prometheus监控k8s集群node节点/linux操作系统

prometheus监控k8s集群node节点/linux操作系统

一、监控linux操作系统

　　1、下载二进制包

wget https://github.com/prometheus/node_exporter/releases/download/v1.7.0/node_exporter-1.7.0.linux-amd64.tar.gz

　　2、解压，移动至/opt并做软连接

tar zxf node_exporter_linux_amd64.tar.gz -C /opt/
mv /opt/node_exporter-1.7.0.linux-amd64 /opt/node_exporter-1.7.0
ln -s /opt/node_exporter-1.7.0 /usr/local/node_exporter

　　3、配置systemd管理脚本

　　vim /usr/lib/systemd/system/node_exporter.service

[Unit]
Description=node_exporter
After=network.target

[Service]
Type=simple
ExecStart=/usr/local/node_exporter/node_exporter

[Install]
WantedBy=multi-user.target

　　4、启动node_exporter并设置开机启动。

systemctl start node_exporter
systemctl enable node_exporter

　　5、防火墙方通端口

firewall-cmd --permanent --add-port=9100/tcp
firewall-cmd --reload

二、k8s部署node_exporter，监控node节点，该步骤需在k8s集群中执行。

　　1、创建yaml文件

vim  node_exporter.yaml

apiVersion: apps/v1
kind: DaemonSet
metadata:
  name: node-exporter
  namespace: monitor
  labels:
    name: node-exporter
spec:
  selector:
    matchLabels:
     name: node-exporter
  template:
    metadata:
      labels:
        name: node-exporter
    spec:
      hostPID: true
      hostIPC: true
      hostNetwork: true
      containers:
      - name: node-exporter
        image: quay.io/prometheus/node-exporter:v1.7.0
        ports:
        - containerPort: 9100
        resources:
          requests:
            cpu: 0.15
        securityContext:
          privileged: true      #开启特权模式
        args:
        - --path.procfs
        - /host/proc
        - --path.sysfs
        - /host/sys
        - --collector.filesystem.ignored-mount-points
        - '"^/(sys|proc|dev|host|etc)($|/)"'
        volumeMounts:
        - name: dev
          mountPath: /host/dev
        - name: proc
          mountPath: /host/proc
        - name: sys
          mountPath: /host/sys
        - name: rootfs
          mountPath: /rootfs
      tolerations:
      - key: "node-role.kubernetes.io/master"
        operator: "Exists"
        effect: "NoSchedule"
      volumes:
        - name: proc
          hostPath:
            path: /proc
        - name: dev
          hostPath:
            path: /dev
        - name: sys
          hostPath:
            path: /sys
        - name: rootfs
          hostPath:
            path: /

　　2、使用yaml文件部署node_exporter

kubectl create namespace monitor
kubectl apply -f node_exporter.yaml

　　3、检查node-exporter是否创建成功

　　查看pod运行情况

kubectl get pod -nmonitor

　　查看本地监听

三、配置prometheus采集

　　1、修改prometheus配置文件。

　　vim /usr/local/prometheus/prometheus.yml

#在scrape_configs模块下添加以下配置
- job_name: 'node_exporter'
  scrape_interval: 10s
  static_configs:
    - targets: ['xxx.xxx.xxx.xxx:9100','xxx.xxx.xxx.xxx:9100']

　　现配置文件信息如下：

　　2、重启prometheus

systemctl restart prometheus

 　　3、查看node监控情况

在浏览器打开地址http://xxx.xxx.xxx.xxx:9090