Operator reading and writing Operator SDK & 2020/1/17 # node-3 @loftkun

About Me @loftkun ( _F G7 ) èáòP2 j ÑòàÔãêÙÜáËòæNŒ 20191b)D : 10 ¹¡¸µ¯§d #¹¡¸µ¯§ node-1 #¹¡¸µ¯§ node-2 #¹¡¸µ¯§ virtual-kubelet-1 #¹¡¸µ¯§ node-3

Motivation • #–Prometheus Operator¶^HWÇ"½•ÇLT¥»¥ª • #·Operator¶-w“´gf¥¯¥¥»§

Environment 28 0 36 . 28 3 4 6 836 : / (80 : 1.2./ : 62 8 7 : 67.32 :

Agenda Operator is * Reading Writing

Operator is *

hƒ https://kubernetes.io/docs/concepts/overview/components/ ! #

Operator is õ built-in controller ¶ 43 73 6( 3286300 6 4/, (3286300 6 / 62 8 7 / 62 8 7 40.( 8 6 40.( 7 8 6 40.( 7 8 ,3 132 8 ) 132 ) 132 (3286300 6 ,3 403 1 28 ) 403 1 28 ) 403 1 28 (3286300 6 ,3 43) 837( 0 6 -36. 328 0 ,3

hƒ 1. e{ ( watch ) resource¶ÉäðÜ(Add/Update/Delete)Çwatch 2. ‚E ( reconcile ) 1. ÉäðÜU¶ reconcile.Requests ŸÜëÎò 2. ÌâÓÊÏܶSpec(™Äº Y9)±ÒÔÚæ¶Y9Ÿ u§Äži€ 3. u¥³š(–5x´6¦ª‚EÇv› 5x³ÌâÓÊÏÜÇAdd/Update/Delete§Ä— https://kubernetes.io/docs/concepts/overview/components/ .}c~,´&®šªt04SsŸ-w¤Å¯šÄ e{(watch)±‚E(reconcile)Çv›¶ŸController

Operator is *

Operator is õ Operator = Custom Resource + Custom Controller https://kubernetes.io/docs/concepts/extend-kubernetes/operator/ • CR ( Custom Resource ) – Deployment¶Á›³ built-in³resource°·³¡–Zt´,r¥ª resource – CRDó Custom Resource Definition ô °,r° Ä • Custom Controller – CRÇe{(watch)–‚E(reconcile)¥“ÇyĪ¾´–Zt´-w¥ªcontroller – &Nc³Ã·Deployment controller¶Á›³ built-in³controller± R • watch À reconcile Çv› ¶=Q´ÁĊ^(Operation)Çt§Ä¶ŸOperator

Operator is õ built-in controller ¶ ( @ ) 43 73 6( 3286300 6 4/, (3286300 6 / 62 8 7 / 62 8 7 40.( 8 6 40.( 7 8 6 40.( 7 8 ,3 132 8 ) 132 ) 132 (3286300 6 ,3 403 1 28 ) 403 1 28 ) 403 1 28 (3286300 6 ,3 43) 837( 0 6 -36. 328 0 ,3 43 7831 73 6( 3286300 6 34 6 836 6 1 36/ 34 6 836 7)/ 7 140 7 1( (- ) 4 6 836 1( (- ) (3286300 6 1 1( (- ) 1 1( (- ) (3286 300 6 ,3 (36 37 4631 8- 7 34 6 836 631 8- 7 0 681 2 , 6 8( 4631 8- 7 34 6 836 ,3 36 (0 1 750 34 6 836 0 78 6 (/ 4 7836 8( 4/, (3286300 67 (0 78 6 (328630 ,3 (/ 4 34 6 836 (3286300 6 ,3 6 7836 34 6 836 (3286300 6 ,3 Operator ¶

