Upgrade to Pro
— share decks privately, control downloads, hide ads and more …
Speaker Deck
Features
Speaker Deck
PRO
Sign in
Sign up for free
Search
Search
Stateful Applications mit Kubernetes
Search
Nicolas Byl
September 21, 2017
Technology
0
63
Stateful Applications mit Kubernetes
Nicolas Byl
September 21, 2017
Tweet
Share
More Decks by Nicolas Byl
See All by Nicolas Byl
Die Flucht aus der Prototypen-Hölle
nbyl
0
41
Lean Prototyping for Industrial-IoT Projects
nbyl
0
38
DevSecOps - Vom Unikum zur gut geölten Maschine
nbyl
0
91
Securing your software supply chain
nbyl
0
350
Keeping-Up-WithUpstream.pdf
nbyl
0
150
Dr. Kube und der Helm - Anatomie einer CD-Pipeline
nbyl
0
110
Securing the "other" supply chain
nbyl
0
250
Kubernetes - Auf die Cluster, Fertig, Los!
nbyl
0
170
Helm - Kubernetes Deployments richtig gemacht
nbyl
0
120
Other Decks in Technology
See All in Technology
Lazy application authentication with Tailscale
bluehatbrit
0
210
How Do I Contact HP Printer Support? [Full 2025 Guide for U.S. Businesses]
harrry1211
0
120
AWS認定を取る中で感じたこと
siromi
1
190
Backlog ユーザー棚卸しRTA、多分これが一番早いと思います
__allllllllez__
1
150
CDKTFについてざっくり理解する!!~CloudFormationからCDKTFへ変換するツールも作ってみた~
masakiokuda
1
150
Yahoo!しごとカタログ 新しい境地を創るエンジニア募集!
lycorptech_jp
PRO
0
110
AI時代の開発生産性を加速させるアーキテクチャ設計
plaidtech
PRO
3
160
成長し続けるアプリのためのテストと設計の関係、そして意思決定の記録。
sansantech
PRO
0
120
関数型プログラミングで 「脳がバグる」を乗り越える
manabeai
1
190
開発生産性を組織全体の「生産性」へ! 部門間連携の壁を越える実践的ステップ
sudo5in5k
2
7.2k
MobileActOsaka_250704.pdf
akaitadaaki
0
130
Delta airlines®️ USA Contact Numbers: Complete 2025 Support Guide
airtravelguide
0
340
Featured
See All Featured
Templates, Plugins, & Blocks: Oh My! Creating the theme that thinks of everything
marktimemedia
31
2.4k
GraphQLの誤解/rethinking-graphql
sonatard
71
11k
GraphQLとの向き合い方2022年版
quramy
49
14k
Build your cross-platform service in a week with App Engine
jlugia
231
18k
Producing Creativity
orderedlist
PRO
346
40k
A better future with KSS
kneath
238
17k
The Cost Of JavaScript in 2023
addyosmani
51
8.5k
Designing for Performance
lara
610
69k
Practical Orchestrator
shlominoach
189
11k
個人開発の失敗を避けるイケてる考え方 / tips for indie hackers
panda_program
107
19k
Documentation Writing (for coders)
carmenintech
72
4.9k
How To Stay Up To Date on Web Technology
chriscoyier
790
250k
Transcript
STATEFUL APPLICATIONS MIT KUBERNETES BED-CON 2017 Nicolas Byl, codecentric AG
1
2
PERSISTENT APPLICATION STATE 3 . 1
GOALS Scalable Highly Available Fault Tolerance 3 . 2
EXAMPLE ARCHITECTURE 3 . 3
CANDIDATES MySQL PostgreSQL Cassandra MongoDB Kafka … 3 . 4
KUBERNETES 4 . 1
DESIGN PHILOSOPHY portable: public, private, hybrid, multi-cloud extensible: modular, pluggable,
hookable, composable self-healing: auto-placement, auto-restart, auto-replication, auto-scaling 4 . 2
PODS 4 . 3
SERVICES 4 . 4
PERSISTENT VOLUMES 5 . 1
5 . 2
GCEPersistentDisk CephFS AWSElasticBlockStore Cinder (OpenStack block storage) AzureFile Glusterfs AzureDisk
