[stable/fluent-bit] Add support for init containers (#23074)

* [stable/fluent-bit] Implement support for init containers

Signed-off-by: Pavel Dmytrenko <dmytrenko.pavel@gmail.com>

* [stable/fluent-bit] Update README

Signed-off-by: Pavel Dmytrenko <dmytrenko.pavel@gmail.com>

* [stable/fluent-bit] Bump chart version

Signed-off-by: Pavel Dmytrenko <dmytrenko.pavel@gmail.com>

* [stable/fluent-bit] Resolve conflict

Signed-off-by: Pavel Dmytrenko <dmytrenko.pavel@gmail.com>

stable/fluent-bit/Chart.yaml

@@ -1,6 +1,6 @@
 apiVersion: v1
 name: fluent-bit
-version: 2.9.0
+version: 2.10.0
 appVersion: 1.3.7
 description: Fast and Lightweight Log/Data Forwarder for Linux, BSD and OSX
 keywords:

stable/fluent-bit/README.md

@@ -112,6 +112,7 @@ The following table lists the configurable parameters of the Fluent-Bit chart an
 | `extraPorts`                       | List of extra ports                        |                       |
 | `extraVolumeMounts`                | Mount an extra volume, required to mount ssl certificates when elasticsearch has tls enabled |          |
 | `extraVolume`                      | Extra volume                               |                                                |
+| `initContainers`                   | Init containers                            | `{}`                                           |
 | `service.flush`                    | Interval to flush output (seconds)        | `1`                   |
 | `service.logLevel`                 | Diagnostic level (error/warning/info/debug/trace)        | `info`                   |
 | `filter.enableExclude`             | Enable the use of monitoring for a pod annotation of `fluentbit.io/exclude: true`. If present, discard logs from that pod.         | `true`                                 |

stable/fluent-bit/templates/daemonset.yaml

@@ -49,6 +49,13 @@ spec:
 {{ toYaml .Values.dnsConfig | indent 8 }}
 {{- end }}
       serviceAccountName: {{ template "fluent-bit.serviceAccountName" . }}
+{{- if .Values.initContainers }}
+      initContainers:
+{{- range $key, $value := .Values.initContainers }}
+      - name: "{{ $key }}"
+{{ toYaml $value | indent 8 }}
+{{- end }}
+{{- end }}
       containers:
       - name: fluent-bit
         image: "{{ .Values.image.fluent_bit.repository }}:{{ .Values.image.fluent_bit.tag }}"

stable/fluent-bit/values.yaml

@@ -331,3 +331,21 @@ securityContext: {}
 podSecurityContext: {}
   # podSecurityContext:
   #   runAsUser: 1000
+
+## Add your own init container (example installation of Lua filter plugin)
+## Ref: https://kubernetes.io/docs/concepts/workloads/pods/init-containers/
+initContainers: {}
+  # load-plugin:
+  #   image: "appropriate/curl:latest"
+  #   imagePullPolicy: "IfNotPresent"
+  #   # Assumed plugins volume is configured at Pod level via extraVolumes
+  #   volumeMounts:
+  #     - name: plugins
+  #       mountPath: /fluent-bit/plugins
+  #   command:
+  #     - "/bin/sh"
+  #     - "-c"
+  #     - |
+  #       curl -sS <download-url> -o /plugin.zip
+  #       unzip /plugin.zip
+  #       cp -av <plugin-zip-contents> /fluent-bit/plugins/