Kubernetes and docker

Oct 1, 2015Download as pptx, pdf1 like961 views

Kubernetes is a cluster manager that schedules Docker containers across a cluster using pods. Pods are sets of Docker containers that are guaranteed to run on the same host. Replication controllers ensure that the desired number of pods for an application are running. Services provide a single IP address to load balance traffic to backend pods. Google Container Engine provides a hosted Kubernetes service. YAML files can be used to define replication controllers and services to deploy and expose applications on Kubernetes.

Docker
Idempotent builds
Images are portable
Containers should run a single application

Dockerfile
FROM ruby:2.2
MAINTAINER Eric Oestrich
ADD . /app
WORKDIR /app
RUN bundle install
CMD ["rails", "server"]

Kubernetes
Cluster manager
Schedules Docker containers

Pods
Set of docker containers that are guaranteed
to run on a host

Replication Controllers
Schedules pods to run
Set an amount of pods to run

Services
Load balancer
Single IP address to talk to backend pods

Google Container Engine
Hosted Kubernetes

Creating a Replication Controller
apiVersion: v1
kind: ReplicationController
metadata:
name: app
labels:
name: app

Creating a Replication Controller
spec:
replicas: 3
selector:
name: app
template:
metadata:
labels:
name: app

Creating a Replication Controller
spec:
template:
spec:
containers:
- name: rails
image: smartlogic/rails
imagePullPolicy: Always
ports:
- containerPort: 5000

Creating a Service
apiVersion: v1
kind: Service
metadata:
name: rails-app
labels:
name: rails-app
spec:
ports:
- port: 5000
selector:
name: rails-app

Viewing Pods (and RC and Services)
kubectl get pods
kubectl get replicationcontrollers
kubectl get services

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Kubernetes and docker

1. Kubernetes and Docker Eric Oestrich

2. Docker Idempotent builds Images are portable Containers should run a single application

3. Dockerfile FROM ruby:2.2 MAINTAINER Eric Oestrich ADD . /app WORKDIR /app RUN bundle install CMD ["rails", "server"]

4. Kubernetes Cluster manager Schedules Docker containers

5. Pods Set of docker containers that are guaranteed to run on a host

6. Replication Controllers Schedules pods to run Set an amount of pods to run

7. Services Load balancer Single IP address to talk to backend pods

8. Google Container Engine Hosted Kubernetes

9. Creating a Replication Controller apiVersion: v1 kind: ReplicationController metadata: name: app labels: name: app

10. Creating a Replication Controller spec: replicas: 3 selector: name: app template: metadata: labels: name: app

11. Creating a Replication Controller spec: template: spec: containers: - name: rails image: smartlogic/rails imagePullPolicy: Always ports: - containerPort: 5000

12. Creating a Service apiVersion: v1 kind: Service metadata: name: rails-app labels: name: rails-app spec: ports: - port: 5000 selector: name: rails-app

13. Viewing Pods (and RC and Services) kubectl get pods kubectl get replicationcontrollers kubectl get services

14. Questions?

Editor's Notes

#15: Matt to do this slide

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