Kubernetes1.14 监控系统 Prometheus-operator 部署实战

科技 07-05 来源： 云生一二

Kubernetes1.14 监控系统 Prometheus-operator 部署实战

Operator

Operator是由CoreOS公司开发的，用来扩展 Kubernetes API，特定的应用程序控制器，它用来创建、配置和管理复杂的有状态应用，如数据库、缓存和监控系统。Operator基于 Kubernetes 的资源和控制器概念之上构建，但同时又包含了应用程序特定的一些专业知识，比如创建一个数据库的Operator，则必须对创建的数据库的各种运维方式非常了解，创建Operator的关键是CRD（自定义资源）的设计。

CRD是对 Kubernetes API 的扩展，Kubernetes 中的每个资源都是一个 API 对象的集合，例如我们在YAML文件里定义的那些spec都是对 Kubernetes 中的资源对象的定义，所有的自定义资源可以跟 Kubernetes 中内建的资源一样使用 kubectl 操作。

Operator是将运维人员对软件操作的知识给代码化，同时利用 Kubernetes 强大的抽象来管理大规模的软件应用。目前CoreOS官方提供了几种Operator的实现，其中就包括我们今天的主角：Prometheus Operator，Operator的核心实现就是基于 Kubernetes 的以下两个概念：

资源：对象的状态定义

控制器：观测、分析和行动，以调节资源的分布

Prometheus-Operator 架构图

上图是Prometheus-Operator官方提供的架构图，其中Operator是最核心的部分，作为一个控制器，他会去创建Prometheus、ServiceMonitor、AlertManager以及PrometheusRule4个CRD资源对象，然后会一直监控并维持这4个资源对象的状态。

这样我们要在集群中监控什么数据，就变成了直接去操作 Kubernetes 集群的资源对象了，是不是方便很多了。上图中的 Service 和 ServiceMonitor 都是 Kubernetes 的资源，一个 ServiceMonitor 可以通过 labelSelector 的方式去匹配一类 Service，Prometheus 也可以通过 labelSelector 去匹配多个ServiceMonitor。

关于 Prometheus-Operator 四种资源对象的解释

  • Prometheus 是控制创建Prometheus server 集群，在k8s中表现为pod
  • ServiceMonitor 是exporter的各种抽象，exporter是用来提供专门提供metrics数据接口的工具，Prometheus就是通过ServiceMonitor提供的metrics数据接口去 pull 数据的
  • alertmanager 是控制创建alertmanager 集群
  • PrometheusRule 用来定义报警规则文件

安装

采用helm chart 安装

创建ingress tls

kubectl create secret tls prometheus-yun-cn-tls --cert=yun.cer --key=yun.key -n monitoring

修改 Prometheus chart value.yaml

helm fetch stable/prometheus-operator --untar
vim value.yaml
# 开启prometheus 的数据落地
storageSpec:
 volumeClaimTemplate:
 spec:
 storageClassName: rook-ceph-block
 accessModes: ["ReadWriteOnce"]
 resources:
 requests:
 storage: 5Gi
# 修改prometheus-ser 和 AlertManager 的replicas 开启高可用
replicas: 3
# 修改grafana 登录密码
grafana:
 enabled: true
 defaultDashboardsEnabled: true
 adminPassword: admin@123
# 开启 grafana alertmanager prometheus ingress
$ [K8sDev] grep -w "ingress:" values.yaml -A 32|grep -vE "#|^$"
 ingress:
 enabled: true
 annotations:
 kubernetes.io/ingress.class: public-nginx
 labels: {}
 hosts:
 - alertmanager.yun.cn
 paths:
 - /
 tls:
 - secretName: prometheus-yun-cn-tls
 hosts:
 - alertmanager.yun.cn
--
 ingress:
 enabled: ture
 annotations:
 kubernetes.io/ingress.class: public-nginx
 labels: {}
 hosts:
 - grafana.yun.cn
 path: /
 tls:
 - secretName: prometheus-yun-cn-tls
 hosts:
 - grafana.yun.cn
--
 ingress:
 enabled: ture
 annotations:
 kubernetes.io/ingress.class: public-nginx
 labels: {}
 hosts:
 - prometheus.yun.cn
 paths:
 - /
 tls:
 - secretName: prometheus-yun-cn-tls
 hosts:
 - prometheus.yun.cn

