健康检查¶

当配置云主机的存活（Liveness）和就绪（Readiness）探针时，与 Kubernetes 的配置过程相似。本文将介绍如何通过 YAML 为云主机配置健康检查参数。

但是需要注意：需要在云主机创建成功并且处于关机状态下，修改 YAML 进行配置。

配置 HTTP Liveness Probe¶

在 spec.template.spec 中配置 livenessProbe.httpGet。

修改 cloudInitNoCloud 以启动一个 HTTP 服务器。

点击查看 YAML 示例配置

apiVersion: kubevirt.io/v1
kind: VirtualMachine
metadata:
  annotations:
    kubevirt.io/latest-observed-api-version: v1
    kubevirt.io/storage-observed-api-version: v1
    virtnest.io/alias-name: ''
    virtnest.io/image-secret: ''
    virtnest.io/image-source: docker
    virtnest.io/os-image: release-ci.daocloud.io/virtnest/system-images/ubuntu-22.04-x86_64:v1
  creationTimestamp: '2024-10-15T02:39:45Z'
  finalizers:
    - kubevirt.io/virtualMachineControllerFinalize
  generation: 1
  labels:
    virtnest.io/os-family: Ubuntu
    virtnest.io/os-version: '22.04'
  name: test-probe
  namespace: amamba-team
  resourceVersion: '254032135'
  uid: 6d92779d-7415-4721-8c7b-a2dde163d758
spec:
  dataVolumeTemplates:
    - metadata:
        creationTimestamp: null
        name: test-probe-rootdisk
        namespace: amamba-team
      spec:
        pvc:
          accessModes:
            - ReadWriteOnce
          resources:
            requests:
              storage: 10Gi
          storageClassName: hwameistor-storage-lvm-hdd
        source:
          registry:
            url: >-
          docker://release-ci.daocloud.io/virtnest/system-images/ubuntu-22.04-x86_64:v1
  runStrategy: Halted
  template:
    metadata:
      creationTimestamp: null
    spec:
      architecture: amd64
      domain:
        cpu:
          cores: 1
          sockets: 1
          threads: 1
        devices:
          disks:
            - bootOrder: 1
              disk:
                bus: virtio
              name: rootdisk
            - disk:
                bus: virtio
              name: cloudinitdisk
          interfaces:
            - masquerade: {}
              name: default
        machine:
          type: q35
        memory:
          guest: 2Gi
        resources:
          requests:
            memory: 2Gi
      networks:
        - name: default
          pod: {}
      livenessProbe:
        initialDelaySeconds: 120
        periodSeconds: 20
        httpGet:
          port: 1500
        timeoutSeconds: 10
      volumes:
        - dataVolume:
            name: test-probe-rootdisk
          name: rootdisk
        - cloudInitNoCloud:
            userData: |
              #cloud-config
              ssh_pwauth: true
              disable_root: false
              chpasswd: {"list": "root:dangerous", expire: False}
              runcmd:
                - sed -i "/#\?PermitRootLogin/s/^.*$/PermitRootLogin yes/g" /etc/ssh/sshd_config
                - systemctl restart ssh.service
                - dhclient -r && dhclient
                - apt-get update && apt-get install -y ncat
                - ["systemd-run", "--unit=httpserver", "ncat", "-klp", "1500", "-e", '/usr/bin/echo -e HTTP/1.1 200 OK\nContent-Length: 12\n\nHello World!']
          name: cloudinitdisk

根据操作系统（如 Ubuntu/Debian 或 CentOS），userData 的配置可能有所不同。主要区别：
- 包管理器：
  
  Ubuntu/Debian 使用 apt-get 作为包管理器。 CentOS 使用 yum 作为包管理器。
- SSH 服务重启命令：
  
  Ubuntu/Debian 使用 systemctl restart ssh.service。 CentOS 使用 systemctl restart sshd.service（注意 CentOS 7 及之前版本使用 service sshd restart）。
- 安装的软件包：
  
