Network monitoring with prometheus and grafana

Network monitoring with prometheus and grafana

Components

• Docker (v.4.22.0)
• prometheus (v.2.46.0)
• snmp exporter (v.0.23.0)
• grafana (v.10.0.3)

Network configuration diagram

System architecture

Deploy

Create snmp.yml file

• Get snmp.yml generater from https://github.com/prometheus/snmp_exporter.git.
• Generate snmp.yml with mibs.
• Copy the generated snmp.yml to the same directory.

Router setting

• Configure the IP address, DHCP server, DNS and NAT (PAT).
  ex.) cisco Router
  • IP address

    int vlan 1
    ip add 192.168.1.254 255.255.255.0 int g 8
    ip add dhcp

  • Default route (Last resort gateway)

    ip route 0.0.0.0 0.0.0.0 dhcp

  • DHCP

    service dhcp
    ip dhcp pool HOME
    network 192.168.1.0 255.255.255.0
    default-router 192.168.1.254

  • DNS

    dns-server 8.8.8.8
    ip dns server

  • NAT

    access-list 1 permit 192.168.1.0 0.0.0.255
    ip nat inside source list 1 int g 8 overload
    int vlan 1
    ip nat inside
    int g 8
    ip nat outside

• Configure ACLs accordingly.

L2SW setting

• Configure the IP address and default gateway.
  ex.) cisco L2SW

  • IP address

    int vlan 1
    ip add 192.168.1.99 255.255.255.0

  • Default gateway

    ip default-gateway 192.168.1.254

• Enable snmp.
  ex.) cisco L2SW

  snmp-server community snmp ro
  snmp-server enable traps

  At this time, the community name is set to "snmp" as configured in snmp.yml.

Set docker directory

• Fill the volume fields "prometheus", "grafana" and "snmp-exporter" in docer-compose.yml with the absolute path of this folder ("grafana" is not a volume field, but an env_file field).

Configure prometheus

• Fill the targets field of the "snmp-exporter" job in prometheus.yml with the IP address of the L2SW.

• Fill the params-module field in the prometheus.yml with the module name that is written in snmp.yml.

Execute docker-compose

ex.)

docker compose up

Monitoring example