feat: add HostAliases support to Fluent Bit and Fluentd specifications

Signed-off-by: Tomáš Novák <[email protected]>
fluent · Nov 19, 2024 · 30e77bf · 30e77bf
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diff --git a/apis/fluentbit/v1alpha2/fluentbit_types.go b/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

diff --git a/apis/fluentd/v1alpha1/fluentd_types.go b/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

diff --git a/charts/fluent-operator/charts/fluent-bit-crds/crds/fluentbit.fluent.io_fluentbits.yaml b/charts/fluent-operator/charts/fluent-bit-crds/crds/fluentbit.fluent.io_fluentbits.yaml
@@ -1315,6 +1315,32 @@ spec:
                   network namespace. If this option is set, the ports that will be
                   used must be specified. Default to false.
                 type: boolean
+              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
+                  properties:
+                    ip:
+                      description: IP address of the host file entry.
+                      pattern: "^(25[0-5]|2[0-4][0-9]|1[0-9]{2}|[1-9]?[0-9])\\.(25[0-5]|2[0-4][0-9]|1[0-9]{2}|[1-9]?[0-9])\\.(25[0-5]|2[0-4][0-9]|1[0-9]{2}|[1-9]?[0-9])\\.(25[0-5]|2[0-4][0-9]|1[0-9]{2}|[1-9]?[0-9])$"
+                      type: string
+                    hostnames:
+                      description: Hostnames for the above IP address.
+                      items:
+                        type: string
+                        pattern: "^[a-zA-Z0-9.-]+$"
+                      minItems: 1
+                      type: array
+                      x-kubernetes-list-type: atomic
+                  type: object
+                  required:
+                    - ip
+                    - hostnames
+                  x-kubernetes-list-map-keys:
+                  - ip
+                  x-kubernetes-list-type: map
+                type: array
               image:
                 description: Fluent Bit image.
                 type: string

diff --git a/charts/fluent-operator/charts/fluentd-crds/crds/fluentd.fluent.io_fluentds.yaml b/charts/fluent-operator/charts/fluentd-crds/crds/fluentd.fluent.io_fluentds.yaml
@@ -2813,6 +2813,32 @@ 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
+                  properties:
+                    ip:
+                      description: IP address of the host file entry.
+                      pattern: "^(25[0-5]|2[0-4][0-9]|1[0-9]{2}|[1-9]?[0-9])\\.(25[0-5]|2[0-4][0-9]|1[0-9]{2}|[1-9]?[0-9])\\.(25[0-5]|2[0-4][0-9]|1[0-9]{2}|[1-9]?[0-9])\\.(25[0-5]|2[0-4][0-9]|1[0-9]{2}|[1-9]?[0-9])$"
+                      type: string
+                    hostnames:
+                      description: Hostnames for the above IP address.
+                      items:
+                        type: string
+                        pattern: "^[a-zA-Z0-9.-]+$"
+                      minItems: 1
+                      type: array
+                      x-kubernetes-list-type: atomic
+                  type: object
+                  required:
+                    - ip
+                    - hostnames
+                  x-kubernetes-list-map-keys:
+                  - ip
+                  x-kubernetes-list-type: map
+                type: array
               image:
                 description: Fluentd image.
                 type: string

diff --git a/config/crd/bases/fluentbit.fluent.io_fluentbits.yaml b/config/crd/bases/fluentbit.fluent.io_fluentbits.yaml
@@ -1315,6 +1315,32 @@ spec:
                   network namespace. If this option is set, the ports that will be
                   used must be specified. Default to false.
                 type: boolean
+              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
+                  properties:
+                    ip:
+                      description: IP address of the host file entry.
+                      pattern: "^(25[0-5]|2[0-4][0-9]|1[0-9]{2}|[1-9]?[0-9])\\.(25[0-5]|2[0-4][0-9]|1[0-9]{2}|[1-9]?[0-9])\\.(25[0-5]|2[0-4][0-9]|1[0-9]{2}|[1-9]?[0-9])\\.(25[0-5]|2[0-4][0-9]|1[0-9]{2}|[1-9]?[0-9])$"
+                      type: string
+                    hostnames:
+                      description: Hostnames for the above IP address.
+                      items:
+                        type: string
+                        pattern: "^[a-zA-Z0-9.-]+$"
+                      minItems: 1
+                      type: array
+                      x-kubernetes-list-type: atomic
+                  type: object
+                  required:
+                    - ip
+                    - hostnames
+                  x-kubernetes-list-map-keys:
+                  - ip
+                  x-kubernetes-list-type: map
+                type: array
               image:
                 description: Fluent Bit image.
                 type: string

diff --git a/config/crd/bases/fluentd.fluent.io_fluentds.yaml b/config/crd/bases/fluentd.fluent.io_fluentds.yaml
@@ -2813,6 +2813,32 @@ 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
+                  properties:
+                    ip:
+                      description: IP address of the host file entry.
+                      pattern: "^(25[0-5]|2[0-4][0-9]|1[0-9]{2}|[1-9]?[0-9])\\.(25[0-5]|2[0-4][0-9]|1[0-9]{2}|[1-9]?[0-9])\\.(25[0-5]|2[0-4][0-9]|1[0-9]{2}|[1-9]?[0-9])\\.(25[0-5]|2[0-4][0-9]|1[0-9]{2}|[1-9]?[0-9])$"
+                      type: string
+                    hostnames:
+                      description: Hostnames for the above IP address.
+                      items:
+                        type: string
+                        pattern: "^[a-zA-Z0-9.-]+$"
+                      minItems: 1
+                      type: array
+                      x-kubernetes-list-type: atomic
+                  type: object
+                  required:
+                    - ip
+                    - hostnames
+                  x-kubernetes-list-map-keys:
+                  - ip
+                  x-kubernetes-list-type: map
+                type: array
               image:
                 description: Fluentd image.
                 type: string

diff --git a/docs/fluentbit.md b/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

diff --git a/docs/fluentd.md b/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

diff --git a/pkg/operator/daemonset.go b/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,
 				},
 			},
 		},

diff --git a/pkg/operator/fluentd-daemonset.go b/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,
 				},
 			},
 		},

diff --git a/pkg/operator/sts.go b/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,