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Introduction to Container Storage
1.
Introduction to Container
Storage Day of Cloud Native Oslo, 20 March 2018 Cheryl Hung, Product Manager © StorageOS Ltd.
2.
2© StorageOS Ltd. Cheryl Product
manager, StorageOS Cloud Native London @oicheryl @oicheryl
3.
Objectives •Why is state
so tricky? •How should I compare storage? •What storage should I use with Kubernetes? 3 @oicheryl © StorageOS Ltd.
4.
Objectives •Why is state
so tricky? •How should I compare storage? •What storage should I use with Kubernetes? Anti-objective: •Should I use a database/message queue/key-value store... for my app? 4 @oicheryl © StorageOS Ltd.
5.
Prerequisites Sign up at
https://demo.storageos.cloud if you want to try my demos. kubectl configured for a two node Kubernetes 1.8 cluster. Run kubectl get nodes to check. 5 @oicheryl © StorageOS Ltd.
6.
Why is state
so tricky? 6© StorageOS Ltd.
7.
Why do I
need storage? @oicheryl © StorageOS Ltd.
8.
8 @oicheryl © StorageOS Ltd. Why
do I need storage?
9.
First challenge: No
storage pets 9 @oicheryl © StorageOS Ltd.
10.
Second challenge: Data
needs to follow 10 @oicheryl © StorageOS Ltd.
11.
Third challenge: Humans
are fallible 11 @oicheryl © StorageOS Ltd.
12.
How should I
compare storage? 12© StorageOS Ltd.
13.
From the CNCF
Landscape @oicheryl © StorageOS Ltd.
14.
@oicheryl
15.
15 Eight Principles of Cloud
Native Storage
16.
What is Cloud
Native? Horizontally scalable No single point of failure Resilient and self healing Minimal operator overhead Decoupled from the underlying platform 16 @oicheryl © StorageOS Ltd.
17.
Eight principles of
Cloud Native Storage Storage should be presented to and consumed by applications, not by operating systems or hypervisors 1 Application centric @oicheryl © StorageOS Ltd.
18.
Eight principles of
Cloud Native Storage Storage should be presented to and consumed by applications, not by operating systems or hypervisors The storage platform should be able to run anywhere. Upgrades and scaling is non-disruptive. 1 Application centric 2 Platform agnostic @oicheryl © StorageOS Ltd.
19.
Eight principles of
Cloud Native Storage Storage should be presented to and consumed by applications, not by operating systems or hypervisors The storage platform should be able to run anywhere. Upgrades and scaling is non-disruptive. Storage resources should be declared and composed just like all other resources required by applications and services. 1 Application centric 2 Platform agnostic 3 Declarative & composable @oicheryl © StorageOS Ltd.
20.
Eight principles of
Cloud Native Storage Storage should be presented to and consumed by applications, not by operating systems or hypervisors The storage platform should be able to run anywhere. Upgrades and scaling is non-disruptive. Storage resources should be declared and composed just like all other resources required by applications and services. Storage resources and services should be easy to be provisioned, consumed, moved and managed via an API. 1 Application centric 2 Platform agnostic 3 Declarative & composable 4 API driven @oicheryl © StorageOS Ltd.
21.
Eight principles of
Cloud Native Storage 5 Natively secure Storage services should integrate and inline security features such as encryption and RBAC. @oicheryl © StorageOS Ltd.
22.
Eight principles of
Cloud Native Storage 5 Natively secure 6 Agile Storage services should integrate and inline security features such as encryption and RBAC. The platform should be able to move application data between locations, dynamically resize and snapshot volumes. @oicheryl © StorageOS Ltd.
23.
Eight principles of
Cloud Native Storage 5 Natively secure 6 Agile 7 Performant Storage services should integrate and inline security features such as encryption and RBAC. The platform should be able to move application data between locations, dynamically resize and snapshot volumes. The storage platform should offer deterministic performance in complex distributed environments. @oicheryl © StorageOS Ltd.
24.
Eight principles of
Cloud Native Storage 5 Natively secure 6 Agile 7 Performant 8 Consistently available Storage services should integrate and inline security features such as encryption and RBAC. The platform should be able to move application data between locations, dynamically resize and snapshot volumes. The storage platform should offer deterministic performance in complex distributed environments. The storage platform should ensure high availability, durability, consistency with a predictable, proven data model. @oicheryl © StorageOS Ltd.
