linux怎么查看本机内存大小
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2022-11-22
如何获取采集服务器Kubernetes监控指标
对比
例如:
我调度了多少个Replicas?现在可用的有几个?
多少个Pod是running/stopped/terminated状态?
Pod重启了多少次?
我有多少job在运行中?
这些指标都由kube-state-metrics提供。
之所以没有把kube-state-metrics纳入到metric-server的能力中,是因为他们的关注点本质上是不一样的。
metric-server仅仅是获取、格式化现有数据,写入特定的存储,实质上是一个监控系统。
kube-state-metrics是将Kubernetes的运行状况在内存中做了个快照,并且获取新的指标,但他没有能力导出这些指标。
部署metric-server
拉取metric-server的镜像到本地:
# docker pull zhaoqinchang/metrics-server:0.3.7 0.3.7: Pulling from zhaoqinchang/metrics-server 9ff2acc3204b: Pull complete 9d14b55ff9a0: Pull complete Digest:
sha256:c0efe772bb9e5c289db6cc4bc2002c268507d0226f2a3815f7213e00261c38e9 Status: Downloaded newer image for zhaoqinchang/metrics-server:0.3.7 docker.io/zhaoqinchang/metrics-server:0.3.7
修改components.yaml文件为如下内容:
# cat components.yaml --- apiVersion: rbac.authorization.k8s.io/v1 kind: ClusterRole metadata: name: system:aggregated-metrics-reader labels: rbac.authorization.k8s.io/aggregate-to-view: “true” rbac.authorization.k8s.io/aggregate-to-edit:
“true” rbac.authorization.k8s.io/aggregate-to-admin: “true” rules: - apiGroups: [“metrics.k8s.io”] resources: [“pods”, “nodes”] verbs: [“get”, “list”, “watch”] --- apiVersion: rbac.authorization.k8s.io/v1 kind: ClusterRoleBinding metadata: name: metrics-serverauth-delegator roleRef:
apiGroup: rbac.authorization.k8s.io kind: ClusterRole name: system:auth-delegator subjects: - kind:
ServiceAccount name: metrics-server namespace: kube-system --- apiVersion: rbac.authorization.k8s.io/v1 kind:
RoleBinding metadata: name: metrics-server-auth-reader namespace: kube-system roleRef: apiGroup:
ServiceAccount name: metrics-server namespace: kube-system --- apiVersion:
apiregistration.k8s.io/v1beta1 kind: APIService metadata: name: v1beta1.metrics.k8s.io spec: service: name: metrics-server namespace: kube-system group: metrics.k8s.io version:
v1beta1 insecureSkipTLSVerify: true groupPriorityMinimum: 100 versionPriority: 100 --- apiVersion:
v1 kind: ServiceAccount metadata: name: metrics-server namespace: kube-system --- apiVersion:
apps/v1 kind: Deployment metadata: name: metrics-server namespace: kube-system labels: k8s-app:
tmp-dir emptyDir: {} containers: - name: metrics-server image: zhaoqinchang/metrics-server:0.3.7 #修改镜像为刚刚拉取下来的镜像
imagePullPolicy: IfNotPresent args:
- --cert-dir=/tmp - --secure-port=4443 command: #添加以下三行command命令 - /metrics-server - --kubelet-preferred-address-types=InternalIP - --kubelet-insecure-tls ports: - name: main-port containerPort: 4443 protocol:
“Metrics-server” kubernetes.io/cluster-service: “true” spec: selector: k8s-app: metrics-server ports:
- port: 443 protocol: TCP targetPort: main-port --- apiVersion: rbac.authorization.k8s.io/v1 kind: ClusterRole metadata: name: system:metrics-server rules: - apiGroups: - “” resources: - pods - nodes - nodes/stats - namespaces - configmaps verbs: - get - list - watch --- apiVersion: rbac.authorization.k8s.io/v1 kind: ClusterRoleBinding metadata: name: system:metrics-server roleRef:
apiGroup: rbac.authorization.k8s.io kind: ClusterRole name: system:metrics-server subjects: - kind: ServiceAccount name: metrics-server namespace: kube-system部署metric-server:
# kubectl apply -f components.yaml clusterrole.rbac.authorization.k8s.io/system:aggregated-metrics-reader created clusterrolebinding.rbac.authorization.k8s.io/metrics-serverauth-delegator created
rolebinding.rbac.authorization.k8s.io/metrics-server-auth-reader created
apiservice.apiregistration.k8s.io/v1beta1.metrics.k8s.io created serviceaccount/metrics-server created
deployment.apps/metrics-server created service/metrics-server created
clusterrole.rbac.authorization.k8s.io/system:metrics-server created clusterrolebinding.rbac.authorization.k8s.io/system:metrics-server created
查看metric.k8s.io是否出现在Kubernetes集群的API群组列表中:
# kubectl api-versions | grep metrics metrics.k8s.io/v1beta1
使用
kubectl top命令可显示节点和Pod对象的资源使用信息,它依赖于集群中的资源指标API来收集各项指标数据。它包含有Node和Pod两个子命令,可分别显示Node对象和Pod对象的相关资源占用率。
列出Node资源占用率命令的语法格式为“kubectl top node [-l label | NAME]”,例如下面显示所有节点的资源占用状况的结果中显示了各节点累计CPU资源占用时长及百分比,以及内容空间占用量及占用比例。必要时,也可以在命令直接给出要查看的特定节点的标识,以及使用标签选择器进行节点过滤。
[root@master metric]# kubectl top nodes NAME CPU(cores) CPU% MEMORY(bytes) MEMORY% master 282m 14% 1902Mi 51% node-02 70m 3% 1371Mi 37% node-03 121m 1% 892Mi 11%
而名称空间级别的Pod对象资源占用率的使用方法会略有不同,使用时,一般应该跟定名称空间及使用标签选择器过滤出目标Pod对象。例如,下面显示kube-system名称空间下的Pod资源使用状况:
10Mi kube-flannel-ds-rqlm2 4m 12Mi kube-flannel-ds-v92r9 4m 14Mi kube-proxy-7vjcv 18m 15Mi kube-proxy-xrz8f 13m 21Mi kube-proxy-zpwn6 1m 14Mi kube-scheduler-master 7m 17Mi metrics-server-5549c7694f-7vb66 2m 14Mi
kubectl top命令为用户提供简洁、快速获取Node对象及Pod对象系统资源占用状况的接口,是集群运行和维护的常用命令之一。
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