Kubernetes Scheduler Startup and Configuration Sequence

K8S Scheduler Application Lifecycle.png

K8S Scheduler Application Lifecycle.svg

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stroke markers" d=" M 8.167601650000002 72.20159858600003 L 85.14341993502345 72.20159858600003 L 85.14341993502345 116.14329546300002 L 8.167601650000002 116.14329546300002 L 8.167601650000002 72.20159858600003 Z" stroke-miterlimit="10" stroke-width="2.613632528" stroke-dasharray=""/></g><g><text fill="black" stroke="none" font-family="sans-serif" font-size="11pt" font-style="normal" font-weight="normal" text-decoration="normal" x="25.891297230500008" y="99.80809216300001" text-anchor="start" dominant-baseline="alphabetic">main()</text></g><path fill="none" stroke="none"/><g><path fill="white" stroke="black" paint-order="fill stroke markers" d=" M 1685.3879738873893 51.78259446100001 L 2000.2773816499518 51.78259446100001 L 2000.2773816499518 116.14329546300002 L 1685.3879738873893 116.14329546300002 L 1685.3879738873893 51.78259446100001 Z" stroke-miterlimit="10" stroke-width="2.613632528" stroke-dasharray=""/></g><g><text fill="black" stroke="none" font-family="sans-serif" font-size="11pt" font-style="normal" font-weight="normal" text-decoration="normal" x="1703.1116694678892" y="79.389088038" text-anchor="start" dominant-baseline="alphabetic">k8s.io/kubernetes/cmd/kube-scheduler/app</text><text fill="black" stroke="none" font-family="sans-serif" font-size="11pt" font-style="normal" font-weight="normal" text-decoration="normal" x="1725.561056064569" y="99.808092163" text-anchor="start" dominant-baseline="alphabetic"></text><text fill="black" stroke="none" font-family="sans-serif" font-size="13.2pt" font-style="normal" font-weight="normal" text-decoration="normal" x="1725.561056064569" y="99.808092163" text-anchor="start" dominant-baseline="alphabetic"></text><text fill="black" stroke="none" font-family="sans-serif" font-size="13.2pt" font-style="normal" font-weight="bold" text-decoration="normal" x="1725.561056064569" y="99.808092163" text-anchor="start" dominant-baseline="alphabetic">func Run(CompletedConfig)</text><text fill="black" stroke="none" 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font-weight="normal" text-decoration="normal" x="296.95820986298565" y="177.80868792049998" text-anchor="start" dominant-baseline="alphabetic">command</text></g><g><g><rect fill="white" stroke="none" x="78.23690383917837" y="150.937278492" width="177.58381904664063" height="21.23576429"/></g><text fill="black" stroke="none" font-family="sans-serif" font-size="11pt" font-style="normal" font-weight="normal" text-decoration="normal" x="80.68718433417837" y="165.63896146199997" text-anchor="start" dominant-baseline="alphabetic">NewSchedulerCommand()</text></g><g><path fill="none" stroke="black" paint-order="fill stroke markers" d=" M 54.82311244251173 172.17304278199998 L 276.5119803991523 172.17304278199998" stroke-miterlimit="10" stroke-width="1.3612669416666667" stroke-dasharray=""/><g transform="translate(279.23451428248563,172.17304278199998) translate(-279.23451428248563,-172.17304278199998)"><path fill="black" stroke="none" paint-order="stroke fill markers" d=" M 265.62184486581896 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text-decoration="normal" x="553.7982548196901" y="286.6011418984999" text-anchor="start" dominant-baseline="alphabetic">func</text></g><g><g><rect fill="white" stroke="none" x="356.6308509127773" y="251.56213081999996" width="127.91144050660156" height="21.23576429"/></g><text fill="black" stroke="none" font-family="sans-serif" font-size="11pt" font-style="normal" font-weight="normal" text-decoration="normal" x="359.0811314077773" y="266.26381379" text-anchor="start" dominant-baseline="alphabetic">value of `Run` field</text></g><g><path fill="none" stroke="black" paint-order="fill stroke markers" d=" M 329.13325869111065 272.79789510999996 L 509.31734975771224 272.79789510999996" stroke-miterlimit="10" stroke-width="1.3612669416666667" stroke-dasharray=""/><g transform="translate(512.0398836410455,272.79789510999996) translate(-512.0398836410455,-272.79789510999996)"><path fill="black" stroke="none" paint-order="stroke fill markers" d=" M 498.4272142243789 265.9915604016666 L 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y="1144.4443431979994" text-anchor="start" dominant-baseline="alphabetic"></text><text fill="black" stroke="none" font-family="sans-serif" font-size="11pt" font-style="normal" font-weight="normal" text-decoration="normal" x="3002.2732145434334" y="1144.4443431979994" text-anchor="start" dominant-baseline="alphabetic"></text></g><g><g><rect fill="white" stroke="none" x="2262.5063356147475" y="1107.3634317069996" width="162.9060999304297" height="21.23576429"/></g><text fill="black" stroke="none" font-family="sans-serif" font-size="11pt" font-style="normal" font-weight="normal" text-decoration="normal" x="2264.9566161097473" y="1122.0651146769997" text-anchor="start" dominant-baseline="alphabetic">NewFromConfig(Config)</text></g><g><path fill="none" stroke="black" paint-order="fill stroke markers" d=" M 1851.0002794186705 1128.5991959969995 L 2834.1959578579203 1128.5991959969995" stroke-miterlimit="10" stroke-width="1.3612669416666667" stroke-dasharray=""/><g 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font-family="sans-serif" font-size="13.2pt" font-style="normal" font-weight="bold" text-decoration="normal" x="2106.1720513386563" y="1322.6614112009995" text-anchor="start" dominant-baseline="alphabetic">LeaderElector</text><text