Der Bericht widmet sich praktischen Fragen der Betreiberentwicklung in Kubernetes, der Gestaltung seiner Architektur und den grundlegenden Funktionsprinzipien.
Im ersten Teil des Berichts werden wir Folgendes berücksichtigen:
- Was ist ein Betreiber in Kubernetes und warum wird er benötigt?
- wie der Bediener die Verwaltung komplexer Systeme vereinfacht;
- was der Bediener kann und was der Bediener nicht kann.
, . . :
- Kubernetes;
- , Kubernetes.
Kubernetes.
, :
- Persistent Storage ;
- Local Storage.
clickhouse-operator Amazon Google Cloud Service. ClickHouse.
:
. , . ClickHouse-operator ClickHouse.
ClickHouse?
- ClickHouse.
- ClickHouse. ClickHouse.
- ClickHouse.
. ClickHouse-operator Kubernetes.
:
- – ClickHouse Kubernetes.
- – , . . Kubernetes.
.
, ?
- , .
- , , , , Kubernetes .
, , , Kubernetes .
ClickHouse? - . open source.
. , , , , . , ClickHouse , . – ClickHouse . , ClickHouse Kubernetes.
? ? , .
- , Kubernetes. .
- : « ?». , .
- , , . . .
? , , . , , Kubernetes, ClickHouse. .
, , Kubernetes , ClickHouse . , ClickHouse- , - .
ClickHouse , DevOps:
- - ClickHouse, , , , .
- , ClickHouse . , .
- .
- , .
- .
- .
, .
Kubernetes , .
Kubernetes , :
- .
- .
- .
, , , .
, , Kubernetes.
- , , . ClickHouse Kubernetes.
, . ClickHouse-operator Kubernetes Altinity.
– , , . . .
. .
– DevOps , (DevOps) , . . (DevOps) , .
– , DevOps.
? :
- , ClickHouse, , ClickHouse , ClickHouse , , . , .
- , , . .
, , , .
, , ? Helm. ClickHouse, helm charts, ClickHouse. , , Helm?
, Helm – , . . , , , , . . , ( , ) – . . , .
, .
? , ClickHouse .
. YAML , kubectl Kubernetes. , . . ClickHouse Kubernetes.
, , . , . , .
. – open source, GitHub, . , , Quick Start Guide .
, - .
. , , -. ClickHouse, , ? , .. k8s – .
. , , , . demo.
. Storage , storage . .
. . , .
. – Pod, Service-a, StatefulSet.
, , .
. StatefulSet, Pod, ConfigMap , ConfigMap . .
– Load Balancer Service , .
. .
, . .
, . . . . , .
, . Storage , storage , .
YAML- , .
. Pod, Service-a , , 2 StatefulSet-. 2 StatefulSet-?
– , pod.
. , .
StatefulSet ? , Kubernetes Pod’.
StatefulSet, Pod’ . – Template. StatefulSet Pod’. « Pod’».
, StatefulSet. , . . , . . ClickHouse, . , StatefulSet rolling update, , , - .
, rolling update, ClickHouse, storage. , , - , , , . - , StatefulSet , .
, . StatefulSet. , . . , , . , , 2 StatefulSet’ 2 Pod’ , - .
. , .. - ClickHouse Kubernetes. .
YAML , . YAML ClickHouse, .
. . . ClickHouse. .
ConfigMap. ConfigMap , , . .
. . . . . , , . .
?
ZooKeeper. ClickHouse ZooKeeper. ZooKeeper , ClickHouse , ClickHouse .
ZooKeeper . ZooKeeper , . , . , .
. Kubernetes . ClickHouse. ZooKeeper . ClickHouse, ZooKeeper. . . .
, ClickHouse k8s.
, , .
. – ZooKeeper, Kubernetes, . . . .. . 4 pod’. storage , . Storage – .
.
. . 4- , , . ZooKeeper. .
. Persistent Storage.
Persistent Storage .
, cloud-, , Amazon, Google, storage. , .
. local storage, . , .
, cloud storage.
. . , , , storage - , - . .
. - . , - . , , .
.. ClickHouse , , , , .
, local storage.
Kubernetes local storage Kubernetes. :
- EmptyDir
- HostPath.
- Local
, , .
-, storage – , k8s . .
, . . emptyDir. ? ( – ) .
- , . .
? , .. .
. Persistent . Persistent . Kubernetes - Pod , .
, , - .
. hostPath. , . Kubernetes . . , .
. Persistent, . - .