部署

kube-state-metrics 的作用是采集k8s集群监控指标的，部署阶段拉取镜像可能会有问题，可以事先在每个node上拉取阿里云的镜像，然后tag

docker pull registry.aliyuncs.com/google_containers/kube-state-metrics:v1.5.0 && docker tag registry.aliyuncs.com/google_containers/kube-state-metrics:v1.5.0 k8s.gcr.io/kube-state-metrics:v1.5.0
kubectl create ns monitoring
helm install --name prometheus-operator -f values.yaml . --namespace monitoring
# 查看pod
kubectl get pod -n monitoring
NAME READY STATUS RESTARTS AGE
alertmanager-prometheus-operator-alertmanager-0 2/2 Running 0 14m
alertmanager-prometheus-operator-alertmanager-1 2/2 Running 0 14m
alertmanager-prometheus-operator-alertmanager-2 2/2 Running 0 14m
prometheus-operator-grafana-5d74ccd7bd-zvzm9 2/2 Running 0 16m
prometheus-operator-kube-state-metrics-5d7558d7cc-hgbdr 1/1 Running 0 6m5s
prometheus-operator-operator-58f46454f8-nxrns 1/1 Running 0 16m
prometheus-operator-prometheus-node-exporter-8vvgk 1/1 Running 0 16m
prometheus-operator-prometheus-node-exporter-dzh88 1/1 Running 0 16m
prometheus-operator-prometheus-node-exporter-fbmtj 1/1 Running 0 16m
prometheus-operator-prometheus-node-exporter-ln5jk 1/1 Running 0 16m
prometheus-operator-prometheus-node-exporter-p56xb 1/1 Running 0 16m
prometheus-prometheus-operator-prometheus-0 3/3 Running 1 14m
prometheus-prometheus-operator-prometheus-1 3/3 Running 1 14m
# 查看 service ingress
kubectl get service,ingress -n monitoring
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
service/alertmanager-operated ClusterIP None <none> 9093/TCP,6783/TCP 60m
service/prometheus-operated ClusterIP None <none> 9090/TCP 60m
service/prometheus-operator-alertmanager ClusterIP 10.100.184.96 <none> 9093/TCP 62m
service/prometheus-operator-grafana ClusterIP 10.100.93.41 <none> 80/TCP 62m
service/prometheus-operator-kube-state-metrics ClusterIP 10.98.180.207 <none> 8080/TCP 62m
service/prometheus-operator-operator ClusterIP 10.103.61.39 <none> 8080/TCP 62m
service/prometheus-operator-prometheus ClusterIP 10.97.234.73 <none> 9090/TCP 62m
service/prometheus-operator-prometheus-node-exporter ClusterIP 10.106.114.236 <none> 9100/TCP 62m
NAME HOSTS ADDRESS PORTS AGE
ingress.extensions/prometheus-operator-alertmanager alertmanager.yun.cn 80, 443 20m
ingress.extensions/prometheus-operator-grafana grafana.yun.cn 80, 443 20m
ingress.extensions/prometheus-operator-prometheus prometheus.yun.cn 80, 443 20m

Hosts 绑定

10.6.201.174 alertmanager.yun.cn
10.6.201.174 grafana.yun.cn
10.6.201.174 prometheus.yun.cn

访问测试

ServiceMonitor

监控etcd

修改ectd启动参数

helm 安装的 prometheus 会自动创建servicemonitor 去监控etcd,但是kubernetes1.14中的etcd版本是3.3.10,3.3.10以后的metrics 和 health接口已经配置通过一个独立的配置项--listen-metrics-urls 开放出来，所以要修改etcd的yaml来重新启动etcd

