Virtual Machine
A Virtual Machine (VM) simulates computer hardware, enabling various operating systems and applications to run in an isolated environment.
Deployment Details
The virtual machine is managed and hosted through KubeVirt, allowing you to harness the benefits of virtualization within your Kubernetes ecosystem.
- Docs: KubeVirt User Guide
- GitHub: KubeVirt Repository
Accessing virtual machine
You can access the virtual machine using the virtctl tool:
To access the serial console:
virtctl console <vm>
To access the VM using VNC:
virtctl vnc <vm>
To SSH into the VM:
virtctl ssh <user>@<vm>
Parameters
Common parameters
| Name | Description | Value |
|---|---|---|
external |
Enable external access from outside the cluster | false |
externalMethod |
specify method to passthrough the traffic to the virtual machine. Allowed values: WholeIP and PortList |
PortList |
externalPorts |
Specify ports to forward from outside the cluster | [] |
running |
Determines if the virtual machine should be running | true |
instanceType |
Virtual Machine instance type | u1.medium |
instanceProfile |
Virtual Machine preferences profile | ubuntu |
disks |
List of disks to attach | [] |
gpus |
List of GPUs to attach | [] |
resources.cpu |
The number of CPU cores allocated to the virtual machine | "" |
resources.memory |
The amount of memory allocated to the virtual machine | "" |
resources.sockets |
The number of CPU sockets allocated to the virtual machine (used to define vCPU topology) | "" |
sshKeys |
List of SSH public keys for authentication. Can be a single key or a list of keys. | [] |
cloudInit |
cloud-init user data config. See cloud-init documentation for more details. | "" |
cloudInitSeed |
A seed string to generate an SMBIOS UUID for the VM. | "" |
U Series
The U Series is quite neutral and provides resources for general purpose applications.
U is the abbreviation for "Universal", hinting at the universal attitude towards workloads.
VMs of instance types will share physical CPU cores on a time-slice basis with other VMs.
U Series Characteristics
Specific characteristics of this series are:
- Burstable CPU performance - The workload has a baseline compute performance but is permitted to burst beyond this baseline, if excess compute resources are available.
- vCPU-To-Memory Ratio (1:4) - A vCPU-to-Memory ratio of 1:4, for less noise per node.
O Series
The O Series is based on the U Series, with the only difference being that memory is overcommitted.
O is the abbreviation for "Overcommitted".
UO Series Characteristics
Specific characteristics of this series are:
- Burstable CPU performance - The workload has a baseline compute performance but is permitted to burst beyond this baseline, if excess compute resources are available.
- Overcommitted Memory - Memory is over-committed in order to achieve a higher workload density.
- vCPU-To-Memory Ratio (1:4) - A vCPU-to-Memory ratio of 1:4, for less noise per node.
CX Series
The CX Series provides exclusive compute resources for compute intensive applications.
CX is the abbreviation of "Compute Exclusive".
The exclusive resources are given to the compute threads of the VM. In order to ensure this, some additional cores (depending on the number of disks and NICs) will be requested to offload the IO threading from cores dedicated to the workload. In addition, in this series, the NUMA topology of the used cores is provided to the VM.
CX Series Characteristics
Specific characteristics of this series are:
- Hugepages - Hugepages are used in order to improve memory performance.
- Dedicated CPU - Physical cores are exclusively assigned to every vCPU in order to provide fixed and high compute guarantees to the workload.
- Isolated emulator threads - Hypervisor emulator threads are isolated from the vCPUs in order to reduce emaulation related impact on the workload.
- vNUMA - Physical NUMA topology is reflected in the guest in order to optimize guest sided cache utilization.
- vCPU-To-Memory Ratio (1:2) - A vCPU-to-Memory ratio of 1:2.
M Series
The M Series provides resources for memory intensive applications.
M is the abbreviation of "Memory".
M Series Characteristics
Specific characteristics of this series are:
- Hugepages - Hugepages are used in order to improve memory performance.
- Burstable CPU performance - The workload has a baseline compute performance but is permitted to burst beyond this baseline, if excess compute resources are available.
- vCPU-To-Memory Ratio (1:8) - A vCPU-to-Memory ratio of 1:8, for much less noise per node.
RT Series
The RT Series provides resources for realtime applications, like Oslat.
RT is the abbreviation for "realtime".
This series of instance types requires nodes capable of running realtime applications.
RT Series Characteristics
Specific characteristics of this series are:
- Hugepages - Hugepages are used in order to improve memory performance.
- Dedicated CPU - Physical cores are exclusively assigned to every vCPU in order to provide fixed and high compute guarantees to the workload.
- Isolated emulator threads - Hypervisor emulator threads are isolated from the vCPUs in order to reduce emaulation related impact on the workload.
- vCPU-To-Memory Ratio (1:4) - A vCPU-to-Memory ratio of 1:4 starting from the medium size.
Development
To get started with customizing or creating your own instancetypes and preferences see DEVELOPMENT.md.
