目录
k8s调度
nodename
nodeselector
nodeaffinity
podaffinity
podantiaffinity
Taints
cordon、drain、delete
k8s调度
nodename
[root@k8s2 node]# vim nodename.yaml
apiVersion: v1
kind: Pod
metadata:
name: nginx
labels:
app: nginx
spec:
containers:
- name: nginx
image: nginx
nodeName: k8s3
[root@k8s2 node]# kubectl apply -f nodename.yaml
[root@k8s2 node]# kubectl delete -f nodename.yamlnodeselector
NodeSelector是Kubernetes中一个用于选择节点的机制。它是一种标签选择器，可以根据选择器定义匹配节点标签，并将Pod调度到这些匹配的节点上
[root@k8s2 node]# vim nodeselector.yaml
apiVersion: v1
kind: Pod
metadata:
name: nginx
spec:
containers:
- name: nginx
image: nginx
imagePullPolicy: IfNotPresent
nodeSelector:
disktype: ssd
[root@k8s2 node]# kubectl label nodes k8s4 disktype=ssd
[root@k8s2 node]# kubectl label nodes k8s3 disktype=ssd
[root@k8s2 node]# kubectl apply -f nodeselector.yaml
[root@k8s2 node]# kubectl delete -f nodeselector.yaml
nodeaffinity
[root@k8s2 node]# vim nodeaffinity.yaml
apiVersion: v1
kind: Pod
metadata:
name: node-affinity
spec:
containers:
- name: nginx
image: nginx
affinity:
nodeAffinity:
requiredDuringSchedulingIgnoredDuringExecution:
nodeSelectorTerms:
- matchExpressions:
- key: disktype
operator: In
values:
- ssd
- fc
preferredDuringSchedulingIgnoredDuringExecution:
- weight: 1
preference:
matchExpressions:
- key: kubernetes.io/hostname
operator: NotIn
values:
- k8s3
[root@k8s2 node]# kubectl apply -f nodeaffinity.yaml
[root@k8s2 node]# kubectl describe pod node-affinity
[root@k8s2 node]# kubectl delete -f nodeaffinity.yaml
podaffinity
[root@k8s2 node]# vim podaffinity.yaml
apiVersion: apps/v1
kind: Deployment
metadata:
name: nginx-deployment
labels:
app: nginx
spec:
replicas: 3
selector:
matchLabels:
app: nginx
template:
metadata:
labels:
app: nginx
spec:
containers:
- name: nginx
image: nginx
affinity:
podAffinity:
requiredDuringSchedulingIgnoredDuringExecution:
- labelSelector:
matchExpressions:
- key: app
operator: In
values:
- nginx
topologyKey: "kubernetes.io/hostname"
[root@k8s2 node]# kubectl apply -f podaffinity.yaml
[root@k8s2 node]# kubectl delete -f podaffinity.yaml
podantiaffinity
[root@k8s2 node]# vim podantiaffinity.yaml
apiVersion: apps/v1
kind: Deployment
metadata:
name: nginx-deployment
labels:
app: nginx
spec:
replicas: 3
selector:
matchLabels:
app: nginx
template:
metadata:
labels:
app: nginx
spec:
containers:
- name: nginx
image: nginx
affinity:
podAntiAffinity:
requiredDuringSchedulingIgnoredDuringExecution:
- labelSelector:
matchExpressions:
- key: app
operator: In
values:
- nginx
topologyKey: "kubernetes.io/hostname"
[root@k8s2 node]# kubectl apply -f podantiaffinity.yaml
[root@k8s2 node]# kubectl delete -f podantiaffinity.yaml
Taints
[root@k8s2 node]# vim taint.yaml
apiVersion: apps/v1
kind: Deployment
metadata:
labels:
app: web
name: web
spec:
replicas: 3
selector:
matchLabels:
app: web
template:
metadata:
labels:
app: web
spec:
containers:
- image: nginx
name: nginx
[root@k8s2 node]# kubectl apply -f taint.yaml
设置taint
root@k8s2 pod]# kubectl taint node k8s3 k1=v1:NoSchedule
[root@k8s2 pod]# kubectl describe nodes k8s3 |grep Tain
[root@k8s2 pod]# kubectl scale deployment web --replicas 6
[root@k8s2 pod]# kubectl taint node k8s3 k1=v1:NoExecute
[root@k8s2 pod]# kubectl describe nodes k8s3 |grep Tain
设置 tolerations
[root@k8s2 node]# vim taint.yaml
apiVersion: apps/v1
kind: Deployment
metadata:
labels:
app: web
name: web
spec:
replicas: 6
selector:
matchLabels:
app: web
template:
metadata:
labels:
app: web
spec:
tolerations:
- operator: Exists
effect: NoSchedule
containers:
- image: nginx
name: nginx
[root@k8s2 node]# kubectl apply -f taint.yaml
容忍所有taints
[root@k8s2 node]# vim taint.yaml
apiVersion: apps/v1
kind: Deployment
metadata:
labels:
app: web
name: web
spec:
replicas: 6
selector:
matchLabels:
app: web
template:
metadata:
labels:
app: web
spec:
tolerations:
- operator: Exists
containers:
- image: nginx
name: nginx
[root@k8s2 node]# kubectl apply -f taint.yaml
回收、删除taints
[root@k8s2 node]# kubectl delete -f taint.yaml
[root@k8s2 node]# kubectl taint node k8s3 k1-
cordon、drain、delete
[root@k8s2 node]# kubectl create deployment demo --image nginx --replicas 3
[root@k8s2 node]# kubectl cordon k8s3
[root@k8s2 node]# kubectl get node
[root@k8s2 node]# kubectl scale deployment demo --replicas 6
[root@k8s2 node]# kubectl drain k8s3 --ignore-daemonsets
[root@k8s2 node]# kubectl delete nodes k8s3
[root@k8s2 node]# kubectl get node
k8s3节点重启kubelet服务重新加入集群
[root@k8s3 ~]# systemctl restart kubelet
[root@k8s2 node]# kubectl get node
