115 lines
6.0 KiB
Markdown
115 lines
6.0 KiB
Markdown
# SFlow Input Plugin
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The SFlow Input Plugin provides support for acting as an SFlow V5 collector in
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accordance with the specification from [sflow.org](https://sflow.org/).
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Currently only Flow Samples of Ethernet / IPv4 & IPv4 TCP & UDP headers are
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turned into metrics. Counters and other header samples are ignored.
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#### Series Cardinality Warning
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This plugin may produce a high number of series which, when not controlled
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for, will cause high load on your database. Use the following techniques to
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avoid cardinality issues:
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- Use [metric filtering][] options to exclude unneeded measurements and tags.
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- Write to a database with an appropriate [retention policy][].
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- Limit series cardinality in your database using the
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[max-series-per-database][] and [max-values-per-tag][] settings.
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- Consider using the [Time Series Index][tsi].
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- Monitor your databases [series cardinality][].
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- Consult the [InfluxDB documentation][influx-docs] for the most up-to-date techniques.
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### Configuration
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```toml
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[[inputs.sflow]]
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## Address to listen for sFlow packets.
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## example: service_address = "udp://:6343"
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## service_address = "udp4://:6343"
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## service_address = "udp6://:6343"
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service_address = "udp://:6343"
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## Set the size of the operating system's receive buffer.
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## example: read_buffer_size = "64KiB"
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# read_buffer_size = ""
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```
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### Metrics
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- sflow
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- tags:
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- agent_address (IP address of the agent that obtained the sflow sample and sent it to this collector)
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- source_id_type(source_id_type field of flow_sample or flow_sample_expanded structures)
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- source_id_index(source_id_index field of flow_sample or flow_sample_expanded structures)
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- input_ifindex (value (input) field of flow_sample or flow_sample_expanded structures)
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- output_ifindex (value (output) field of flow_sample or flow_sample_expanded structures)
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- sample_direction (source_id_index, netif_index_in and netif_index_out)
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- header_protocol (header_protocol field of sampled_header structures)
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- ether_type (eth_type field of an ETHERNET-ISO88023 header)
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- src_ip (source_ipaddr field of IPv4 or IPv6 structures)
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- src_port (src_port field of TCP or UDP structures)
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- src_port_name (src_port)
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- src_mac (source_mac_addr field of an ETHERNET-ISO88023 header)
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- src_vlan (src_vlan field of extended_switch structure)
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- src_priority (src_priority field of extended_switch structure)
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- src_mask_len (src_mask_len field of extended_router structure)
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- dst_ip (destination_ipaddr field of IPv4 or IPv6 structures)
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- dst_port (dst_port field of TCP or UDP structures)
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- dst_port_name (dst_port)
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- dst_mac (destination_mac_addr field of an ETHERNET-ISO88023 header)
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- dst_vlan (dst_vlan field of extended_switch structure)
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- dst_priority (dst_priority field of extended_switch structure)
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- dst_mask_len (dst_mask_len field of extended_router structure)
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- next_hop (next_hop field of extended_router structure)
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- ip_version (ip_ver field of IPv4 or IPv6 structures)
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- ip_protocol (ip_protocol field of IPv4 or IPv6 structures)
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- ip_dscp (ip_dscp field of IPv4 or IPv6 structures)
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- ip_ecn (ecn field of IPv4 or IPv6 structures)
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- tcp_urgent_pointer (urgent_pointer field of TCP structure)
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- fields:
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- bytes (integer, the product of frame_length and packets)
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- drops (integer, drops field of flow_sample or flow_sample_expanded structures)
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- packets (integer, sampling_rate field of flow_sample or flow_sample_expanded structures)
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- frame_length (integer, frame_length field of sampled_header structures)
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- header_size (integer, header_size field of sampled_header structures)
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- ip_fragment_offset (integer, ip_ver field of IPv4 structures)
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- ip_header_length (integer, ip_ver field of IPv4 structures)
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- ip_total_length (integer, ip_total_len field of IPv4 structures)
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- ip_ttl (integer, ip_ttl field of IPv4 structures or ip_hop_limit field IPv6 structures)
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- tcp_header_length (integer, size field of TCP structure. This value is specified in 32-bit words. It must be multiplied by 4 to produce a value in bytes.)
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- tcp_window_size (integer, window_size field of TCP structure)
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- udp_length (integer, length field of UDP structures)
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- ip_flags (integer, ip_ver field of IPv4 structures)
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- tcp_flags (integer, TCP flags of TCP IP header (IPv4 or IPv6))
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### Troubleshooting
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The [sflowtool][] utility can be used to print sFlow packets, and compared
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against the metrics produced by Telegraf.
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```
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sflowtool -p 6343
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```
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If opening an issue, in addition to the output of sflowtool it will also be
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helpful to collect a packet capture. Adjust the interface, host and port as
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needed:
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```
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$ sudo tcpdump -s 0 -i eth0 -w telegraf-sflow.pcap host 127.0.0.1 and port 6343
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```
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[sflowtool]: https://github.com/sflow/sflowtool
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### Example Output
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```
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sflow,agent_address=0.0.0.0,dst_ip=10.0.0.2,dst_mac=ff:ff:ff:ff:ff:ff,dst_port=40042,ether_type=IPv4,header_protocol=ETHERNET-ISO88023,input_ifindex=6,ip_dscp=27,ip_ecn=0,output_ifindex=1073741823,source_id_index=3,source_id_type=0,src_ip=10.0.0.1,src_mac=ff:ff:ff:ff:ff:ff,src_port=443 bytes=1570i,drops=0i,frame_length=157i,header_length=128i,ip_flags=2i,ip_fragment_offset=0i,ip_total_length=139i,ip_ttl=42i,sampling_rate=10i,tcp_header_length=0i,tcp_urgent_pointer=0i,tcp_window_size=14i 1584473704793580447
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```
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[metric filtering]: https://github.com/influxdata/telegraf/blob/master/docs/CONFIGURATION.md#metric-filtering
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[retention policy]: https://docs.influxdata.com/influxdb/latest/guides/downsampling_and_retention/
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[max-series-per-database]: https://docs.influxdata.com/influxdb/latest/administration/config/#max-series-per-database-1000000
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[max-values-per-tag]: https://docs.influxdata.com/influxdb/latest/administration/config/#max-values-per-tag-100000
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[tsi]: https://docs.influxdata.com/influxdb/latest/concepts/time-series-index/
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[series cardinality]: https://docs.influxdata.com/influxdb/latest/query_language/spec/#show-cardinality
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[influx-docs]: https://docs.influxdata.com/influxdb/latest/
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