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- The virt-controller and the virt-handler listen on node status through the watch interface provided by api-server
- A new VMI definition similar with a plain pod is posted to the kubelet
- The K8s API Server validates the input and creates a VMI custom resource definition (CRD) object.
- The virt-controller observes the creation of the new VMI object and creates a corresponding pod.
- Kubernetes schedules the pod on a host.
- The virt-controller observes that a pod for the VMI got started and updates the nodeName field in the VMI object.
- The virt-handler (DaemonSet) observes that a VMI got assigned to the host where it is running on.
- The virt-handler is using the VMI Specification and signals the creation of the corresponding domain using a libvirtd instance in the VMI's pod.
- A client deletes the VMI object through the virt-api-server.
- When Kubernetes runtime attempts to shutdown the virt-launcher pod before the VM/VMI has exited, the virt-launcher forwards signals from Kubernetes to the VM/VMI process and attempts to hold off the termination of the pod until the VM/VMI has shutdown successfully.
- The virt-handler observes the deletion and turns off the domain.
QAT
scenario
Brief Introduction
Intel QuickAssist Technology is developed by Intel and runs on the Intel Architecture to provide security and compression acceleration capabilities to improve performance and efficiency. It will offload the workloads like cryptography and compression from the CPU to handware. Server, networking, big data, and storage applications use Intel QuickAssist to offload compute-intensive operations, such as:
- Symmetric cryptography functions, including cipher operations and authentication operations
- Public key functions, including RSA, Diffie-Hellman, and elliptic curve cryptography,
- Compression and decompression functions, including DEFLATE
It has made great benefits in many areas, such as Hadoop Acceletation, OpenSSL Integration, –Integration with SDN and NFV Solutions Boost and so on.
–4G LTE and 5G encryption algorithm offload for mobile gateways and infrastructure.
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–I/O virtualization using PCI-SIG Single-Root I/O Virtualization (SR-IOV).
–Accelerating Hadoop*
Handware
- Chipset: Intel® C6xx Series Chipsets
- PCIE: Intel® QuickAssist Adapter 89xx
- SoC: Intel Atom® Processor C3000 Series (Denverton NS) / Rangeley
Features
- QAT provides security (encryption) HW acceleration and compression HW acceleration
- QAT makes use of a set of APIs to abstract out the hardware, so the same application can run on multiple generations of QAT hardware
- Customers can also make use of patches that QAT has provided to popular open source software, so they can minimize or eliminate their effort to learn the API
With above support, QAT makes it easier for developers to integrate the accelerators in their designs and thus decrease the development time. And it can increases business flexibility by offering solutions that best fit the changing business requirements. It also frees up the valuable cycles on processors and allows it to perform value-added functionality.
What's more, QAT provides a uniform means of communication between accelerators, applications, and acceleration technologies. Due to this, the resources are managed more productively. Then It can boost application throughput, by reducing the demand on the platform and maximizes the CPU utilization.-Accelerating OpenSSL
Gaps
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