关键词:
文章目录
在自己部署时发现网上很多Prometheus监控K8S的文章都有坑,所以这里结合了几个篇文章总结了下,最后有yaml文件
一、监控方案
- Cadvisor + node-exporter + prometheus + grafana
数据采集 ——> 汇总 ——> 处理、存储 ——> 展示
二、监控流程
-
容器监控:
Prometheus使用cadvisor采集容器监控指标,而
cadvisor集成在K8S的kubelet中所以无需部署
,通过Prometheus进程存储,使用grafana进行展示 -
node节点监控:
node端的监控通过
node_exporter
采集当前主机的资源,通过Prometheus进程存储,最后使用grafana进行展示 -
master节点监控:
master的监控通过
kube-state-metrics
插件从K8S获取到apiserver
的相关数据并通过网页页面暴露出来,然后通过Prometheus进程存储,最后使用grafana进行展示
三、Kubernetes监控指标
- K8S本身的监控指标
- node的资源利用率:监控node节点上的cpu、内存、硬盘等硬件资源
- node的数量:监控node数量与资源利用率、业务负载的比例情况,对成本、资源扩展进行评估
- pod的数量:监控当负载到一定程度时,node与pod的数量。评估负载到哪个阶段,大约需要多少服务器,以及每个pod的资源占用率,然后进行整体评估
- 资源对象状态:在K8S运行过程中,会创建很多pod、控制器、任务等,这些内容都是由K8S中的资源对象进行维护,所以我们可以对资源对象进行监控,获取资源对象的状态
- Pod的监控
- 每个项目中pod的数量:分别监控正常、有问题的pod数量
- 容器资源利用率:统计当前pod的资源利用率,统计pod中的容器资源利用率,结合cpu、网络、内存进行评估
- 应用程序:监控项目中程序的自身情况,例如并发、请求响应等
监控指标 | 具体实现 | 案例 |
---|---|---|
Pod性能 | cadvisor | 容器的CPU、内存利用率 |
Node性能 | node-exporter | node节点的CPU、内存利用率 |
K8S资源对象 | kube-state-metrics | pod、deployment、service |
四、服务发现:
- 从k8s的api中发现抓取的目标,并且始终与k8s集群状态保持一致。动态获取被抓取的目标,实时从api中获取当前状态是否存在
- 自动发现支持的组件
- node:自动发现集群中的node节点
- pod:自动发现运行的容器和端口
- service:自动发现创建的serviceIP、端口
- endpoints:自动发现pod中的容器
- ingress:自动发现创建的访问入口和规则
五、使用Prometheus监控Kubernetes
(1)部署前准备
[root@master ~]# git clone https://github.com/redhatxl/k8s-prometheus-grafana.git #这个仓库的yaml有几个错误,在本文章末尾已经改过来了,可以直接使用末尾的yaml文件
Cloning into 'k8s-prometheus-grafana'...
remote: Enumerating objects: 21, done.
remote: Total 21 (delta 0), reused 0 (delta 0), pack-reused 21
Unpacking objects: 100% (21/21), done.
