Itential Validated Designs

A Developer Architecture (DA) is an Itential architecture where all of the components are installed as singletons and can not gracefully tolerate failures. This architecture is not recommended for production environments and testing environments that require strict uptimes and redundancies. This architecture is suitable for development environments only. The IAP application performs many reads and writes against the database and is sensitive to great latencies. All components must be installed in the same datacenter. All components must have authentication enabled.

The DA architecture is comprised of 4 VMs broken down as follows:

• 1 IAP server
• 1 MongoDB server
• 1 Redis server
• 1 IAG server

Itential Enterprise Server

MongoDB Server

Redis Server

IAG Server

Hardware & Hypervisor Configurations

Processor

The processor specification requirement is as follow:

• Second generation or better Intel Xeon Platinum 8000 series processors.
• Third generation or better AMD EPYC 7000 series processors.

Memory

The memory specification requirement is as follow:

• DDR5 DRAM 3200 Mhz or higher

Storage

The storage performance requirement in IOPS (16 kiB) is as follows:

• 20000+ IOPS
• Non-spinning media (i.e. SSD, NVMe)

Network

The network speed requirement is:

• 10 Gbps or higher

Note: In some instances, adding additional dedicated interfaces that are focused on routing specific traffic to specific external systems can be explored further. This routing of traffic would be configured at the OS-level (custom interfaces and routes) and require the system administrator to manage this. An example would be separating NSO traffic from Redis/Mongo destined traffic.

Hypervisor/Host OS Settings

These settings are strongly recommended for high load applications of IAP:

• CPU affinity settings or similar functionality to prevent CPU starvation
• Full Memory Reservation
• One physical CPU per VM is preferred
• Huge pages for memory support enabled
  • Except MongoDB
    Note: MongoDB discourages the utilization of Transparent Huge Pages
• Memory compression disabled
• Minimal CPU Allocation settings for scheduler according to CPU clock
  • Example: assuming an IAP VM on a server capable of 2.5GHz nominal speed: CPU clock reservation = 16vCPU * x 2.5GHz

Note: Please follow Hypervisor recommendations when performing CPU reservations. In most cases the total of all CPU reservations for all VMs on a host cannot be more than 90% of the host capacity as 10% is reserved by the host itself.

Ports & Networking

In an environment where components are installed on more than one host, the following network traffic flows need to be allowed. All is TCP protocol unless otherwise noted. Not all ports will need to be open for every supported architecture. Secure ports are only required when explicitly configured.

Required User Accounts in Dependencies

The validated designs are very opinionated installations of Itential and its dependencies. The following user accounts are required by the dependencies for a validated design and are used for the following purposes.

MongoDB

Redis