fill="black" stroke="none" font-family="sans-serif" font-size="13.2pt" font-style="normal" font-weight="normal" text-decoration="normal" x="2223.5123986286953" y="1322.6614112009995" text-anchor="start" dominant-baseline="alphabetic"></text><text fill="black" stroke="none" font-family="sans-serif" font-size="11pt" font-style="normal" font-weight="normal" text-decoration="normal" x="2223.5123986286953" y="1322.6614112009995" text-anchor="start" dominant-baseline="alphabetic"></text></g><g><g><rect fill="white" stroke="none" x="1874.4140708153373" y="1285.5804997099997" width="135.23240913453125" height="21.23576429"/></g><text fill="black" stroke="none" font-family="sans-serif" font-size="11pt" font-style="normal" font-weight="normal" text-decoration="normal" x="1876.8643513103373" y="1300.2821826799998" text-anchor="start" dominant-baseline="alphabetic">NewLeaderElector()</text></g><g><path fill="none" stroke="black" paint-order="fill stroke markers" d=" M 1851.0002794186705 1306.8162639999996 L 2030.3377374632018 1306.8162639999996" stroke-miterlimit="10" stroke-width="1.3612669416666667" stroke-dasharray=""/><g transform="translate(2033.0602713465353,1306.8162639999996) translate(-2033.0602713465353,-1306.8162639999996)"><path fill="black" stroke="none" paint-order="stroke fill markers" d=" M 2019.4476019298686 1300.0099292916664 L 2033.0602713465353 1306.8162639999996 L 2019.4476019298686 1313.6225987083328 Z"/></g></g><g><g><rect fill="white" stroke="none" x="1983.063280195138" y="1364.8879117314998" width="41.548342362070315" height="21.23576429"/></g><text fill="black" stroke="none" font-family="sans-serif" font-size="11pt" font-style="normal" font-weight="normal" text-decoration="normal" x="1985.513560690138" y="1379.5895947015" text-anchor="start" dominant-baseline="alphabetic">Run()</text></g><g><path fill="none" stroke="black" paint-order="fill stroke markers" d=" M 1851.0002794186705 1386.1236760214997 L 2153.9520894503426 1386.1236760214997" stroke-miterlimit="10" stroke-width="1.3612669416666667" stroke-dasharray=""/><g transform="translate(2156.6746233336758,1386.1236760214997) translate(-2156.6746233336758,-1386.1236760214997)"><path fill="black" stroke="none" paint-order="stroke fill markers" d=" M 2143.0619539170093 1379.3173413131665 L 2156.6746233336758 1386.1236760214997 L 2143.0619539170093 1392.930010729833 Z"/></g></g><g><g><rect fill="white" stroke="none" x="2192.3398172053426" y="1410.6264809714996" width="124.66960395875" height="21.23576429"/></g><text fill="black" stroke="none" font-family="sans-serif" font-size="11pt" font-style="normal" font-weight="normal" text-decoration="normal" x="2194.7900977003424" y="1425.3281639414997" text-anchor="start" dominant-baseline="alphabetic">acquire leadership</text></g><g><path fill="none" stroke="black" paint-order="fill stroke markers" d=" M 2173.009826633676 1431.8622452614995 L 2238.350639833676 1431.8622452614995 L 2238.350639833676 1448.1974485614996 L 2175.732360517009 1448.1974485614996" stroke-miterlimit="10" stroke-width="1.3612669416666667" stroke-dasharray=""/><g transform="translate(2173.009826633676,1448.1974485614996) translate(-2173.009826633676,-1448.1974485614996)"><path fill="black" stroke="none" paint-order="stroke fill markers" d=" M 2186.6224960503423 1441.3911138531664 L 2173.009826633676 1448.1974485614996 L 2186.6224960503423 1455.0037832698329 Z"/></g></g><g><g><rect fill="white" stroke="none" x="2541.5172750839847" y="1472.7002535114998" width="41.548342362070315" height="21.23576429"/></g><text fill="black" stroke="none" font-family="sans-serif" font-size="11pt" font-style="normal" font-weight="normal" text-decoration="normal" x="2543.9675555789845" 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font-style="normal" font-weight="normal" text-decoration="normal" x="2919.652174199195" y="1565.8109123214997" text-anchor="start" dominant-baseline="alphabetic"> run loop!</text><text fill="black" stroke="none" font-family="sans-serif" font-size="11pt" font-style="normal" font-weight="normal" text-decoration="normal" x="2993.008146489234" y="1565.8109123214997" text-anchor="start" dominant-baseline="alphabetic"></text></g><g><g><rect fill="white" stroke="none" x="2484.0802328476566" y="1605.0154002415" width="156.42242683472656" height="21.23576429"/></g><text fill="black" stroke="none" font-family="sans-serif" font-size="11pt" font-style="normal" font-weight="normal" text-decoration="normal" x="2486.5305133426564" y="1619.7170832115" text-anchor="start" dominant-baseline="alphabetic">crash or lost leadership</text></g><g><path fill="none" stroke="black" paint-order="fill stroke markers" d=" M 2951.573065896363 1626.2511645314999 L 2175.732360517009 1626.2511645314999" 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dominant-baseline="alphabetic">made with https:</text><text fill="black" stroke="none" font-family="sans-serif" font-size="11pt" font-style="normal" font-weight="normal" text-decoration="normal" x="1521.366081237793" y="1856.5775310615002" text-anchor="start" dominant-baseline="alphabetic">//</text><text fill="black" stroke="none" font-family="sans-serif" font-size="11pt" font-style="normal" font-weight="normal" text-decoration="normal" x="1529.5100326538086" y="1856.5775310615002" text-anchor="start" dominant-baseline="alphabetic">sequencediagram.org/</text></g></g></g></svg>

