How can I tell Helm Chart to ignore the default Ingress-Nginx and create a custom one?

When deploying an application with Helm, you might encounter issues when it tries to use resources already present in your Kubernetes cluster. Specifically if there’s confusion between using defaults like nginx from ingress-controller or creating independent ones tailored for specific needs—like the one described below:

Error Encountered During Helm Installation

During installation with a custom helm chart, you might get an error that suggests it cannot continue because of existing resources. This happens when your YAML configuration conflicts with pre-installed components such as IngressClass nginx. The default namespace and release names are particularly problematic here:

Error: INSTALLATION FAILED: rendered manifests contain a resource (IngressClass "nginx") that already exists. Unable to continue with install due to conflicting metadata or annotations, for example mismatched Namespace/ReleaseName expectations (`default`/`acme-1681486075`) vs current state of `inventory`.

The error implies Helm is attempting to import a default Kubernetes resource which conflicts with the custom configuration. In this case, it wants you to rename your release or alter namespaces/annotations in order for installation not to fail due to these automatic assumptions about defaults and existing resources within cluster metadata annotations (meta.helm.sh).

Solution: Correcting Release Namespace Spelling Errors

After reviewing the chart’s configuration, a common source of such errors is incorrect spelling or case sensitivity issues in release names (for instance with lowercase instead of camelCase as recommended by Kubernetes standards). Here’s how you can resolve it without altering your Helm configurations drasticly:

dependencies:
  ...
- name: ingressNginx # Notice the CamelCased, not allLower or k8s specific 'Name' convention.  
    repository: https://kubernetes.github.io/ingress-nginx
    version: x.x.x     <!-- Replace with actual Ingress Nginx chart revision -->

By correcting your release name to camelCase, for example from FooBar (incorrect case) to foobar, you can avoid the namespace validation error that prevents Helm from proceeding further due to non-compliance of provided ReleaseName with Kubernetes standards. Once corrected:

dependencies:
  ...
name: ingressNginx # Corrected release name, now using camelCase convention which is valid in YAML and compatible with metadata expectations by Helm toolchain
    repository: https://kubernetes.github.io/ingress-nginx   <!-- Still referencing the official Ingress Nginx chart -->

After fixing this minor issue, use helm install again to deploy your application without conflicts regarding default assumptions of resources like ingress classes or namespaces. Remember that case sensitivity is significant when dealing with Kubernetes resource identifiers (as opposed to general programming languages). By respecting these conventions and resolving such subtle issues swiftly during chart development, you can streamline the Helm deployment process for your applications without manual intervention beyond what’s necessary in standard procedures.

This markdown summary ensures clarity while retaining all technical details from the original content provided by focusing on a resolution strategy to deploy customized Ingress using helm with minimal confusion over default configurations and release naming conventions within Kubernetes clusters.