  Ubuntu/Debian 安装 ncat。 CentOS 安装 nmap-ncat（因为 ncat 在 CentOS 的默认仓库中可能不可用）。

配置 TCP Liveness Probe¶

在 spec.template.spec 中配置 livenessProbe.tcpSocket。

点击查看 YAML 示例配置

apiVersion: kubevirt.io/v1
kind: VirtualMachine
metadata:
  annotations:
    kubevirt.io/latest-observed-api-version: v1
    kubevirt.io/storage-observed-api-version: v1
    virtnest.io/alias-name: ''
    virtnest.io/image-secret: ''
    virtnest.io/image-source: docker
    virtnest.io/os-image: release-ci.daocloud.io/virtnest/system-images/ubuntu-22.04-x86_64:v1
  creationTimestamp: '2024-10-15T02:39:45Z'
  finalizers:
    - kubevirt.io/virtualMachineControllerFinalize
  generation: 1
  labels:
    virtnest.io/os-family: Ubuntu
    virtnest.io/os-version: '22.04'
  name: test-probe
  namespace: amamba-team
  resourceVersion: '254032135'
  uid: 6d92779d-7415-4721-8c7b-a2dde163d758
spec:
  dataVolumeTemplates:
    - metadata:
        creationTimestamp: null
        name: test-probe-rootdisk
        namespace: amamba-team
      spec:
        pvc:
          accessModes:
            - ReadWriteOnce
          resources:
            requests:
              storage: 10Gi
          storageClassName: hwameistor-storage-lvm-hdd
        source:
          registry:
            url: >-
          docker://release-ci.daocloud.io/virtnest/system-images/ubuntu-22.04-x86_64:v1
  runStrategy: Halted
  template:
    metadata:
      creationTimestamp: null
    spec:
      architecture: amd64
      domain:
        cpu:
          cores: 1
          sockets: 1
          threads: 1
        devices:
          disks:
            - bootOrder: 1
              disk:
                bus: virtio
              name: rootdisk
            - disk:
                bus: virtio
              name: cloudinitdisk
          interfaces:
            - masquerade: {}
              name: default
        machine:
          type: q35
        memory:
          guest: 2Gi
        resources:
          requests:
            memory: 2Gi
      networks:
        - name: default
          pod: {}
      livenessProbe:
        initialDelaySeconds: 120
        periodSeconds: 20
        tcpSocket:
          port: 1500
        timeoutSeconds: 10
      volumes:
        - dataVolume:
            name: test-probe-rootdisk
          name: rootdisk
        - cloudInitNoCloud:
            userData: |
              #cloud-config
              ssh_pwauth: true
              disable_root: false
              chpasswd: {"list": "root:dangerous", expire: False}
              runcmd:
                - sed -i "/#\?PermitRootLogin/s/^.*$/PermitRootLogin yes/g" /etc/ssh/sshd_config
                - systemctl restart ssh.service
                - dhclient -r && dhclient
                - apt-get update && apt-get install -y ncat
                - ["systemd-run", "--unit=httpserver", "ncat", "-klp", "1500", "-e", '/usr/bin/echo -e HTTP/1.1 200 OK\nContent-Length: 12\n\nHello World!']
          name: cloudinitdisk

配置 Readiness Probes¶

在 spec.template.spec 中配置 readiness。

点击查看 YAML 示例配置

apiVersion: kubevirt.io/v1
kind: VirtualMachine
metadata:
  annotations:
    kubevirt.io/latest-observed-api-version: v1
    kubevirt.io/storage-observed-api-version: v1
    virtnest.io/alias-name: ''
    virtnest.io/image-secret: ''
    virtnest.io/image-source: docker
    virtnest.io/os-image: release-ci.daocloud.io/virtnest/system-images/ubuntu-22.04-x86_64:v1
  creationTimestamp: '2024-10-15T02:39:45Z'
  finalizers:
    - kubevirt.io/virtualMachineControllerFinalize
  generation: 1
  labels:
    virtnest.io/os-family: Ubuntu
    virtnest.io/os-version: '22.04'
  name: test-probe
  namespace: amamba-team
  resourceVersion: '254032135'
  uid: 6d92779d-7415-4721-8c7b-a2dde163d758
spec:
  dataVolumeTemplates:
    - metadata:
        creationTimestamp: null
        name: test-probe-rootdisk
        namespace: amamba-team
      spec:
        pvc:
          accessModes:
            - ReadWriteOnce
          resources:
            requests:
              storage: 10Gi
          storageClassName: hwameistor-storage-lvm-hdd
        source:
          registry:
            url: >-
          docker://release-ci.daocloud.io/virtnest/system-images/ubuntu-22.04-x86_64:v1
  runStrategy: Halted
  template:
    metadata:
      creationTimestamp: null
    spec:
      architecture: amd64
      domain:
        cpu:
          cores: 1
          sockets: 1
          threads: 1
        devices:
          disks:
            - bootOrder: 1
              disk:
                bus: virtio
              name: rootdisk
            - disk:
                bus: virtio
              name: cloudinitdisk
          interfaces:
            - masquerade: {}
              name: default
        machine:
          type: q35
        memory:
          guest: 2Gi
        resources:
          requests:
            memory: 2Gi
      networks:
        - name: default
          pod: {}
      readiness:
        initialDelaySeconds: 120
        periodSeconds: 20
        httpGet:
          port: 1500
        timeoutSeconds: 10
      volumes:
        - dataVolume:
            name: test-probe-rootdisk
          name: rootdisk
        - cloudInitNoCloud:
            userData: |
              #cloud-config
              ssh_pwauth: true
              disable_root: false
              chpasswd: {"list": "root:dangerous", expire: False}
              runcmd:
                - sed -i "/#\?PermitRootLogin/s/^.*$/PermitRootLogin yes/g" /etc/ssh/sshd_config
                - systemctl restart ssh.service
                - dhclient -r && dhclient
                - apt-get update && apt-get install -y ncat
                - ["systemd-run", "--unit=httpserver", "ncat", "-klp", "1500", "-e", '/usr/bin/echo -e HTTP/1.1 200 OK\nContent-Length: 12\n\nHello World!']
          name: cloudinitdisk