feat: add HostAliases support to Fluent Bit and Fluentd specifications

apis/fluentbit/v1alpha2/fluentbit_types.go

@@ -107,6 +107,8 @@ type FluentBitSpec struct {
 	SchedulerName string `json:"schedulerName,omitempty"`
 	// Optional duration in seconds the pod needs to terminate gracefully. Value must be non-negative integer.
 	TerminationGracePeriodSeconds *int64 `json:"terminationGracePeriodSeconds,omitempty"`
+	// HostAliases is an optional list of IPs and hostnames that will be injected into the pod's hosts file if specified.
+	HostAliases []corev1.HostAlias `json:"hostAliases,omitempty"`
 }
 
 // FluentBitService defines the service of the FluentBit

apis/fluentd/v1alpha1/fluentd_types.go

@@ -117,6 +117,8 @@ type FluentdSpec struct {
 	LivenessProbe *corev1.Probe `json:"livenessProbe,omitempty"`
 	// ReadinessProbe represents the readiness probe for the fluentd container.
 	ReadinessProbe *corev1.Probe `json:"readinessProbe,omitempty"`
+	// HostAliases is an optional list of IPs and hostnames that will be injected into the pod's hosts file if specified.
+	HostAliases []corev1.HostAlias `json:"hostAliases,omitempty"`
 }
 
 // FluentDService the service of the FluentD

charts/fluent-operator/charts/fluent-bit-crds/crds/fluentbit.fluent.io_fluentbits.yaml

@@ -1310,6 +1310,27 @@ spec:
               fluentBitConfigName:
                 description: Fluentbitconfig object associated with this Fluentbit
                 type: string
+              hostAliases:
+                description: HostAliases is an optional list of IPs and hostnames
+                  that will be injected into the pod's hosts file if specified.
+                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
               hostNetwork:
                 description: Host networking is requested for this pod. Use the host's
                   network namespace. If this option is set, the ports that will be

charts/fluent-operator/charts/fluentd-crds/crds/fluentd.fluent.io_fluentds.yaml

@@ -2813,6 +2813,27 @@ spec:
                       type: object
                   type: object
                 type: array
+              hostAliases:
+                description: HostAliases is an optional list of IPs and hostnames
+                  that will be injected into the pod's hosts file if specified.
+                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
               image:
                 description: Fluentd image.
                 type: string

config/crd/bases/fluentbit.fluent.io_fluentbits.yaml

@@ -1310,6 +1310,27 @@ spec:
               fluentBitConfigName:
                 description: Fluentbitconfig object associated with this Fluentbit
                 type: string
+              hostAliases:
+                description: HostAliases is an optional list of IPs and hostnames
+                  that will be injected into the pod's hosts file if specified.
+                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
               hostNetwork:
                 description: Host networking is requested for this pod. Use the host's
                   network namespace. If this option is set, the ports that will be

config/crd/bases/fluentd.fluent.io_fluentds.yaml

@@ -2813,6 +2813,27 @@ spec:
                       type: object
                   type: object
                 type: array
+              hostAliases:
+                description: HostAliases is an optional list of IPs and hostnames
+                  that will be injected into the pod's hosts file if specified.
+                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
               image:
                 description: Fluentd image.
                 type: string

docs/fluentbit.md

@@ -432,6 +432,7 @@ FluentBitSpec defines the desired state of FluentBit
 | service | Service represents configurations on the fluent-bit service. | [FluentBitService](#fluentbitservice) |
 | schedulerName | SchedulerName represents the desired scheduler for fluent-bit pods. | string |
 | terminationGracePeriodSeconds | Optional duration in seconds the pod needs to terminate gracefully. Value must be non-negative integer. | *int64 |
+| hostAliases | HostAliases is an optional list of IPs and hostnames that will be injected into the pod's hosts file if specified. | [][corev1.HostAlias](https://kubernetes.io/docs/reference/generated/kubernetes-api/v1.31/#hostalias-v1-core) |
 