K8S Scheduler Configuration Handling.png

K8S Scheduler Configuration Handling.svg

scheduler-config-lifecycle.txt

title K8S Scheduler Configuration Handling
# Paste into https://sequencediagram.org/

participant "command line\nflags" as flags
participant "k8s.io/kubernetes/cmd/kube-scheduler/options\n++**Options**++" as Options
participant "k8s.io/kubernetes/cmd/kube-scheduler/config\n++**Config**++" as Config
participant "k8s.io/kubernetes/pkg/apis/componentconfig/v1alpha1\n++**KubeSchedulerConfiguration**++" as componentConfig
participant "k8s.io/kubernetes/cmd/kube-scheduler/config\n++**CompletedConfig**++" as CompletedConfig
participant "k8s.io/kubernetes/pkg/scheduler/api\n++**Policy**++" as Policy
participant "k8s.io/kubernetes/pkg/scheduler\n++**Configurator**++" as Configurator
participant "k8s.io/kubernetes/pkg/scheduler\n++**Config**++" as schedConfig
participant "k8s.io/kubernetes/pkg/scheduler\n++**Scheduler**++" as Scheduler


flags --> Options: parsed into fields of
destroysilent flags

Options -> *Config:
Options --> Config: ApplyTo() fills out some fields
Options -> *componentConfig: loadConfigFromFile()
componentConfig --> Options: member of
destroysilent componentConfig

