工作负载 Daemonset - nicoleShuaihui/k8s GitHub Wiki
Daemonset类应用会在集群所有节点上各运行1个pod（除非有其他调度限制）。
因其特点，Daemonset适用于部署如下类型应用：
- 采集类Agent，包括Flume、Fluented等。
- 运维监控类，包括Pormetheus Node-Exporter等。
- K8s自身组件，kube-proxy、K8s虚拟网络（如flannel、calico-node）、Cloud-controller-manager等。
创建Daemonset
apiVersion: extensions/v1beta1
kind: DaemonSet
metadata:
labels:
app: node-exporter
project: k8s-playground
name: node-exporter
namespace: pg-allen #修改为自己环境
spec: # 没有replicas
minReadySeconds: 30
revisionHistoryLimit: 10
selector:
matchLabels:
app: node-exporter
template:
metadata:
annotations:
cluster-autoscaler.kubernetes.io/safe-to-evict: "true"
creationTimestamp: null
labels:
app: node-exporter
project: k8s-playground
spec:
automountServiceAccountToken: false
containers:
- env:
- name: web_listen_address
value: "19100" #修改为自己端口
image: 172.30.10.185:15000/common/prometheus-node-exporter:2020041501
imagePullPolicy: Always
livenessProbe:
failureThreshold: 3
initialDelaySeconds: 168
periodSeconds: 20
successThreshold: 1
tcpSocket:
port: 19100 #修改为自己端口
timeoutSeconds: 1
name: node-exporter
readinessProbe:
failureThreshold: 3
initialDelaySeconds: 11
periodSeconds: 20
successThreshold: 1
tcpSocket:
port: 19100 #修改为自己端口
timeoutSeconds: 1
resources:
limits:
cpu: 400m
memory: 256Mi
requests:
cpu: 50m
memory: 50Mi
volumeMounts: # 通常以hostsPath方式挂载宿主机目录
- mountPath: /host/proc
name: volume0
- mountPath: /host/sys
name: volume1
dnsPolicy: Default
hostNetwork: true
restartPolicy: Always
volumes:
- hostPath:
path: /proc
type: ""
name: volume0
- hostPath:
path: /sys
type: ""
name: volume1
templateGeneration: 1
updateStrategy: # 滚动升级策略
rollingUpdate:
maxUnavailable: 10 # maxUnavailable必须大于0
type: RollingUpdate
访问：
# curl http://172.30.10.122:19100/metrics
... ...
查看：
# kubectl describe ds node-exporter -n pg-allen
... ...
# kubectl get ds node-exporter -n pg-allen
NAME DESIRED CURRENT READY UP-TO-DATE AVAILABLE NODE SELECTOR AGE
node-exporter 55 55 54 55 54 <none> 2m48s
# kubectl get po -n pg-allen
... ...
删除daemonset：
# kubectl delete ds node-exporter -n pg-allen
daemonset.extensions "node-exporter" deleted