KubernetesのPetSetsの話

社内コンテナ勉強会で喋った機能。
PetSetsを使うことで、従来のStatefulなアプリケーションもKubernetes上で動かしやすくなります

Transcript

1. LTͷ1FU4FUTͷ࿩
   

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2. Kazuto Kusama
   @jacopen
   

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3. ࠷ۙͷ࿩
   ࠷ۙͷ๻͕΍ͬͯΔϓϩδΣΫτͰɺͳΜͱ͔ελοΫͷͳΜͱ͔
   ͍ͬͯ͏΍ͭΛ࢖͍ͬͯΔͷͰɺRabbitMQ͕ඞཁʹͳͬͨ
   ӡ༻ج൫ʹk8sΛ࢖͍ͬͯΔΜͰɺRabbitMQΫϥελΛk8sʹ૊΋͏
   

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4. k8sͰී௨ʹ্͛ͨ৔߹

   (Deployments, Replication Controller)
   kind: Deployment
   metadata:
   name: rabbitmq
   spec:
   replicas: 3
   template:
   metadata:
   labels:
   app: rabbitmq
   spec:
   containers:
   - name: rabbitmq
   image: rabbitmq:latest
   

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5. k8sͰී௨ʹ্͛ͨ৔߹

   (Deployments, Replication Controller)
   jacopen@ssh2:~/kubernetes$ kubectl get pods
   NAME READY STATUS RESTARTS AGE
   rabbitmq-4239234776-8bs65 1/1 Running 0 2m
   rabbitmq-4239234776-amzjt 1/1 Running 0 2m
   rabbitmq-4239234776-wq6s4 1/1 Running 0 2m
   

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6. MQ MQ MQ
   3ඖͷRabbitMQ
   

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7. MQ MQ MQ
   3ඖͷRabbitMQ
   ΫϥελΛ૊ΜͰΈΑ͏
   

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8. $ rabbitmqctl join_cluster rabbit@rabbitmq-0
   OR
   rabbitmq.config
   [
   {
   rabbit, [
   {loopback_users, []},
   {cluster_nodes, {[‘rabbit@rabbitmq-0', 'rabbit@rabbitmq-1'],
   ram}}
   ]
   }
   ].
   

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9. MQ MQ MQ
   ΄ɺϗετ໊ɾɾɾ
   rabbitmq-4239234776-8bs65 rabbitmq-4239234776-amzjt rabbitmq-4239234776-wq6s4
   ܾ·ͬͨϗετ໊ʹͳΒͳ্͍ʹɺ૬ޓͷ௨৴खஈ͕ͳ͍
   

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10. MQ MQ MQ
    ແཧ໼ཧk8sͰ࣮ݱ
    rabbitmq-4239234776-8bs65 rabbitmq-4239234776-amzjt rabbitmq-4239234776-wq6s4
    Service
    rabbitmq-0
    Service
    rabbitmq-1
    Service
    rabbitmq-2
    

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11. MQ MQ MQ
    ແཧ໼ཧk8sͰ࣮ݱ
    rabbitmq-4239234776-8bs65 rabbitmq-4239234776-amzjt rabbitmq-4239234776-wq6s4
    Service
    rabbitmq-0
    Service
    rabbitmq-1
    Service
    rabbitmq-2
    

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12. MQ MQ MQ
    yaml஍ࠈ
    rabbitmq-4239234776-8bs65 rabbitmq-4239234776-amzjt rabbitmq-4239234776-wq6s4
    Service
    rabbitmq-0
    Service
    rabbitmq-1
    Service
    rabbitmq-2
    yaml
    yaml
    yaml
    yaml
    yaml
    yaml
    

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13. MQ MQ MQ
    ϝϯςͷͨΊʹఀࢭ͠Α͏
    $ kubectl delete -f …
    rabbitmq-4239234776-8bs65 rabbitmq-4239234776-amzjt rabbitmq-4239234776-wq6s4
    Service
    rabbitmq-0
    Service
    rabbitmq-1
    Service
    rabbitmq-2
    yaml
    yaml
    yaml
    yaml
    yaml
    yaml
    

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14. ϝϯςͷͨΊʹఀࢭ͠Α͏
    rabbitmq-4239234776-8bs65 rabbitmq-4239234776-amzjt rabbitmq-4239234776-wq6s4
    

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15. $BUUMF Ոச
    
    

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16. Cattle or Pets
    • εέʔϧ͢ΔΞʔΩςΫνϟͷͨΊʹ͸ɺ֤ϊʔυΛՈசͷΑ
    ͏ʹѻ͏ඞཁ͕͋Δ
    • Ϋϥ΢υωΠςΟϒͳੈքͰ͸ׂͱ;ͭʔ
    • ͱ͸͍͑ɺશͯͷΞϓϦ͕ͦ͏࡞ΕΔΘ͚͡Όͳ͍
    

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17. PetSets is Կ
    • ݱߦͷk8s 1.3ͰΞϧϑΝ൛͕࣮૷͞Εͨػೳ
    • Ϋϥ΢υωΠςΟϒͰ͸ͳ͍;ͭʔͷΞϓϦέʔγϣϯΛ

    k8sͰಈ͔͠΍͘͢͠Α͏ͥ ɹͱ͍͏ػೳ
    

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18. PetSetͰ্͛ͨ৔߹
    jacopen@ssh2:~/kubernetes$ kubectl get pods
    NAME READY STATUS RESTARTS AGE
    rabbitmq-0 1/1 Running 0 18s
    rabbitmq-1 1/1 Running 0 12s
    rabbitmq-2 1/1 Running 0 7s
    

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19. root@rabbitmq-0:/# hostname
    rabbitmq-0
    root@rabbitmq-0:/# ip a
    1: lo: mtu 65536 qdisc noqueue state UNKNOWN group default
    qlen 1
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
    valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host
    valid_lft forever preferred_lft forever
    727: eth0@if728: mtu 1350 qdisc noqueue state UP
    group default
    link/ether 02:42:ac:20:52:11 brd ff:ff:ff:ff:ff:ff
    inet 172.32.82.17/24 scope global eth0
    valid_lft forever preferred_lft forever
    inet6 fe80::42:acff:fe20:5211/64 scope link tentative dadfailed
    valid_lft forever preferred_lft forever
    root@rabbitmq-0:/# ping rabbitmq-1.rabbitmq
    PING rabbitmq-1.rabbitmq.petset.svc.cluster.local (172.32.41.13) 56(84) bytes of
    data.
    64 bytes from 172.32.41.13: icmp_seq=1 ttl=62 time=0.575 ms
    64 bytes from 172.32.41.13: icmp_seq=2 ttl=62 time=0.752 ms
    

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20. 0 1 2
    0൪͔Βॱ൪ʹ্͛ͯ͘ΕΔ
    

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21. 0 1 2
    େ͖͍൪߸͔Βॱʹམͱͯ͘͠ΕΔ
    ŋŋŋ͸ͣ
    

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22. http://kubernetes.io/docs/user-guide/petset/
    

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23. ॴײ
    • ·ͩ·ͩαͳͷͰ͓͔͠ͳಈ͖ଟ͠
    • ࣮ઓ౤ೖ͸·ͩແཧɻ1.4΍1.5͋ͨΓʹظ଴
    • ͱ͸͍͑ɺStateless͚ͩͰͳ͘Stateful΋αϙʔτ͢ΔྲྀΕ͸

    ແࢹग़དྷͳ͍Ͷ
    

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