• Zabbix SNMP OID discovery,自动发现


    Unlike file system and network interface discovery, the item does not necessarily have to have “snmp.discovery” key - item type of SNMP agent is sufficient.

    The OIDs to discover are defined in SNMP OID field in the following format: discovery[{#MACRO1}, oid1, {#MACRO2}, oid2, …,]

    where {#MACRO1}{#MACRO2} … are valid lld macro names and oid1oid2… are OIDs capable of generating meaningful values for these macros. A built-in macro {#SNMPINDEX} containing index of the discovered OID is applied to discovered entities. The discovered entities are grouped by {#SNMPINDEX} macro value.

    To understand what we mean, let us perform few snmpwalks on our switch:

    $ snmpwalk -v 2c -c public 192.168.1.1 IF-MIB::ifDescr
    IF-MIB::ifDescr.1 = STRING: WAN
    IF-MIB::ifDescr.2 = STRING: LAN1
    IF-MIB::ifDescr.3 = STRING: LAN2
    
    $ snmpwalk -v 2c -c public 192.168.1.1 IF-MIB::ifPhysAddress
    IF-MIB::ifPhysAddress.1 = STRING: 8:0:27:90:7a:75
    IF-MIB::ifPhysAddress.2 = STRING: 8:0:27:90:7a:76
    IF-MIB::ifPhysAddress.3 = STRING: 8:0:27:2b:af:9e
    

    And set SNMP OID to: discovery[{#IFDESCR}, ifDescr, {#IFPHYSADDRESS}, ifPhysAddress]

    Now this rule will discover entities with {#IFDESCR} macros set to WANLAN1 and LAN2, {#IFPHYSADDRESS} macros set to 8:0:27:90:7a:758:0:27:90:7a:76, and 8:0:27:2b:af:9e, {#SNMPINDEX} macros set to the discovered OIDs indexes 12 and 3:

    {
        "data": [
            {
                "{#SNMPINDEX}": "1",
                "{#IFDESCR}": "WAN",
                "{#IFPHYSADDRESS}": "8:0:27:90:7a:75"
            },
            {
                "{#SNMPINDEX}": "2",
                "{#IFDESCR}": "LAN1",
                "{#IFPHYSADDRESS}": "8:0:27:90:7a:76"
            },
            {
                "{#SNMPINDEX}": "3",
                "{#IFDESCR}": "LAN2",
                "{#IFPHYSADDRESS}": "8:0:27:2b:af:9e"
            }
        ]
    }

    If an entity does not have the specified OID, then the corresponding macro will be omitted for this entity. For example if we have the following data:

    ifDescr.1 "Interface #1"
    ifDescr.2 "Interface #2"
    ifDescr.4 "Interface #4"
    
    ifAlias.1 "eth0"
    ifAlias.2 "eth1"
    ifAlias.3 "eth2"
    ifAlias.5 "eth4"

    Then in this case SNMP discovery discovery[{#IFDESCR}, ifDescr, {#IFALIAS}, ifAlias] will return the following structure:

    {
        "data": [
            {
                "{#SNMPINDEX}": 1,
                "{#IFDESCR}": "Interface #1",
                "{#IFALIAS}": "eth0"
            },
            {
                "{#SNMPINDEX}": 2,
                "{#IFDESCR}": "Interface #2",
                "{#IFALIAS}": "eth1"
            },
            {
                "{#SNMPINDEX}": 3,
                "{#IFALIAS}": "eth2"
            },
            {
                "{#SNMPINDEX}": 4,
                "{#IFDESCR}": "Interface #4"
            },
            {
                "{#SNMPINDEX}": 5,
                "{#IFALIAS}": "eth4"
            }
        ]
    }

    建立snmp discovery 规则,SNMP OID:discovery[{#IFDESCR},IF-MIB::ifDescr],

    意思就是 snmpget 所有 IF-MIB::ifDescr 的值存放在 #IFDESCR 这个Marco(宏)里面,按照 #SNMPINDEX=1,2,3 排列存储。

    The following screenshot illustrates how we can use these macros in item prototypes:

    创建 Item Prototypes规则,name里面的 $1 参数就是 key 里面传回的第一个参数,也就是 Discovery rule里面获得的 #IFDESCR 【对应#SNMPINDEX】的值。

    返回的真实值就是:snmpget 的 SNMP OID 里面的IF-MIB::ifInOctets.{#SNMPINDEX}的值,SNMP community 对应的是添加主机时候设置的团体名。

    当然也可以自己用snmpwalk命令一一指定要监控的某个具体的端口。

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  • 原文地址:https://www.cnblogs.com/fatt/p/8434656.html
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