[root@master ~]# ll
total 24
drwxr-xr-x 5 root root 94 Jul 12 16:07 k8s-prometheus-grafana #克隆的目录
#在所有节点提前下载镜像
[root@master ~]# docker pull prom/node-exporter
[root@master ~]# docker pull prom/prometheus:v2.0.0
[root@master ~]# docker pull grafana/grafana:6.1.4
(2)采用daemonset方式部署node-exporter
[root@master ~]# cd k8s-prometheus-grafana/
[root@master k8s-prometheus-grafana]# ll
total 8
drwxr-xr-x 2 root root 81 Jul 12 16:07 grafana
-rw-r--r-- 1 root root 668 Jul 12 16:07 node-exporter.yaml
drwxr-xr-x 2 root root 106 Jul 12 16:07 prometheus
-rw-r--r-- 1 root root 117 Jul 12 16:07 README.md
[root@master k8s-prometheus-grafana]# cat node-exporter.yaml
---
apiVersion: apps/v1
kind: DaemonSet
metadata:
name: node-exporter
namespace: kube-system
labels:
k8s-app: node-exporter
spec:
selector:
matchLabels:
k8s-app: node-exporter
template:
metadata:
labels:
k8s-app: node-exporter
spec:
containers:
- image: prom/node-exporter
name: node-exporter
ports:
- containerPort: 9100
protocol: TCP
name: http
---
apiVersion: v1
kind: Service
metadata:
labels:
k8s-app: node-exporter
name: node-exporter
namespace: kube-system
spec:
ports:
- name: http
port: 9100
nodePort: 31672
protocol: TCP
type: NodePort
selector:
k8s-app: node-exporter
[root@master k8s-prometheus-grafana]# kubectl apply -f node-exporter.yaml
daemonset.apps/node-exporter created
service/node-exporter created
[root@master k8s-prometheus-grafana]# kubectl get pods -A
NAMESPACE NAME READY STATUS RESTARTS AGE
default recycler-for-prometheus-data 0/1 ContainerCreating 0 5m42s
kube-system coredns-7ff77c879f-m986g 1/1 Running 0 29h
kube-system coredns-7ff77c879f-xhknw 1/1 Running 0 29h
kube-system etcd-master 1/1 Running 0 29h
kube-system kube-apiserver-master 1/1 Running 0 29h
kube-system kube-controller-manager-master 1/1 Running 2 29h
kube-system kube-flannel-ds-ln5f6 1/1 Running 0 26h
kube-system kube-flannel-ds-zhq42 1/1 Running 0 29h
kube-system kube-proxy-9bssw 1/1 Running 0 26h
kube-system kube-proxy-wcdzk 1/1 Running 0 29h
kube-system kube-scheduler-master 1/1 Running 3 29h
kube-system node-exporter-bnkm8 1/1 Running 0 2m19s #这就是新创建的
[root@master k8s-prometheus-grafana]# kubectl get daemonset -A
NAMESPACE NAME DESIRED CURRENT READY UP-TO-DATE AVAILABLE NODE SELECTOR AGE
kube-system kube-flannel-ds 2 2 2 2 2 <none> 29h
kube-system kube-proxy 2 2 2 2 2 kubernetes.io/os=linux 29h
kube-system node-exporter 1 1 1 1 1 <none> 2m23s #这个是新的daemonset
[root@master k8s-prometheus-grafana]# kubectl get service -A
NAMESPACE NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
default kubernetes ClusterIP 172.16.0.1 <none> 443/TCP 29h
kube-system kube-dns ClusterIP 172.16.0.10 <none> 53/UDP,53/TCP,9153/TCP 29h
kube-system node-exporter NodePort 172.16.201.35 <none> 9100:31672/TCP 2m29s #这是新的service
(3)部署Prometheus
[root@master k8s-prometheus-grafana]# cd prometheus/
[root@master prometheus]# ll
total 20
-rw-r--r-- 1 root root 5631 Jul 12 16:07 configmap.yaml
-rw-r--r-- 1 root root 1119 Jul 12 16:07 prometheus.deploy.yml
-rw-r--r-- 1 root root 237 Jul 12 16:07 prometheus.svc.yml
-rw-r--r-- 1 root root 716 Jul 12 16:07 rbac-setup.yaml
[root@master prometheus]# kubectl apply -f rbac-setup.yaml
clusterrole.rbac.authorization.k8s.io/prometheus configured
serviceaccount/prometheus configured
clusterrolebinding.rbac.authorization.k8s.io/prometheus configured
