armbian系统安装和卸载snmp服务(SNMPV2操作版本)

文章目录

说明
基知
干净卸载snmp服务并清除配置文件
安装SNMP
SNMPV2远程连接配置
基本设备信息查询
问题
- Errors were encountered while processing: snmpd
- Cannot adopt OID……

说明

由于各位小伙伴，可能在安装过程中出现意外或者其他情况，本文先说明卸载步骤，然后再介绍安装步骤

基知

SNMP (Simple Network Management Protocol) 是一种网络管理协议，用于监控和管理网络设备。
MIB 文件定义了 SNMP 管理信息的结构和属性。
armbian上设备SNMP管理的相关软件介绍
- snmp 是用于在客户端上进行SNMP操作的工具包
- snmpd SNMP代理服务，用于在服务器上提供SNMP功能（SNMP 的守护进程，负责接收 SNMP 请求并提供相关的网络管理功能）
- snmp-mibs-downloader 是用于下载和安装 SNMP MIB (Management Information Base) 文件的工具。

干净卸载snmp服务并清除配置文件

停止snmpd服务：
```
sudo systemctl stop snmpd
```

卸载 snmp、snmpd、snmp-mibs-downloader 软件包：

sudo apt remove --purge snmpd snmp-mibs-downloader

清理残留文件：

sudo apt autoremove卸载 snmp、snmpd、snmp-mibs-downloader 软件包

安装SNMP

Armbian 操作系统上安装 SNMP（Simple Network Management Protocol）步骤：

更新软件包列表：
```
sudo apt update
```
安装 SNMP 相关的软件包:SNMP 客户端工具（snmp）、SNMP 代理服务（snmpd）和 SNMP MIB 文件下载器（snmp-mibs-downloader）：
```
sudo apt install snmp snmpd snmp-mibs-downloader
```
安装完毕后，SNMP服务将自动启动。
```
sudo systemctl status snmpd
```
配置 SNMP 代理服务：默认情况下，SNMP 代理服务已经自动配置好。配置文件位于 /etc/snmp/snmpd.conf
```
sudo vim /etc/snmp/snmpd.conf
```

SNMPV2远程连接配置

修改SNMP配置文件以允许接受使远程主机使用public社区字符串，连接并具有整个MIB的读写权限：

打开SNMP配置文件：
```
sudo vim /etc/snmp/snmpd.conf
```
修改agentaddress 127.0.0.1,[::1]或者#agentAddress udp:161,udp6:[::1]:161，最终将其修改为agentAddress udp:161,udp6:[::1]:161：
```
agentAddress udp:161,udp6:[::1]:161
#rocommunity public localhost
```
把public社区字符串的权限从只读（“rocommunity”）改为读写（“rwcommunity”），找到以下两行：
```
rocommunity  public default -V systemonly
rocommunity6 public default -V systemonly
```

将这两行修改为：

rwcommunity public
rwcommunity6 public default -V systemonly

保存并关闭文件。
重启SNMP服务以使配置更改生效：
```
sudo systemctl restart snmpd
```

以下是我的设备修改后的配置文件内容，小伙伴们可以参考一下：

###########################################################################
#
# snmpd.conf
# An example configuration file for configuring the Net-SNMP agent ('snmpd')
# See snmpd.conf(5) man page for details
#
###########################################################################
# SECTION: System Information Setup
#

# syslocation: The [typically physical] location of the system.
#   Note that setting this value here means that when trying to
#   perform an snmp SET operation to the sysLocation.0 variable will make
#   the agent return the "notWritable" error code.  IE, including
#   this token in the snmpd.conf file will disable write access to
#   the variable.
#   arguments:  location_string
sysLocation    Sitting on the Dock of the Bay
sysContact     Me <me@example.org>

# sysservices: The proper value for the sysServices object.
#   arguments:  sysservices_number
sysServices    72



###########################################################################
# SECTION: Agent Operating Mode
#
#   This section defines how the agent will operate when it
#   is running.

# master: Should the agent operate as a master agent or not.
#   Currently, the only supported master agent type for this token
#   is "agentx".
#   
#   arguments: (on|yes|agentx|all|off|no)

master  agentx

# agentaddress: The IP address and port number that the agent will listen on.
#   By default the agent listens to any and all traffic from any
#   interface on the default SNMP port (161).  This allows you to
#   specify which address, interface, transport type and port(s) that you
#   want the agent to listen on.  Multiple definitions of this token
#   are concatenated together (using ':'s).
#   arguments: [transport:]port[@interface/address],...