# 在command 追加,大概1min左右etcd就会重启完毕
vim /etc/kubernetes/manifests/etcd.yaml
- --listen-metrics-urls=http://192.168.137.102:2381

创建serviceMonitor

helm 已经自动为etcd创建了一个serviceMonitor

kubectl get servicemonitors.monitoring.coreos.com -n monitoring prometheus-operator-kube-etcd -o yaml
apiVersion: monitoring.coreos.com/v1
kind: ServiceMonitor
metadata:
 creationTimestamp: 2019-05-23T01:46:55Z
 generation: 1
 labels:
 app: prometheus-operator-kube-etcd
 chart: prometheus-operator-5.0.11
 heritage: Tiller
 release: prometheus-operator
 name: prometheus-operator-kube-etcd
 namespace: monitoring
 resourceVersion: "28021953"
 selfLink: /apis/monitoring.coreos.com/v1/namespaces/monitoring/servicemonitors/prometheus-operator-kube-etcd
 uid: a5284d89-7cfc-11e9-97f1-fa163e92035a
spec:
 endpoints:
 - bearerTokenFile: /var/run/secrets/kubernetes.io/serviceaccount/token
 port: http-metrics # 匹配service port
 jobLabel: jobLabel
 namespaceSelector:
 matchNames:
 - kube-system
 selector:
 matchLabels:
 app: prometheus-operator-kube-etcd # 匹配service labels
 release: prometheus-operator # 匹配service labels

创建service/endpoints

serviceMonitor 监控 应用是通过selector 匹配 lable监控pod的service的/metrics接口来获取监控数据的

所以现在我们要为etcd 创建service、endpoints，serviceMonitor才能拿到监控数据

vim prometheus-etcdService.yaml
apiVersion: v1
kind: Service
metadata:
 name: etcd-k8s
 namespace: kube-system
 labels:
 app: prometheus-operator-kube-etcd
 release: prometheus-operator
spec:
 selector:
 component: etcd
 type: ClusterIP
 clusterIP: None
 ports:
 - name: http-metrics
 port: 2381
 protocol: TCP
---
apiVersion: v1
kind: Endpoints
metadata:
 name: etcd-k8s
 namespace: kube-system
 labels:
 app: prometheus-operator-kube-etcd
 release: prometheus-operator
subsets:
- addresses:
 - ip: 192.168.137.102 # master 主机ip
 nodeName: master-102 # master 主机名
 ports:
 - name: http-metrics
 port: 2382
 protocol: TCP
kubectl create -f prometheus-etcdService.yaml

