Add /etc/hosts alias support

api/v1/runtimecomponent_types.go

@@ -163,6 +163,10 @@ type RuntimeComponentSpec struct {
 	// DNS settings for the pod.
 	// +operator-sdk:csv:customresourcedefinitions:order=29,type=spec,displayName="DNS"
 	DNS *RuntimeComponentDNS `json:"dns,omitempty"`
+
+	// The list of hosts and IPs that will be inejcted into the application pod's hosts file
+	// +operator-sdk:csv:customresourcedefinitions:order=30,type=spec,displayName="Host Aliases"
+	HostAliases *[]corev1.HostAlias `json:"hostAliases,omitempty"`
 }
 
 // Defines the DNS
@@ -1072,6 +1076,10 @@ func (cr *RuntimeComponentTopologySpreadConstraints) GetDisableOperatorDefaults(
 	return cr.DisableOperatorDefaults
 }
 
+func (cr *RuntimeComponent) GetHostAliases() *[]corev1.HostAlias {
+	return cr.Spec.HostAliases
+}
+
 // Initialize the RuntimeComponent instance
 func (cr *RuntimeComponent) Initialize() {
 	if cr.Spec.PullPolicy == nil {

bundle/manifests/rc.app.stacks_runtimecomponents.yaml

@@ -1983,6 +1983,27 @@ spec:
                 description: Expose the application externally via a Route, a Knative
                   Route or an Ingress resource.
                 type: boolean
+              hostAliases:
+                description: The list of hosts and IPs that will be inejcted into
+                  the application pod's hosts file
+                items:
+                  description: |-
+                    HostAlias holds the mapping between IP and hostnames that will be injected as an entry in the
+                    pod's hosts file.
+                  properties:
+                    hostnames:
+                      description: Hostnames for the above IP address.
+                      items:
+                        type: string
+                      type: array
+                      x-kubernetes-list-type: atomic
+                    ip:
+                      description: IP address of the host file entry.
+                      type: string
+                  required:
+                  - ip
+                  type: object
+                type: array
               initContainers:
                 description: List of containers to run before other containers in
                   a pod.

bundle/manifests/runtime-component.clusterserviceversion.yaml

@@ -419,6 +419,10 @@ spec:
       - description: DNS settings for the pod.
         displayName: DNS
         path: dns
+      - description: The list of hosts and IPs that will be inejcted into the application
+          pod's hosts file
+        displayName: Host Aliases
+        path: hostAliases
       - description: Labels to set on ServiceMonitor.
         displayName: Monitoring Labels
         path: monitoring.labels

common/types.go

@@ -260,4 +260,5 @@ type BaseComponent interface {
 	GetDisableServiceLinks() *bool
 	GetTolerations() []corev1.Toleration
 	GetDNS() BaseComponentDNS
+	GetHostAliases() *[]corev1.HostAlias
 }

config/crd/bases/rc.app.stacks_runtimecomponents.yaml

@@ -1979,6 +1979,27 @@ spec:
                 description: Expose the application externally via a Route, a Knative
                   Route or an Ingress resource.
                 type: boolean
+              hostAliases:
+                description: The list of hosts and IPs that will be inejcted into
+                  the application pod's hosts file
+                items:
+                  description: |-
+                    HostAlias holds the mapping between IP and hostnames that will be injected as an entry in the
+                    pod's hosts file.
+                  properties:
+                    hostnames:
+                      description: Hostnames for the above IP address.
+                      items:
+                        type: string
+                      type: array
+                      x-kubernetes-list-type: atomic
+                    ip:
+                      description: IP address of the host file entry.
+                      type: string
+                  required:
+                  - ip
+                  type: object
+                type: array
               initContainers:
                 description: List of containers to run before other containers in
                   a pod.

config/manifests/bases/runtime-component.clusterserviceversion.yaml

@@ -353,6 +353,10 @@ spec:
       - description: DNS settings for the pod.
         displayName: DNS
         path: dns
+      - description: The list of hosts and IPs that will be inejcted into the application
+          pod's hosts file
+        displayName: Host Aliases
+        path: hostAliases
       - description: Labels to set on ServiceMonitor.
         displayName: Monitoring Labels
         path: monitoring.labels

internal/deploy/kubectl/runtime-component-crd.yaml

@@ -1982,6 +1982,27 @@ spec:
                 description: Expose the application externally via a Route, a Knative
                   Route or an Ingress resource.
                 type: boolean
+              hostAliases:
+                description: The list of hosts and IPs that will be inejcted into
+                  the application pod's hosts file
+                items:
+                  description: |-
+                    HostAlias holds the mapping between IP and hostnames that will be injected as an entry in the
+                    pod's hosts file.
+                  properties:
+                    hostnames:
+                      description: Hostnames for the above IP address.
+                      items:
+                        type: string
+                      type: array
+                      x-kubernetes-list-type: atomic
+                    ip:
+                      description: IP address of the host file entry.
+                      type: string
+                  required:
+                  - ip
+                  type: object
+                type: array
               initContainers:
                 description: List of containers to run before other containers in
                   a pod.

internal/deploy/kustomize/daily/base/runtime-component-crd.yaml

@@ -1982,6 +1982,27 @@ spec:
                 description: Expose the application externally via a Route, a Knative
                   Route or an Ingress resource.
                 type: boolean
+              hostAliases:
+                description: The list of hosts and IPs that will be inejcted into
+                  the application pod's hosts file
+                items:
+                  description: |-
+                    HostAlias holds the mapping between IP and hostnames that will be injected as an entry in the
+                    pod's hosts file.
+                  properties:
+                    hostnames:
+                      description: Hostnames for the above IP address.
+                      items:
+                        type: string
+                      type: array
+                      x-kubernetes-list-type: atomic
+                    ip:
+                      description: IP address of the host file entry.
+                      type: string
+                  required:
+                  - ip
+                  type: object
+                type: array
               initContainers:
                 description: List of containers to run before other containers in
                   a pod.

utils/utils.go

@@ -702,6 +702,10 @@ func CustomizePodSpec(pts *corev1.PodTemplateSpec, ba common.BaseComponent) {
 	appContainer.Env = ba.GetEnv()
 	appContainer.EnvFrom = ba.GetEnvFrom()
 
+	if ba.GetHostAliases() != nil {
+		pts.Spec.HostAliases = *ba.GetHostAliases()
+	}
+
 	pts.Spec.InitContainers = ba.GetInitContainers()
 
 	appContainer.VolumeMounts = ba.GetVolumeMounts()