25.
What storage should
I use with Kubernetes? 25© StorageOS Ltd.
26.
@oicheryl Kubernetes Storage Model:
Persistent Volumes and Claims © StorageOS Ltd. Registers PVs in the pool Pool of Persistent Volumes NFS PV iSCSI PV NFS PV GCE PV Administrator
27.
@oicheryl Kubernetes Storage Model:
Persistent Volumes and Claims © StorageOS Ltd. Registers PVs in the pool Claims a PV from the pool claim Pool of Persistent Volumes NFS PV iSCSI PV NFS PV GCE PV Administrator Developer
28.
@oicheryl Kubernetes Storage Model:
Persistent Volumes and Claims © StorageOS Ltd. claim Registers PVs in the pool Claims a PV from the pool References claim in pod claim Pool of Persistent Volumes NFS PV iSCSI PV NFS PV Pod GCE PV Administrator Developer
29.
@oicheryl Dynamic provisioning with
Storage Classes © StorageOS Ltd. Registers Storage Classes Storage Classes NS PVstandard fast Administrator
30.
@oicheryl Dynamic provisioning with
Storage Classes © StorageOS Ltd. Registers Storage Classes claim Storage Classes NS PVslowfast Administrator Developer Claims a PV from the pool
31.
@oicheryl Dynamic provisioning with
Storage Classes © StorageOS Ltd. claim Registers Storage Classes References claim in pod claim Storage Classes NS PV Pod slowfast Administrator Developer Claims a PV from the pool fast PV
32.
@oicheryl © StorageOS Ltd.
33.
@oicheryl Meet Jane © StorageOS
Ltd. •A DevOps engineer at a media company •Migrating client Wordpress websites into Kubernetes •Wants to follow the cloud native principles
34.
Proliferating plugins © StorageOS
Ltd. @oicheryl
35.
Proliferating plugins © StorageOS
Ltd. @oicheryl
36.
Key information 1. What
is my use case? 2. What are my performance requirements? 3. How should developers access storage? 4. Where is the storage deployed and managed? @oicheryl © StorageOS Ltd.
37.
1. What is
my use case? 37 App binaries App data Config Backup @oicheryl © StorageOS Ltd.
38.
2. What are
my performance requirements? 38 App binaries Ephemeral App data Latency, availability, performant Config Shared Backup Cost efficient, cloud @oicheryl © StorageOS Ltd.
39.
@oicheryl 3. How should
developers access storage? © StorageOS Ltd. Block Fixed-size ‘blocks’ in a rigid arrangement – ideal for enterprise databases File ‘Files’ in hierarchically nested ‘folders’ – ideal for active documents Object ‘Objects’ in scalable ‘buckets’ – ideal for unstructured big data and archiving
40.
4. Where is
the storage deployed and managed? ●CO supports one or more Interfaces to interact with the Storage System ●Storage System can (A) support control-plane interface API directly and interact directly with the CO or can (B) interact with the CO via an API framework layer or other Tools. ●Storage system must support the ability to provision and consume (C) volumes through a standard interface to be considered Interoperable ●Workloads interact (C) with storage systems over various data-plane methods Cluster Orchestrators Control-Plane Interfaces (CSI, DVDI, Flex, Native) Storage SystemsFrameworks and Tools AB B Workloads C © StorageOS Ltd. @oicheryl
41.
@oicheryl Jane’s storage requirements ©
StorageOS Ltd. •Postgres database for application data •Database location, credentials •Database and website backups •User uploaded media
42.
Database location and
credentials © StorageOS Ltd. @oicheryl 1. Use case? Configuration 2. Performance requirements? Shared across instances 3. Access? Kubernetes provides Secrets for sensitive data such as passwords, and ConfigMap for arbitrary config. Both can be accessed by the application through environment variables 4. Deployed and managed? Tight integration with Kubernetes
43.
User uploaded media ©
StorageOS Ltd. @oicheryl 1. Use case? Shared media 2. Performance requirements? Large blobs of data, shared across pods 3. Access? Shared filesystem 4. Deployed and managed? Cloud: Managed NFS, or object store if the app can support it On prem: Distributed FS (not NFS)
44.