# agentaddress  127.0.0.1,[::1]
agentAddress udp:161,udp6:[::1]:161



###########################################################################
# SECTION: Access Control Setup
#
#   This section defines who is allowed to talk to your running
#   snmp agent.

# Views 
#   arguments viewname included [oid]

#  system + hrSystem groups only
view   systemonly  included   .1.3.6.1.2.1.1
view   systemonly  included   .1.3.6.1.2.1.25.1


# rocommunity: a SNMPv1/SNMPv2c read-only access community name
#   arguments:  community [default|hostname|network/bits] [oid | -V view]

# Read-only access to everyone to the systemonly view
#rocommunity  public default -V systemonly
#rocommunity6 public default -V systemonly
#rwcommunity public default -V systemonly
rwcommunity public 
rwcommunity6 public default -V systemonly

# SNMPv3 doesn't use communities, but users with (optionally) an
# authentication and encryption string. This user needs to be created
# with what they can view with rouser/rwuser lines in this file.
#
# createUser username (MD5|SHA|SHA-512|SHA-384|SHA-256|SHA-224) authpassphrase [DES|AES] [privpassphrase]
# e.g.
# createuser authPrivUser SHA-512 myauthphrase AES myprivphrase
#
# This should be put into /var/lib/snmp/snmpd.conf 
#
# rouser: a SNMPv3 read-only access username
#    arguments: username [noauth|auth|priv [OID | -V VIEW [CONTEXT]]]
rouser authPrivUser authpriv -V systemonly

同时可以看到，联系人和位置也是配置在这里的！！

基本设备信息查询

在本机使用SNMP工具查询本机的基本信息：

安装SNMP工具：首先，确保已经安装了SNMP工具。可以使用以下命令在Linux系统上进行安装：
```
sudo apt-get update
sudo apt-get install snmp
```
查询系统基本信息：使用SNMP工具的snmpget命令来查询系统的基本信息。下面是一些常用的OID（对象标识符）和对应的基本信息查询命令示例：

查询系统描述：

snmpget -v 2c -c public localhost SNMPv2-MIB::sysDescr.0

查询系统名称：

snmpget -v 2c -c public localhost SNMPv2-MIB::sysName.0

查询系统联系人：

snmpget -v 2c -c public localhost SNMPv2-MIB::sysContact.0

查询系统位置：

snmpget -v 2c -c public localhost SNMPv2-MIB::sysLocation.0

这些命令中的-v 2c表示使用SNMP版本2c，-c public表示使用默认的SNMP共同体字符串（通常为public）。localhost表示查询本地主机，也可以使用主机的IP地址进行查询。

root@armbian:~# snmpget -v 2c -c public localhost SNMPv2-MIB::sysDescr.0
SNMPv2-MIB::sysDescr.0 = STRING: Linux armbian 6.1.27-ophub #1 SMP Mon May  1 13:03:40 EDT 2023 aarch64
root@armbian:~# snmpget -v 2c -c public localhost SNMPv2-MIB::sysName.0
SNMPv2-MIB::sysName.0 = STRING: armbian
root@armbian:~# snmpget -v 2c -c public localhost SNMPv2-MIB::sysContact.0
SNMPv2-MIB::sysContact.0 = STRING: Me <me@example.org>
root@armbian:~# snmpget -v 2c -c public localhost SNMPv2-MIB::sysLocation.0
SNMPv2-MIB::sysLocation.0 = STRING: Sitting on the Dock of the Bay

系统的位置信息为"Sitting on the Dock of the Bay"。通常情况下，这个值是由系统管理员设置的，用于指示系统所在的位置。它可以是一个具体的地理位置，也可以是一个描述性的文本。在这种情况下，"Sitting on the Dock of the Bay"是一个象征性的值，代表系统的位置。

问题

Errors were encountered while processing: snmpd

运行sudo apt install snmp snmpd snmp-mibs-downloader后出现的问题

Processing triggers for man-db (2.9.4-2) ...
Errors were encountered while processing:
 snmpd

可能的原因和解决方法：

系统依赖问题：snmpd软件包可能依赖于其他软件包或库，而这些依赖项可能缺失或版本不兼容。你可以尝试运行以下命令修复依赖关系：
```
sudo apt --fix-broken install
```

然后再次运行安装SNMP服务的命令。

软件包损坏或下载问题：有时软件包可能下载不完整或损坏。你可以尝试清除已下载的软件包缓存，并重新运行安装命令：
```
sudo apt update
sudo apt clean
sudo apt install snmp snmpd snmp-mibs-downloader
```
网络连接问题：检查网络连接，确保设备已连接互联网，并且可以访问软件仓库。