[root@master prometheus]# kubectl apply -f configmap.yaml
configmap/prometheus-config configured
[root@master prometheus]# kubectl apply -f prometheus.deploy.yml
deployment.apps/prometheus created
[root@master prometheus]# kubectl apply -f prometheus.svc.yml
service/prometheus created
(4)部署grafana
[root@master prometheus]# cd ../grafana/
[root@master grafana]# ll
total 12
-rw-r--r-- 1 root root 1449 Jul 12 16:07 grafana-deploy.yaml
-rw-r--r-- 1 root root 256 Jul 12 16:07 grafana-ing.yaml
-rw-r--r-- 1 root root 225 Jul 12 16:07 grafana-svc.yaml
[root@master grafana]# kubectl apply -f grafana-deploy.yaml
deployment.apps/grafana-core created
[root@master grafana]# kubectl apply -f grafana-svc.yaml
service/grafana created
[root@master grafana]# kubectl apply -f grafana-ing.yaml
ingress.extensions/grafana created
(5)检查、测试
[root@master grafana]# kubectl get pods -A
NAMESPACE NAME READY STATUS RESTARTS AGE
default recycler-for-prometheus-data 0/1 ContainerCreating 0 2m7s
kube-system coredns-7ff77c879f-m986g 1/1 Running 0 30h
kube-system coredns-7ff77c879f-xhknw 1/1 Running 0 30h
kube-system etcd-master 1/1 Running 0 30h
kube-system grafana-core-768b6bf79c-wcmk9 1/1 Running 0 2m48s
kube-system kube-apiserver-master 1/1 Running 0 30h
kube-system kube-controller-manager-master 1/1 Running 2 30h
kube-system kube-flannel-ds-ln5f6 1/1 Running 0 26h
kube-system kube-flannel-ds-zhq42 1/1 Running 0 29h
kube-system kube-proxy-9bssw 1/1 Running 0 26h
kube-system kube-proxy-wcdzk 1/1 Running 0 30h
kube-system kube-scheduler-master 1/1 Running 3 30h
kube-system node-exporter-bnkm8 1/1 Running 0 18m
kube-system prometheus-7486bf7f4b-f8k6x 1/1 Running 0 7m12s
[root@master grafana]# kubectl get svc -A
NAMESPACE NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
default kubernetes ClusterIP 172.16.0.1 <none> 443/TCP 30h
kube-system grafana NodePort 172.16.198.56 <none> 3000:30931/TCP 5m15s #grafana端口30931
kube-system kube-dns ClusterIP 172.16.0.10 <none> 53/UDP,53/TCP,9153/TCP 30h
kube-system node-exporter NodePort 172.16.201.35 <none> 9100:31672/TCP 22m #node-exporter端口31672
kube-system prometheus NodePort 172.16.176.125 <none> 9090:30003/TCP 9m12s #prometheus端口30003
- 访问
http://10.10.11.202:31672/metrics
,这是node-exporter采集的数据
-
访问
http://10.10.11.202:30003
,这是Prometheus的页面,依次点击Status——Targets
可以看到已经成功连接到k8s的apiserver
-
访问
http://10.10.11.202:30931
,这是grafana的页面,账户、密码都是admin
(6)grafana添加数据源、导入模板
- 添加数据源,点击add,点击Prometheus
- 依次进行设置,这里的URL需要注意:
URL需要写成,service.namespace:port 的格式,例如:
[root@master grafana]# kubectl get svc -A NAMESPACE NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE default kubernetes ClusterIP 172.16.0.1 <none> 443/TCP 46h kube-system grafana NodePort 172.16.195.186 <none> 3000:30931/TCP 4m16s kube-system kube-dns ClusterIP 172.16.0.10 <none> 53/UDP,53/TCP,9153/TCP 46h kube-system node-exporter NodePort 172.16.201.35 <none> 9100:31672/TCP 17h kube-system prometheus NodePort 172.16.176.125 <none> 9090:30003/TCP 16h #以这里为例,namespace是kube-system,service是prometheus,pod端口是9090,那么最后的URL就是; http://prometheus.kube-system:9090
- 把K8S的Dashboard的模板导入
- 这里导入315模板等待一会会跳转,或者可以下载好json文件,然后复制到下面的文本框中,点击load
-
name自定义,uid可以为空,会自己生成,然后选择数据源,选择刚才创建的
Prometheus
,最后点击import
-
最后,这是效果图
六、yaml文件内容
(1)node-exporter.yaml
---
apiVersion: apps/v1
kind: DaemonSet
metadata:
name: node-exporter
