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coredns_injection.go
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coredns_injection.go
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package pods
import (
v1 "k8s.io/api/core/v1"
"k8s.io/apimachinery/pkg/api/resource"
)
//InjectCorednsWithSharedFolder - Injects coredns container and configure the DnsConfig for template.
//Also makes shared folder between coredns container and first container of template
func InjectCorednsWithSharedFolder(template *v1.Pod) {
template.Spec.Containers = append(template.Spec.Containers,
v1.Container{
Name: "coredns",
Image: "networkservicemesh/coredns:master",
ImagePullPolicy: v1.PullIfNotPresent,
Args: []string{"-conf", "/etc/coredns/Corefile"},
Resources: v1.ResourceRequirements{
Limits: v1.ResourceList{
"networkservicemesh.io/socket": resource.NewQuantity(1, resource.DecimalSI).DeepCopy(),
},
},
VolumeMounts: []v1.VolumeMount{{
ReadOnly: false,
Name: "empty-dir-volume",
MountPath: "/etc/coredns",
}},
})
template.Spec.Containers[0].VolumeMounts = []v1.VolumeMount{{
ReadOnly: false,
Name: "empty-dir-volume",
MountPath: "/etc/coredns",
}}
template.Spec.Volumes = append(template.Spec.Volumes, v1.Volume{
Name: "empty-dir-volume",
VolumeSource: v1.VolumeSource{
EmptyDir: &v1.EmptyDirVolumeSource{
Medium: v1.StorageMediumDefault,
SizeLimit: nil,
},
},
})
template.Spec.InitContainers = append([]v1.Container{newDNSInitContainer(nil)}, template.Spec.InitContainers...)
}
//InjectCoredns - Injects coredns container and configure the DnsConfig for template.
func InjectCoredns(pod *v1.Pod, corednsConfigName string) *v1.Pod {
pod.Spec.Containers = append(pod.Spec.Containers,
v1.Container{
Name: "coredns",
Image: "networkservicemesh/coredns:master",
ImagePullPolicy: v1.PullIfNotPresent,
Args: []string{"-conf", "/etc/coredns/Corefile"},
VolumeMounts: []v1.VolumeMount{{
ReadOnly: false,
Name: "config-volume",
MountPath: "/etc/coredns",
}},
Resources: v1.ResourceRequirements{
Limits: v1.ResourceList{
"networkservicemesh.io/socket": resource.NewQuantity(1, resource.DecimalSI).DeepCopy(),
},
},
})
pod.Spec.Volumes = append(pod.Spec.Volumes, v1.Volume{
Name: "config-volume",
VolumeSource: v1.VolumeSource{
ConfigMap: &v1.ConfigMapVolumeSource{
LocalObjectReference: v1.LocalObjectReference{Name: corednsConfigName},
Items: []v1.KeyToPath{{
Key: "Corefile",
Path: "Corefile",
}},
},
},
})
return pod
}