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Kubeapps

CircleCI

Kubeapps is a web-based UI for deploying and managing applications in Kubernetes clusters. Kubeapps allows you to:

TL;DR

helm repo add bitnami https://charts.bitnami.com/bitnami
kubectl create namespace kubeapps
helm install kubeapps --namespace kubeapps bitnami/kubeapps

Introduction

This chart bootstraps a Kubeapps deployment on a Kubernetes cluster using the Helm package manager.

It also packages the Bitnami PostgreSQL chart which is required for bootstrapping a deployment for the database requirements of the Kubeapps application.

Prerequisites

  • Kubernetes 1.15+ (tested with Azure Kubernetes Service, Google Kubernetes Engine, minikube and Docker for Desktop Kubernetes)
  • Helm 3.0.2+
  • Administrative access to the cluster to create Custom Resource Definitions (CRDs)

Installing the Chart

To install the chart with the release name kubeapps:

helm repo add bitnami https://charts.bitnami.com/bitnami
kubectl create namespace kubeapps
helm install kubeapps --namespace kubeapps bitnami/kubeapps

The command deploys Kubeapps on the Kubernetes cluster in the kubeapps namespace. The Parameters section lists the parameters that can be configured during installation.

Caveat: Only one Kubeapps installation is supported per namespace

Once you have installed Kubeapps follow the Getting Started Guide for additional information on how to access and use Kubeapps.

Parameters

For a full list of configuration parameters of the Kubeapps chart, see the values.yaml file.

Specify each parameter using the --set key=value[,key=value] argument to helm install. For example,

helm install kubeapps --namespace kubeapps \
  --set assetsvc.service.port=9090 \
    bitnami/kubeapps

The above command sets the port for the assetsvc Service to 9090.

Alternatively, a YAML file that specifies the values for parameters can be provided while installing the chart. For example,

helm install kubeapps --namespace kubeapps -f custom-values.yaml bitnami/kubeapps

Configuration and installation details

Configuring Initial Repositories

By default, Kubeapps will track the community Helm charts and the Kubernetes Service Catalog charts. To change these defaults, override with your desired parameters the apprepository.initialRepos object present in the values.yaml file.

Enabling Operators

Since v1.9.0 (and by default since v2.0), Kubeapps supports to deploy and manage Operators within its dashboard. More information about how to enable and use this feature can be found in this guide.

Exposing Externally

Note: The Kubeapps frontend sets up a proxy to the Kubernetes API service which means that when exposing the Kubeapps service to a network external to the Kubernetes cluster (perhaps on an internal or public network), the Kubernetes API will also be exposed for authenticated requests from that network. It is highly recommended that you use an OAuth2/OIDC provider with Kubeapps to ensure that your authentication proxy is exposed rather than the Kubeapps frontend. This ensures that only the configured users trusted by your Identity Provider will be able to reach the Kubeapps frontend and therefore the Kubernetes API. Kubernetes service token authentication should only be used for users for demonstration purposes only, not production environments.

LoadBalancer Service

The simplest way to expose the Kubeapps Dashboard is to assign a LoadBalancer type to the Kubeapps frontend Service. For example, you can use the following parameter: frontend.service.type=LoadBalancer

Wait for your cluster to assign a LoadBalancer IP or Hostname to the kubeapps Service and access it on that address:

kubectl get services --namespace kubeapps --watch

Ingress

This chart provides support for ingress resources. If you have an ingress controller installed on your cluster, such as nginx-ingress or traefik you can utilize the ingress controller to expose Kubeapps.

To enable ingress integration, please set ingress.enabled to true

Hosts

Most likely you will only want to have one hostname that maps to this Kubeapps installation (use the ingress.hostname parameter to set the hostname), however, it is possible to have more than one host. To facilitate this, the ingress.extraHosts object is an array.

Annotations

For annotations, please see this document. Not all annotations are supported by all ingress controllers, but this document does a good job of indicating which annotation is supported by many popular ingress controllers. Annotations can be set using ingress.annotations.

TLS

To enable TLS, please set ingress.tls to true. When enabling this parameter, the TLS certificates will be retrieved from a TLS secret with name INGRESS_HOSTNAME-tls (where INGRESS_HOSTNAME is a placeholder to be replaced with the hostname you set using the ingress.hostname parameter).

You can use the ingress.extraTls to provide the TLS configuration for the extra hosts you set using the ingress.extraHosts array. Please see this example for more information.

You can provide your own certificates using the ingress.secrets object. If your cluster has a cert-manager add-on to automate the management and issuance of TLS certificates, set ingress.certManager boolean to true to enable the corresponding annotations for cert-manager. For a full list of configuration parameters related to configuring TLS can see the values.yaml file.

