Kubernetes 有状态集群服务部署与管理

1 .Kubernetes有状态集群服务 部署与管理 时速云：张寿红 

2 .

3 . Agenda • Background • Kubernetes Stateful Service Features • What is Kubernetes? • Init Container • Run stateful services • Pet Set on Kubernetes • Kubernetes Storage • Run MySQL Cluster on Kubernetes • Volume • Galera MySQL Introduction • Persistent Volume • Deploy MySQL Cluster with PetSet • Dynamic Storage • Cluster Operation on Kubernetes Provision 

4 .What is Kubernetes 

5 .What is Kubernetes 

6 .What is Kubernetes 

7 .What is Kubernetes Cattle Pet 

8 .Run Stateful Service on Kubernetes • Stateless services are popular in containerized world because they are disposable and easy to be re-created with container images. • Beyond stateless services like web server, users are increasingly deploying stateful services with containers to benefit from “build once, run anywhere” and to improve bare metal efficiency/utilization. • These “pets” bring new requirements including longer life cycle, configuration dependencies and stateful failover. Container orchestration must address these needs to successfully deploy and scale apps. 

9 .Run Stateful Service on Kubernetes Stateless Stateful Clustered • Pod • Volume • Pet Set • RC／Replica Set • Persistent • Init Container • Service Volume • Headless Service • Dynamic Storage Provision 

10 . Agenda • Background • Kubernetes Stateful Service Features • What is Kubernetes? • Init Container • Run stateful services • Pet Set on Kubernetes • Kubernetes Storage • Run MySQL Cluster on Kubernetes • Volume • Galera MySQL Introduction • Persistent Volume • Deploy MySQL Cluster with PetSet • Dynamic Storage • Cluster Operation on Kubernetes Provision 

11 . Kubernetes Storage • Node Based Volume • emptyDir • hostPath • Use Cases： • Store temp data • Data sharing among containers 

12 . Kubernetes Storage • emptyDir • hostPath 

13 . Kubernetes Storage • Cross Node Volume 

14 .Kubernetes Storage Kubernetes Cluster Node Node Node C C C C C C C C C C C C Various volume plugins Shared Volume Unshared Volume • nfs • emptyDir • hostPath • hostPath • glusterfs • gcePersistentDisk • flocker • awsElasticBlockStore • cephfs • iscsi • secret • rbd • vsphereVirtualDisk • azureFileVolume 

15 . Kubernetes Storage • Add your volume plugin 

16 . Kubernetes Storage • Persistent Volume & Persistent Volume Claim • PV/PVC abstracts details of how storage is provided from how it is consumed. • PV/PVC are API resources. • PVs are volume plugins like Volumes, but have a lifecycle independent of any individual pod that uses the PV. 

17 . Kubernetes Storage • PV Access Modes 

18 . Kubernetes Storage • PV Lifecycle Releasin Provisioning Binding Using g Reclaiming Retain Static Delete Dynamic Recycle Available Bound Released Failed 

19 . Kubernetes Storage • PV Provision & Binding Process 

20 . Kubernetes Storage • Dynamic Storage Provision kind: StorageClass kind: StorageClass apiVersion: apiVersion: storage.k8s.io/v1beta1 storage.k8s.io/v1beta1 metadata: metadata: name: slow name: fast provisioner: kubernetes.io/gce- provisioner: pd kubernetes.io/gce-pd parameters: parameters: type: pd-standard type: pd-ssd 

21 . Kubernetes Storage • Dynamic Storage Provision "kind": "PersistentVolumeClaim", "spec": { "apiVersion": "v1", "accessModes": [ "metadata": { "ReadWriteOnce" "name": "claim1", ], "annotations": { "resources": { "requests": { "volume.beta.kubernetes.io/storage- "storage": "30Gi" class": "fast" } } } }, } This claim will result in an SSD-like Persistent Disk being automatically provisioned. When the claim is deleted, the volume will be destroyed. 

22 . Agenda • Background • Kubernetes Stateful Service Features • What is Kubernetes? • Init Container • Run stateful services • Pet Set on Kubernetes • Kubernetes Storage • Run MySQL Cluster on Kubernetes • Volume • Galera MySQL Introduction • Persistent Volume • Deploy MySQL Cluster with PetSet • Dynamic Storage • Cluster Operation on Kubernetes Provision 

23 . Init Container • What is Init Container • Sequentially executed containers in a pod • Initialize shared volumes • Always run to completion • Used on a pod, replica set, deployment, daemon set, pet set or job. Pod … Primary Init Container 1 Init Container 2 Container Shared Volumes 

24 . Init Container • Why Init Container • Waiting for other components to be available • Performing configuration • Registering the pod into a central database • Downloading application dependencies • … 

25 .Init Container 

26 . Pet Set • Pet vs Pod Pet Pod Stateful Stateless Identit No y Identity Complex Simple 

27 . Pet Set Pet PV/PVC Stable Storage • No Cluster IP Network Headless • DNS Record Identity Service Creation Ordinal Index Pet Set 

28 . Pet Set • PetSet Operations • Peer discovery • Scaling a PetSet • Image upgrades • Deleting a PetSet 

29 . Agenda • Background • Kubernetes Stateful Service Features • What is Kubernetes? • Init Container • Run stateful services • Pet Set on Kubernetes • Kubernetes Storage • Run MySQL Cluster on Kubernetes • Volume • Galera MySQL Introduction • Persistent Volume • Deploy MySQL Cluster with PetSet • Dynamic Storage • Cluster Operation on Kubernetes Provision