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ECS: Sådan aktiveres TCP og eller UDP på en SNMP-agent

Summary: Som standard bruger SNMP (Simple Network Management Protocol) UDP(User Datagram Protocol) Transport Layer-protokollen til at rapportere nodetilstand individuelt på Elastic Cloud Storage (ECS). Nogle gange bruges TCP (Transmission Control Protocol), som er en sessionsbaseret protokol til SNMP. Dette er påkrævet af hensyn til specifikke sikkerheds- eller driftsmæssige problemer, der kræver brug af TCP-protokol. ...

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Instructions

Som standard bruger SNMP (Simple Network Management Protocol) UDP(User Datagram Protocol) Transport Layer-protokollen til at rapportere nodetilstand individuelt på Elastic Cloud Storage (ECS). Nogle gange bruges TCP (Transmission Control Protocol), som er en sessionsbaseret protokol til SNMP. Dette er påkrævet af hensyn til specifikke sikkerheds- eller driftsmæssige problemer, der kræver brug af TCP-protokol.
 
Følgende kan konfigureres til at tillade TCP- og UDP-kommunikation via SNMP:
  1. Tilføj agentadressens udp:161,tcp:161 for at tillade TCP- og UDP-protokoller på nodens SNMP-agenter:
Kommando:
# sudo vi /etc/snmp/snmpd.conf

Eksempel:
#       sec.name  source          community
com2sec local       localhost       secret42
com2sec cust1_sec   192.0.2.0/24    public
com2sec cust1_sec   192.0.2.0/24    public
com2sec cust1_sec   0.0.0.0/0    happyplace
com2sec snmpv3_user 198.51.100.0/24 public
com2sec snmpv3_user 198.51.100.0/24 public

agentaddress udp:161,tcp:161

...
 

  1. Genstart SNMP-agenten på noderne for at foretage de nye ændringer i konfigurationen:
Kommando:
# sudo systemctl restart snmpd
# sudo systemctl status snmpd


Eksempel:
admin@node1:~> sudo systemctl restart snmpd
admin@node1:~> sudo systemctl status snmpd
  snmpd.service - LSB: Net-SNMP agent
   Loaded: loaded (/etc/init.d/snmpd; bad; vendor preset: disabled)
   Active: active (running) since Fri 2020-05-01 15:16:52 UTC; 20min ago
     Docs: man:systemd-sysv-generator(8)
  Process: 80940 ExecStop=/etc/init.d/snmpd stop (code=exited, status=0/SUCCESS)
  Process: 80948 ExecStart=/etc/init.d/snmpd start (code=exited, status=0/SUCCESS)
    Tasks: 1 (limit: 512)
   Memory: 4.5M
      CPU: 802ms
   CGroup: /system.slice/snmpd.service
             80959 /usr/sbin/snmpd -r -A -LF n /var/log/net-snmpd.log -p /var/run/snmpd.pid

May 01 15:16:52 ecsnode1.gslabs.lab.emc.com systemd[1]: Starting LSB: Net-SNMP agent...
May 01 15:16:52 node1 snmpd[80948]: Starting snmpd..done
May 01 15:16:52 node1 systemd[1]: Started LSB: Net-SNMP agent.
 

  1. Bekræft, at ændringerne har fundet sted, og at SNMP lytter på TCP- og UDP-protokoller:
Kommando:
# sudo netstat -lntup | grep snmp

Eksempel:
admin@node1:~> sudo netstat -lntup | grep snmp
tcp        0      0 127.0.0.1:199           0.0.0.0:*               LISTEN      80959/snmpd
tcp        0      0 0.0.0.0:161             0.0.0.0:*               LISTEN      80959/snmpd
udp        0      0 0.0.0.0:161             0.0.0.0:*                           80959/snmpd

This change to the SNMP agents on the nodes can be done during the agent deployments in KB ECS: How to setup SNMP v2c and v3 monitoring support

Affected Products

ECS Appliance

Products

ECS Appliance, ECS Appliance Gen 1, ECS Appliance Gen 2, ECS Appliance Gen 3
Article Properties
Article Number: 000021179
Article Type: How To
Last Modified: 03 Mar 2023
Version:  5
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