Upgrading Kubeapps

You can upgrade Kubeapps from the Kubeapps web interface. Select the namespace in which Kubeapps is installed (kubeapps if you followed the instructions in this guide) and click on the "Upgrade" button. Select the new version and confirm.

You can also use the Helm CLI to upgrade Kubeapps, first ensure you have updated your local chart repository cache:

helm repo update

Now upgrade Kubeapps:

export RELEASE_NAME=kubeapps
helm upgrade $RELEASE_NAME bitnami/kubeapps

If you find issues upgrading Kubeapps, check the troubleshooting section.

Uninstalling the Chart

To uninstall/delete the kubeapps deployment:

helm uninstall -n kubeapps kubeapps

# Optional: Only if there are no more instances of Kubeapps
kubectl delete crd apprepositories.kubeapps.com

The first command removes most of the Kubernetes components associated with the chart and deletes the release. After that, if there are no more instances of Kubeapps in the cluster you can manually delete the apprepositories.kubeapps.com CRD used by Kubeapps that is shared for the entire cluster.

NOTE: If you delete the CRD for apprepositories.kubeapps.com it will delete the repositories for all the installed instances of kubeapps. This will break existing installations of kubeapps if they exist.

If you have dedicated a namespace only for Kubeapps you can completely clean remaining completed/failed jobs or any stale resources by deleting the namespace

kubectl delete namespace kubeapps

Troubleshooting

Nginx Ipv6 error

When starting the application with the --set enableIPv6=true option, the Nginx server present in the services kubeapps and kubeapps-internal-dashboard may fail with the following:

nginx: [emerg] socket() [::]:8080 failed (97: Address family not supported by protocol)

This usually means that your cluster is not compatible with IPv6. To disable it, install kubeapps with the flag: --set enableIPv6=false.

Forbidden error while installing the Chart

If during installation you run into an error similar to:

Error: release kubeapps failed: clusterroles.rbac.authorization.k8s.io "kubeapps-apprepository-controller" is forbidden: attempt to grant extra privileges: [{[get] [batch] [cronjobs] [] []...

Or:

Error: namespaces "kubeapps" is forbidden: User "system:serviceaccount:kube-system:default" cannot get namespaces in the namespace "kubeapps"

It is possible, though uncommon, that your cluster does not have Role Based Access Control (RBAC) enabled. To check if your cluster has RBAC you can execute:

kubectl api-versions

If the above command does not include entries for rbac.authorization.k8s.io you should perform the chart installation by setting rbac.create=false:

helm install --name kubeapps --namespace kubeapps bitnami/kubeapps --set rbac.create=false

Error while upgrading the Chart

It is possible that when upgrading Kubeapps an error appears. That can be caused by a breaking change in the new chart or because the current chart installation is in an inconsistent state. If you find issues upgrading Kubeapps you can follow these steps:

Note: This steps assume that you have installed Kubeapps in the namespace kubeapps using the name kubeapps. If that is not the case replace the command with your namespace and/or name.

Note: If you are upgrading from 1.X to 2.X see the following section.

  1. (Optional) Backup your personal repositories (if you have any):
kubectl get apprepository -A -o yaml > <repo name>.yaml
  1. Delete Kubeapps:
helm del --purge kubeapps
  1. (Optional) Delete the App Repositories CRD:

Warning: Don't execute this step if you have more than one Kubeapps installation in your cluster.

kubectl delete crd apprepositories.kubeapps.com
  1. (Optional) Clean the Kubeapps namespace:

Warning: Don't execute this step if you have workloads other than Kubeapps in the kubeapps namespace.

kubectl delete namespace kubeapps
  1. Install the latest version of Kubeapps (using any custom modifications you need):
helm repo update
helm install --name kubeapps --namespace kubeapps bitnami/kubeapps
  1. (Optional) Restore any repositories you backed up in the first step:
kubectl apply -f <repo name>.yaml

After that you should be able to access the new version of Kubeapps. If the above doesn't work for you or you run into any other issues please open an issue.

Upgrading to 2.0

Kubeapps 2.0 (Chart version 4.0.0) introduces some breaking changes:

  • Helm 2 is no longer supported. If you are still using some Helm 2 charts, migrate them with the available tools. Note that some charts (but not all of them) may require to be migrated to the new Chart specification (v2). If you are facing any issue managing this migration and Kubeapps, please open a new issue!
  • MongoDB is not longer supported. Since 2.0, the only database supported is PostgreSQL.
  • PosgreSQL chart dependency has been upgraded to a new major version.

Due to the last point, it's necessary to run a command before upgrading to Kubeapps 2.0:

Note: The command below assumes that Kubeapps has been deployed in the kubeapps namespace using "kubeapps" as release name, if that's not the case, adapt the command accordingly.

kubectl delete statefulset -n kubeapps kubeapps-postgresql-master kubeapps-postgresql-slave

After that you should be able to upgrade Kubeapps as always and the database will be repopulated.

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