Kubernetes K8S之资源控制器Daemonset详解

Kubernetes的资源控制器Daemonset详解与示例

主机配置规划 服务器名称(hostname) 系统版本 配置 内网IP 外网IP(模拟) k8s-master CentOS7.7 2C/4G/20G 172.16.1.110 10.0.0.110 k8s-node01 CentOS7.7 2C/4G/20G 172.16.1.111 10.0.0.111 k8s-node02 CentOS7.7 2C/4G/20G 172.16.1.112 10.0.0.112

什么是控制器 kubernetes中内建了很多controller（控制器），这些相当于一个状态机，用来控制pod的具体状态和行为。

部分控制器类型如下： ReplicationController 和 ReplicaSet Deployment DaemonSet StatefulSet Job/CronJob HorizontalPodAutoscaler

DaemonSet 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，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： 在每个节点上运行集群存储 DaemonSet，例如 glusterd、ceph。 在每个节点上运行日志收集 DaemonSet，例如 fluentd、logstash。 在每个节点上运行监控 DaemonSet，例如 Prometheus Node Exporter、Flowmill、Sysdig 代理、collectd、Dynatrace OneAgent、AppDynamics 代理、Datadog 代理、New Relic 代理、Ganglia gmond 或者 Instana 代理。 一个简单的用法是在所有的节点上都启动一个 DaemonSet，并作为每种类型的 daemon 使用。

一个稍微复杂的用法是单独对每种 daemon 类型使用一种DaemonSet。这样有多个 DaemonSet，但具有不同的标识，并且对不同硬件类型具有不同的内存、CPU 要求。

备注：DaemonSet 中的 Pod 可以使用 hostPort，从而可以通过节点 IP 访问到 Pod；因为DaemonSet模式下Pod不会被调度到其他节点。使用示例如下：

复制代码 1 ports: 2 - name: httpd 3 containerPort: 80 4 #除非绝对必要，否则不要为 Pod 指定 hostPort。 将 Pod 绑定到hostPort时，它会限制 Pod 可以调度的位置数；DaemonSet除外 5 #一般情况下 containerPort与hostPort值相同 6 hostPort: 8090 #可以通过宿主机+hostPort的方式访问该Pod。例如：pod在/调度到了k8s-node02【172.16.1.112】，那么该Pod可以通过172.16.1.112:8090方式进行访问。 7 protocol: TCP 复制代码

可参见：「Kubernetes K8S之通过yaml创建pod与pod文件常用字段详解」

DaemonSet示例 yaml文件

复制代码 1 [root@k8s-master controller]# pwd 2 /root/k8s_practice/controller 3 [root@k8s-master controller]# cat daemonset.yaml 4 apiVersion: apps/v1 5 kind: DaemonSet 6 metadata: 7 name: fluentd-elasticsearch 8 namespace: default 9 labels: 10 k8s-app: fluentd-logging 11 spec: 12 selector: 13 matchLabels: 14 name: fluentd-elasticsearch 15 template: 16 metadata: 17 labels: 18 name: fluentd-elasticsearch 19 spec: 20 tolerations: 21 # 允许在master节点运行 22 - key: node-role.kubernetes.io/master 23 effect: NoSchedule 24 containers: 25 - name: fluentd-elasticsearch 26 image: registry.cn-beijing.aliyuncs.com/google_registry/fluentd:v2.5.2 27 resources: 28 limits: 29 cpu: 1 30 memory: 200Mi 31 requests: 32 cpu: 100m 33 memory: 200Mi 34 volumeMounts: 35 - name: varlog 36 mountPath: /var/log 37 - name: varlibdockercontainers 38 mountPath: /var/lib/docker/containers 39 readOnly: true 40 # 优雅关闭应用，时间设置。超过该时间会强制关闭【可选项】，默认30秒 41 terminationGracePeriodSeconds: 30 42 volumes: 43 - name: varlog 44 hostPath: 45 path: /var/log 46 - name: varlibdockercontainers 47 hostPath: 48 path: /var/lib/docker/containers 复制代码

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运行daemonset，并查看状态

复制代码 1 [root@k8s-master controller]# kubectl apply -f daemonset.yaml 2 daemonset.apps/fluentd-elasticsearch created 3 [root@k8s-master controller]# 4 [root@k8s-master controller]# kubectl get daemonset -o wide 5 NAME DESIRED CURRENT READY UP-TO-DATE AVAILABLE NODE SELECTOR AGE CONTAINERS IMAGES SELECTOR 6 fluentd-elasticsearch 3 3 3 3 3 92s fluentd-elasticsearch registry.cn-beijing.aliyuncs.com/google_registry/fluentd:v2.5.2 name=fluentd-elasticsearch 7 [root@k8s-master controller]# 8 [root@k8s-master controller]# kubectl get pod -o wide 9 NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES 10 fluentd-elasticsearch-52b8z 1/1 Running 0 95s 10.244.2.92 k8s-node02 11 fluentd-elasticsearch-fps95 1/1 Running 0 95s 10.244.0.46 k8s-master 12 fluentd-elasticsearch-pz8j7 1/1 Running 0 95s 10.244.4.83 k8s-node01 复制代码 由上可见，在k8s集群所有节点包括master节点都运行了daemonset的pod。