[bitnami/external-dns] IRSA docs added (#4682)

* IRSA docs added

* Version bump

* Added example arguments

* Updated version

* Removed new line

* Added new line in yaml file + removed line in docs

Co-authored-by: Anton Aleksandrov <[email protected]>

Author: AntonAleksandrov13

bitnami/external-dns/Chart.yaml

@@ -24,4 +24,4 @@ sources:
   - https://github.com/kubernetes-sigs/external-dns
   - https://github.com/bitnami/bitnami-docker-external-dns
   - https://github.com/kubernetes-sigs/external-dns
-version: 4.5.1
+version: 4.5.2

bitnami/external-dns/README.md

@@ -263,6 +263,12 @@ This chart allows you to set your custom affinity using the `affinity` parameter
 
 As an alternative, you can use of the preset configurations for pod affinity, pod anti-affinity, and node affinity available at the [bitnami/common](https://github.com/bitnami/charts/tree/master/bitnami/common#affinities) chart. To do so, set the `podAffinityPreset`, `podAntiAffinityPreset`, or `nodeAffinityPreset` parameters.
 
+### Using IRSA
+If you are deploying to AWS EKS and you want to leverage [IRSA](https://docs.aws.amazon.com/eks/latest/userguide/iam-roles-for-service-accounts.html). You will need to override `fsGroup` and `runAsUser` with `65534`(nfsnobody) and `0` respectively. Otherwise service account token will not be properly mounted.
+You can use the following arguments:
+```
+--set podSecurityContext.fsGroup=65534 --set podSecurityContext.runAsUser=0
+```
 ## Tutorials
 
 Find information about the requirements for each DNS provider on the link below:
@@ -276,7 +282,6 @@ For instance, to install ExternalDNS on AWS, you need to:
 - Install ExternalDNS chart using the command below:
 
 > Note: replace the placeholder HOSTED_ZONE_IDENTIFIER and HOSTED_ZONE_NAME, with your hosted zoned identifier and name, respectively.
-
 ```bash
 $ helm install my-release \
   --set provider=aws \
@@ -286,6 +291,7 @@ $ helm install my-release \
   bitnami/external-dns
 ```
 
+
 ## Troubleshooting
 
 Find more information about how to deal with common errors related to Bitnami’s Helm charts in [this troubleshooting guide](https://docs.bitnami.com/general/how-to/troubleshoot-helm-chart-issues).
@@ -344,4 +350,4 @@ Other mayor changes included in this major version are:
   - `aws.accessKey` -> `aws.credentials.accessKey`
   - `aws.credentialsPath` -> `aws.credentials.mountPath`
   - `designate.customCA.directory` -> `designate.customCA.mountPath`
-- Support to Prometheus metrics is added.
+- Support to Prometheus metrics is added.