OpenKruise 简介

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# sidecarset.yaml
apiVersion: apps.kruise.io/v1alpha1
kind: SidecarSet
metadata:
  name: test-sidecarset
spec:
  selector:
    matchLabels:
      app: nginx
  strategy:
    rollingUpdate:
      maxUnavailable: 2
  containers:
  - name: sidecar1
    image: centos:6.7
    command: ["sleep", "999d"] # do nothing at all
    volumeMounts:
    - name: log-volume
      mountPath: /var/log
  volumes: # this field will be merged into pod.spec.volumes
  - name: log-volume
    emptyDir: {}

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apiVersion: v1
kind: Pod
metadata:
  labels:
    app: nginx # matches the SidecarSet's selector
  name: test-pod
spec:
  containers:
  - name: app
    image: nginx:1.15.1

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kind: Pod
apiVersion: v1
metadata:
  name: mypod
  labels:
    foo: bar
spec:
  topologySpreadConstraints:
  - maxSkew: 1
    topologyKey: zone
    whenUnsatisfiable: DoNotSchedule
    labelSelector:
      matchLabels:
        foo: bar
  containers:
  - name: pause
    image: k8s.gcr.io/pause:3.1

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apiVersion: kubescheduler.config.k8s.io/v1beta1
kind: KubeSchedulerConfiguration

profiles:
  - pluginConfig:
      - name: PodTopologySpread
        args:
          defaultConstraints:
            - maxSkew: 1
              topologyKey: topology.kubernetes.io/zone
              whenUnsatisfiable: ScheduleAnyway

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apiVersion: apps.kruise.io/v1alpha1
kind: UnitedDeployment
metadata:
  name: sample-ud
spec:
  replicas: 6
  revisionHistoryLimit: 10
  selector:
    matchLabels:
      app: sample
  template:
    statefulSetTemplate:
      metadata:
        labels:
          app: sample
      spec:
        selector:
          matchLabels:
            app: sample
        template:
          metadata:
            labels:
              app: sample
          spec:
            containers:
            - image: nginx:alpine
              name: nginx
  topology:
    subsets:
    - name: subset-a
      nodeSelectorTerm:
        matchExpressions:
        - key: node
          operator: In
          values:
          - zone-a
      replicas: 1
    - name: subset-b
      nodeSelectorTerm:
        matchExpressions:
        - key: node
          operator: In
          values:
          - zone-b
      replicas: 50%
    - name: subset-c
      nodeSelectorTerm:
        matchExpressions:
        - key: node
          operator: In
          values:
          - zone-c
  updateStrategy:
    manualUpdate:
      partitions:
        subset-a: 0
        subset-b: 0
        subset-c: 0
    type: Manual
...

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type Topology struct {
  // ClusterRegistryQuerySpec is used to find the all the clusters that
  // the workload may be deployed to. 
  ClusterRegistry *ClusterRegistryQuerySpec
  // Contains the details of each subset including the target cluster name and
  // the node selector in target cluster.
  Subsets []Subset
}

type ClusterRegistryQuerySpec struct {
  // Namespaces that the cluster objects reside.
  // If not specified, default namespace is used.
  Namespaces []string
  // Selector is the label matcher to find all qualified clusters.
  Selector   map[string]string
  // Describe the kind and APIversion of the cluster object.
  ClusterType metav1.TypeMeta
}

type Subset struct {
  Name string

  // The name of target cluster. The controller will validate that
  // the TargetCluster exits based on Topology.ClusterRegistry.
  TargetCluster *TargetCluster

  // Indicate the node select strategy in the Subset.TargetCluster.
  // If Subset.TargetCluster is not set, node selector strategy refers to
  // current cluster.
  NodeSelector corev1.NodeSelector

  Replicas *intstr.IntOrString 
}

type TargetCluster struct {
  // Namespace of the target cluster CRD
  Namespace string
  // Target cluster name
  Name string
}