Unleash software architecture leveraging on docker

Adrien Blind
DevOps Coach & Docker captain
@adrienblind
Unleash software architecture
leveraging on Docker

@adrienblind
Fine-grained, highly decoupled and
atomic purpose centric services
Designed
for failure
Multi-versioned
Scalable
Microservices characteristics
Stateless
Immutable
Continuously
delivered

@adrienblind
From Enterprise Services buses
to full-mesh topologies
ESB
Service Service Service
Service Service
>
ServiceService
Service
Service
Service
Interactions
App App

@adrienblind
Security paradigms shifts (1/2)
Your IT opens up
• Externalization (housing, hosting)
• Cloud (IaaS/PaaS/SaaS)
Open up your IS
• B2B, services exposition
• Multi tenancy
More & more breaches appears in your Great Wall of China!

@adrienblind
Security paradigms shifts (2/2)
The necessary porosity of your IS requires to stick
security closer to each application: sandbox your apps
and expose protected interfaces!
Network is part of application topology
Security is an app topic, not just infra. concern
Onboard security in feature teamSecDevOps

@adrienblind
 Apps designed for failure & scalability
 Data to be externalized
 Dumber infrastructure
Resilience & scalability: apps problem now!
 Structured: MongoDB, Hadoop, Cassandra, Elastic Search...
 Binaries: object storage with Ceph, OpenStack Swift...
 Helpful patterns: stateless, multi-versioning, loose coupling...
 Infrastructure rationalization
 Low-cost, poor-SLA commodity
Vertical > Horizontal

@adrienblind
Merge app & infra conf. lifecycles
System conf v.5.79
Middleware v.69.3
App code v1.2.3
 Product version = app version +
infra version
 Whenever you change a single
line of code or a system lib., you
build up a new artifact
More & more full stack & immutable

@adrienblind
 PaaS offers can offload several
topics
 …But it requires you to stick to their
paradigms which may creates locks
& limitations
 … and may delays adoption of new
practices/fmk/…
What about the PaaS ?

@adrienblind
IaaSCapacity (VM, Storage, Netwk…)
PaaSApp. (code)
CaaSContainer
What about the CaaS

@adrienblind
Docker fits microservice paradigms
‘’A universal, self-sufficient and standard artifact embedding an app module,
and its subsequent infrastructure configuration’’
 Docker provides both the artifact and the ecosystem to handle it!
Immutable
Portable
Lightweight
Versionned/taggedContinuously
delivered
Full stack

@adrienblind
App
From containers to apps
An application is made of several components
interacting each together

@adrienblind
Distributed application
Compute (service/task)
Storage (volume) Transport (network)
Topology
(compose, bundle,
deploy, stack)
 Docker shifted from container infra. to object-oriented app. topologies
CaaS platform
Clustering (swarm)
Image mgmt
(registry)
Hosting (node)
Provisioning (machine)
... relying on an CaaS platform 
The rise of the orchestration

@adrienblind
Docker 1.12 swarm mode
 Directly over Internet ?
 Swarm mode secures interactions between its nodes (TLS mutual auth, authz, & encryption)
 Overlay network trafic may be encrypted across nodes too (use switch --opt encrypted to use IPSEC)
 Built in the engine
 Decentralized
 More secured
 More resilient

@adrienblind
$ docker-machine create -d virtualbox m1
$ docker swarm init --advertise-addr [m1_ip]
$ docker-machine create -d virtualbox m2
$ eval $(docker-machine env m2)
$ docker swarm join --token [mytoken] [m1_ip]:2377
--advertise-addr [m2_ip]
$ docker swarm join-token worker
To add a worker to this swarm, run the following command:
docker swarm join
--token [TOKEN] [m1_ip]:2377
… (joined a third manager, plus a worker)
$ docker node ls
ID HOSTNAME STATUS AVAILABILITY MANAGER STATUS
1o46ikaidagi91w940h81byd1 w1 Ready Active
3bboy53bjyeqd9ad0tsegju51 m2 Ready Active Reachable
48yqo4607pfzkpct4jz9t1t9y m3 Ready Active Reachable
6fyvwd6cc4nguth29ycexaxat * m1 Ready Active Leader
Cluster setup example

@adrienblind
Docker service
Depicts the desired runtime behavior of a given
image : networking, resiliency, quotas...  shift to
state-machine paradigms
$ docker service create --name front -–network app
–-replicas 3 -p 80:80/tcp myapi:latest
Attach the containers to a given network
Define the desired amount of instances for this service (named « tasks »)
Attach each instance to a transversal L4 loadbalancer instance, reachable on
each node of the cluster

@adrienblind
Example
$ docker network create --driver overlay myappnet
$ docker service create --name mybackenddb --env
MYSQL_ROOT_PASSWORD=plop --env MYSQL_DATABASE=plop
--network myappnet mysql:latest
$ docker service create --name myapi --env DB_HOST=mybackenddb
--env DB_PASSWORD=passwd env DB_NAME=plop --network myappnet
--publish 80:80 --replicas 3 myapi:latest
$ docker service ls
ID NAME REPLICAS IMAGE COMMAND
14utiklw5g6s mybackenddb 1/1 mysql:latest
c9vnvebcylg5 myapi 3/3 myapi:latest
$ docker service update --replicas 7 myapi

@adrienblind
Example
LB LB LB LB
Network
Dynamic LB on each
manager + workers
hosting containers of
the app
All containers
belonging to a same
app are connected
through an overlay
network
App dedicated overlay network
myapi
myapi myapi myapimybackenddb

@adrienblind
Docker stack (experimental)
docker-compose enabled to depicts and
trigger a complete app topology from the client
side
docker stack enables to feed the server-
side orchestrator with a complete app topology

@adrienblind
 It’s all about a devops story: part of the infra
aspects are integrated in the app’s side, the
rest is commoditized
 CaaS approach offers a good balance between
the value of the PaaS and autonomy of IaaS
Conclusion

@adrienblind
 What
 Formerly about abstracting low layers (ie.
infra) : close to PaaS approach
 Now more related to FaaS/event-driven
programming (like AWS Lambdas).
Consider app=data+transformation
 Why / Pros
 Cost saving: avoid running permanently a
server « waiting » for requests
 Industrialize your own platform, stop
reinventing the wheel, avoid pure cloud
vendors lock-in (ie w/ AWS lambdas for
instance)
Serverless / Event-driven prg.
OpenWhisk frameworkGoogle Trend results for
« serverless »
Client
API
Gateway
Search
Compute
Something
DB
Auth

Adrien Blind
DevOps Coach & Docker captain
@adrienblind
Thank you!

Unleash software architecture leveraging on docker

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Unleash software architecture leveraging on docker