namespace: kube-system
labels:
k8s-app: node-exporter
spec:
selector:
matchLabels:
k8s-app: node-exporter
template:
metadata:
labels:
k8s-app: node-exporter
spec:
containers:
- image: prom/node-exporter
name: node-exporter
ports:
- containerPort: 9100
protocol: TCP
name: http
---
apiVersion: v1
kind: Service
metadata:
labels:
k8s-app: node-exporter
name: node-exporter
namespace: kube-system
spec:
ports:
- name: http
port: 9100
nodePort: 31672
protocol: TCP
type: NodePort
selector:
k8s-app: node-exporter
(2)rbac-setup.yaml
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRole
metadata:
name: prometheus
rules:
- apiGroups: [""]
resources:
- nodes
- nodes/proxy
- services
- endpoints
- pods
verbs: ["get", "list", "watch"]
- apiGroups:
- extensions
resources:
- ingresses
verbs: ["get", "list", "watch"]
- nonResourceURLs: ["/metrics"]
verbs: ["get"]
---
apiVersion: v1
kind: ServiceAccount
metadata:
name: prometheus
namespace: kube-system
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRoleBinding
metadata:
name: prometheus
roleRef:
apiGroup: rbac.authorization.k8s.io
kind: ClusterRole
name: prometheus
subjects:
- kind: ServiceAccount
name: prometheus
namespace: kube-system
(3)configmap.yaml
apiVersion: rbac.authorization.k8s.io/v1 kind: ClusterRole metadata: name: prometheus rules: - apiGroups: [""] resources: - nodes - nodes/proxy - services - endpoints - pods verbs: ["get", "list", "watch"] - apiGroups: - extensions resources: - ingresses verbs: ["get", "list", "watch"] - nonResourceURLs: ["/metrics"] verbs: ["get"] --- apiVersion: v1 kind: ServiceAccount metadata: name: prometheus namespace: kube-system --- apiVersion: rbac.authorization.k8s.io/v1 kind: ClusterRoleBinding metadata: name: prometheus roleRef: apiGroup: rbac.authorization.k8s.io kind: ClusterRole name: prometheus subjects: - kind: ServiceAccount name: prometheus namespace: kube-system [root@master prometheus]# [root@master prometheus]# cat configmap.yaml apiVersion: v1 kind: ConfigMap metadata: name: prometheus-config namespace: kube-system data: prometheus.yml: | global: scrape_interval: 15s evaluation_interval: 15s scrape_configs: - job_name: 'kubernetes-apiservers' kubernetes_sd_configs: - role: endpoints scheme: https tls_config: ca_file: /var/run/secrets/kubernetes.io/serviceaccount/ca.crt bearer_token_file: /var/run/secrets/kubernetes.io/serviceaccount/token relabel_configs: - source_labels: [__meta_kubernetes_namespace, __meta_kubernetes_service_name, __meta_kubernetes_endpoint_port_name] action: keep regex: default;kubernetes;https - job_name: 'kubernetes-nodes' kubernetes_sd_configs: - role: node scheme: https tls_config: ca_file: /var/run/secrets/kubernetes.io/serviceaccount/ca.crt bearer_token_file: /var/run/secrets/kubernetes.io/serviceaccount/token relabel_configs: - action: labelmap regex: __meta_kubernetes_node_label_(.+) - target_label: __address__ replacement: kubernetes.default.svc:443 - source_labels: [__meta_kubernetes_node_name] regex: (.+) target_label: __metrics_path__ replacement: /api/v1/nodes/$1/proxy/metrics - job_name: 'kubernetes-cadvisor' kubernetes_sd_configs: - role: node scheme: https tls_config: ca_file: /var/run/secrets/kubernetes.io/serviceaccount/ca.crt bearer_token_file: /var/run/secrets/kubernetes.io/serviceaccount/token relabel_configs: - action: labelmap regex: __meta_kubernetes_node_label_(.