Cannot adopt OID……

安装完成后可能遇到的问题

root@armbian:~# sudo systemctl status snmpd
● snmpd.service - Simple Network Management Protocol (SNMP) Daemon.
     Loaded: loaded (/lib/systemd/system/snmpd.service; enabled; vendor preset: enabled)
     Active: active (running) since Sat 2023-12-09 08:26:55 CST; 1min 57s ago
    Process: 116556 ExecStartPre=/bin/mkdir -p /var/run/agentx (code=exited, status=0/SUCCESS)
   Main PID: 116557 (snmpd)
      Tasks: 1 (limit: 4382)
     Memory: 4.9M
        CPU: 516ms
     CGroup: /system.slice/snmpd.service
             └─116557 /usr/sbin/snmpd -LOw -u Debian-snmp -g Debian-snmp -I -smux mteTrigger mteTriggerConf -f -p /run/snmpd.pid

Dec 09 08:26:55 armbian snmpd[116557]: Cannot adopt OID in NET-SNMP-AGENT-MIB: nsNotifyShutdown ::= { netSnmpNotifications 2 }
Dec 09 08:26:55 armbian snmpd[116557]: Cannot adopt OID in NET-SNMP-AGENT-MIB: nsNotifyRestart ::= { netSnmpNotifications 3 }
Dec 09 08:26:55 armbian snmpd[116557]: Cannot adopt OID in UCD-SNMP-MIB: laErrMessage ::= { laEntry 101 }
Dec 09 08:26:55 armbian snmpd[116557]: Cannot adopt OID in UCD-SNMP-MIB: laErrorFlag ::= { laEntry 100 }
Dec 09 08:26:55 armbian snmpd[116557]: Cannot adopt OID in UCD-SNMP-MIB: laLoadFloat ::= { laEntry 6 }
Dec 09 08:26:55 armbian snmpd[116557]: Cannot adopt OID in UCD-SNMP-MIB: laLoadInt ::= { laEntry 5 }
Dec 09 08:26:55 armbian snmpd[116557]: Cannot adopt OID in UCD-SNMP-MIB: laConfig ::= { laEntry 4 }
Dec 09 08:26:55 armbian snmpd[116557]: Cannot adopt OID in UCD-SNMP-MIB: laLoad ::= { laEntry 3 }
Dec 09 08:26:55 armbian snmpd[116557]: Cannot adopt OID in UCD-SNMP-MIB: laNames ::= { laEntry 2 }
Dec 09 08:26:55 armbian snmpd[116557]: Cannot adopt OID in UCD-SNMP-MIB: laIndex ::= { laEntry 1 }

snmpd 服务已经处于活动状态（active (running)），没有明显的错误或问题。
日志信息显示了一些警告消息，指出无法采用某些 OID。这些警告消息可能与缺少必要的 MIB（Management Information Base）文件有关。

安装 snmp-mibs-downloader 软件包：运行以下命令以安装 snmp-mibs-downloader 软件包：
```
sudo apt install snmp-mibs-downloader
```
使用 snmp-mibs-downloader 下载 MIB 文件：运行以下命令以下载 MIB 文件：
```
sudo download-mibs
```
重新启动 snmpd 服务：运行以下命令以重新启动 snmpd 服务：
```
sudo systemctl restart snmpd
```

完美解决

root@armbian:~# sudo systemctl status snmpd
● snmpd.service - Simple Network Management Protocol (SNMP) Daemon.
     Loaded: loaded (/lib/systemd/system/snmpd.service; enabled; vendor preset: enabled)
     Active: active (running) since Sat 2023-12-09 08:33:27 CST; 16s ago
    Process: 121820 ExecStartPre=/bin/mkdir -p /var/run/agentx (code=exited, status=0/SUCCESS)
   Main PID: 121821 (snmpd)
      Tasks: 1 (limit: 4382)
     Memory: 5.4M
        CPU: 201ms
     CGroup: /system.slice/snmpd.service
             └─121821 /usr/sbin/snmpd -LOw -u Debian-snmp -g Debian-snmp -I -smux mteTrigger mteTriggerConf -f -p /run/snmpd.pid

Dec 09 08:33:27 armbian systemd[1]: Starting Simple Network Management Protocol (SNMP) Daemon....
Dec 09 08:33:27 armbian systemd[1]: Started Simple Network Management Protocol (SNMP) Daemon..