Dependencies and Prerequisites¶
This page explains the dependencies and prerequisites for installing virtual machine.
Info
The term virtnest mentioned in the commands or scripts below is the internal development codename for the Global Management module.
Prerequisites¶
Kernel version being above v4.11¶
The kernel version of all nodes in the target cluster needs to be higher than v4.11. For detail information, see kubevirt issue. Run the following command to see the version:
Example output:
Linux master 6.5.3-1.el7.elrepo.x86_64 #1 SMP PREEMPT_DYNAMIC Wed Sep 13 11:46:28 EDT 2023 x86_64 x86_64 x86_64 GNU/Linux
CPU supporting x86-64-v2 instruction set or higher¶
You can use the following script to check if the current node's CPU is usable:
Note
If you encounter a message like the one shown below, you can safely ignore it as it does not impact the final result.
cat <<EOF > detect-cpu.sh
#!/bin/sh -eu
flags=$(cat /proc/cpuinfo | grep flags | head -n 1 | cut -d: -f2)
supports_v2='awk "/cx16/&&/lahf/&&/popcnt/&&/sse4_1/&&/sse4_2/&&/ssse3/ {found=1} END {exit !found}"'
supports_v3='awk "/avx/&&/avx2/&&/bmi1/&&/bmi2/&&/f16c/&&/fma/&&/abm/&&/movbe/&&/xsave/ {found=1} END {exit !found}"'
supports_v4='awk "/avx512f/&&/avx512bw/&&/avx512cd/&&/avx512dq/&&/avx512vl/ {found=1} END {exit !found}"'
echo "$flags" | eval $supports_v2 || exit 2 && echo "CPU supports x86-64-v2"
echo "$flags" | eval $supports_v3 || exit 3 && echo "CPU supports x86-64-v3"
echo "$flags" | eval $supports_v4 || exit 4 && echo "CPU supports x86-64-v4"
EOF
chmod +x detect-cpu.sh
sh detect-cpu.sh
All Nodes having hardware virtualization (nested virtualization) enabled¶
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Run the following command to check if it has been achieved:
# Successful case QEMU: Checking for hardware virtualization : PASS QEMU: Checking if device /dev/kvm exists : PASS QEMU: Checking if device /dev/kvm is accessible : PASS QEMU: Checking if device /dev/vhost-net exists : PASS QEMU: Checking if device /dev/net/tun exists : PASS QEMU: Checking for cgroup 'cpu' controller support : PASS QEMU: Checking for cgroup 'cpuacct' controller support : PASS QEMU: Checking for cgroup 'cpuset' controller support : PASS QEMU: Checking for cgroup 'memory' controller support : PASS QEMU: Checking for cgroup 'devices' controller support : PASS QEMU: Checking for cgroup 'blkio' controller support : PASS QEMU: Checking for device assignment IOMMU support : PASS QEMU: Checking if IOMMU is enabled by kernel : PASS QEMU: Checking for secure guest support : WARN (Unknown if this platform has Secure Guest support) # Failure case QEMU: Checking for hardware virtualization : FAIL (Only emulated CPUs are available, performance will be significantly limited) QEMU: Checking if device /dev/vhost-net exists : PASS QEMU: Checking if device /dev/net/tun exists : PASS QEMU: Checking for cgroup 'memory' controller support : PASS QEMU: Checking for cgroup 'memory' controller mount-point : PASS QEMU: Checking for cgroup 'cpu' controller support : PASS QEMU: Checking for cgroup 'cpu' controller mount-point : PASS QEMU: Checking for cgroup 'cpuacct' controller support : PASS QEMU: Checking for cgroup 'cpuacct' controller mount-point : PASS QEMU: Checking for cgroup 'cpuset' controller support : PASS QEMU: Checking for cgroup 'cpuset' controller mount-point : PASS QEMU: Checking for cgroup 'devices' controller support : PASS QEMU: Checking for cgroup 'devices' controller mount-point : PASS QEMU: Checking for cgroup 'blkio' controller support : PASS QEMU: Checking for cgroup 'blkio' controller mount-point : PASS WARN (Unknown if this platform has IOMMU support) -
Install virt-host-validate:
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Methods to enable hardware virtualization
Methods vary from platforms, and this page takes vsphere as an example. See vmware website.
If using Docker Engine as the container runtime¶
If Docker Engine is used as the container runtime, it must be higher than v20.10.10.
Enabling IOMMU is recommended¶
To prepare for future functions, it is recommended to enable IOMMU.