VsphereVolume FC (Fibre Channel) Quobyte Volumes FlexVolume HostPath Flocker VMware Photon
NFS vPortworx Volumes iSCSI ScaleIO Volumes RBD (Ceph Block Device)
StorageOS 5 . 3
ACCESS MODES ReadWriteOnce – the volume can be mounted as
read-write by a single node ReadOnlyMany – the volume can be mounted read-only by many nodes ReadWriteMany – the volume can be mounted as read-write by many nodes 5 . 4
USAGE Provision Disk Create Persistent Volume Create Persistent Volume Claim
Mount Claim in Pod 5 . 5
PERSISTENT VOLUME apiVersion: v1 kind: PersistentVolume metadata: name: pv0003 spec:
capacity: storage: 5Gi accessModes: - ReadWriteOnce persistentVolumeReclaimPolicy: Recycle nfs: path: /tmp server: 172.17.0.2 5 . 6
PERSISTENT VOLUME CLAIM kind: PersistentVolumeClaim apiVersion: v1 metadata: name: myclaim
spec: accessModes: - ReadWriteOnce resources: requests: storage: 8Gi 5 . 7
MOUNTING A PVC kind: Pod apiVersion: v1 metadata: name: mypod
spec: containers: - name: mydatabase image: mysql:5.7 volumeMounts: - mountPath: "/var/lib/mysql" name: mypd volumes: - name: mypd persistentVolumeClaim: claimName: myclaim 5 . 8
COMMON PITFALLS The abstraction is leaky. Local storage vs. SAN
storage vs. Network Filesystems 5 . 9
AUTO-PROVISIONING 6 . 1
AUTO-PROVISIONING Manual creation of Persistent Volumes is error-prone. Does not
scale well. 6 . 2
STORAGECLASS kind: StorageClass apiVersion: storage.k8s.io/v1 metadata: name: standard provisioner: kubernetes.io/aws-ebs
parameters: type: gp2 6 . 3
USING A STORAGECLASS kind: PersistentVolumeClaim apiVersion: v1 metadata: name: myclaim
spec: accessModes: - ReadWriteOnce resources: requests: storage: 8Gi storageClassName: standard 6 . 4
SUPPORTED PROVISIONERS default volume plugins (in-tree provisioners) out-of-tree provisioners community
provisioners: write your own: https://github.com/kubernetes- incubator/external-storage https://github.com/kubernetes- incubator/external- storage/tree/master/docs/demo/hostpath-provisioner 6 . 5
SCALING 7 . 1
ARCHITECTURE REVISITED 7 . 2
SHARING PVCS Need different paths per Pod. Share needs to
be available on every host. Corruption of file system affects all database nodes. Sharing a Persistent Volume Claim is not a good idea. 7 . 3
STATEFUL SETS 8 . 1
STATEFULSETS Pod template mechanism Hostnames are atomically increased: pod-0 pod-1
… Volume Claims can be provisioned on-the-fly 8 . 2
STATEFULSET EXAMPLE apiVersion: apps/v1beta1 kind: StatefulSet metadata: name: web spec:
serviceName: "nginx" replicas: 2 template: metadata: labels: app: nginx spec: containers: - name: nginx image: gcr.io/google_containers/nginx-slim:0.8 ports: - containerPort: 80 name: web volumeMounts: 8 . 3
ARCHITECTURE STATEFULSETS 8 . 4
WRAP UP 9 . 1
LINKS Persistent Volumes: Tutorial StatefulSet: Demos: https://kubernetes.io/docs/concepts/storage/persistent- volumes https://kubernetes.io/docs/tutorials/stateful-application/basic- stateful-set/
https://goo.gl/NCnzq8 9 . 2
THE END Copyright 2017 @NicolasByl 9 . 3