Database and website
backup © StorageOS Ltd. @oicheryl 1. Use case? Backup and archival 2. Performance requirements? Durability, cost, snapshots 3. Access? Object store 4. Deployed and managed? Cloud: Managed object store, long term cold storage On prem: Object store (not NAS)
45.
Postgres for application
data © StorageOS Ltd. @oicheryl 1. Use case? Transactional database 2. Performance requirements? High availability, low latency, deterministic performance 3. Access? Database connector 4. Deployed and managed? Cloud: Cloud volumes (watch out for attach/detach times, compliance) or managed db (limited offerings) On prem: Software defined storage
46.
Software-defined storage -
StorageOS @oicheryl © StorageOS Ltd.
47.
High availability with
StorageOS @oicheryl © StorageOS Ltd.
48.
Workshop
49.
@oicheryl Kubernetes Persistent App
demo - Rocket.Chat © StorageOS Ltd.
50.
@oicheryl Kubernetes Persistent App
demo - Rocket.Chat © StorageOS Ltd. github.com/oicheryl/k8s-storage-tutorial 1. Install Helm 2. Install Rocket.Chat with MongoDB, backed by GCE PVs 3. Delete the pod running MongoDB 4. Kubernetes will restart the pod and show the data was persisted.
51.
51 To Recap…
52.
Storage principles 1 Application centric 2
Platform agnostic 3 Declarative/ composable 4 API driven 5 Natively secure 6 Agile 7 Performant 8 Consistently available © StorageOS Ltd. @oicheryl 1. Use case? 2. Performance requirements? 3. Access? 4. Deployed and managed?
53.
CSI launched as
alpha in Kubernetes 1.9 @oicheryl © StorageOS Ltd.
54.
Browser-based demo • demo.storageos.cloud Quickstart •
storageos.com/kubernetes @oicheryl StorageOS resources © StorageOS Ltd.
55.
Thanks Slides at oicheryl.com ©
StorageOS Ltd.
56.
What is StorageOS? ©
StorageOS Ltd. @oicheryl
57.
What is StorageOS? ©
StorageOS Ltd. @oicheryl Platform agnostic Horizontally scalable Database (ie. block) Docker/K8s integration High availability
58.
StorageOS architecture @oicheryl © StorageOS
Ltd.
59.
StorageOS architecture © StorageOS
Ltd. @oicheryl StorageOS is conceptually pretty simple; it’s a virtualization layer on top of any commodity or cloud storage. It’s deployed as one container per node, similar to a DaemonSet. 1. Nodes contribute local block storage to the storage pool. 2. Virtual volumes (block storage formatted with a standard filesystem) are created using the StorageOS volume plugin. 3. Any pods can mount the virtual volumes from any node. If a pod is rescheduled to a different node, StorageOS simply redirects reads and writes so the pod can continue to access the storage.
60.
StorageOS architecture © StorageOS
Ltd. @oicheryl It’s designed to scale horizontally by adding more nodes. New nodes contribute their storage into the storage pool, or, if they don’t have storage themselves, can access storage on other nodes.
61.
High availability with
StorageOS © StorageOS Ltd. @oicheryl
62.
High availability with
StorageOS © StorageOS Ltd. @oicheryl StorageOS uses a hybrid master/replica architecture, where replicas are distributed across nodes. Replication is very simple in StorageOS. Volume D is created with two replicas. StorageOS creates the replicas (D2, D3) and schedules them to two different nodes (N3, N5). Incoming writes to D are synchronously replicated to D2 and D3, ie. writes are not persisted until acknowledged by both replicas. If N1 fails, one of D2 or D3 gets promoted to master, providing instant failover and no interruption of service. StorageOS creates and resyncs a new replica on N2 or N4 in the background.
63.
StorageOS: A modular
enterprise storage solution in a container 63 • Manages data access requests • Pools aggregate storage for presentation • Runs as a container DATA PLANE • Manages config, health, scheduling, policy, provisioning and recovery • API is accessed by plugins, CLI, GUI • Runs as a container CONTROL PLANE © 2013-2017 StorageOS Ltd. All rights reserved.
64.
More reading Download the
technical architecture overview at storageos.com/storageos-platform-architecture-overview. Try out in your browser, with zero downloads or configuration: demo.storageos.cloud Full documentation at docs.storageos.com.
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