-w=T • êÉâêëǛ – client-go , code-generator ³² • built –in ³ÐðÜîòêò·£Å¶êÉâêë°-w¤Å¯šÄ • ´·coreos/prometheus-operator³²¿£¶=T°-w¤Å¯šÄÁ›« • áíòæïòÏǛ – kubernetes-sigs/kubebuilder – operator-framework/operator-sdk • OLM ( Operator LifeCycle Manager ) • ©¶ – KUDO – Metacontroller

Reading

½k< Operator = Custom Resource + Custom Controller ³¶°– • CRD ( Custom Resource Definition ô Ç ½ – spec • reconcile loop°X¤ÅÄ8' – spec±[$¶ÌâÓÊÏܶY9ÇV†¥¯reconcile§Ä – status • reconcile loop°KG¤ÅÄ8' – [$¶ÌâÓÊÏܶY9 ( kubeclt describe °i€° Ä ) • Reconcile ¶\ǁ½ – Spec±[$¶ÒÔÚæ¶Y9¶V† – 5x´6¦¯ÌâÓÊÏܶA(Add/Update/Delete)

operator-framework/operator-sdk-samples • Operator SDK °:¤ÅªOperator¶Ñðãì (Memcached Go Operator) CRD Reconcile https://github.com/operator-framework/operator-sdk-samples

Writing

Install Operator SDK https://github.com/operator-framework/operator-sdk/blob/master/doc/user/install-operator-sdk.md

operator-framework/getting-started 1. $'" 2. CRD ) 3. ) 4. & %( https://github.com/operator-framework/getting-started

1. GzãîÓÊÏÜ: GzãîÓÊÏÜÇ]:§Ä https://github.com/operator-framework/getting-started Operator¶ÖòÔÐòݶscaffold(…()Ÿ° Ä

1. GzãîÓÊÏÜ: *C https://github.com/operator-framework/getting-started

1. GzãîÓÊÏÜ: GOROOTÇ~,§Ä±›»¡š¬ª https://github.com/operator-framework/getting-started

2. CRDLJ CRD¶scaffoldLJ§Ä https://github.com/operator-framework/getting-started

2. CRDLJ CRD¶scaffoldÇq’§Ä https://github.com/operator-framework/getting-started specÇq’ ñ;˜·kubectl create°CR]:J´Ç?, ° Ä ñOperatorŸreconcile ¶‘´X§Ä NØéòÜëÈì°·int%¶size(íãëÍD)Ç,r¥¯š ė statusÇq’ ñOperatorŸ[$¶Y9Ç~,§Ä ñ;˜·kubectl describe°i€° Ä NØéòÜëÈì°·string¶±¥¯pod!¶ëÔÜÇ ,r¥¯šÄ—

2. CRDLJ *_types.goÇq’¥ª(·–ëÖòÔ¶ÐòÝÇ]:§Ä https://github.com/operator-framework/getting-started

2. CRDLJ OpenAPI validations Ç]:§Ä https://github.com/operator-framework/getting-started

2. CRDLJ ]:¤ÅªCRD¶yaml https://github.com/operator-framework/getting-started Memcached±š›kind·built-in³ resouce´·³š £¶CRDÇÏêÔ×´‹^§Ä±– kind:MemcachedŸœÄÁ›´³Ä

2. CRDLJ ]:¤ÅªCRD¶yaml ( ­® >l ) https://github.com/operator-framework/getting-started spec¶validation status¶validation

3. ControllerLJ Controller¶scaffoldLJ§Ä https://github.com/operator-framework/getting-started

3. ControllerLJ ‡¤ÅªÖòÔ ( pkg/controller/memcached/mem cached_controller.go ) https://github.com/operator-framework/getting-started CRÇwatch PodÇwatch £¶Á›´scaffold±¥¯·PodÇwatch §ÄÐòݟ]:¤Åė DeploymentÇwatch§ÄÁ›B‰§Ä—

3. ControllerLJ https://github.com/operator-framework/getting-started ‡¤ÅªÖòÔ ( pkg/controller/memcached/mem cached_controller.go ) CRÇwatch PodÇwatch £¶Á›´scaffold±¥¯·PodÇwatch §ÄÐòݟ]:¤Åė DeploymentÇwatch§ÄÁ›B‰§Ä—

