Kubernetes(k8s)的调度器 - 调度亲和性详细介绍
节点亲和性
pod.spec.nodeAffinity
- preferredDuringSchedulingIgnoredDuringExecution:软策略
- requiredDuringSchedulingIgnoredDuringExecution:硬策略
requiredDuringSchedulingIgnoredDuringExecution
apiVersion: v1
kind: Pod
metadata:
name: affinity
labels:
app: node-affinity-pod
spec:
containers:
- name: with-node-affinity
image: wangyanglinux/myapp:v1
affinity:
nodeAffinity:
requiredDuringSchedulingIgnoredDuringExecution:
nodeSelectorTerms:
- matchExpressions:
- key: kubernetes.io/hostname
operator: NotIn
values:
- node02
preferredDuringSchedulingIgnoredDuringExecution
apiVersion: v1
kind: Pod
metadata:
name: affinity
labels:
app: node-affinity-pod
spec:
containers:
- name: with-node-affinity
image: wangyanglinux/myapp:v1
affinity:
nodeAffinity:
preferredDuringSchedulingIgnoredDuringExecution:
- weight: 1
preference:
matchExpressions:
- key: kubernetes.io/hostname
operator: In
values:
- node3
先硬后软
apiVersion: v1
kind: Pod
metadata:
name: affinity
labels:
app: node-affinity-pod
spec:
containers:
- name: with-node-affinity
image: hub.atguigu.com/library/myapp:v1
affinity:
nodeAffinity:
requiredDuringSchedulingIgnoredDuringExecution:
nodeSelectorTerms:
- matchExpressions:
- key: kubernetes.io/hostname
operator: NotIn
values:
- k8s-node02
preferredDuringSchedulingIgnoredDuringExecution:
- weight: 1
preference:
matchExpressions:
- key: source
operator: In
values:
- qikqiak
键值运算关系
- In:label 的值在某个列表中
- NotIn:label 的值不在某个列表中
- Gt:label 的值大于某个值
- Lt:label 的值小于某个值
- Exists:某个 label 存在
- DoesNotExist:某个 label 不存在
Pod 亲和性
pod.spec.affinity.podAffinity/podAntiAffinity
- preferredDuringSchedulingIgnoredDuringExecution:软策略
- requiredDuringSchedulingIgnoredDuringExecution:硬策略
apiVersion: v1
kind: Pod
metadata:
name: pod-3
labels:
app: pod-3
spec:
containers:
- name: pod-3
image: wangyanglinux/myapp:v1
affinity:
podAffinity:
requiredDuringSchedulingIgnoredDuringExecution:
- labelSelector:
matchExpressions:
- key: app
operator: In
values:
- pod-1
topologyKey: kubernetes.io/hostname
podAntiAffinity:
preferredDuringSchedulingIgnoredDuringExecution:
- weight: 1
podAffinityTerm:
labelSelector:
matchExpressions:
- key: app
operator: In
values:
- pod-2
topologyKey: kubernetes.io/hostname
亲和性/反亲和性调度策略比较如下:
调度策略匹配 标签 | 匹配 标签 | 操作符 | 拓扑域 支持 | 调度目标 |
nodeAffinity | 主机 | In, NotIn, Exists, DoesNotExist, Gt, Lt | 否 | 指向主机 |
podAffinity | POD | In, NotIn, Exists, DoesNotExist | 是 | POD与指定POD同一拓 扑域 |
podAnitAffinity | POD | In, NotIn, Exists, DoesNotExist | 是 | POD与指定POD不在同 一拓扑域 |
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