ECS：如何在 SNMP 代理程式上啟用 TCP 和/或 UDP

Summary: 根據預設，Simple Network Management Protocol (SNMP) 會使用使用者資料包通訊協定 (UDP) 傳輸層通訊協定，以報告 Elastic Cloud Storage (ECS) 上個別節點的健全狀況。有時會使用 Transmission Control Protocol (TCP)，這是以工作階段為基礎的 SNMP 通訊協定。這是需要使用 TCP 通訊協定的特定安全性或作業考量所必備的。 ...

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Instructions

根據預設，Simple Network Management Protocol (SNMP) 會使用使用者資料包通訊協定 (UDP) 傳輸層通訊協定，以報告 Elastic Cloud Storage (ECS) 上個別節點的健全狀況。有時會使用 Transmission Control Protocol (TCP)，這是以工作階段為基礎的 SNMP 通訊協定。這是需要使用 TCP 通訊協定的特定安全性或作業考量所必備的。

下列設定可允許 TCP 和 UDP 透過 SNMP 進行通訊：
  1. 新增 agentaddress udp:161,tcp:161 以允許在節點 SNMP 代理程式上使用 TCP 和 UDP 通訊協定：
命令：
# sudo vi /etc/snmp/snmpd.conf

範例： 
#       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. 在節點上重新啟動 SNMP 代理程式，以讓組態的新變更生效：
命令：
# sudo systemctl restart snmpd
# sudo systemctl status snmpd

範例： 
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. 確認已進行變更，且 SNMP 正在聆聽 TCP 和 UDP 通訊協定：
命令：
# sudo netstat -lntup | grep snmp

範例： 
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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