 [Back to TOC](#table-of-contents)
 # InputSpec

docs/fluentd.md

@@ -362,6 +362,7 @@ FluentdSpec defines the desired state of Fluentd
 | positionDB | Storage for position db. You will use it if tail input is enabled. Applicable when the mode is \"agent\", and will be ignored when the mode is \"collector\" | [corev1.VolumeSource](https://kubernetes.io/docs/reference/generated/kubernetes-api/v1.31/#volumesource-v1-core) |
 | livenessProbe | LivenessProbe represents the liveness probe for the fluentd container. | *[corev1.Probe](https://kubernetes.io/docs/reference/generated/kubernetes-api/v1.31/#probe-v1-core) |
 | readinessProbe | ReadinessProbe represents the readiness probe for the fluentd container. | *[corev1.Probe](https://kubernetes.io/docs/reference/generated/kubernetes-api/v1.31/#probe-v1-core) |
+| hostAliases | HostAliases is an optional list of IPs and hostnames that will be injected into the pod's hosts file if specified. | [][corev1.HostAlias](https://kubernetes.io/docs/reference/generated/kubernetes-api/v1.31/#hostalias-v1-core) |
 
 [Back to TOC](#table-of-contents)
 # FluentdStatus

manifests/setup/fluent-operator-crd.yaml

@@ -17892,6 +17892,27 @@ spec:
               fluentBitConfigName:
                 description: Fluentbitconfig object associated with this Fluentbit
                 type: string
+              hostAliases:
+                description: HostAliases is an optional list of IPs and hostnames
+                  that will be injected into the pod's hosts file if specified.
+                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
               hostNetwork:
                 description: Host networking is requested for this pod. Use the host's
                   network namespace. If this option is set, the ports that will be
@@ -26937,6 +26958,27 @@ spec:
                       type: object
                   type: object
                 type: array
+              hostAliases:
+                description: HostAliases is an optional list of IPs and hostnames
+                  that will be injected into the pod's hosts file if specified.
+                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
               image:
                 description: Fluentd image.
                 type: string

manifests/setup/setup.yaml

@@ -17892,6 +17892,27 @@ spec:
               fluentBitConfigName:
                 description: Fluentbitconfig object associated with this Fluentbit
                 type: string
+              hostAliases:
+                description: HostAliases is an optional list of IPs and hostnames
+                  that will be injected into the pod's hosts file if specified.
+                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
               hostNetwork:
                 description: Host networking is requested for this pod. Use the host's
                   network namespace. If this option is set, the ports that will be
@@ -26937,6 +26958,27 @@ spec:
                       type: object
                   type: object
                 type: array
+              hostAliases:
+                description: HostAliases is an optional list of IPs and hostnames
+                  that will be injected into the pod's hosts file if specified.
+                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
               image:
                 description: Fluentd image.
                 type: string

pkg/operator/daemonset.go

@@ -94,6 +94,7 @@ func MakeDaemonSet(fb fluentbitv1alpha2.FluentBit, logPath string) *appsv1.Daemo
 					SecurityContext:               fb.Spec.SecurityContext,
 					HostNetwork:                   fb.Spec.HostNetwork,
 					TerminationGracePeriodSeconds: fb.Spec.TerminationGracePeriodSeconds,
+					HostAliases:                   fb.Spec.HostAliases,
 				},
 			},
 		},

pkg/operator/fluentd-daemonset.go

@@ -114,6 +114,7 @@ func MakeFluentdDaemonSet(fd fluentdv1alpha1.Fluentd) *appsv1.DaemonSet {
 					NodeSelector: fd.Spec.NodeSelector,
 					Tolerations:  fd.Spec.Tolerations,
 					Affinity:     fd.Spec.Affinity,
+					HostAliases:  fd.Spec.HostAliases,
 				},
 			},
 		},

pkg/operator/sts.go

@@ -112,6 +112,7 @@ func MakeStatefulSet(fd fluentdv1alpha1.Fluentd) *appsv1.StatefulSet {
 							LivenessProbe:  fd.Spec.LivenessProbe,
 						},
 					},
+					HostAliases:  fd.Spec.HostAliases,
 					NodeSelector: fd.Spec.NodeSelector,
 					Tolerations:  fd.Spec.Tolerations,
 					Affinity:     fd.Spec.Affinity,