Docker Container Orchestration

DOCKER CONTAINER ORCHESTRATION

Fernand Galiana

My Requirements

• Micro Service support

• Multi node deploys + Docker

• Multi ports TCP/UDP/HTTP

• DNS like support across cluster

• Deploy target: AWS

• Rolling updates

• Easy to grasp

• Community support

• Tooling

Whoosh!

Been All Around The World…

• Apache Mesos

• Docker Swarm

• ECS

• Kubernetes

• Deis

• Fleet

• Helios

Why Kubernetes?

• Flexibility

• Rest API

• Cluster orchestration

• Tooling

• Self healing

• Open source

• Not Vendor centric

• DockerCompose like

• Contributors 560+

• Community

• Google

CONCEPTS

K8S

• Node

• Pod

• Replication Controller

• Service

• Volume

• Namespace

• Label

• Annotation

Nodes

Master

Minion1 Minion2 Minion…

Nodes

Minion-1 Minion-2 Minion-n

MasterREST API

Pod

• Collocated Containers

• Same host

• Coupling

• Shared volume

• Ephemeral

Pod Definition

kind: Pod apiVersion: v1 metadata: name: nginx spec: containers: - name: nginx image: nginx ports: - containerPort: 80

ngnix.yml

Deploy!

kubectl create -f ngnix.yml

Labels

• Key/Value Tagging

• May Change during lifetime

• 63 chars alpha(-/_/.)

Label It!

kind: Pod apiVersion: v1 metadata: name: nginx labels: app: nginx spec: containers: - name: nginx image: nginx ports: - containerPort: 80

Find it!

kubectl get pods -l app=nginx

Annotations

• Similar to labels

• !Selectors

• Track build#, versions

Replication Controller

• Pod Cloning

• Pod Supervisor

Selectors

• =,!=

• in, notin, exists, !exists

• , == AND

ReplicationControllerkind: ReplicationController apiVersion: v1 metadata: name: nginx-controller spec: replicas: 2 selector: app: nginx template: metadata: labels: app: nginx spec: containers: - name: nginx image: nginx ports: - containerPort: 80

ReplicationControllerkind: ReplicationController apiVersion: v1 metadata: name: nginx-controller spec: replicas: 2 selector: app: nginx template: metadata: labels: app: nginx spec: containers: - name: nginx image: nginx ports: - containerPort: 80

MUST MATCH!!

Deploy!

kubectl create -f nginx-rc

GREAT NOW WHAT?

Services

• Logical set of pods

• Decoupling between pods and pod’s clients

• Pod(s) endpoint

• HaProxy on steroids (TCP, UDP, HTTP)

• Can point to !k8s endpoint (subsets)

• Virtual IP

• Services must exits before pods

• {SVC}SERVICE_HOST/{SVC}_SERVICE_PORT

Services

App2

App3

App1

4567

4567

4567

app=fred

KubeProxy

IpTables

ApiServer

Client

app=fred

app=fred

Volumes

• Outlive container’s crash

• Medium: Dir|Memory

• Types: emptyDir|hostPath|NFS|EBS|gitRepo,…

• Specify mount point

Persistent Volumes

• Persistent volume (PV)

• Persistent volume claim (PVC)

Secrets

• OAUTH Tokens

• User/Pwd

DEMO

Demo

New Features

• Daemon Sets

• Deployments

• Ingress Ressources

• Horizontal Pods

• Jobs

Resources

• kubernetes.io

• github.com/kubernetes/kubernetes

SAY HELLO TO MY LITTLE FRIEND…

THOUGHTS?THANK YOU!!