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Alternate SNMP plugin (#1389)

Browse Source 
* Add a new and improved snmp plugin

* update gosnmp for duplicate packet fix

https://github.com/soniah/gosnmp/issues/68
https://github.com/soniah/gosnmp/pull/69
This commit is contained in:
Patrick Hemmer
2016-08-22 11:37:53 -04:00
committed by Cameron Sparr
parent b022b5567d
commit 7fac74919c
9 changed files with 1671 additions and 1 deletions
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# SNMP Plugin
The SNMP input plugin gathers metrics from SNMP agents.
## Configuration:
### Example:
SNMP data:
```
.1.0.0.0.1.1.0 octet_str "foo"
.1.0.0.0.1.1.1 octet_str "bar"
.1.0.0.0.1.102 octet_str "bad"
.1.0.0.0.1.2.0 integer 1
.1.0.0.0.1.2.1 integer 2
.1.0.0.0.1.3.0 octet_str "0.123"
.1.0.0.0.1.3.1 octet_str "0.456"
.1.0.0.0.1.3.2 octet_str "9.999"
.1.0.0.1.1 octet_str "baz"
.1.0.0.1.2 uinteger 54321
.1.0.0.1.3 uinteger 234
```
Telegraf config:
```toml
[[inputs.snmp]]
agents = [ "127.0.0.1:161" ]
version = 2
community = "public"
name = "system"
[[inputs.snmp.field]]
name = "hostname"
oid = ".1.0.0.1.1"
is_tag = true
[[inputs.snmp.field]]
name = "uptime"
oid = ".1.0.0.1.2"
[[inputs.snmp.field]]
name = "loadavg"
oid = ".1.0.0.1.3"
conversion = "float(2)"
[[inputs.snmp.table]]
name = "remote_servers"
inherit_tags = [ "hostname" ]
[[inputs.snmp.table.field]]
name = "server"
oid = ".1.0.0.0.1.1"
is_tag = true
[[inputs.snmp.table.field]]
name = "connections"
oid = ".1.0.0.0.1.2"
[[inputs.snmp.table.field]]
name = "latency"
oid = ".1.0.0.0.1.3"
conversion = "float"
```
Resulting output:
```
* Plugin: snmp, Collection 1
> system,agent_host=127.0.0.1,host=mylocalhost,hostname=baz loadavg=2.34,uptime=54321i 1468953135000000000
> remote_servers,agent_host=127.0.0.1,host=mylocalhost,hostname=baz,server=foo connections=1i,latency=0.123 1468953135000000000
> remote_servers,agent_host=127.0.0.1,host=mylocalhost,hostname=baz,server=bar connections=2i,latency=0.456 1468953135000000000
```
#### Configuration via MIB:
This example uses the SNMP data above, but is configured via the MIB.
The example MIB file can be found in the `testdata` directory. See the [MIB lookups](#mib-lookups) section for more information.
Telegraf config:
```toml
[[inputs.snmp]]
agents = [ "127.0.0.1:161" ]
version = 2
community = "public"
[[inputs.snmp.field]]
oid = "TEST::hostname"
is_tag = true
[[inputs.snmp.table]]
oid = "TEST::testTable"
inherit_tags = "hostname"
```
Resulting output:
```
* Plugin: snmp, Collection 1
> testTable,agent_host=127.0.0.1,host=mylocalhost,hostname=baz,server=foo connections=1i,latency="0.123" 1468953135000000000
> testTable,agent_host=127.0.0.1,host=mylocalhost,hostname=baz,server=bar connections=2i,latency="0.456" 1468953135000000000
```
### Config parameters
* `agents`: Default: `[]`
List of SNMP agents to connect to in the form of `IP[:PORT]`. If `:PORT` is unspecified, it defaults to `161`.
* `version`: Default: `2`
SNMP protocol version to use.
* `community`: Default: `"public"`
SNMP community to use.
* `max_repetitions`: Default: `50`
Maximum number of iterations for repeating variables.
* `sec_name`:
Security name for authenticated SNMPv3 requests.
* `auth_protocol`: Values: `"MD5"`,`"SHA"`,`""`. Default: `""`
Authentication protocol for authenticated SNMPv3 requests.
* `auth_password`:
Authentication password for authenticated SNMPv3 requests.
* `sec_level`: Values: `"noAuthNoPriv"`,`"authNoPriv"`,`"authPriv"`. Default: `"noAuthNoPriv"`
Security level used for SNMPv3 messages.
* `context_name`:
Context name used for SNMPv3 requests.
* `priv_protocol`: Values: `"DES"`,`"AES"`,`""`. Default: `""`
Privacy protocol used for encrypted SNMPv3 messages.
* `priv_password`:
Privacy password used for encrypted SNMPv3 messages.
* `name`:
Output measurement name.
#### Field parameters:
* `oid`:
OID to get. May be a numeric or textual OID.
* `name`:
Output field/tag name.
If not specified, it defaults to the value of `oid`. If `oid` is numeric, an attempt to translate the numeric OID into a texual OID will be made.
* `is_tag`:
Output this field as a tag.
* `conversion`: Values: `"float(X)"`,`"float"`,`"int"`,`""`. Default: `""`
Converts the value according to the given specification.
- `float(X)`: Converts the input value into a float and divides by the Xth power of 10. Efficively just moves the decimal left X places. For example a value of `123` with `float(2)` will result in `1.23`.
- `float`: Converts the value into a float with no adjustment. Same as `float(0)`.
- `int`: Convertes the value into an integer.
#### Table parameters:
* `oid`:
Automatically populates the table's fields using data from the MIB.
* `name`:
Output measurement name.
If not specified, it defaults to the value of `oid`. If `oid` is numeric, an attempt to translate the numeric OID into a texual OID will be made.
* `inherit_tags`:
Which tags to inherit from the top-level config and to use in the output of this table's measurement.
### MIB lookups
If the plugin is configured such that it needs to perform lookups from the MIB, it will use the net-snmp utilities `snmptranslate` and `snmptable`.
When performing the lookups, the plugin will load all available MIBs. If your MIB files are in a custom path, you may add the path using the `MIBDIRS` environment variable. See [`man 1 snmpcmd`](http://net-snmp.sourceforge.net/docs/man/snmpcmd.html#lbAK) for more information on the variable.