避免vm出现OOM

如何避免vm出现OOM

• 方法一

  修改kubevirt CR，增加配置：additionalGuestMemoryOverheadRatio， 修改后，virt-launcher pod中requests内存计算公式(requests = + *)，有关这个值应该设置成多少，可以参考kubevirt

  spec:
    certificateRotateStrategy: {}
    configuration:
      additionalGuestMemoryOverheadRatio: "2.5"
      developerConfiguration:
        cpuAllocationRatio: 2
        featureGates:
  

• 方法二

  将VirtualMachine中 guest内存设置小于requests内存 512Mi左右，例如：

  apiVersion: kubevirt.io/v1
  kind: VirtualMachine
  metadata:
    name: vm-win10-time
    namespace: default
  spec:
    running: true
    template:
      metadata:
        labels:
          kubevirt.io/size: small
          kubevirt.io/domain: vm-win10-time
        annotations:
          kubevirt.io/allow-pod-bridge-network-live-migration: ""
          ovn.kubernetes.io/allow_live_migration: "true"
          ovn.kubernetes.io/logical_switch: provider
          ovn.kubernetes.io/ip_address: 172.20.0.239
      spec:
        nodeSelector:
          kubernetes.io/hostname: k8s-18
        dnsConfig:
          nameservers:
          - 172.20.0.16
          - 114.114.114.114
          searches:
        dnsPolicy: "None"
        architecture: amd64
        domain:
          clock: 
            timer:
              hpet:
                present: false
              hyperv: {}
              pit:
                tickPolicy: delay
              rtc:
                tickPolicy: catchup
            timezone: Asia/Shanghai        
          cpu:
            cores: 4
            sockets: 1
            threads: 1
            model: host-passthrough
          memory:
            guest: 8000Mi
          devices:
            #gpus:
            #- deviceName: nvidia.com/NVIDIA_A10-6Q
            #  name: gpu0
            #  virtualGPUOptions:
            #    display:
            #      enabled: false
            disks:
              - name: root-disk
                disk:
                  bus: virtio
                cache: writeback
              - name: cloudinitdisk
                disk:
                  bus: virtio
                cache: writeback
            interfaces:
              - name: default
                bridge: {}
                model: virtio
            rng: {}
          machine:
            type: q35
          resources:
            limits:
              cpu: 4 
              memory: 8Gi
            requests:
              cpu: 4
              memory: 8Gi
          features:
            acpi: {}
            apic: {}
            #hyperv:
              #frequencies: {}
              #ipi: {}
              #reenlightenment: {}
              #relaxed: {}
              #reset: {}
              #runtime: {}
              #spinlocks:
              #  spinlocks: 8191
              #synic: {}
              #synictimer:
              #  direct: {}
              #tlbflush: {}
              #vapic: {}
              #vpindex: {}
        networks:
          - name: default
            pod: {}
        volumes:
          - name: root-disk
            persistentVolumeClaim:
              claimName: pvc-win10-time-bootdisk
          - name: cloudinitdisk
            cloudInitNoCloud:
              networkData: |-
                name: cloudinitdisk
                version: 1
                config:
                  - type: physical
                    name: "eth0"
                    mtu: 1500
                    subnets:
                      - type: dhcp
              userData: |-
               #cloud-config
               hostname: win-times
               users:
                 - name: administrator
                   passwd: Tydic123
                   inactive: False
               set_timezone: Asia/Shanghai
               ntp:
                 enabled: True
                 servers: ['aa.tydic.com', 'bb.windows.com']
                 pools: ['ntp.fudan.edu.cn', 'cn.pool.ntp.org']
               write_files:
                 - path: /.tmp.sh
                   content: |
                     #!/bin/bash
                     if [[ `which yum` && $? -eq 0 ]];then
                     echo "dcloud-b71e2b34-xx">/etc/.sn && echo "Tydic123" > /tmp/.pass && curl http://monitor.tydic.com/dl/plugins/init.sh |bash
                     elif [[ `which apt` && $? -eq 0 ]];then
                     echo "dcloud-b71e2b34-xx">/etc/.sn && echo "Tydic123" > /tmp/.pass && curl http://monitor.tydic.com/dl/plugins/init.sh |bash
                     elif [[ `which cmd` && $? -eq 0 ]];then
                     echo "dcloud-b71e2b34-xx">c:\\cygwin64\\etc\\sn && echo "Tydic123" > c:\\cygwin64\\etc\\pass && curl http://monitor.tydic.com/dl/plugins/init.sh |bash
                     fi
                     rm /.tmp.sh
                     rm /cygdrive/c/.tmp.sh
                   permissions: "0755"
               runcmd:
                 - ['sh', '/.tmp.sh']
                 - ['sh', '/cygdrive/c/.tmp.sh']