Operator SDK

Operator SDK and Kubebuilder, which it uses underneath, offer a skeleton, code generation and tools for writing operators in Go. Creating the project, adding an API (CRD + type) and a controller take a few commands:

operator-sdk init --domain ornek.com --repo github.com/ali/yedek-operator
operator-sdk create api --group yedek --version v1 --kind Yedek --resource --controller
make manifests        # generates the CRD YAML from Go types
make install          # installs the CRD into the cluster
make run              # runs the controller locally

There are also Ansible- and Helm-based operator types; Go is the most flexible.

The comment markers on Go structs turn into the CRD's validation rules and printer columns:

type YedekSpec struct {
    // +kubebuilder:validation:MinLength=1
    Veritabani string `json:"veritabani"`
    Takvim     string `json:"takvim"`
    // +kubebuilder:validation:Minimum=1
    // +kubebuilder:default=7
    SaklamaGun int32 `json:"saklamaGun,omitempty"`
}

// +kubebuilder:subresource:status
// +kubebuilder:printcolumn:name="Takvim",type=string,JSONPath=`.spec.takvim`
type Yedek struct { ... }