bitnamicharts/cadvisor

Bitnami Secure Images Helm chart for cAdvisor

cAdvisor (Container Advisor) is an open-source tool by Google for monitoring containers, collecting metrics like CPU, memory, and network usage.

https://github.com/google/cadvisor

Trademarks: This software listing is packaged by Bitnami. The respective trademarks mentioned in the offering are owned by the respective companies, and use of them does not imply any affiliation or endorsement.

TL;DR

console
helm install my-release oci://REGISTRY_NAME/REPOSITORY_NAME/cadvisor

Note: You need to substitute the placeholders REGISTRY_NAME and REPOSITORY_NAME with a reference to your Helm chart registry and repository.

Introduction

This chart bootstraps a https://github.com/bitnami/containers/tree/main/bitnami/cadvisor deployment on a https://kubernetes.io cluster using the https://helm.sh package manager.

Before you begin

• Kubernetes 1.23+
• Helm 3.8.0+

Installing the Chart

To install the chart with the release name my-release:

console
helm install my-release oci://REGISTRY_NAME/REPOSITORY_NAME/cadvisor

Note: You need to substitute the placeholders REGISTRY_NAME and REPOSITORY_NAME with a reference to your Helm chart registry and repository. For example, in the case of Bitnami, you need to use REGISTRY_NAME=registry-1.docker.io and REPOSITORY_NAME=bitnamicharts.

The command deploys cAdvisor on the Kubernetes cluster in the default configuration. The Parameters section lists the parameters that can be configured during installation.

Tip: List all releases using helm list

Configuration and installation details

This section describes credentials, configuration, and other installation options.

Resource requests and limits

Bitnami charts allow setting resource requests and limits for all containers inside the chart deployment. These are inside the resources value (check parameter table). Setting requests is essential for production workloads and these should be adapted to your specific use case.

To make this process easier, the chart contains the resourcesPreset values, which automatically sets the resources section according to different presets. Check these presets in https://github.com/bitnami/charts/blob/main/bitnami/common/templates/_resources.tpl#L15. However, in production workloads using resourcesPreset is discouraged as it may not fully adapt to your specific needs. Find more information on container resource management in the https://kubernetes.io/docs/concepts/configuration/manage-resources-containers/.

https://techdocs.broadcom.com/us/en/vmware-tanzu/bitnami-secure-images/bitnami-secure-images/services/bsi-doc/apps-tutorials-understand-rolling-tags-containers-index.html

It is strongly recommended to use immutable tags in a production environment. This ensures your deployment does not change automatically if the same tag is updated with a different image.

Bitnami will release a new chart updating its containers if a new version of the main container, significant changes, or critical vulnerabilities exist.

Image

The image parameter allows specifying which image will be pulled for the chart.

Private registry

If you configure the image value to one in a private registry, you will need to https://kubernetes.io/docs/concepts/containers/images/#specifying-imagepullsecrets-on-a-pod.

1. Manually create image pull secret(s) in the namespace. See https://kubernetes.io/docs/concepts/containers/images/#creating-a-secret-with-a-docker-config. Consult your image registry's documentation about getting the appropriate secret.

2. Note that the imagePullSecrets configuration value cannot currently be passed to helm using the --set parameter, so you must supply these using a values.yaml file, such as:

   yaml
   imagePullSecrets:
     - name: SECRET_NAME
   

3. Install the chart

Setting Pod's affinity

This chart allows you to set your custom affinity using the affinity parameter. Find more information about Pod's affinity in the https://kubernetes.io/docs/concepts/configuration/assign-pod-node/#affinity-and-anti-affinity.

As an alternative, you can use of the preset configurations for pod affinity, pod anti-affinity, and node affinity available at the https://github.com/bitnami/charts/tree/main/bitnami/common#affinities chart. To do so, set the podAffinityPreset, podAntiAffinityPreset, or nodeAffinityPreset parameters.

Prometheus metrics

This chart can be integrated with Prometheus by setting metrics.enabled to true. This will expose cAdvisor native Prometheus endpoint in the service. It will have the necessary annotations to be automatically scraped by Prometheus.

Prometheus requirements

It is necessary to have a working installation of Prometheus or Prometheus Operator for the integration to work. Install the https://github.com/bitnami/charts/tree/main/bitnami/prometheus or the https://github.com/bitnami/charts/tree/main/bitnami/kube-prometheus to easily have a working Prometheus in your cluster.

Integration with Prometheus Operator

The chart can deploy ServiceMonitor objects for integration with Prometheus Operator installations. To do so, set the value metrics.serviceMonitor.enabled=true. Ensure that the Prometheus Operator CustomResourceDefinitions are installed in the cluster or it will fail with the following error:

text
no matches for kind "ServiceMonitor" in version "monitoring.coreos.com/v1"

Install the https://github.com/bitnami/charts/tree/main/bitnami/kube-prometheus for having the necessary CRDs and the Prometheus Operator.

Extra cAdvisor parameters

It is possible to add extra configuration parameters to the cadvisor command using the extraArgs value. In the following example we use add the extra log_cadvisor_usage=true argument:

yaml
extraArgs:
  - -log_cadvisor_usage=true

Check the https://github.com/google/cadvisor/blob/master/docs/runtime_options.md#L1 for the list of available arguments.

