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[2019/1/30][cndjp#9] Database on Kubernetes
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[2019/1/30][cndjp#9] Database on Kubernetes
1.
Database on Kubernetes ~
ポスグレの Cloud Native 仕立て ~ 2019/1/30 @tzkb
2.
自己紹介 • 名 前
:Takahiro Kobayashi • 勤務先 :SIer • 出没場所 :Oracle、PostgreSQL、k8s関連に色々と • キャリア :DB、ストレージを中心にインフラ • 好きなもの:速いDB 、太い帯域、小さいレイテンシ
3.
PGConf.Asia 2018で話してきた • のコミュニティで、 「
は良いぞ!」と 呼びかけた結果、、、 • あんまり反応はなかった。 • そもそもDB技術者たちは 自分事として捉えていない?
4.
Advent Calender(全部俺)書いたら、 • ”kubernetes
postgersql”で GoogleのTOPに。 • QiitaさんのSEO力、半端ない。
5.
今日話すこと • Kubernetes ”から”
使うDBはどこに置くの? • ManagedなDBはやっぱりいいよね。 • それでもDatabase on k8sするなら、これ。 • 2019年にはこれが来る!
6.
k8sから使うDB、どこに置くの? DB エンジン Storage k8sに置くよ Managedだよ
7.
PVも使えない、こんな世の中じゃポ(略)
8.
ManagedなDB、やっぱりいいよね • Auroraはすごい! – 3つのAZ、6本のディスクに冗長化 –
再起動でもキャッシュ消えない! – No checkpoint (!?) – Vacuumも賢くなってる – 詳しくはDive Deep読んでみよう • でも、設計思想はこんな感じ。 • あれ?k8sで出来そうじゃない?
9.
k8sのメリットを活かしたDatabase Replication • Master-Standbyでノードを冗長化。 •
read query offroading に適する。 Partitioning Sharding • テーブルを行単位で物理的に分割。 • マルチコア、スケールアップとの相性良し。 • テーブルを複数ノードに分散配置。 • スケールアウトと相性が良い。
10.
Replication on Kubernetes •
Postgresqlのストリーミング・ レプリケーションをk8sに構築。 • Master-Standby構成で、障害時は Standby1台が昇格。 • k8sのオートヒーリングで復旧も。 (できるはず) • read queryにはスケールアウト可。
11.
Sharding on Kubernetes •
mysqlベースのShardingをk8sで。 • オートヒーリング、スケールアウトが 可能な強力なDBプラットフォーム。 • Sharding+Replicationでデータも 冗長化。 • がDBaaSで提供。 • オンプレAuroraに最も近いか? VTtablet VTtablet VTtablet VTgate SQL
12.
は、k8sでSharding できないの?
13.
2019年にきっと来るはず! • Postgresqlで昔からある、 Sharding拡張機能=Citus • k8s対応はリポジトリがあるもの の、あまり進んでいない様子。 •
と思ったら、、、 • Microsoftに買収された! • どちらもありそう。 – Azure版 Aurora – Postgresql版 Vitess
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