Resources
The clickhouse-operator creates the following resources on installation to support its functions:
- Custom Resource Definition
- Service account
- Cluster Role Binding
- Deployment
Custom Resource Definition
The Kubernetes k8s API is extended with the new Kubernetes Cluster Resource Definition kind:ClickHouseInstallation.
To check the Custom Resource Definition:
kubectl get customresourcedefinitions
Expected result:
NAME CREATED AT
clickhouseinstallations.clickhouse.altinity.com 2020-12-28T19:28:08Z
clickhouseinstallationtemplates.clickhouse.altinity.com 2020-12-28T19:28:08Z
clickhouseoperatorconfigurations.clickhouse.altinity.com 2020-12-28T19:28:08Z
Service Account
The new Service Account clickhouse-operator allows services running from within Pods to be authenticated against the Service Account clickhouse-operator through the apiserver.
To check the Service Account:
kubectl get serviceaccounts -n kube-system
Expected result
NAME SECRETS AGE
(Other Service Accounts)
clickhouse-operator 1 27h
(Other Service Accounts)
Cluster Role Binding
The Cluster Role Binding cluster-operator grants permissions defined in a role to a set of users.
Roles are granted to users, groups or service account. These permissions are granted cluster-wide with ClusterRoleBinding.
To check the Cluster Role Binding:
kubectl get clusterrolebinding
Expected result
NAME ROLE AGE
(Other Cluster Role Bindings)
clickhouse-operator-kube-system ClusterRole/cluster-admin 90m
(Other Cluster Role Bindings)
Cluster Role Binding Example
As an example, the role cluster-admin is granted to a service account cliskhouse-operator:
roleRef:
apiGroup: rbac.authorization.k8s.io
kind: ClusterRole
name: cluster-admin
subjects:
- kind: ServiceAccount
name: clickhouse-operator
namespace: kube-system
Deployment
The Deployment clickhouse-operator runs in the kube-system namespace.
To check the Deployment:
kubectl get deployments --namespace kube-system
Expected result
NAME READY UP-TO-DATE AVAILABLE AGE
(Other Deployments)
clickhouse-operator 1/1 1 1 96m
(Other Deployments)
References
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