Power Saturday 2019 B2 - Running stateful(set) applications like SQL Server in K8s

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Power
Saturday
Running Stateful(set) applications like SQL
Server in K8s
David Barbarin

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3 communautés pour partager,
échanger et apprendre
Power BI, Data, IA, Power Platform, Office 365, SharePoint, etc.

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> whoami
Architecture, Performance and high availability
David Barbarin
Principal Consultant
@mikedavem
David Barbarin
Blog

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❖Container, what’s that?
❖Orchestration to the rescue
❖Stateful(set)
Agenda

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❖Kubernetes
Orchestration to the rescue
▪ 2003-2004: Birth of the Borg project
▪ 2013: From Borg to Omega
▪ 2014: Google introduces K8s
▪ 2015: The year of Kube v1.0 & CNCF K8s v1.0
▪ 2016: K8s goes to mainstream (v1.2 -> 1.5)
Helm / Minikube
First Stateful support
▪ 2017: K8s v1.6 as a stabilization release
RBAC(Beta),autoprovisioning StorageClass
K8s v1.7 Local Storage support
Containerd integration
ECS (AWS), AKS (Azure), GKE (Google)
K8s v1.11 -> v1.13
▪ 2019: K8s v1.14
Windows as worker node in K8s

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Orchestration to the rescue
POD
Worker node
POD
Worker node
Service
- Type: loadbalancer, nodePort, clusterIP
- Selector
- Source port : target port
- Endpoints
Kube-proxy
Master node Master node Master node API server
etcd
Scheduler
Affinity / anti-affinity
Labels
Worker node resource availability
Others …
Controller manager
Namespace controller
Pod controller
Service controller
…
DESIRED STATE
kubelet kubelet
health
Control plane

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❖Stateful = Dealing with persistence
Stateful(set)
Pod

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❖Stateful = Dealing with persistence
Stateful(set)
/var/opt/mssql
Pod
Persistent volume (PV)
▪ - Provisioner
▪ - StorageClass
▪ - Options
▪ - Reclaim policy
▪ - Static vs Dynamic provisioning
Persistent volume claim (PVC)
▪ - Access mode = RWO, ROM, RWM
▪ - Storage size
/var/opt/mssql
Pod
▪ Capabilities depend on storage plugin / providers
▪ Internal (in-tree) / (out-of-tree) external provisioners
▪ Access mode = RWO / ROM / RWM
▪ ReclaimPolicy = Retained / Delete

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❖Why StatefulSet?
Stateful(set)
Worker node Worker node Worker node
MSSQL-1 MSSQL-2 MSSQL-3
Replica Replica Replica
ReplicaSet Replica controller
Deployment
Kubectl scale <replicaset> --replicas=3

14. @ClubPowerBI @aosComm @GUSS_FRANCEPower Saturday 2019
❖Why StatefulSet?
Stateful(set)
Worker node Worker node Worker node
MSSQL-1 MSSQL-2 MSSQL-3
Replica Replica Replica
ReplicaSet Replica controller
Deployment
Kubectl scale <replicaset> --replicas=3

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Merci!