# prometheus-operator 介绍
- 支持自动化方式管理Prometheus和alertmanager
- 支持原生配置管理
prometheus-operator集群 [yaml配置文件github管理地址](https://gitee.com/huyipow/prometheus-operator.git)
### prometheus-opeartor 核心组件
**Monitoring infrastructure**
- Configuration
- Rules
- node-exporter
- Prometheus
- Self upgrading
- service:
- serviceMonitoring:
- prometheus-operator:
#### Self hosted Kubernetes
- Like self-hosted compiler
- Kubernetes components run in Kubernetes
- Can be discovered just like anything else
- Kubernetes itself is just workload
> Note: ServiceMonitor objects must be in the same namespace as the Prometheus object. The fact that your ServiceMonitor now shows up in the config is a good thing. That means it was selected and parsed by the Prometheus Operator. The namespaceSelector is in regard to the Service objects, that a ServiceMonitor selects. Basically the point you are at is: your Prometheus instance is running, your ServiceMonitor is selected, but doesn't select the Service yet that you expect.
#### Information available for Pods
- **All Pods use resources**
CPU, memory, network, disk
- **Kubernetes API for metadata**
To associate Pods with each other
- **Custom metrics are not generic**
#### Workload metrics
- node-exporter
- cAdvisor
- [kube-state-metrics ](https://github.com/kubernetes/kube-state-metrics)
#### kube-state-metrics
- kubectl as metrics
- Kubernetes API converted to Prometheus metrics
- Cluster state metrics
#### What's a target?
- HTTP Server with /metrics endpoint
- Discovered by an SD mechanism
***Static target list***
***DNS discovery***
***Kubernetes discovery***
#### Kubernetes Discovery
- Discover targets
**Pods**
**Nodes**
**Endpoints/Sevices**
- Automatically reconfigure
**Add,update,remove**
#### Prometheus for Kubernetes Configuration
This guide is intended to give an introduction to all the parts required to start monitoring a Kubernetes cluster with Prometheus using the Prometheus Operator.
- [Cluster Monitoring](https://github.com/coreos/prometheus-operator/blob/master/Documentation/user-guides/cluster-monitoring.md)
### prometheus-operator RBAC 权限管理
#### 创建集群角色用户：prometheus-operator
cat prometheus-operator-service-account.yaml
apiVersion: v1
kind: ServiceAccount
metadata:
name: prometheus-operator
namespace: monitoring
#### 创建prometheus-operator 集群角色
cat prometheus-operator-cluster-role.yaml
apiVersion: rbac.authorization.k8s.io/v1beta1
kind: ClusterRole
metadata:
name: prometheus-operator
rules:
- apiGroups:
- extensions
resources:
- thirdpartyresources
verbs:
- "*"
- apiGroups:
- apiextensions.k8s.io
resources:
- customresourcedefinitions
verbs:
- "*"
- apiGroups:
- monitoring.coreos.com
resources:
- alertmanagers
- prometheuses
- servicemonitors
verbs:
- "*"
- apiGroups:
- apps
resources:
- statefulsets
verbs: ["*"]
- apiGroups: [""]
resources:
- configmaps
- secrets
verbs: ["*"]
- apiGroups: [""]
resources:
- pods
verbs: ["list", "delete"]
- apiGroups: [""]
resources:
- services
- endpoints
verbs: ["get", "create", "update"]
- apiGroups: [""]
resources:
- nodes
verbs: ["list", "watch"]
- apiGroups: [""]
resources:
- namespaces
verbs: ["list"]
#### 绑定集群角色
cat prometheus-operator-cluster-role-binding.yaml
apiVersion: rbac.authorization.k8s.io/v1beta1
kind: ClusterRoleBinding
metadata:
name: prometheus-operator
roleRef:
apiGroup: rbac.authorization.k8s.io
kind: ClusterRole
name: prometheus-operator
subjects:
- kind: ServiceAccount
name: prometheus-operator
namespace: monitoring
#### 部署prometheus-operator
# cat prometheus-operator.yaml
apiVersion: extensions/v1beta1
kind: Deployment
metadata:
labels:
k8s-app: prometheus-operator
name: prometheus-operator
namespace: monitoring
spec:
replicas: 1
template:
metadata:
labels:
k8s-app: prometheus-operator
spec:
containers:
- args:
- --kubelet-service=kube-system/kubelet
- --config-reloader-image=quay.io/coreos/configmap-reload:v0.0.1
image: quay.io/coreos/prometheus-operator:v0.15.0
name: prometheus-operator
ports:
- containerPort: 8080
name: http
resources:
limits:
cpu: 200m
memory: 100Mi
requests:
cpu: 100m
memory: 50Mi
serviceAccountName: prometheus-operator
#### 部署prometheus-opeartor service
cat prometheus-operator-service.yaml
apiVersion: v1
kind: Service
metadata:
name: prometheus-operator
namespace: monitoring
labels:
k8s-app: prometheus-operator
spec:
type: ClusterIP
ports:
- name: http
port: 8080
targetPort: http
protocol: TCP
selector:
k8s-app: prometheus-operator
#### 部署 prometheus-operator-service-monitor
cat prometheus-k8s-service-monitor-prometheus-operator.yaml
apiVersion: monitoring.coreos.com/v1
kind: ServiceMonitor
metadata:
name: prometheus-operator
namespace: monitoring
labels:
k8s-app: prometheus-operator
spec:
endpoints:
- port: http
selector:
matchLabels:
k8s-app: prometheus-operator
