unable to create a deployment without replication controller in kubernetes client-go - go

Question

The issue is I cannot create a deployment spec without creating replication controller along with it.I would not like to use replication controller because my app always use only one pod and I would like to set restart policy to never to prevent any terminated container tries to restart.
apiVersion: v1
kind: Pod
metadata:
name: two-containers
spec:
restartPolicy: Never
volumes:
- name: shared-data
emptyDir: {}
containers:
- name: nginx-container
image: nginx
volumeMounts:
- name: shared-data
mountPath: /usr/share/nginx/html
- name: debian-container
image: debian
volumeMounts:
- name: shared-data
mountPath: /pod-data
command: ["/bin/sh"]
args: ["-c", "echo Hello from the debian container > /pod-data/index.html"]
Above is the target yaml file, which I would like to implement and deploy with kubernetes client-go, however client-go currently only provides deployment with replication controller.
// Define Deployments spec.
deploySpec := &v1beta1.Deployment{
TypeMeta: unversioned.TypeMeta{
Kind: "Deployment",
APIVersion: "extensions/v1beta1",
},
ObjectMeta: v1.ObjectMeta{
Name: "binary-search",
},
Spec: v1beta1.DeploymentSpec{
Replicas: int32p(1),
Template: v1.PodTemplateSpec{
ObjectMeta: v1.ObjectMeta{
Name: appName,
Labels: map[string]string{"app": appName},
},
Spec: v1.PodSpec{
Containers: []v1.Container{
v1.Container{
Name: "nginx-container",
Image: "nginx",
VolumeMounts: []v1.VolumeMount{
v1.VolumeMount{
MountPath: "/usr/share/nginx/html",
Name: "shared-data",
},
},
},
v1.Container{
Name: "debian-container",
Image: "debian",
VolumeMounts: []v1.VolumeMount{
v1.VolumeMount{
MountPath: "/pod-data",
Name: "shared-data",
},
},
Command: []string{
"/bin/sh",
},
Args: []string{
"-c",
"echo Hello from the debian container > /pod-data/index1.html",
},
},
},
RestartPolicy: v1.RestartPolicyAlways,
DNSPolicy: v1.DNSClusterFirst,
Volumes: []v1.Volume{
v1.Volume{
Name: "shared-data",
VolumeSource: v1.VolumeSource{
EmptyDir: &v1.EmptyDirVolumeSource{},
},
},
},
},
},
},
}
// Implement deployment update-or-create semantics.
deploy := c.Extensions().Deployments(namespace)
_, err := deploy.Update(deploySpec)
Any suggestion? Many thanks in advance!

Answer 1

If you don't want the service to be restarted, then you can just use the Pod directly. There is no need to use a Deployment, since these only make sense, if you want to have automatic Pod restarts and roll-outs of updates.
The code would look somehow like this (not tested):
podSpec := v1.PodSpec{
Containers: []v1.Container{
v1.Container{
Name: "nginx-container",
Image: "nginx",
VolumeMounts: []v1.VolumeMount{
v1.VolumeMount{
MountPath: "/usr/share/nginx/html",
Name: "shared-data",
},
},
},
v1.Container{
Name: "debian-container",
Image: "debian",
VolumeMounts: []v1.VolumeMount{
v1.VolumeMount{
MountPath: "/pod-data",
Name: "shared-data",
},
},
Command: []string{
"/bin/sh",
},
Args: []string{
"-c",
"echo Hello from the debian container > /pod-data/index1.html",
},
},
},
RestartPolicy: v1.RestartPolicyAlways,
DNSPolicy: v1.DNSClusterFirst,
Volumes: []v1.Volume{
v1.Volume{
Name: "shared-data",
VolumeSource: v1.VolumeSource{
EmptyDir: &v1.EmptyDirVolumeSource{},
},
},
},
}
// Implement deployment update-or-create semantics.
deploy := c.Core().PodsGetter(namespace)
_, err := deploy.Update(podSpec)