+) - target_label: __address__ replacement: kubernetes.default.svc:443 - source_labels: [__meta_kubernetes_node_name] regex: (.+) target_label: __metrics_path__ replacement: /api/v1/nodes/$1/proxy/metrics/cadvisor - job_name: 'kubernetes-service-endpoints' kubernetes_sd_configs: - role: endpoints relabel_configs: - source_labels: [__meta_kubernetes_service_annotation_prometheus_io_scrape] action: keep regex: true - source_labels: [__meta_kubernetes_service_annotation_prometheus_io_scheme] action: replace target_label: __scheme__ regex: (https?) - source_labels: [__meta_kubernetes_service_annotation_prometheus_io_path] action: replace target_label: __metrics_path__ regex: (.+) - source_labels: [__address__, __meta_kubernetes_service_annotation_prometheus_io_port] action: replace target_label: __address__ regex: ([^:]+)(?::\\d+)?;(\\d+) replacement: $1:$2 - action: labelmap regex: __meta_kubernetes_service_label_(.+) - source_labels: [__meta_kubernetes_namespace] action: replace target_label: kubernetes_namespace - source_labels: [__meta_kubernetes_service_name] action: replace target_label: kubernetes_name - job_name: 'kubernetes-services' kubernetes_sd_configs: - role: service metrics_path: /probe params: module: [http_2xx] relabel_configs: - source_labels: [__meta_kubernetes_service_annotation_prometheus_io_probe] action: keep regex: true - source_labels: [__address__] target_label: __param_target - target_label: __address__ replacement: blackbox-exporter.example.com:9115 - source_labels: [__param_target] target_label: instance - action: labelmap regex: __meta_kubernetes_service_label_(.+) - source_labels: [__meta_kubernetes_namespace] target_label: kubernetes_namespace - source_labels: [__meta_kubernetes_service_name] target_label: kubernetes_name - job_name: 'kubernetes-ingresses' kubernetes_sd_configs: - role: ingress relabel_configs: - source_labels: [__meta_kubernetes_ingress_annotation_prometheus_io_probe] action: keep regex: true - source_labels: [__meta_kubernetes_ingress_scheme,__address__,__meta_kubernetes_ingress_path] regex: (.+);(.+);(.+) replacement: $1://$2$3 target_label: __param_target - target_label: __address__ replacement: blackbox-exporter.example.com:9115 - source_labels: [__param_target] target_label: instance - action: labelmap regex: __meta_kubernetes_ingress_label_(.+) - source_labels: [__meta_kubernetes_namespace] target_label: kubernetes_namespace - source_labels: [__meta_kubernetes_ingress_name] target_label: kubernetes_name - job_name: 'kubernetes-pods' kubernetes_sd_configs: - role: pod relabel_configs: - source_labels: [__meta_kubernetes_pod_annotation_prometheus_io_scrape] action: keep regex: true - source_labels: [__meta_kubernetes_pod_annotation_prometheus_io_path] action: replace target_label: __metrics_path__ regex: (.+) - source_labels: [__address__, __meta_kubernetes_pod_annotation_prometheus_io_port] action: replace regex: ([^:]+)(?::\\d+)?;(\\d+) replacement: $1:$2 target_label: __address__ - action: labelmap regex: __meta_kubernetes_pod_label_(.+) - source_labels: [__meta_kubernetes_namespace] action: replace target_label: kubernetes_namespace - source_labels: [__meta_kubernetes_pod_name] action: replace target_label: kubernetes_pod_name
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