kube-state-metrics 组件介绍
github项目地址：https://github.com/kubernetes/kube-state-metrics
Kube-state-metrics: 通过监听 API Server 生成有关资源对象的状态指标，比如 Deployment、Node、Pod，需要注意的是 kube-state-metrics 的使用场景不是用于监控对方是否存活，而是用于周期性获取目标对象的 metrics 指标数据并在 web 界面进行显示或被 prometheus 抓取(如 pod 的状态是 running 还是 Terminating、pod 的创建时间等) ，目前的 kube-state-metrics 收集的指标数据可参见官方的文档 ，https://github.com/kubernetes/kube-state-metrics/tree/master/docs ,并不会存储这些指标数据，所以可以使用 Prometheus 来抓取这些数据然后存储，主要关注的是业务相关的一些元数据，比如 Deployment、Pod、副本状态等，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？目前有多少 job 在运行中。
官方的定义：
kube-state-metrics is a simple service that listens to the Kubernetes API server and generates metrics about the state of the objects.
镜像名称：
将官方镜像替换镜像为阿里云镜像
registry.k8s.io/kube-state-metrics/kube-state-metrics:v2.6.0
registry.cn-hangzhou.aliyuncs.com/liangxiaohui/kuberntes-state-metrics:v2.6.0
部署kube-state-metric
root@master1:~/yaml# cat kube-state-metrics-deploy.yaml
apiVersion: apps/v1
kind: Deployment
metadata:
name: kube-state-metrics
namespace: kube-system
spec:
replicas: 1
selector:
matchLabels:
app: kube-state-metrics
template:
metadata:
labels:
app: kube-state-metrics
spec:
serviceAccountName: kube-state-metrics
containers:
- name: kube-state-metrics
image: registry.cn-hangzhou.aliyuncs.com/liangxiaohui/kuberntes-state-metrics:v2.6.0
ports:
- containerPort: 8080
---
---
apiVersion: v1
kind: ServiceAccount
metadata:
name: kube-state-metrics
namespace: kube-system
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRole
metadata:
name: kube-state-metrics
rules:
- apiGroups: [""]
resources: ["nodes", "pods", "services", "resourcequotas", "replicationcontrollers", "limitranges", "persistentvolumeclaims", "persistentvolumes", "namespaces", "endpoints"]
verbs: ["list", "watch"]
- apiGroups: ["extensions"]
resources: ["daemonsets", "deployments", "replicasets"]
verbs: ["list", "watch"]
- apiGroups: ["apps"]
resources: ["statefulsets"]
verbs: ["list", "watch"]
- apiGroups: ["batch"]
resources: ["cronjobs", "jobs"]
verbs: ["list", "watch"]
- apiGroups: ["autoscaling"]
resources: ["horizontalpodautoscalers"]
verbs: ["list", "watch"]
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRoleBinding
metadata:
name: kube-state-metrics
roleRef:
apiGroup: rbac.authorization.k8s.io
kind: ClusterRole
name: kube-state-metrics
subjects:
- kind: ServiceAccount
name: kube-state-metrics
namespace: kube-system
---
apiVersion: v1
kind: Service
metadata:
annotations:
prometheus.io/scrape: 'true'
name: kube-state-metrics
namespace: kube-system
labels:
app: kube-state-metrics
spec:
type: NodePort
ports:
- name: kube-state-metrics
port: 8080
targetPort: 8080
nodePort: 31666
protocol: TCP
selector:
app: kube-state-metrics
验证状态
root@master1:~/yaml\# kubectl get pods -n kube-system |grep kube-state-metrics
kube-state-metrics-55c776795d-chvg8 1/1 Running 0 3m31s
k8s内置prometheus-server配置采集指标
root@master1:~/yaml# vim prometheus-cfg.yml
- job_name: "kube-state-metrics"
static_configs:
- targets: ["192.168.100.3:31666"]
root@master1:~/yaml# kubectl apply -f prometheus-cfg.yaml
root@master1:~/yaml# kubectl delete pods prometheus-server-84c8755ccc-tgwm6 #重启pod浏览器访问验证
grafana导入dashboard模板
ID：13824
master和node节点数量的指标修改
count(node_load1{kubernetes_io_role="master"})
count(node_load1{kubernetes_io_role="node"})
ID：14518
