Automating stateful applications with kubernetes operators - Openstack Summit EU 2018

Automating with Operators
Marek Jelen
Red Hat
@marek_jelen
Jorge Morales
Red Hat
@jorgemoralespou

@jorgemoralespou / @marek_jelen
● OpenShift Developer Advocate @ Red Hat
● Python, Ruby, Java, PHP developer
● Automation and cloud specialist
● OpenShift Developer Advocate @ Red Hat
● Java developer
● Developer experience and devops fanboy
Marek Jelen Jorge Morales

● Why you should care about Operators
● What are Operators?
● How Operators work
● Building Operators
● Managing Operators
● Examples
● Installing OpenShift via Operators
What we’ll cover

Scaling stateless apps: Easy

$ kubectl scale deploy/staticweb --replicas=3

What about apps that… store data?
Or have their own notion of a “cluster”?
Databases?

Running a database is easy

$ kubectl run db --image=quay.io/my/db

Running it over time is harder

⏣ Resize/Upgrade
⏣ Reconfigure
⏣ Backup
⏣ Healing

Every application on any platform must
be installed, configured, managed, and
upgraded over time
Patching is critical to security

“Anything not automated is slowing
you down.”

If only k8s knew…

Grant Pequeño Hombre
MEET THIS
GUY

KNOWLEDGE
IN A BOX

PRODUCTION
READY DBs

Operators are automated software
managers for Kubernetes applications:
Install and Lifecycle

The recipe

Extend Kubernetes

Application-specific controllers that extend the Kubernetes
API to create, configure, and manage instances of complex
stateful applications on behalf of a Kubernetes user

kind: ProductionReadyDatabase
apiVersion: database.example.com/v1alpha1
metadata:
name: my-production-ready-database
spec:
clusterSize: 3
readReplicas: 2
version: v4.0.1
Extend the Kubernetes API through the Custom Resource
Definition (CRD) mechanism

Extend the Kubernetes API through the Custom Resource
Definition (CRD) mechanism
{
}

Reconciling desired state for your application
{
}

https://github.com/operator-framework

An Operator for Operators
OPERATOR
LIFECYCLE MANAGER

Over-the-air updates

https://github.com/operator-framework/awesome-operators

OPERATOR
MARKETPLACE

OPERATOR
METERING

Build your own operator

makes it easier to build Operators
OPERATOR
SDK

1.
Scaffolding and code generation to
bootstrap new projects

2.
Extension points that cover common
Operator use cases

3.
High level APIs and abstractions to
write operational logic

Step by step

1.
Create a new operator project using the
SDK Command Line Interface(CLI)
$ operator-sdk new prodready-db-operator
--api-version=database.example.com/v1alpha1
--kind=ProductionReadyDatabase

metadata:
spec:
clusterSize: 3
readReplicas: 2
version: v4.0.1
2.
Define new resource APIs by adding
Custom Resource Definitions(CRD)

3.
Specify resources to watch using the
SDK API
func main() {
printVersion()
sdk.Watch("database.example.com/v1alpha1",
"ProductionReadyDatabase",
"default",5)
sdk.handle(stub.newHandler())
sdk.Run(context.TODO())
}

4.
Define the operator reconciliation logic
in a designated handler and use the SDK
API to interact with resources

5.
Use the SDK CLI to build and generate
the operator and deployment manifests
$ operator-sdk generate k8s

6.
Deploy and run the operator in the
cluster
$ operator-sdk build example/prodreadydb:v0.0.1
$ docker push example/prodreadydb:v0.0.1
$ k apply -f deploy/rbac.yaml
$ k apply -f deploy/operator.yaml

7.
Deploy your own kubernetes
applications
$ cat <<EOF | k apply -f -
metadata:
spec:
clusterSize: 3
readReplicas: 2
version: v4.0.1
EOF

Taste it!

etcd Operator

etcd Operator
3.3.8
3.3.8
3.3.9

Database

Deploying OpenShift via Operators

DEMO
● Installer
○ Provision the infrastructure
○ Deploy temporary K8s cluster
○ Ignite the deployment process
● Operators
○ Do the rest ...

DEMO
cluster-kube-apiserver-operator*
cluster-kube-controller-manager-operator*
cluster-kube-scheduler-operator*
cluster-openshift-api-server-operator
cluster-openshift-controller-manager-operator
cluster-monitoring-operator
cluster-network-operator
cluster-dns-operator
cluster-ingress-operator
machine-api-operator
auth-config-operator
cluster-autoscaler-operator
cluster-node-tuning-operator
cluster-storage-operator
cluster-samples-operator
cluster-image-registry-operator
cluster-logging-operator
cluster-service-catalog-operator
console-operator
machine-config-operator
service-serving-cert-signer
olm-operator

Helpful resources

Resources
● Operator Framework and SDK on Github
https://github.com/operator-framework/
● Awesome Operators!
https://github.com/operator-framework/awesome-operators
● Introducing the Operator Framework
https://coreos.com/blog/introducing-operator-framework
● Make a Kubernetes Operator in 15 mins with Helm
https://blog.openshift.com/make-a-kubernetes-operator-in-15-minutes-with-hel
m/
● Kubernetes Custom Resources Grow up in v1.10.0
https://blog.openshift.com/kubernetes-custom-resources-grow-up-in-v1-10/

Coming Soon: Operators tutorials
OpenShift Learning Portal
http://learn.openshift.com

Automating with Operators
Jorge Morales
Red Hat
@jorgemoralespou
Marek Jelen
Red Hat
@marek_jelen
Thanks for attending

Automating stateful applications with kubernetes operators - Openstack Summit EU 2018

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