K8S之监控etcd集群（自带metrics接口）

一、监控etcd集群

1.1、查看接口信息

[root@k8s-master01 ~]# curl --cert /etc/etcd/ssl/etcd.pem --key /etc/etcd/ssl/etcd-key.pem  https://192.168.1.201:2379/metrics -k 
# 这样也行
curl -L http://localhost:2379/metrics

1.2、创建service和Endpoints

# 创建ep和svc代理外部的etcd服务，其他自带metrics接口的服务也是如此！
apiVersion: v1
kind: Endpoints
metadata:
  labels:
    app: etcd-k8s
  name: etcd-k8s
  namespace: kube-system
subsets:
- addresses:     # etcd节点对应的主机ip，有几台就写几台
  - ip: 192.168.1.201
  - ip: 192.168.1.202
  - ip: 192.168.1.203
  ports:
  - name: etcd-port
    port: 2379   # etcd端口
    protocol: TCP
---
apiVersion: v1
kind: Service 
metadata:
  labels:
    app: etcd-k8s
  name: etcd-k8s
  namespace: kube-system
spec:
  ports:
  - name: etcd-port
    port: 2379
    protocol: TCP
    targetPort: 2379
  type: ClusterIP

1.3、测试是否代理成功

#再次curl，把IP换成svc的IP测试，输出相同内容即创建成功
[root@k8s-master01 ~]# kubectl get svc -n kube-system etcd-k8s
NAME      TYPE        CLUSTER-IP      EXTERNAL-IP   PORT(S)    AGE
etcd-ep   ClusterIP   10.103.53.103   <none>        2379/TCP   8m54s

# 再次请求接口
[root@k8s-master01 ~]# curl --cert /etc/etcd/ssl/etcd.pem --key /etc/etcd/ssl/etcd-key.pem  https://10.111.200.116:2379/metrics -k

1.4、创建secret

# 1、这里我们k8s-master01节点进行创建,ca为k8sca证书，剩下2个为etcd证书，这是我证书所在位置
  cert-file: '/etc/kubernetes/pki/etcd/etcd.pem'
  key-file: '/etc/kubernetes/pki/etcd/etcd-key.pem'
  trusted-ca-file: '/etc/kubernetes/pki/etcd/etcd-ca.pem'
  
# 2、接下来我们需要创建一个secret，让prometheus pod节点挂载
kubectl create secret generic etcd-ssl --from-file=/etc/kubernetes/pki/etcd/etcd-ca.pem --from-file=/etc/kubernetes/pki/etcd/etcd.pem --from-file=/etc/kubernetes/pki/etcd/etcd-key.pem -n monitoring

# 3、创建完成后可以检查一下
[root@k8s-master01 prometheus-down]# kubectl describe secrets -n monitoring etcd-ssl
Name:         etcd-ssl
Namespace:    monitoring
Labels:       <none>
Annotations:  <none>

Type:  Opaque

Data
====
etcd-ca.pem:   1367 bytes
etcd-key.pem:  1679 bytes
etcd.pem:      1509 bytes

1.5、编辑prometheus，把证书挂载进去

# 1、通过edit直接编辑prometheus
[root@k8s-master01 ~]# kubectl edit prometheus k8s -n monitoring
# 在replicas底下加上secret名称
replicas:2
secrets:
- etcd-ssl #添加secret名称

# 进入容器查看，就可以看到证书挂载进去了
[root@k8s-master01 prometheus-down]# kubectl exec -it -n monitoring prometheus-k8s-0 /bin/sh

# 查看文件是否存在
/prometheus $ ls /etc/prometheus/secrets/etcd-ssl/
etcd-ca.pem   etcd-key.pem  etcd.pem

1.6、创建ServiceMonitor

[root@k8s-master01 ~]# cat etcd-servicemonitor.yaml
apiVersion: monitoring.coreos.com/v1
kind: ServiceMonitor
metadata:
  name: etcd-k8s
  namespace: monitoring
  labels:
    app: etcd-k8s
spec:
  jobLabel: app
  endpoints:
    - interval: 30s
      port: etcd-port  # 这个port对应 Service.spec.ports.name
      scheme: https
      tlsConfig:
        caFile: /etc/prometheus/secrets/etcd-ssl/etcd-ca.pem #证书路径 (在prometheus pod里路径)
        certFile: /etc/prometheus/secrets/etcd-ssl/etcd.pem
        keyFile: /etc/prometheus/secrets/etcd-ssl/etcd-key.pem
        insecureSkipVerify: true  # 关闭证书校验
  selector:
    matchLabels:
      app: etcd-k8s  # 跟scv的lables保持一致
  namespaceSelector:
    matchNames:
    - kube-system    # 跟svc所在namespace保持一致
# 匹配Kube-system这个命名空间下面具有app=etcd-k8s这个label标签的Serve，job label用于检索job任务名称的标签。由于证书serverName和etcd中签发的证书可能不匹配，所以添加了insecureSkipVerify=true将不再对服务端的证书进行校验

1.7、页面查看三个etcd节点都获取到数据

此处数据获取有点慢，需要等待一下

1.8、grafana模板导入

数据采集完成后，接下来可以在grafana中导入dashboard

# 打开官网来的如下图所示，点击下载JSO文件
grafana官网：https://grafana.com/grafana/dashboards/3070
中文版ETCD集群插件：https://grafana.com/grafana/dashboards/9733

点击HOME–>导入模板

导入后页面展示