Options --> Config: Config() fills out other fields
destroysilent Options

Config -> *CompletedConfig: Complete() applies some defaults
destroysilent Config

CompletedConfig -> *Configurator: NewConfigFactory()

abox left of CompletedConfig: Either a provider name or a Policy object is used

CompletedConfig -> *Policy: reads from ComponentConfig or separate file
destroysilent CompletedConfig

Configurator ->(3) *schedConfig: CreateFromProvider(string)\n               or\nCreateFromConfig(Policy)
destroysilent Configurator

space -7.1
Policy -> *schedConfig:
destroysilent Policy

schedConfig -> *Scheduler: NewFromConfig()
destroysilent schedConfig

note over Scheduler: now we can call Run()

==made with https://sequencediagram.org/==

scheduler-startup-sequence.txt

title K8S Scheduler Application Lifecycle
# Paste into https://sequencediagram.org/

participant "main()" as main
participant "command" as command
participant "anonymous\nfunc" as anonFunc
participant "k8s.io/kubernetes/cmd/kube-scheduler/options\n++**Options**++" as Options
participant "k8s.io/kubernetes/cmd/kube-scheduler/config\n++**Config**++" as Config
participant "k8s.io/kubernetes/cmd/kube-scheduler/config\n++**CompletedConfig**++" as CompletedConfig
participant "k8s.io/kubernetes/cmd/kube-scheduler/app\n++**func Run(CompletedConfig)**++" as appPkg
participant "k8s.io/client-go/tools/leaderelection\n++**LeaderElector**++" as LeaderElector
participant "k8s.io/kubernetes/pkg/scheduler\n++**Configurator**++" as Configurator
participant "k8s.io/kubernetes/pkg/scheduler\n++**Config**++" as schedulerConfig
participant "k8s.io/kubernetes/pkg/scheduler\n++**Scheduler**++" as scheduler


activate main
main->*command: NewSchedulerCommand()

note left of command:This is a\nCobra command
space -5
command->*anonFunc:value of `Run` field
#space -6
#rbox over main: flags get parsed\ninto `Options`

main->*Options: flags get parsed

main->command: Execute()
activate command
command->anonFunc:
activate anonFunc



anonFunc->>Options: Validate()

linear on
anonFunc->Options: Config()
space -5
Options->*Config:
destroysilent Options
linear off

linear on
anonFunc->Config:Complete()
space -5
Config->*CompletedConfig:
destroysilent Config
linear off

CompletedConfig-->(3)appPkg:
space -3
destroysilent CompletedConfig
activate appPkg


space -2
anonFunc->appPkg:
#activate appPkg

appPkg->*Configurator: NewConfigFactory(CompletedConfig)

abox over Configurator:++Informer event handlers\nare added here++

linear on
appPkg->Configurator: NewSchedulerConfig()
destroysilent Configurator
space -5
Configurator->*schedulerConfig:
schedulerConfig-->(4)*scheduler:
linear off




space -7.1
destroysilent schedulerConfig

appPkg->*scheduler:NewFromConfig(Config)

abox over appPkg:++Informers and broadcasters\nare started here++




appPkg->*LeaderElector:NewLeaderElector()
appPkg->LeaderElector: Run()
activate LeaderElector
LeaderElector->LeaderElector: acquire leadership
LeaderElector->scheduler: Run()
activate scheduler

rbox over scheduler:++This is the\n run loop!++

# Unroll the stack here
scheduler->LeaderElector: crash or lost leadership
deactivate scheduler
LeaderElector->appPkg:
deactivate LeaderElector
appPkg->anonFunc:
deactivate appPkg
anonFunc->command:
deactivate anonFunc
command->main:
deactivate command
deactivate main


==made with https://sequencediagram.org/==