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Steps

# build operaotr-sdk

$ cd $GOPATH/src/github.com/operator-framework/operator-sdk
$ git checkout master
$ make dep
$ make install
# generate project
OPERATOR_NAME=echo-operator
GROUP=echo.redhat.com
VERSION=v1
KIND=EchoApp

$ cd $GOPATH/src/github.com/{user name}/
$ operator-sdk new ${OPERATOR_NAME} --api-version=${GROUP}/${VERSION} --kind=${KIND}
$ cd ${OPERATOR_NAME}

# build and push image
REGISTRY=docker.io
ORG=tohinkashem
TAG=v0.0.1

$ operator-sdk build ${REGISTRY}/${ORG}/${OPERATOR_NAME}:${TAG}

$ docker push ${REGISTRY}/${ORG}/${OPERATOR_NAME}:${TAG}

# add fields to custom types

type EchoApp struct {
	metav1.TypeMeta   `json:",inline"`
	metav1.ObjectMeta `json:"metadata"`
	Spec              EchoAppSpec   `json:"spec"`
	Status            EchoAppStatus `json:"status,omitempty"`
}

type EchoAppSpec struct {
	Size  int32  `json:"size"`
	Image string `json:"image"`
}
type EchoAppStatus struct {
	Nodes []string `json:"nodes"`
}
$ operator-sdk generate k8s