. . Kubernetes Pod . DevOps. , pod’ , - , . .
, , . : « , instance ClickHouse - ».
, Kubernetes , , .
local. . , pod’ , - , Kubernetes. .
. YAML template. storage. . VolumeClaim template k8s. , storage .
k8s storage. StatefulSet. ClickHouse.
. Persistent Storage , , .
. ClickHouse on k8s . , , ZooKeeper, Persistent, . .
. . , ClickHouse.
– ClickHouse . , , , - , , , , , .
?
. pod’. , . .. , , , ClickHouse, storage. , .
. , ClickHouse-operator ClickHouse.
, , , K8s.
K8s . , kubectl apply? API etcd .
Kubernetes: pod, StatefulSet, service .
. .
. – k8s, . , . , , , .
K8s.
pod-, StatefulSet-, ClickHouseInstallation, . . ClickHouse, . .
K8s . , - , pod’ StatefulSet .
? -, Custom Resource Definition. ? K8s, , pod, StatefulSet , . .
kubectl apply . Kubernetes .
, etcd ClickHouseInstallation.
. . . YAML-, , «kubectl apply», Kubernetes , etcd : «, , . ClickHouseInstallation ».
, -, Kubernetes . Kubernetes, . , .
- . Kubernetes, K8s. , , Kubernetes, , .
, , Kubernetes API. API. , , . .
? , , . , K8s.
– . . Kubernetes API . Kubernetes API , . - K8s , Kubernetes , .. API , .
, - . – .
. YAML- ClickHouseInstallation. kubectl apply etcd. event, event ClickHouse-operator. . - . ClickHouseInstallation, . – .
? -, , . , .. YAML-, . , .
, pod’, , .. , . ClickHouse Kubernetes.
. Kubernetes , .. Kubernetes, .
Kubernetes , .. , system-scope. Kubernetes , pod’, , mount volumes, ConfigMap, .. , .
. . ClickHouse.
, , , . .
, , .
– . ? , StatefulSet, - , volume claim.
K8s. , ConfigMap, StatefulSet, Volume. Kubernetes . , .
ClickHouse-operator. pod, - . ClickHouse-operator . .. ClickHouse , , -, , . , -, , . .
ClickHouse, .. . . instance, , .
.
. , .
, xml, ClickHouse , .
ClickHouse. zoned deployment – , hostPath, local storage. zoned deployment.
– .
, .
. . . , . ClickHouse Prometheus, Grafana.
? - ? . , .
, - , . – , .. . . . .
? .
.
.
. .
Grafana dashboard, .
, Grafana dashboard . . DevOps .
? :
- . – .
- ZooKeeper. ZooKeeper-operator. .. ZooKeeper , .
- .
- , Templates – DONE, . . . , .
- . Re-sharding.
.
? ? Kubernetes Alitnity- .
:
- , , .
- .
- . . .
. Kubernetes, . , , ClickHouse ?
– ! , .
, TSBS. ? . , .
? . . , . .
. . :
- TimescaleDB.
- InfluxDB.
- ClickHouse.
. RedShift. Amazon. ClickHouse .
, ?
- DB Kubernetes . , , , . ClickHouse Kubernetes .
- .
- .
- , , .
Open source – !
, – open source , , . ! !
!
! . SEMrush. , . , , . , , . , . .
, . . todo. . , . . . , , , . . . , , . – , , , , . , pull request, .
! ! , Persistent Volumes. , - , ? , , , ClickHouse , ?
, – local storage, , hostPath. , , pod - , , - . , , .
. , , provisioning volumes. local storage provision , DevOps , volumes. Kubernetes provisioning, Persistent volumes - , - . Kubernetes, pod’, - local storage, labels - . - label one per host instance. , pod’ Kubernetes’ , , labels, . labels, provisioning . .
local . , , .
, . Kubernetes , . , , , ?
, Kubernetes , pod’ – cattle, - . , . Kubernetes , , .
. , , ? . ClickHouse , , .. ClickHouse.
? , DevOps. , . ClickHouse . , . , Kubernetes. ClickHouse.
, ? , , , labels. , Kubernetes instance pod’. Kubernetes . pod’ . , . ClickHouse , , . .. .
! , , , - ?
, , ?
. .
, Kubernetes. Kubernetes . . – , , replay , . . .
! ! , . haproxy? - , , ClickHouse.
Ingress?
, Ingress haproxy. haproxy , .
. , , , , . . – , . , . use case , , issues GitHub , .
.
. . haproxy todo. todo , . , , .