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VM Image Prerequisites

Before beginning installation, please be sure to have a host system with the following resources available:

  • A system with the ability to run a VM image and at least 8 GB of assigned memory.

    Tip: The needed assigned memory for a VM image will vary depending on the Tenable applications enabled. Please refer to the installation documentation for the individual applications for memory recommendations and adjust the VM memory setting as appropriate.

  • At least 200 GB of free disk space to accommodate the base VM image for the standard appliance or 50GB for the light appliance. If you choose to increase the VM disk size, ensure the extra space is available on the VM host system.
  • Tip: The default disk size can not be decreased. Additionally, the needed assigned disk space for a VM image will vary depending on the Tenable applications enabled. Refer to the installation documentation for individual applications for disk space recommendations and adjust the VM disk space available to Hard Disk 2 of the Appliance VM image as appropriate. More information on expanding the disk space is available here.

  • A system with the ability to run a VM image with at least 4 CPUs assigned.

    Tip: VM ESX hotplug support has been added, allowing users to allocate additional resources like CPUs and memory to the Appliance VM without having to reboot.

  • At least one IP address for the Appliance. By default, the VM Appliance will obtain an IP address from a DHCP server, if one is available. Otherwise, a fixed address, netmask, and optional gateway may be assigned during the installation process. If there is a DHCP server available, but a static IP address is to be assigned, this may be set during the configuration process. Using multiple addresses allows for multi-homing the Appliance on different network segments to cut down on the network load.

    Tip: As with any security management device, a static IP address (assigned manually or via DHCP) is recommended for use on the Appliance network interfaces.

Along with the IP address, the following values must be configured for the Tenable VM Appliance to be network accessible:

  • The network subnet mask for the Appliance.
  • The IP address of the Default Gateway for the Appliance (if applicable).
  • The IP addresses of the DNS servers for the Appliance (if applicable).
  • A hostname for the Appliance.

Note: It is necessary to have a hostname available to assign to the Appliance during installation to ensure the SSL certificate is generated properly. The Appliance ships with the default hostname of tnsAppliance. Whenever the hostname is changed, a new server certificate will be generated and the device will require a reboot.

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