add HostAliases field to PodSpec to support adding entries into hosts file

pkg/api/types.go

@@ -2099,6 +2099,17 @@ type PodSpec struct {
 	// If specified, the pod's tolerations.
 	// +optional
 	Tolerations []Toleration
+	// HostAliases is an optional list of hosts and IPs that will be injected into the pod's hosts
+	// file if specified. This is only valid for non-hostNetwork pods.
+	// +optional
+	HostAliases []HostAlias
+}
+
+// HostAlias holds the mapping between IP and hostnames that will be injected as an entry in the
+// pod's hosts file.
+type HostAlias struct {
+	IP        string
+	Hostnames []string
 }
 
 // Sysctl defines a kernel parameter to be set

pkg/api/v1/types.go

@@ -2406,6 +2406,21 @@ type PodSpec struct {
 	// If specified, the pod's tolerations.
 	// +optional
 	Tolerations []Toleration `json:"tolerations,omitempty" protobuf:"bytes,22,opt,name=tolerations"`
+	// HostAliases is an optional list of hosts and IPs that will be injected into the pod's hosts
+	// file if specified. This is only valid for non-hostNetwork pods.
+	// +optional
+	// +patchMergeKey=IP
+	// +patchStrategy=merge
+	HostAliases []HostAlias `json:"hostMappings,omitempty" patchStrategy:"merge" patchMergeKey:"IP" protobuf:"bytes,23,rep,name=hostMappings"`
+}
+
+// HostAlias holds the mapping between IP and hostnames that will be injected as an entry in the
+// pod's hosts file.
+type HostAlias struct {
+	// IP address of the host file entry.
+	IP string `json:"ip,omitempty" protobuf:"bytes,1,opt,name=ip"`
+	// Hostnames for the the above IP address.
+	Hostnames []string `json:"hostnames,omitempty" protobuf:"bytes,2,rep,name=hostnames"`
 }
 
 // PodSecurityContext holds pod-level security attributes and common container settings.