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@gianarb - gianluca@influxdb.com
Distributed monitoring
How to understand the chaos
@gianarb - gianluca@influxdb.com
Who Am I?
● Software Engineer passionate about almost everything atm I
work with Golang
● Open Source developer, Docker Captain and CNCF
Ambassador
● Site Reliability Engineer at InfluxData
● Speaker, blogger (gianarb.it) and so on...
● I love to travel, I grow my vegetables and I cook time to time
@gianarb - gianluca@influxdb.com
@gianarb - gianluca@influxdb.com
@gianarb - gianluca@influxdb.com
@gianarb - gianluca@influxdb.com
@gianarb - gianluca@influxdb.com
github.com/influxdata
@gianarb - gianluca@influxdb.com
What are you trying to say?
Microservices is not “The Distributed
System”
@gianarb - gianluca@influxdb.com
What are you trying to say?
A queue system can be distributed too...
@gianarb - gianluca@influxdb.com
What are you trying to say?
A multi threads application is a
distributed system
@gianarb - gianluca@influxdb.com
What are you trying to say?
More “it is distributed” across servers,
worlds, cloud providers and more
complex it is...
@gianarb - gianluca@influxdb.com
What are you trying to say?
Containers, Docker, Kubernetes, Cloud
Computing accelerated the application
distribution...
@gianarb - gianluca@influxdb.com
What are you trying to say?
Did you migrated to a distributed mess
without a real needs?
Blame yourself...
@gianarb - gianluca@influxdb.com
What are you trying to say?
A request rises and falls across multiple
applications before back to the user.
This is complexity.
@gianarb - gianluca@influxdb.com
Consequences
The logs are not easy to follow when
they comes from distributed applications,
it is not a single stream.
@gianarb - gianluca@influxdb.com
Consequences
Events and metrics
need to be correlated.
@gianarb - gianluca@influxdb.com
Distributed Tracing
Tracing is a way to correlate
logs using a set of IDs
@gianarb - gianluca@influxdb.com
@gianarb - gianluca@influxdb.com
Criticalities
We write applications in many different
languages
@gianarb - gianluca@influxdb.com
Criticalities
Across different teams
@gianarb - gianluca@influxdb.com
Criticalities
At the end, to build a trace we need to
agree on the same protocol no matters
the language or the team.
@gianarb - gianluca@influxdb.com
Distributed Tracing
Opentracing is a standard sponsored by the Cloud Native
Computing Foundation (CNCF) developed to agree on
common rules. It provides libraries across languages and you
can use many tracers open source and as a service.
© 2017 InfluxData. All rights reserved.24
OpenTracing
API
application logic
µ-service frameworks
Lambda functions
RPC & control-flow frameworks
existing instrumentation
tracing infrastructure
main()
I N S T A N A
J a e g e r
microservice process
© 2017 InfluxData. All rights reserved.25
>2 year old!
Tracer implementations: Zipkin, Jaeger, LightStep, SkyWalking, AWS X-Ray....
All sorts of companies use OpenTracing:
© 2017 InfluxData. All rights reserved.26
Rapidly growing OSS and vendor adoption
JDBIJava Webservlet
@gianarb - gianluca@influxdb.com
High Cardinality
A trace contains a lot of information and
they are indexed via request id (called
trace_id). They are expensive to store.
@gianarb - gianluca@influxdb.com
Distributed Tracing
Luckily traces doesn’t have a long lifecycle. Usually, you use
them to debug a problem happened almost in real time or in
short time window.
@gianarb - gianluca@influxdb.com
Distributed Tracing
We set a week as retention policy, after 7 days we
downsample and remove the original trace.
We also downsample them based on how many requests we
are receiving for a specific API call.
@gianarb - gianluca@influxdb.com
import opentracing "github.com/opentracing/opentracing-go"
import zipkin "github.com/openzipkin/zipkin-go-opentracing"
collector, err := zipkin.NewHTTPCollector(tracingConf.ZipkinEndpoint)
recorder := zipkin.NewRecorder(collector, false,
fmt.Sprintf("0.0.0.0:%d", tracingConf.Port), "restapi")
tracer, err = zipkin.NewTracer(
recorder,
zipkin.ClientServerSameSpan(false),
zipkin.TraceID128Bit(false),
)
opentracing.SetGlobalTracer(tracer)
@gianarb - gianluca@influxdb.com
import opentracing "github.com/opentracing/opentracing-go"
tracer := opentracing.GlobalTracer()
sp := tr.StartSpan(“api.create_user”)
defer sp.Finish()
@gianarb - gianluca@influxdb.com
opentracing.io
@gianarb - gianluca@influxdb.com
Distributed Tracing
@gianarb - gianluca@influxdb.com
@gianarb - gianluca@influxdb.com
Distributed Tracing - Collect traces via Telegraf
@gianarb - gianluca@influxdb.com
@gianarb - gianluca@influxdb.com
@gianarb - gianluca@influxdb.com
No UI at the moment. :(
SELECT * FROM zipkin WHERE time < now() - 1h
AND trace_id = ‘a4hs45hs46jd56j4s’
@gianarb - gianluca@influxdb.com
The process of understanding
1. Instrument
2. Observe
3. Aggregate and sample
4. Take action (via alerts or whatever)
@gianarb - gianluca@influxdb.com
How people and teams play this game?
They should deploy their application.
@gianarb - gianluca@influxdb.com
How people and teams play this game?
Be on-call and they should take care
about production behavior for their
applications
@gianarb - gianluca@influxdb.com
How people and teams play this game?
They can write a “presentation” of their
service (a doc): critical metrics, capacity
planning (cpu, ram, disk intensive app), service
location in the system (close to other apps, ssd)
@gianarb - gianluca@influxdb.com
How people and teams play this game?
Keep everyone in the loop and
responsible for the real traffic.
There is not fun writing code without
running it in production!
@gianarb - gianluca@influxdb.com
How people and teams play this game?
Every tools we develop exposes APIs,
developers can use them.
Eg. Create runtime alerts with Kapacitor.
@gianarb - gianluca@influxdb.com
Servers/Containers/VMs are not pets
1. They don’t have name because they come and go based
on loads and needs.
2. You can’t watch cute servers’s picture on Instagram. Yet..
3. A server has labels.
@gianarb - gianluca@influxdb.com
Servers/Containers/VMs are not pets
Write tools that helps you to replace servers and processes
or use available projects like AWS Autoscaling group,
Kubernetes and so on.
DevOps is an attitude is not a role that you hire. They are
developer passionate about server automation and related
stuff.
@gianarb - gianluca@influxdb.com
@gianarb - gianluca@influxdb.com
@gianarb - gianluca@influxdb.com
We care about state and event
1. Use created
2. Invoice generation
3. Email sent
4. Purchase
5. Whatever...
@gianarb - gianluca@influxdb.com
We care about data!
But data is all another
topic!
@gianarb - gianluca@influxdb.com
Back to tracing - the cost of a retry
@gianarb - gianluca@influxdb.com
Distributed Tracing - the cost of a retry
@gianarb - gianluca@influxdb.com
Wrap up!
● Monitor distributed system is hard and you need to
correlate all the things
● Opentracing and distributed tracing
● Keep people in the loop and give ownership of production
● DevOps is an attitude
● Servers/Containers/Processes are not pet
● Application state and events
● Listen to your system and have fun
@gianarb - gianluca@influxdb.com
Collect data is just the
beginning
Aggregation, alerting, downsampling are other
important steps to answer a question

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