配置文件
DaemonSet 用于在 Kubernetes 集群的每个节点上运行一个 Pod 副本，确保每个节点上都有一个 Pod 的副本在运行。
与 Deployment 和 StatefulSet 不同，DaemonSet 不关心副本数量，而是关注集群中的每个节点。
当新节点加入集群时，DaemonSet 会自动在新节点上创建 Pod 副本；当节点从集群中删除时，相应的 Pod 副本也会被删除。
DaemonSet 适用于运行系统级别的守护进程、日志收集器、监控代理等。
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[root@k8s-master1 test]# vim ds-fdr-fluentd.yaml
apiVersion: apps/v1
kind: DaemonSet # 创建 DaemonSet 资源
metadata:
name: ds-fdr-fluentd # DaemonSet 的名字
spec:
selector:
matchLabels:
app: fdr-logs
template:
metadata:
labels:
app: fdr-logs
id: fdr-fluentd
name: ds-fdr-fluentd-po-template
spec:
nodeSelector: # DaemonSet 要部署的 Node
type: fdr-microservices
volumes: # 定义数据卷
- name: ds-fdr-fluentd-volume-containers # 定义的数据卷的名称
hostPath: # 数据卷类型，主机路径的模式，也就是与 Node 共享目录
path: /var/lib/docker/containers # Node 主机中的目录
- name: ds-fdr-fluentd-volume-varlog
hostPath:
path: /var/log
containers:
- name: ds-fdr-fluentd-c-es
image: agilestacks/fluentd-elasticsearch:v1.3.0
env: # 环境变量配置
- name: FLUENTD_ARGS # 环境变量的key
value: -qq # 环境变量的value
volumeMounts: # 加载数据卷，避免数据丢失
- name: ds-fdr-fluentd-volume-containers # 数据卷的名字
mountPath: /var/lib/docker/containers # 将数据卷挂载到的容器内的目录
- name: ds-fdr-fluentd-volume-varlog
mountPath: /var/log
创建
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[root@k8s-master1 test]# kubectl create -f ds-fdr-fluentd.yaml
daemonset.apps/ds-fdr-fluentd created
[root@k8s-master1 test]# kubectl get daemonsets
NAME DESIRED CURRENT READY UP-TO-DATE AVAILABLE NODE SELECTOR AGE
ds-fdr-fluentd 0 0 0 0 0 type=fdr-microservices 40s
[root@k8s-master1 test]# kubectl get ds
NAME DESIRED CURRENT READY UP-TO-DATE AVAILABLE NODE SELECTOR AGE
ds-fdr-fluentd 0 0 0 0 0 type=fdr-microservices 42s
[root@k8s-master1 test]# kubectl get po
No resources found in default namespace.
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[root@k8s-master1 test]# kubectl label no k8s-node1.zhch.lan type=fdr-microservices
node/k8s-node1.zhch.lan labeled
[root@k8s-master1 test]# kubectl get po -o wide
NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES
ds-fdr-fluentd-tdqlh 1/1 Running 0 2m4s 10.244.37.234 k8s-node1.zhch.lan <none> <none>
[root@k8s-master1 test]# kubectl label no k8s-node2.zhch.lan type=fdr-microservices
node/k8s-node2.zhch.lan labeled
[root@k8s-master1 test]# kubectl get po -o wide
NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES
ds-fdr-fluentd-8bcl8 1/1 Running 0 49s 10.244.8.240 k8s-node2.zhch.lan <none> <none>
ds-fdr-fluentd-tdqlh 1/1 Running 0 3m31s 10.244.37.234 k8s-node1.zhch.lan <none> <none>
- 删除标签
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[root@k8s-master1 ~]# kubectl get no --show-labels
NAME STATUS ROLES AGE VERSION LABELS
k8s-master1.zhch.lan Ready control-plane 12d v1.25.14 beta.kubernetes.io/arch=amd64,beta.kubernetes.io/os=linux,kubernetes.io/arch=amd64,kubernetes.io/hostname=k8s-master1.zhch.lan,kubernetes.io/os=linux,node-role.kubernetes.io/control-plane=,node.kubernetes.io/exclude-from-external-load-balancers=
k8s-node1.zhch.lan Ready <none> 12d v1.25.14 beta.kubernetes.io/arch=amd64,beta.kubernetes.io/os=linux,kubernetes.io/arch=amd64,kubernetes.io/hostname=k8s-node1.zhch.lan,kubernetes.io/os=linux,type=fdr-microservices
k8s-node2.zhch.lan Ready <none> 12d v1.25.14 beta.kubernetes.io/arch=amd64,beta.kubernetes.io/os=linux,kubernetes.io/arch=amd64,kubernetes.io/hostname=k8s-node2.zhch.lan,kubernetes.io/os=linux,type=fdr-microservices
[root@k8s-master1 ~]# kubectl label no k8s-node1.zhch.lan type-
node/k8s-node1.zhch.lan unlabeled
[root@k8s-master1 ~]# kubectl label no k8s-node2.zhch.lan type-
node/k8s-node2.zhch.lan unlabeled
[root@k8s-master1 ~]# kubectl get no --show-labels
NAME STATUS ROLES AGE VERSION LABELS
k8s-master1.zhch.lan Ready control-plane 12d v1.25.14 beta.kubernetes.io/arch=amd64,beta.kubernetes.io/os=linux,kubernetes.io/arch=amd64,kubernetes.io/hostname=k8s-master1.zhch.lan,kubernetes.io/os=linux,node-role.kubernetes.io/control-plane=,node.kubernetes.io/exclude-from-external-load-balancers=
k8s-node1.zhch.lan Ready <none> 12d v1.25.14 beta.kubernetes.io/arch=amd64,beta.kubernetes.io/os=linux,kubernetes.io/arch=amd64,kubernetes.io/hostname=k8s-node1.zhch.lan,kubernetes.io/os=linux
k8s-node2.zhch.lan Ready <none> 12d v1.25.14 beta.kubernetes.io/arch=amd64,beta.kubernetes.io/os=linux,kubernetes.io/arch=amd64,kubernetes.io/hostname=k8s-node2.zhch.lan,kubernetes.io/os=linux
