DEVIEW 2015 DAY1. packetbeat과 elasticsearch

1. Get real-time insights from your application with
Packetbeat & Elasticsearch

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This presentation contains
• Lots of JSON objects
• Pictures of cows, elks and
musical instruments
• A bit of Go code
• Anomaly detection via
moving averages

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Tudor Golubenco
twitter.com/tudor_g
github.com/tsg
I am

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I work for

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the company behind
Elasticsearch
Logstash
Kibana

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also known as
the
ELK
stack
Photo
credit:
https://www.flickr.com/photos/lsmith2010/8215026548

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Distributed from day 1
Logstash 1.5 release party

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Open source culture
Image
credit:
https://www.flickr.com/photos/tappnel/5798812875
• We live in GitHub
• We talk Pull Requests
• Conferences
• Community
• Blog posts

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That’s not all
Found Beats
Watcher ShieldMarvel
ES
for
Hadoop

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Started an open source project
Packetbeat

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We wanted to do
better monitoring and troubleshooting for
distributed systems

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Idea
look at the communication between
services

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Capture network packets
• Passively listen to network
packets
• Works on a copy of the
traffic
• It doesn’t add latency
• It cannot break your
application
Image
credit:
https://www.flickr.com/photos/bigdrumthump/3223280727

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Packet capturing
1.
Using
port
mirroring 2.
As
an
“agent”

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Sniffing from a technical PoV
• libpcap (tcpdump), supports
all Unix like systems
• Winpcap, supports Windows
• For Go, gopacket provides
bindings and more
• High speed API for packet
capturing on Linux:
af_packet
Image
credit:
https://www.flickr.com/photos/57881779@N04/7930362242/

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Decoding

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Matching requests and responses
• Pipelining complicates
matching the requests with
the responses.

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Create a JSON object for each request-response pair

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SQL example

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Memcache example

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DNS example

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• Control information: IP addresses, TCP/
UDP ports
• Request type: HTTP method, SQL query,
RPC function
• Request data: form parameters, payload
• Response data: status code, error
message, payload
• Timing data: timestamp of the request,
latency
Packet data

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Packetbeat: Overview

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There’s more to apps than packets
Packetbeat
Listens
to
the
“beat”
of
the
network
packets.
Topbeat
Listens
to
the
“beat”
of
the
operating
system
metrics.
Image
credits:
https://www.flickr.com/photos/7147684@N03/921738874/
https://www.flickr.com/photos/bigdrumthump/3223280727
https://www.flickr.com/photos/jadeashleyphotography/6584949945/
https://www.flickr.com/photos/mitosettembremusica/2839965900/
Filebeat
Listens
to
the
“beat”
of
logs.
Metricsbeat
Listens
to
the
internal
“beat”
of
systems
via
APIs.

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Topbeat
• Like the Unix top
command but
sending the data
periodically to
Elasticsearch
• Works also on
Windows

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Topbeat system wide and per process stats
CPU
“steal”
time
Total
/
used
/
free
memory
CPU
stats
Per
process
stats
CPU
time
consumed
Process
pid,
name,
parent
pid,
etc.
Memory
used

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Topbeat output objects
File
system
stats
Mount
point
Device
name
Total,
used,
free
disk
space

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Filebeat
• Do one thing well:
• Send log files to Logstash & Elasticsearch
• Light on consumed resources
• Easy to deploy on multiple platforms
• A “Beat” based on the Logstash-Forwarder
source code

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Beats have libbeat in common
• Go library
• Provides common things for all
Beats:
• logging, service handling,
configuration file handling,
CLI flags
• Outputs and filters
Dev
guide
for
creating
a
new
Beat:
https://www.elastic.co/guide/en/beats/libbeat/current/index.html

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Deployment: directly to ES
• Option 1: Insert
directly into
Elasticsearch via
the bulk API
• Security can be
provided via
Shield and HTTPs

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Deployment: Send to Logstash
• Option 2: Insert via
Logstash
• Uses the Lumberjack
protocol which offers
security
• Gives the opportunity of
enriching or modifying the
data

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Getting insights from the data
• Elasticsearch aggregations
• Split the data into
buckets
• Apply a function over the
data
• Freely combine them by
nesting
• Work with multiple shards

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Date histogram
•Splits data in buckets of time

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Date histogram response

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Percentiles aggregation
95th percentile value means that 95% of the
values are smaller than it

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Percentile aggregation response

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Percentile aggregation
•Approximate values
•T-digests algorithm by Ted Dunning
•Accurate for small sets of values
•More accurate for extreme percentiles

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Date histogram nested with percentiles

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Date histogram with nested percentiles

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Result

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Kibana config

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Latency histogram

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Histogram by response time
• Splits data in buckets by response time
• [0-10ms), [10ms-20ms), …

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Histogram by response time

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Add a date histogram

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Response times repartition

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Kibana config

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Slowest RPC methods
•Combines terms and percentiles aggregations

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Terms aggregation
• Buckets are dynamically built: one per unique value
• By default: top 10 by document count
• Approximate because each shard can have a different

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Order by 99th percentile

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Kibana config

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• New in Elasticsearch 2.0
(currently in beta)
• Work on the results of
other aggregations
Pipeline aggregations

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Derivative aggregation
• Metric
constantly
growing
• Take first order
derivate to see
the speed of
growth

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Simple moving average
• [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
• with a window size of 5:
• (1 + 2 + 3 + 4 + 5) / 5 = 3
• (2 + 3 + 4 + 5 + 6) / 5 = 4
• (3 + 4 + 5 + 6 + 7) / 5 = 5
• etc.

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Exponentially weighted moving average
• Older values become exponentially less important

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Moving average - dynamic thresholds
• yellow - measured values
• purple - moving average (ewma)
• green - threshold, mean + (3 * standard deviation)

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Request
Extended
stats
agg
for
mean
and
std
deviation
Moving
averages
aggs
for
mean
and
std
Bucket
script
agg
Details:
https://www.elastic.co/blog/staying-­‐in-­‐control-­‐with-­‐moving-­‐averages-­‐part-­‐1

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Cyclic trends - anomalies
• EWMA lags behind too much
• The values constantly hit the threshold

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Cyclic trends - anomalies
• Holt-Winters (triple exponential) model works better for
seasonal data
• Requires two periods to bootstrap the algorithm

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Thanks
• https://discuss.elastic.co/c/beats
• Twitter: @tudor_g
• We have stickers!