查看prometheus--->targets 页面 发现etcd状态已经是UP了

查看grafana 就可以看到etcd的监控数据了

Grafana 配置

grafana 基本不需要配置，operator 已经把我们用到的监控模板内置了

配置监控报警接收

查看secret

  • alertmanager 报警接收者的信息是配置在secret 中，所以我们要找到这个secret
$ [K8sDev] kubectl get secrets -n monitoring
NAME TYPE DATA AGE
alertmanager-prometheus-operator-alertmanager Opaque 1 3h58m
default-token-fjqg7 kubernetes.io/service-account-token 3 4h2m
prometheus-yun-cn-tls kubernetes.io/tls 2 3h33m
prometheus-operator-alertmanager-token-rtrwt kubernetes.io/service-account-token 3 3h58m
prometheus-operator-grafana Opaque 3 3h58m
prometheus-operator-grafana-token-pllv5 kubernetes.io/service-account-token 3 3h58m
prometheus-operator-kube-state-metrics-token-x7qs4 kubernetes.io/service-account-token 3 3h58m
prometheus-operator-operator-token-sxn65 kubernetes.io/service-account-token 3 3h58m
prometheus-operator-prometheus-node-exporter-token-m7twt kubernetes.io/service-account-token 3 3h58m
prometheus-operator-prometheus-token-5gt5m kubernetes.io/service-account-token 3 3h58m
prometheus-prometheus-operator-prometheus Opaque 1 3h56m
  • 可以看到第一个secret alertmanager-prometheus-operator-alertmanager 应该就是，输出看下
$ [K8sDev] kubectl get secrets -n monitoring alertmanager-prometheus-operator-alertmanager -o yaml
apiVersion: v1
data:
 alertmanager.yaml: Z2xvYmFsOgogIHJlc29sdmVfdGltZW91dDogNW0KcmVjZWl2ZXJzOgotIG5hbWU6ICJudWxsIgpyb3V0ZToKICBncm91cF9ieToKICAtIGpvYgogIGdyb3VwX2ludGVydmFsOiA1bQogIGdyb3VwX3dhaXQ6IDMwcwogIHJlY2VpdmVyOiAibnVsbCIKICByZXBlYXRfaW50ZXJ2YWw6IDEyaAogIHJvdXRlczoKICAtIG1hdGNoOgogICAgICBhbGVydG5hbWU6IFdhdGNoZG9nCiAgICByZWNlaXZlcjogIm51bGwiCg==
kind: Secret
metadata:
 creationTimestamp: 2019-05-23T01:46:54Z
 labels:
 app: prometheus-operator-alertmanager
 chart: prometheus-operator-5.0.11
 heritage: Tiller
 release: prometheus-operator
 name: alertmanager-prometheus-operator-alertmanager
 namespace: monitoring
 resourceVersion: "28021773"
 selfLink: /api/v1/namespaces/monitoring/secrets/alertmanager-prometheus-operator-alertmanager
 uid: a4c7b6fe-7cfc-11e9-97f1-fa163e92035a
type: Opaque
  • base64 解密data
$ [K8sDev] echo "Z2xvYmFsOgogIHJlc29sdmVfdGltZW91dDogNW0KcmVjZWl2ZXJzOgotIG5hbWU6ICJudWxsIgpyb3V0ZToKICBncm91cF9ieToKICAtIGpvYgogIGdyb3VwX2ludGVydmFsOiA1bQogIGdyb3VwX3dhaXQ6IDMwcwogIHJlY2VpdmVyOiAibnVsbCIKICByZXBlYXRfaW50ZXJ2YWw6IDEyaAogIHJvdXRlczoKICAtIG1hdGNoOgogICAgICBhbGVydG5hbWU6IFdhdGNoZG9nCiAgICByZWNlaXZlcjogIm51bGwiCg==" |base64 -D
global:
 resolve_timeout: 5m
receivers:
- name: "null"
route:
 group_by:
 - job
 group_interval: 5m
 group_wait: 30s
 receiver: "null"
 repeat_interval: 12h
 routes:
 - match:
 alertname: Watchdog
 receiver: "null"
  • 在界面上查看alertmanager 配置，发现和解密出的基本一致

  • 修改secret
  • 将上面解密出来的数据保存到文件"alertmanager.yaml",并修改
global:
 resolve_timeout: 5m
 smtp_smarthost: 'smtp.163.com:25'
 smtp_from: 'chulinx@163.com'
 smtp_auth_username: '<email>'
 smtp_auth_password: '<邮箱授权码>'
 smtp_hello: '163.com'
 smtp_require_tls: false
route:
 group_by: ['job', 'severity']
 group_wait: 30s
 group_interval: 5m
 repeat_interval: 12h
 receiver: default
receivers:
- name: 'default'
 email_configs:
 - to: '547571608@qq.com'
 send_resolved: true
  • 重新创建secret
kubectl delete secrets -n monitoring alertmanager-prometheus-operator-alertmanager
kubectl create secret generic alertmanager-prometheus-operator-alertmanager --from-file=alertmanager.yaml -n monitoring
  • 界面查看,已经生效

