openshift
  • container orchestration
  • kubernetes
  • architecture
  • key concepts
dockerfile
image
registry
kubernetes
deployment code, tooling
dockerfile
S2I
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openshift
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dockerfile
image
registry
kubernetes
deployment code, tooling

SWARM

Container Orchestration Engines (COE)

Features of  a COE

clustering

scheduling

load balancing

fault tolerance

scaling

app deployment

google

battle hardened

open

community

features

complex

zero to dev

non native

Features of  a k8s

clustering

scheduling

load balancing

fault tolerance

scaling

app deployment

Feature Concept
Colocation Pods
Scaling/Fault Tolerance replication controllers, replica sets
Load Balancing Services
App Deployment, Rollbacks deployments, rolling-updates
Stateful Apps stateful sets/ pet sets
configs, secrets config sets, secrets
app health checks liveness, readiness
logs and storage
monitoring

key concepts

projects

openshift
Project A
Project B
Project C

projects

stack = project
openshift
Project A
Project B
Project C

namespaces

stack = project
kubernetes
Project A
Project B
Project C

projects

quota
users and roles
network policies

pods

container

container

nginx
fsync
nginx
fsync

container

container

container

pod

debian
centos
nginx
fsync
eth0
10.0.4.25
  • process/pid namespace
  • root filesystem namespace
  • network namespace

  • hostname /uts namespace 
  • volumes

isolated

common

fsync
dst: /var/www/html
dst: /data
hostname = pod-xxx

A

K

M

S

PI Version

ind

etadata

pec

apiVersion: v1
kind: Pod
metadata:
  name: vote
  labels:
    app: voting
    role: ui
    tier: front
    env: dev
spec:
  containers:
    - name: vote
      image: schoolofdevops/vote:latest
      ports:
        - containerPort: 80

specs

deployments

app
replication 
controller
v1
v2
strategy
deployment / deployment config
deployment config (dc)
replication 
controller

pod spec
strategy
openshift
deploymen (deploy)
replicaSet

pod spec
strategy
kubernetes
apiVersion: apps/v1beta1
kind: Deployment
metadata:
  name: frontend-canary
  namespace: mogambo
spec:
  strategy:
    type: RollingUpdate
    rollingUpdate:
      maxUnavailable: 1
      maxSurge: 1
  replicas: 3
  minReadySeconds: 40
  revisionHistoryLimit: 4
  paused: false
  template:
    metadata:
      name: frontend
      labels:
        tier: "1"
        app: frontend
        env: dev
        release: canary
    spec:
      containers:
        - name: frontend
          image: schoolofdevops/frontend:v2.0
          ports:
            - containerPort: 8079
              protocol: TCP

deployment

replicaSet
strategy
pod spec

replication controllers

1
2
3
replication controllers
2
replication controllers
labels:
app: carts
version: v2.1
env: dev

labels:
app: ui
version: v5.0
env: dev

selector:
app: carts
env: dev

replicationController
selector:
app: carts
env: dev

replicaSet
selector:
app: carts
env: dev
version: [v1,v2, v3]

 

set based ( A AND B AND (x or y) )
A AND B AND C

OLD

NEW

Release Strategy
v1
v2
Rolling
Recreate
custom
svc.k8s.io

Service Discovery and publishing apps

app.project1.svc.cluster.local
10.30.45.76
app:80
Service
Endpoints
Cluster IP
Nodeport
Load Balancer
ExtIP
host:80
host:30000
cloud
with selectors
ELB
L4
L4
L4
L7
Route
ui.xyz.com
api.xyz.com
xyz.com/carts
DNS
api
deplyoment config
project
service, route
ConfigMaps and Secrets
Persistent Volumes
Network and CNI
Network Policies
RBAC
Horizontal Pod Autoscaler

additional concepts

Additional Controllers

additional controllers

1
2
3

deplyoment configs

daemon set

e.g. Monitoring/Logging Agents

app.xyz.com

stateful set

app.svc.ns.cluster

stateful set

app.svc.ns.cluster

cron

Jobs

architecture

KUBERNETES Architecture

kubectl

Scheduler

API Server

Controllers Manager

etcd

kubelet

kube-proxy

Master
Node 1
Node 2

Docker

kubelet

kube-proxy

Docker

etcd
managers
High Available Design
etcd
etcd
LB
kubectl, ui, api clients
storage 
log mgmt
monitoring
nodes

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