节点亲和性
-
亲和性都是根据 label 来匹配的
requiredDuringSchedulingIgnoredDuringExecution：硬亲和性，类似于nodeSelectorpreferredDuringSchedulingIgnoredDuringExecution：软亲和性operator：In、NotIn、Exists、DoesNotExist、Gt和Ltweight：取值范围 [1,100]
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
apiVersion: apps/v1
kind: Deployment
metadata:
name: deploy-node-affinity-test
spec:
replicas: 3
selector:
matchLabels:
app: node-affinity-test
template:
metadata:
labels:
app: node-affinity-test
spec:
affinity: # 亲和性
nodeAffinity: # 节点亲和性
requiredDuringSchedulingIgnoredDuringExecution:
nodeSelectorTerms:
- matchExpressions:
- key: kubernetes.io/os
operator: In
values:
- linux
preferredDuringSchedulingIgnoredDuringExecution:
- weight: 10
preference:
matchExpressions:
- key: label-1
operator: In
values:
- value-1
- weight: 50
preference:
matchExpressions:
- key: label-2
operator: In
values:
- value-2
containers:
- image: nginx:1.7.9
imagePullPolicy: IfNotPresent
name: deploy-node-affinity-test-c
Pod 亲和性
topologyKey：- 顾名思义，
topology就是拓扑的意思，这里指的是一个拓扑域，是指一个范围的概念，比如一个 Node、一个机柜、一个机房或者是一个地区（如杭州、上海）等，实际上对应的还是 Node 上的标签。 - 这里的
topologyKey对应的是 Node 上的标签的 Key（不关注 Value），可以看出，其实topologyKey就是用于筛选 Node 的。
- 顾名思义，
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
apiVersion: apps/v1
kind: Deployment
metadata:
name: deploy-pod-affinity-test
spec:
replicas: 3
selector:
matchLabels:
app: pod-affinity-test
template:
metadata:
labels:
app: pod-affinity-test
spec:
affinity: # 亲和性
podAffinity: # Pod 亲和性
preferredDuringSchedulingIgnoredDuringExecution: # 软亲和性
- weight: 100
podAffinityTerm:
labelSelector:
matchExpressions:
- key: security # 如果某个节点已存在具有 security=S1 的标签的 Pod 时，尽量将本 Pod 调度到该节点
operator: In
values:
- S1
topologyKey: gz.fdr.kubernetes.io/zone # 尽量调度到具有 key 为 `gz.fdr.kubernetes.io/zone` 的标签的节点上
podAntiAffinity: # Pod 反亲和性
requiredDuringSchedulingIgnoredDuringExecution: # 硬亲和性
- labelSelector:
matchExpressions:
- key: security # 如果某个节点已存在具有 security=S2 的标签的 Pod 时，一定不要将本 Pod 调度到该节点
operator: In
values:
- S2
topologyKey: sh.fdr.kubernetes.io/zone # 一定不要调度到具有 key 为 `sh.fdr.kubernetes.io/zone` 的标签的节点上
containers:
- image: nginx:1.7.9
imagePullPolicy: IfNotPresent
name: deploy-pod-affinity-test-c
