k8s-daemonSet控制器
DaemonSet 确保全部(或者某些)节点上运行一个 Pod 的副本。 当有节点加入集群时, 也会为他们新增一个 Pod 。 当有节点从集群移除时,这些 Pod 也会被回收。删除 DaemonSet 将会删除它创建的所有 Pod。
DaemonSet 的一些典型用法:
1.在每个节点上运行集群守护进程
2.在每个节点上运行日志收集守护进程
3.在每个节点上运行监控守护进程
查看控制器
[root@master ~]# kubectl -n kube-system get daemonsets.apps
NAME DESIRED CURRENT READY UP-TO-DATE AVAILABLE NODE SELECTOR AGE
kube-flannel-ds-amd64 2 2 2 2 2 <none> 18h
kube-proxy 2 2 2 2 2 beta.kubernetes.io/os=linux 18h
创建控制器
---
apiVersion: apps/v1
kind: DaemonSet
metadata:name: my-daemonset
spec:selector:matchLabels:app: dae1template:metadata:labels:app: dae1spec:containers:- name: my-pod-daeimage: 192.168.84.11/k8s/music:v3ports:- protocol: TCPcontainerPort: 80
[root@master controllers]# kubectl get daemonsets.apps -o wide
NAME DESIRED CURRENT READY UP-TO-DATE AVAILABLE NODE SELECTOR AGE CONTAINERS IMAGES SELECTOR
my-daemonset 1 1 1 1 1 <none> 50s my-pod-dae 192.168.84.11/k8s/music:v3 app=dae1
[root@master controllers]# kubectl get pod -o wide
NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES
my-daemonset-l2twf 1/1 Running 0 2m2s 10.244.1.23 node01.local <none> <none>
daemonSet控制器的调度策略-pod在那些节点运行-默认master不运行
1、污点容忍度影响了daemonSet控制器的调度:下面查看一下节点的污点容忍度
[root@master controllers]# kubectl describe nodes |grep Taints
Taints: node-role.kubernetes.io/master:NoSchedule
Taints: <none>
master节点的污点容忍度是NoSchedule,所以pod不在上面运行
>容忍度说明:
>NoSchedule: 不会被调度
>NoExecute:
>PremerNoSchedule:
daemonSet控制器的调度策略-pod在那些节点运行-默认master不运行
2、设置污点容忍度
[root@master controllers]# kubectl taint node node01.local key=value:NoSchedule
node/node01.local tainted
[root@master controllers]# kubectl describe nodes |grep Taints
Taints: node-role.kubernetes.io/master:NoSchedule
Taints: key=value:NoSchedule
daemonSet控制器的调度策略-pod在那些节点运行-默认master不运行
2、删除污点
[root@master controllers]# kubectl taint node node01.local key-
node/node01.local untainted
[root@master controllers]# kubectl describe nodes |grep Taints
Taints: node-role.kubernetes.io/master:NoSchedule
Taints: <none>
daemonSet控制器的调度策略-pod在那些节点运行-默认master不运行
3、无视污点
apiVersion: apps/v1
kind: DaemonSet
metadata:name: fluentd-elasticsearchlabels:k8s-app: fluentd-logging
spec:selector:matchLabels:name: fluentd-elasticsearchtemplate:metadata:labels:name: fluentd-elasticsearchspec:tolerations:# 这些容忍度设置是为了让该守护进程集在控制平面节点上运行# 如果你不希望自己的控制平面节点运行 Pod,可以删除它们- key: node-role.kubernetes.io/control-planeoperator: Existseffect: NoSchedule- key: node-role.kubernetes.io/masteroperator: Existseffect: NoSchedulecontainers:- name: fluentd-elasticsearchimage: quay.io/fluentd_elasticsearch/fluentd:v2.5.2