DevOps

How do I deploy?

Merge
Into
Master

Containers

application
+

dependencies

Stateless
Immutable

Create and destroy them to arbitrarily

Handy for: testing, deploying and rolling back

Kubernetes

What does it provide?

  • Replication
  • Load balancing
  • Logging
  • Monitoring ( application and resources )
  • Autoscaling
  • Service discovery/networking
  • Declarative configuration ( reproducible infrastructure )
  • Resource quotas
  • Mounting storage systems (also ceph, glusterfs,..)
  • Secrets
  • Rolling updates

Pod

Smallest unit
usually a single container
knows how to start itself
created and destroyed
has an IP

Pods are mortal

and their IP's cannot be relied upon to be stable over time

Enter Services

Service

a set of Pods
a policy on how to access them

Example

image processing backend

6 replicas

whatever uses it doesn't care about:

which instance it uses

how many instances there are

which instances are available

It just wants to resize
a damn image

Deployments

I want to roll out 6 replicas of the image processing backend

I now want 12, thanks

I want to roll out a new version

Oops a regression, roll back please

Deployments

ensure N pods are always running

declarative updates

Kompose

generate kubernetes config from docker-compose.yml

Our workflow

2. if master, push      image and then deploy

kubectl set image deploy/uplink uplink=eu.gcr.io/uplink-test-cluster-174313/uplink:$CIRCLE_SHA1
gcloud docker -- push eu.gcr.io/uplink-test-cluster-174313/uplink:$CIRCLE_SHA1

1. Build

How to deploy

How to rollback

How to scale

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