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kube-state-metrics Sharding
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d-kuro
November 02, 2022
Programming
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350
kube-state-metrics Sharding
https://techfeed.io/events/techfeed-experts-night-7
で発表した資料です。
d-kuro
November 02, 2022
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Transcript
kube-state-metrics Sharding TechFeed Experts Night#7 ʙ ίϯςφٕज़ΛޠΔ
I work for @ponde_m @d-kuro
kube-state-metrics ͱ • Kubernetes ͷ api-server Λࢹ֤ͯ͠छΦϒδΣΫτͷঢ়ଶͷ ϝτϦΫεΛఏڙͯ͘͠ΕΔͭ
• γϟʔυͱݺΕΔখ͞ͳνϟϯΫʹσʔλΛׂ • ෳͷϚγϯͳͲʹ͚ͯอଘ͢Δ͜ͱͰ େنͳσʔληοτΛཧ • Ԡͷ্ͳͲʹ༻͍ΒΕΔ Sharding
• Α͋͘Δσʔλϕʔεͷ Sharding ͷҰྫ Sharding https://aws.amazon.com/jp/blogs/news/sharding-with-amazon-relational-database-service/
Kubernetes controller ͷ Sharding • controller ௨ৗɺϦʔμʔબग़ͰϦʔμʔͱͳͬͨ Pod ͷΈ͕
reconcile Λߦ͏ͱ͍͏Ξϓϩʔνʹͳ͍ͬͯΔ https://speakerdeck.com/daikurosawa/leader-election-in-kubernetes-number-k8sjp
• ͪΐͬͱલʹʹͳͬͨͭ • Sharder ͕ϥϕϧΛׂΓৼͬͯ ͲͷγϟʔυͰॲཧ͢Δ͔Λ ܾఆ͢Δ •
ͬͪ͜ͷࠓ͠·ͤΜ Kubernetes controller ͷ Sharding https://github.com/timebertt/thesis-controller-sharding/blob/master/assets/design-overview.pdf
kube-state-metrics ͷ Sharding • ࠓճͷςʔϚ controller Ͱͳ͍͚Ͳ kube-state-metrics ͕
controller Ͱ༻Ͱ͖ΔΞϓϩʔνͰ Sharding Λߦ͏ػೳ͕࣮͞Ε͍ͯΔͨΊɺͦͷհΛ͠·͢
kube-state-metrics ͷ Sharding Pod1 Pod2 1. CM1 Metrics 2. CM3
Metrics Export Metrics api-server 1. CM1 2. CM2 3. CM3 4. CM4 Con fi gMap List 1. CM2 Metrics 2. CM4 Metrics Export Metrics
kube-state-metrics ͷ Sharding https://github.com/kubernetes/kube-state-metrics/pull/613
kube-state-metrics ͷ Sharding https://github.com/kubernetes/kube-state-metrics/pull/613 γϟʔυʹׂ͢Δ͜ͱͰ ॲཧ͢ΔΦϒδΣΫτ͕ݮΓ ϨΠςϯγ͕গͳ͘ͳΔ
࣮ • kube-state-metrics Λ StatefulSet Ͱಈ͔͢ • ϨϓϦΧͱ Pod ͷඌͷ൪߸͔Β
Կ൪ͷγϟʔυͳͷ͔ݕग़͢Δ • Kubernetes ͷΦϒδΣΫτͷ UID Λ༻͍ͯ Consistent Hash ͠ɺॲཧ͢ΔγϟʔυΛܾఆ͢Δ
࣮ • kube-state-metrics Λ StatefulSet Ͱಈ͔͢ • ϨϓϦΧͱ Pod ͷඌͷ൪߸͔Β
Կ൪ͷγϟʔυͳͷ͔ݕग़͢Δ • Kubernetes ͷΦϒδΣΫτͷ UID Λ༻͍ͯ Consistent Hash ͠ɺॲཧ͢ΔγϟʔυΛܾఆ͢Δ
Pod ໊ͳͲΛҾʹऔΔ
Pod ͷ ownerReferences ͔Β StatefulSet Λऔಘ
StatefulSet ͷϨϓϦΧΛ τʔλϧͷγϟʔυ Pod ໊ͷඌ͔Βγϟʔυͷ ൪߸Λऔಘ
StatefulSet Λ informer Ͱ watch EventHandler Ͱγϟʔυͷઃఆͱ metrics ͷϦηοτΛߦ͏
͜͏͢Δ͜ͱͰ HPA ͳͲͰ StatefulSet ͕εέʔϧͨ͠ࡍʹ γϟʔυͷ࠶ׂͯΛ ࣗಈͰߦ͏͜ͱ͕Ͱ͖Δ
࣮ • kube-state-metrics Λ StatefulSet Ͱಈ͔͢ • ϨϓϦΧͱ Pod ͷඌͷ൪߸͔Β
Կ൪ͷγϟʔυͳͷ͔ݕग़͢Δ • Kubernetes ͷΦϒδΣΫτͷ UID Λ༻͍ͯ Consistent Hash ͠ɺॲཧ͢ΔγϟʔυΛܾఆ͢Δ
client-go ͷΞʔΩςΫνϟ
kube-state-metrics ͷΞʔΩςΫνϟ kube-state-metrics Ͱ Re fl ector Λ༻ ਤͷΑ͏ʹ Delta
FIFO Queue ʹ ΦϒδΣΫτΛ֨ೲ͢ΔͷͰͳ͘ ϝτϦΫεΛ֨ೲ͢Δ MetricStore Λ࣮͍ͯ͠Δ
List & Watch ͷ࣮ͷதͰ ͲͷγϟʔυͰॲཧ͢Δ͔ͷ ఆΛߦ͍ͬͯΔ
List & Watch ͷ࣮ͷதͰ ͲͷγϟʔυͰॲཧ͢Δ͔ͷ ఆΛߦ͍ͬͯΔ
Consistent Hash Ͱॲཧ͢ΔγϟʔυΛܾఆ͠ɺ ࣗγϟʔυͱҰக͢Δ߹ͷΈॲཧΛߦ͏
͜ͷ ListerWatcher Λ༻͍ͯ informer ͳΓΛੜ͢Ε controller ͕࡞ΕΔ
σϝϦοτ • StatefulSet ͷϩʔϧΞτʹىҼ͢ΔσϝϦοτ • ϩʔϧΞτ͕ 1 ͣͭߦΘΕΔͨΊ͍ • Pod
ͷআ͕ઌʹ࣮ࢪ͞ΕΔ • ͜ͷλΠϛϯάͰ Prometheus ͷεΫϨΠϓ͕ൃੜ͢Δͱ ϝτϦΫεͷܽଛʹܨ͕ΔՄೳੑ͕͋Δ • List & Watch ͷ෦γϟʔσΟϯάͰ͖ͳ͍ͨΊɺ ରͱͳΔશΦϒδΣΫτΛਫ਼ࠪ͢ΔͷϦιʔε͕ඞཁͱͳΔ
·ͱΊ • controller ͷγϟʔσΟϯάʹ͑ͦ͏ͳ kube-state-metrics Ͱ༻͍ΒΕ͍ͯΔγϟʔσΟϯάख๏Λհ • StatefulSet ͷಛੑΛ্ख͍ͬͯ͘Δ
• ΦϒδΣΫτͷ UID Ͱ Consistent Hash
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