vim nodename.yaml
apiVersion: v1
kind: Pod
metadata:
name: nginx
labels:
app: nginx
spec:
containers:
- name: nginx
image: nginx
nodeName: k8s2
nodeName: k8s2 #找不到节点pod会出现pending,优先级最高
kubectl apply -f nodename.yaml
kubectl get pod -o wide
回收
kubectl delete -f nodename.yaml
vim nodeselector.yaml
apiVersion: v1
kind: Pod
metadata:
name: nginx
spec:
containers:
- name: nginx
image: nginx
imagePullPolicy: IfNotPresent
nodeSelector:
disktype: ssd
kubectl label nodes k8s4 disktype=ssd
kubectl label nodes k8s3 disktype=ssd
kubectl apply -f nodeselector.yaml
回收
kubectl delete -f nodeselector.yaml
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
kubectl apply -f nodeaffinity.yaml
kubectl describe pod node-affinity
回收
kubectl delete -f nodeaffinity.yaml
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"
kubectl apply -f podaffinity.yaml
kubectl get pod -o wide
回收
kubectl delete -f podaffinity.yaml
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"
kubectl apply -f podantiaffinity.yaml
kubectl get pod -o wide
回收
kubectl delete -f podantiaffinity.yaml
pod反亲和倾向满足
vim poda.yaml
apiVersion: apps/v1
kind: Deployment
metadata:
name: node-affinity
spec:
replicas: 3
selector:
matchLabels:
app: nginx
template:
metadata:
labels:
app: nginx
spec:
tolerations:
- effect: NoSchedule
operator: Exists
- effect: NoExecute
operator: Exists
containers:
- name: nginx
image: nginx
affinity:
podAntiAffinity:
preferredDuringSchedulingIgnoredDuringExecution:
- weight: 100
podAffinityTerm:
labelSelector:
matchExpressions:
- key: app
operator: In
values:
- nginx
topologyKey: kubernetes.io/hostname
nodeAffinity:
requiredDuringSchedulingIgnoredDuringExecution:
nodeSelectorTerms:
- matchExpressions:
- key: disktype
operator: In
values:
- ssd
- sata
kubectl apply -f poda.yaml
kubectl get pod -o wide
回收
kubectl delete -f poda.yaml
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
kubectl apply -f taint.yaml
kubectl get pod -o wide
设置taint
kubectl taint node k8s3 k1=v1:NoSchedule
kubectl describe nodes k8s3 |grep Tain
kubectl scale deployment web --replicas 6
kubectl get pod -o wide
kubectl taint node k8s3 k1=v1:NoExecute
kubectl describe nodes k8s3 |grep Tain
kubectl get pod -o wide
回收
kubectl delete -f taint.yaml
设置 tolerations
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
kubectl apply -f taint.yaml
kubectl get pod -o wide
回收
kubectl delete -f taint.yaml
容忍所有taints
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
kubectl apply -f taint.yaml
kubectl get pod -o wide
回收
kubectl delete -f taint.yaml
删除taints
kubectl taint node k8s3 k1-
kubectl create deployment demo --image nginx --replicas 3
kubectl get pod -o wide
kubectl cordon k8s3
kubectl get node
kubectl scale deployment demo --replicas 6
kubectl get pod -o wide
kubectl drain k8s3 --ignore-daemonsets
kubectl get pod -o wide
kubectl delete nodes k8s3
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