snmp_exporter快速监控交换机

使用默认mib，通用快速部署

## 下载
```
[root@localhost monitor]# pwd
/opt/monitor
[root@localhost monitor]# wget  https://github.com/prometheus/snmp_exporter/releases/download/v0.25.0/snmp_exporter-0.25.0.linux-amd64.tar.gz
[root@localhost monitor]# tar -zxvf snmp_exporter-0.25.0.linux-amd64.tar.gz
[root@localhost monitor]# mv  snmp_exporter-0.25.0.linux-amd64  snmp_exporter 
[root@localhost monitor]# ls
prometheus  snmp_exporter
```

## 开机自启动snmp_exporter
`vi /usr/lib/systemd/system/snmp_exporter.service`

```
[Unit]
Description=snmp_exporter
After=network.target
[Service]
ExecStart=/opt/monitor/snmp_exporter/snmp_exporter --config.file=/opt/monitor/snmp_exporter/snmp.yml
Restart=on-failure
[Install]
WantedBy=multi-user.target

```

```
systemctl daemon-reload
systemctl start snmp_exporter
systemctl enable snmp_exporter

```

## 编辑vi prometheus.yml
增加
`vi prometheus.yml`

```

- job_name: 'snmp_exporter'
    scrape_interval: 1m
    scrape_timeout: 30s
    static_configs:
      - targets:
        - 192.168.1.251
		- 192.168.1.252
		- 192.168.1.253
    metrics_path: /snmp
    params:
      auth: [public_v2]
      module: [if_mib]
    relabel_configs:
      - source_labels: [__address__]
        target_label: __param_target
      - source_labels: [__param_target]
        target_label: instance
      - target_label: __address__
        replacement: localhost:9116

```

```
systemctl restart prometheus
systemctl status prometheus

```

## Grafana展示
Grafana仪表盘用（AKA SNMP Network），通用的SNMP Network(网络设备监控)
安装id:15473

## 备注
测试主机能否snmp连到交换机

安装snmpwalk
`sudo yum install net-snmp-utils`

测试获取snmp数据
`snmpwalk -v2c -c public 192.168.1.251`

查看版本
`snmpwalk -V`
NET-SNMP version: 5.7.2

参考：
【sw网络监控】通过snmp协议相关的snmp-exporter（收集交换机网络监控数据）+ promethus + grafana
https://blog.csdn.net/zerotoall/article/details/136567901