Hostpath mounts

The Bitnami cAdvisor chart mounts a set of host folders by default, which can be enabled/disabled with the following values inside the the defaultMounts section:

• defaultMounts.rootfs: Mount the host / folder
• defaultMounts.varRun: Mount the host /var/run folder
• defaultMounts.sys: Mount the host /sys folder
• defaultMounts.varLibDocker: Mount the host /var/lib/docker folder
• defaultMounts.devDisk: Mount the host /dev/disk folder

You can mount extra folders using the extraVolumes and extraVolumeMounts values.

Gateway API

This chart provides support for exposing cAdvisor using the https://gateway-api.sigs.k8s.io/ and its HTTPRoute resource. If you have a Gateway controller installed on your cluster, such as APISIX, Contour, Envoy Gateway, NGINX Gateway Fabric or Kong Ingress Controller you can utilize the Gateway controller to serve your application. To enable Gateway API integration, set httpRoute.enabled to true. The Gateway to be used can be customized by setting the httpRoute.parentRefs parameter. By default, it will reference a Gateway named gateway in the same namespace as the release.

You can specify the list of hostnames to be mapped to the deployment using the httpRoute.hostnames parameter. Additionally, you can customize the rules used to route the traffic to the service by modifying the httpRoute.matches and httpRoute.filters parameters or adding new rules using the httpRoute.extraRules parameter.

Ingress

This chart provides support for Ingress resources. If you have an ingress controller installed on your cluster, such as https://github.com/bitnami/charts/tree/main/bitnami/nginx-ingress-controller or https://github.com/bitnami/charts/tree/main/bitnami/contour you can utilize the ingress controller to serve your application. To enable Ingress integration, set ingress.enabled to true.

The most common scenario is to have one host name mapped to the deployment. In this case, the ingress.hostname property can be used to set the host name. The ingress.tls parameter can be used to add the TLS configuration for this host.

However, it is also possible to have more than one host. To facilitate this, the ingress.extraHosts parameter (if available) can be set with the host names specified as an array. The ingress.extraTLS parameter (if available) can also be used to add the TLS configuration for extra hosts.

NOTE: For each host specified in the ingress.extraHosts parameter, it is necessary to set a name, path, and any annotations that the Ingress controller should know about. Not all annotations are supported by all Ingress controllers, but https://github.com/kubernetes/ingress-nginx/blob/master/docs/user-guide/nginx-configuration/annotations.md lists the annotations supported by many popular Ingress controllers.

Adding the TLS parameter (where available) will cause the chart to generate HTTPS URLs, and the application will be available on port 443. The actual TLS secrets do not have to be generated by this chart. However, if TLS is enabled, the Ingress record will not work until the TLS secret exists.

https://kubernetes.io/docs/concepts/services-networking/ingress-controllers/.

Configure TLS Secrets for use with Ingress

This chart facilitates the creation of TLS secrets for use with the Ingress controller (although this is not mandatory). There are several common use cases:

• Generate certificate secrets based on chart parameters.
• Enable externally generated certificates.
• Manage application certificates via an external service (like https://github.com/jetstack/cert-manager/).
• Create self-signed certificates within the chart (if supported).

In the first two cases, a certificate and a key are needed. Files are expected in .pem format.

Here is an example of a certificate file:

NOTE: There may be more than one certificate if there is a certificate chain.

text
-----BEGIN CERTIFICATE-----
MIID6TCCAtGgAwIBAgIJAIaCwivkeB5EMA0GCSqGSIb3DQEBCwUAMFYxCzAJBgNV
...
jScrvkiBO65F46KioCL9h5tDvomdU1aqpI/CBzhvZn1c0ZTf87tGQR8NK7v7
-----END CERTIFICATE-----

Here is an example of a certificate key:

text
-----BEGIN RSA PRIVATE KEY-----
MIIEogIBAAKCAQEAvLYcyu8f3skuRyUgeeNpeDvYBCDcgq+LsWap6zbX5f8oLqp4
...
wrj2wDbCDCFmfqnSJ+dKI3vFLlEz44sAV8jX/kd4Y6ZTQhlLbYc=
-----END RSA PRIVATE KEY-----

• If using Helm to manage the certificates based on the parameters, copy these values into the certificate and key values for a given *.ingress.secrets entry.
• If managing TLS secrets separately, it is necessary to create 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).
• If your cluster has a https://github.com/jetstack/cert-manager add-on to automate the management and issuance of TLS certificates, add to *.ingress.annotations the https://cert-manager.io/docs/usage/ingress/#supported-annotations for cert-manager.
• If using self-signed certificates created by Helm, set both *.ingress.tls and *.ingress.selfSigned to true.

FIPS parameters

The FIPS parameters only have effect if you are using images from the https://go-vmware.broadcom.com/contact-us.

For more information on this new support, please refer to the https://techdocs.broadcom.com/us/en/vmware-tanzu/bitnami-secure-images/bitnami-secure-images/services/bsi-doc/security-frameworks-FIPS-compliance.html.

Parameters

The following subsections list global, common, and component-specific parameters.

Global parameters

Common parameters

cAdvisor parameters

Note: the README for this chart is longer than the DockerHub length limit of 25000, so it has been trimmed. The full README can be found at https://techdocs.broadcom.com/us/en/vmware-tanzu/bitnami-secure-images/bitnami-secure-images/services/bsi-app-doc/apps-charts-cadvisor-index.html