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PHP IN THE CONTAINER CLOUD MARTIN HELMICH MITTWALD CM SERVICE GmbH & Co. KG SLAC2018, BERLIN MAY 7th, 2018

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This work is licensed under a Creative Commons Attribution- ShareAlike 4.0 International License. http://creativecommons.org/licenses/by-sa/4.0/

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MARTIN HELMICH SOFTWARE & SYSTEMS ARCHITECT @ MITTWALD CM SERVICE LECTURER @ PHWT VECHTA http://stackoverflow.com/story/martinhelmich https://github.com/martin-helmich https://www.martin-helmich.de

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CC-BY-SA, Atomic Taco https://www.flickr.com/photos/atomictaco/25016033688

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catdoc pdftotext

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catdoc pdftotext

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WHY DOCKER?

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WHY DOCKER? - EFFICIENCY - STANDARDIZED - STRONG COMMUNITY - DEVOPS SPIRIT & AUTOMATION

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KUBERNETES

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KUBERNETES - KUBER-WHAT!? - „GOOGLE SCALE“ - DEVOPS‘ DREAM

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POD - 1(ISH) CONTAINER - SHORT-LIVED - DISPOSABLE KUBERNETES CORE CONCEPTS

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apiVersion: v1 kind: Pod metadata: name: some-pod spec: containers: - name: web image: nginx ports: - containerPort: 80

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$ kubectl apply -f pod.yaml pod "some-pod" created $ kubectl get pods NAME READY STATUS some-pod 1/1 Running apiVersion: v1 kind: Pod metadata: name: some-pod spec: containers: - name: web image: nginx ports: - containerPort: 80

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KUBERNETES CORE CONCEPTS POD - 1(ISH) CONTAINER - SHORT-LIVED - DISPOSABLE REPLICA SET - MANAGES MULTIPLE PODS DEPLOYMENT - MANAGES MULTIPLE VERSIONS OF REPLICA SETS - ROLLING UPDATES/ ROLLBACKS SERVICE - STABLE DNS/ IP ADDRESS

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SPACES CONTAINER ARCHITECTURE DATABASE PODS (STATEFUL SET) CACHING PODS (REDIS; STATEFUL SET) APPLICATION PODS (CUSTOM IMAGE; DEPLOYMENT) LOGGING POD (NXLOG; DEPLOYMENT) MANAGEMENT (SALTSTACK; DEPLOYMENT) NETWORK FILESYSTEM (PERSISTENT VOLUME)

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$ kubectl scale deployment my-app --replicas=32 deployment "my-app" scaled $ kubectl get deployments NAME DESIRED CURRENT UP-TO-DATE AVAILABLE AGE my-app 32 32 32 15 30m $ kubectl get pods NAME READY STATUS RESTARTS AGE my-app-2035384211-7ci7o 1/1 Running 0 18s my-app-2035384211-kzszj 1/1 Running 0 18s my-app-2035384211-qqcnn 1/1 Running 0 18s …

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$ kubectl autoscale deployment my-app \ --min=4 --max=128 --cpu-percent=80 deployment "my-app" autoscaled

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BENEFITS CUSTOMER + PROVIDER • EFFICIENT RESOURCE UTILIZATION (NO OVERPROVISIONING) • FAST SCALE-UP & SCALE-DOWN • „ZERO-CONF“

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CHALLENGES

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PHP ON SCALE SLAC 2017: „PHP ON SCALE“ https://speakerdeck.com/martinhelmich/slac17-php-on-scale

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SHARED FILESYSTEM /fileadmin /typo3conf /typo3temp /uploads SOLUTION #1: CONFIGURE APPLICATION TO USE OBJECT STORE (S3, CEPH, …) AND CENTRALIZED CACHES SOLUTION #2: USE NETWORK FILESYSTEM (NFS, GLUSTER, CEPHFS, …)

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SCALING PHP APPS IS EASY… SCALING DATABASES IS NOT

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SCALABLE CACHING LAYER (RELATIVELY) FIXED-SCALE DATABASE

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DATABASE CLUSTER ORCHESTRATED BY VITESS VTGATE

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SIZING & SCHEDULING

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8 CPUS 64 GiB RAM KUBERNETES SCHEDULING THE NODE THE PODS REQUESTS LIMIT .5 CPU / 1 CPU 128 MiB/ 256 MiB LIMITS = REQUESTS -> GUARANTEED POD LIMITS > REQUESTS -> OVERCOMITTMENT SCHEDULING POD REQUESTS MUST FIT NODE POD LIMITS MAY BE LARGER THAN NODE CAPACITY LIMITS > CAPACITY -> OK

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KUBERNETES SETUP STORAGE ARCHITECTURE NETWORKING/ INGRESS APPLICATION ARCHITECTURE APPLICATION LIFECYCLE THE KUBERNETES ICEBERG

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QUESTIONS?

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