7GB of disk space
- Deploy two Virtual Appliances in a Site.
VAs must be deployed in pairs to ensure redundancy at the DNS level and to allow for updates without downtime.
- Download a fresh image from Secure Access for each deployment.
- Ensure your hypervisor host has the correct date and time. The incorrect date or time can cause update or sync issues with the VAs. The VA syncs time independently and is always set to UTC by default. For more information, see, Network Time Protocol Servers.
- Each VA can process millions of DNS requests in a single day. If your network could exceed this number, see Virtual Appliance Sizing Guide.
- VAs deployed on platforms such as Amazon Web Services and Google Cloud Platform require a minimum of 1GB RAM per CPU core.