3. ControllerLJ ‡¤ÅªÖòÔ ( pkg/controller/memcached/mem cached_controller.go ) https://github.com/operator-framework/getting-started ( p¡ ) Reconcile\¶scaffold CR¶ÌâÓÊÏÜÇ3

3. ControllerLJ ‡¤ÅªÖòÔ ( pkg/controller/memcached/mem cached_controller.go ) https://github.com/operator-framework/getting-started Reconcile\¶scaffold PodÇ]:§Ä £¶Á›´scaffold·–PodÇ]: §ÄÐòÝ°™Ä—(image· busybox) DeploymentÇ]:§ÄÁ›ÐòÝ ´/¥MœÄ

3. ControllerLJ https://github.com/operator-framework/getting-started 1 DeploymentÇ: m Ÿ ÍÔ×æëÖòÔ¶X8'°– ¦!– ¦ßòæÔåòÔ´ :¥¯šÄ Image·memcached-alpine

3. ControllerLJ https://github.com/operator-framework/getting-started 1 DeploymentÇ: r.Client·sigs.k8s.io/controller-runtime

3. ControllerLJ https://github.com/operator-framework/getting-started 2 DeploymentÇKG Ÿu§Äži€¥–u¥³š(·KG§Ä – CR¶spec°,r¥ªsize – Deployment¶size(replicaD)

3. ControllerLJ https://github.com/operator-framework/getting-started 3 CR¶status(describe°yÅÄÀ­)ÇKG(pod!ëÔÜÇL¡)

3. ControllerLJ https://github.com/operator-framework/getting-started 3 CR¶status(describe°yÅÄÀ­)ÇKG(pod!ëÔÜÇL¡) Status¶Nodes´ node!¶ëÔÜÇ L¢¯šÄ

4 build & i€ CRDÇAPI Server´bŽ§Ä https://github.com/operator-framework/getting-started ( ` )

4 build & i€ ÐðÚÞÉçòÓ¶build & push https://github.com/operator-framework/getting-started

4 build & i€ ÛãîÉ https://github.com/operator-framework/getting-started

4 build & i€ ÛãîÉ https://github.com/operator-framework/getting-started

4 build & i€ ÍÔ×æëÖòÔÇ]:§Ä https://github.com/operator-framework/getting-started

4 build & i€ iž´podŸ3­:¤Åª https://github.com/operator-framework/getting-started Operator¶custom controllerŸwatch¥–reconcile¥ªoO Deployment¶repliaDÇ3´KG¥¯šÄ

4 build & i€ ÍÔ×æëÖòÔ¶sizeÇ4´¥¯¼Ä https://github.com/operator-framework/getting-started

4 build & i€ iž´podŸ4­´³¬ª https://github.com/operator-framework/getting-started Operator¶custom controllerŸwatch¥–reconcile¥ªoO Deployment¶repliaDÇ3žÂ4´KG¥¯šÄ

Tips OperatorÇîòÍ찄° ėa&ÚÔÜÇmI¡#¨Ä https://github.com/operator-framework/getting-started £¶(–Operator·ÐðÚÞ°·³¡–go¶ãîÕÔ±¥¯îòÍ찄§Ä K8s±¶ˆ´·default° $HOME/.kube/config ŸÆÅÄ

»±¾ • Operator = Custom Resource + Custom Controller – ¶=Q´ÁĊ^(Operation)Çt • Reading – CRD ( Custom Resource Definition ) ǁ½ –reconcile\ǁ½ • Writing – Operator SDK ´ÁÄ-w=”Çn¥»¥ª

»±¾ • Operator = Custom Resource + Custom Controller – ¶=Q´ÁĊ^(Operation)Çt • Reading – CRD ( Custom Resource Definition ) ǁ½ –reconcile\ǁ½ • Writing – Operator SDK ´ÁÄ-w=”Çn¥»¥ª OperatorÇ+´\|¥»¥ª