查看报警

  • 登录邮箱查看报警邮件

rook-ceph监控

创建service、endpoints

rook 也是原生支持prometheus的，metrics 是由mgr暴露的，安装rook的时候已经给我们创建了service/endpoints

kubectl get endpoints,svc -n rook-ceph
NAME ENDPOINTS AGE
endpoints/rook-ceph-mgr 10.244.4.233:9283 141d
endpoints/rook-ceph-mgr-dashboard 10.244.4.233:443 141d
endpoints/rook-ceph-mon-a 10.244.1.70:6790 141d
endpoints/rook-ceph-mon-c 10.244.3.179:6790 141d
endpoints/rook-ceph-mon-d 10.244.4.232:6790 96d
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
service/rook-ceph-mgr ClusterIP 10.103.95.20 <none> 9283/TCP 141d
service/rook-ceph-mgr-dashboard ClusterIP 10.107.244.166 <none> 443/TCP 141d
service/rook-ceph-mon-a ClusterIP 10.104.65.218 <none> 6790/TCP 141d
service/rook-ceph-mon-c ClusterIP 10.111.140.231 <none> 6790/TCP 141d
service/rook-ceph-mon-d ClusterIP 10.103.72.214 <none> 6790/TCP 96d

创建serviceMonitor

vim prometheus-serviceMonitorRook.yaml
apiVersion: monitoring.coreos.com/v1
kind: ServiceMonitor
metadata:
 name: rook-ceph-mgr
 namespace: monitoring
 labels:
 app: prometheus-operator-rookceph
 chart: prometheus-operator-5.0.11
 heritage: Tiller
 release: prometheus-operator
 app: rook-ceph-mgr
 rook_cluster: rook-ceph
spec:
 jobLabel: rook-app
 endpoints:
 - port: http-metrics
 interval: 30s
 selector:
 matchLabels:
 app: rook-ceph-mgr
 rook_cluster: rook-ceph
 namespaceSelector:
 matchNames:
 - rook-ceph

查看endpoint

导入rook 监控模板

  • ROOK 官方推荐的三个dashboards
  • Ceph - Cluster
  • Ceph - Pools
  • Ceph - OSD

PrometheusRule

Prometheus-Operator 把AlertManager 的监控规则抽象为一个k8s中的crd，这个crd就是PrometheusRule，我们来看下如何指定一个监控规则(PrometheusRule)

自定义rook-ceph 磁盘使用率报警

vim prometheus-rookCephRules.yaml
apiVersion: monitoring.coreos.com/v1
kind: PrometheusRule
metadata:
 labels:
 app: prometheus-operator # lables 安装operator 已经创建的rule来写，operator会根据lables选择
 chart: prometheus-operator-5.0.11
 heritage: Tiller
 release: prometheus-operator
 name: rook-ceph-rules
 namespace: monitoring
spec:
 groups:
 - name: rook-ceph
 rules:
 - alert: Ceph 磁盘可用空间报警
 annotations:
 summary: 如果ceph disk 磁盘使用率大于75%，请尽快处理
 description: 如果ceph disk 磁盘使用率大于75%，触发报警
 expr: |
 (ceph_cluster_total_used_bytes/ceph_cluster_total_bytes)*100 > 75
 for: 3m
 labels:
 severity: critical
kubectl create -f prometheus-rookCephRules.yaml

Prometheus Alerts 页面可以看到我们定义的 rule

模拟故障发送报警邮件

将阈值调整到10,触发报警

apiVersion: monitoring.coreos.com/v1
kind: PrometheusRule
metadata:
 labels:
 app: prometheus-operator # lables 安装operator 已经创建的rule来写，operator会根据lables选择
 chart: prometheus-operator-5.0.11
 heritage: Tiller
 release: prometheus-operator
 name: rook-ceph-rules
 namespace: monitoring
spec:
 groups:
 - name: rook-ceph
 rules:
 - alert: Ceph 磁盘可用空间报警
 annotations:
 summary: 如果ceph disk 磁盘使用率大于75%，请尽快处理
 description: 如果ceph disk 磁盘使用率大于75%，触发报警
 expr: |
 (ceph_cluster_total_used_bytes/ceph_cluster_total_bytes)*100 > 10
 for: 3m
 labels:
 severity: critical
kubectl apply -f prometheus-rookCephRules.yaml

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