Resources
The following instancetype resources are provided by Cozystack:
| Name | vCPUs | Memory |
|---|---|---|
| cx1.2xlarge | 8 | 16Gi |
| cx1.4xlarge | 16 | 32Gi |
| cx1.8xlarge | 32 | 64Gi |
| cx1.large | 2 | 4Gi |
| cx1.medium | 1 | 2Gi |
| cx1.xlarge | 4 | 8Gi |
| gn1.2xlarge | 8 | 32Gi |
| gn1.4xlarge | 16 | 64Gi |
| gn1.8xlarge | 32 | 128Gi |
| gn1.xlarge | 4 | 16Gi |
| m1.2xlarge | 8 | 64Gi |
| m1.4xlarge | 16 | 128Gi |
| m1.8xlarge | 32 | 256Gi |
| m1.large | 2 | 16Gi |
| m1.xlarge | 4 | 32Gi |
| n1.2xlarge | 16 | 32Gi |
| n1.4xlarge | 32 | 64Gi |
| n1.8xlarge | 64 | 128Gi |
| n1.large | 4 | 8Gi |
| n1.medium | 4 | 4Gi |
| n1.xlarge | 8 | 16Gi |
| o1.2xlarge | 8 | 32Gi |
| o1.4xlarge | 16 | 64Gi |
| o1.8xlarge | 32 | 128Gi |
| o1.large | 2 | 8Gi |
| o1.medium | 1 | 4Gi |
| o1.micro | 1 | 1Gi |
| o1.nano | 1 | 512Mi |
| o1.small | 1 | 2Gi |
| o1.xlarge | 4 | 16Gi |
| rt1.2xlarge | 8 | 32Gi |
| rt1.4xlarge | 16 | 64Gi |
| rt1.8xlarge | 32 | 128Gi |
| rt1.large | 2 | 8Gi |
| rt1.medium | 1 | 4Gi |
| rt1.micro | 1 | 1Gi |
| rt1.small | 1 | 2Gi |
| rt1.xlarge | 4 | 16Gi |
| u1.2xlarge | 8 | 32Gi |
| u1.2xmedium | 2 | 4Gi |
| u1.4xlarge | 16 | 64Gi |
| u1.8xlarge | 32 | 128Gi |
| u1.large | 2 | 8Gi |
| u1.medium | 1 | 4Gi |
| u1.micro | 1 | 1Gi |
| u1.nano | 1 | 512Mi |
| u1.small | 1 | 2Gi |
| u1.xlarge | 4 | 16Gi |
The following preference resources are provided by Cozystack:
| Name | Guest OS |
|---|---|
| alpine | Alpine |
| centos.7 | CentOS 7 |
| centos.7.desktop | CentOS 7 |
| centos.stream10 | CentOS Stream 10 |
| centos.stream10.desktop | CentOS Stream 10 |
| centos.stream8 | CentOS Stream 8 |
| centos.stream8.desktop | CentOS Stream 8 |
| centos.stream8.dpdk | CentOS Stream 8 |
| centos.stream9 | CentOS Stream 9 |
| centos.stream9.desktop | CentOS Stream 9 |
| centos.stream9.dpdk | CentOS Stream 9 |
| cirros | Cirros |
| fedora | Fedora (amd64) |
| fedora.arm64 | Fedora (arm64) |
| opensuse.leap | OpenSUSE Leap |
| opensuse.tumbleweed | OpenSUSE Tumbleweed |
| rhel.10 | Red Hat Enterprise Linux 10 Beta (amd64) |
| rhel.10.arm64 | Red Hat Enterprise Linux 10 Beta (arm64) |
| rhel.7 | Red Hat Enterprise Linux 7 |
| rhel.7.desktop | Red Hat Enterprise Linux 7 |
| rhel.8 | Red Hat Enterprise Linux 8 |
| rhel.8.desktop | Red Hat Enterprise Linux 8 |
| rhel.8.dpdk | Red Hat Enterprise Linux 8 |
| rhel.9 | Red Hat Enterprise Linux 9 (amd64) |
| rhel.9.arm64 | Red Hat Enterprise Linux 9 (arm64) |
| rhel.9.desktop | Red Hat Enterprise Linux 9 Desktop (amd64) |
| rhel.9.dpdk | Red Hat Enterprise Linux 9 DPDK (amd64) |
| rhel.9.realtime | Red Hat Enterprise Linux 9 Realtime (amd64) |
| sles | SUSE Linux Enterprise Server |
| ubuntu | Ubuntu |
| windows.10 | Microsoft Windows 10 |
| windows.10.virtio | Microsoft Windows 10 (virtio) |
| windows.11 | Microsoft Windows 11 |
| windows.11.virtio | Microsoft Windows 11 (virtio) |
| windows.2k16 | Microsoft Windows Server 2016 |
| windows.2k16.virtio | Microsoft Windows Server 2016 (virtio) |
| windows.2k19 | Microsoft Windows Server 2019 |
| windows.2k19.virtio | Microsoft Windows Server 2019 (virtio) |
| windows.2k22 | Microsoft Windows Server 2022 |
| windows.2k22.virtio | Microsoft Windows Server 2022 (virtio) |
| windows.2k25 | Microsoft Windows Server 2025 |
| windows.2k25.virtio | Microsoft Windows Server 2025 (virtio) |