MetalLB

MetalLB is an open source, rock solid LoadBalancer. It handles the ServiceType: Loadbalancer.

TL;DR

$ helm repo add bitnami https://charts.bitnami.com/bitnami
$ helm install my-release bitnami/metallb

Introduction

Bitnami charts for Helm are carefully engineered, actively maintained and are the quickest and easiest way to deploy containers on a Kubernetes cluster that are ready to handle production workloads.

This chart bootstraps a MetalLB Controller Controller Deployment and a MetalLB Speaker Daemonset on a Kubernetes cluster using the Helm package manager.

Bitnami charts can be used with Kubeapps for deployment and management of Helm Charts in clusters. This Helm chart has been tested on top of Bitnami Kubernetes Production Runtime (BKPR). Deploy BKPR to get automated TLS certificates, logging and monitoring for your applications.

Prerequisites

• Kubernetes 1.12+
• Helm 2.12+ or Helm 3.0-beta3+
• Virtual IPs for Layer 2 or Route Reflector for BGP setup.

Installing the Chart

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

$ helm repo add bitnami https://charts.bitnami.com/bitnami
$ helm install my-release bitnami/metallb

These commands deploy metallb 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

Uninstalling the Chart

To uninstall/delete the my-release helm release:

$ helm uninstall my-release

The command removes all the Kubernetes components associated with the chart and deletes the release.

Parameters

The following tables lists the configurable parameters of the metallb chart and their default values.

Parameter	Description	Default
global.imageRegistry	Global Docker image registry	nil
global.imagePullSecrets	Global Docker registry secret names as an array	[] (does not add image pull secrets to deployed pods)
controller.image.registry	MetalLB Controller image registry	docker.io
controller.image.repository	MetalLB Controller image name	bitnami/metallb-controller
controller.image.tag	MetalLB Controller image tag	{TAG_NAME}
controller.image.pullPolicy	MetalLB Controller image pull policy	IfNotPresent
controller.image.pullSecrets	Specify docker-registry secret names as an array	[] (does not add image pull secrets to deployed pods)
controller.resources.limits	Specify resource limits which the container is not allowed to succeed.	{} (does not add resource limits to deployed pods)
controller.resources.requests	Specify resource requests which the container needs to spawn.	{} (does not add resource limits to deployed pods)
controller.nodeSelector	Node labels for controller pod assignment	{}
controller.tolerations	Tolerations for controller pod assignment	[]
controller.affinity	Affinity for controller pod assignment	{}
controller.podAnnotations	Controller Pod annotations	{}
controller.serviceAccount.create	create a serviceAccount for the controller pod	true
controller.serviceAccount.name	use the serviceAccount with the specified name	""
controller.revisionHistoryLimit	the revision history limit for the deployment.	3
controller.securityContext.enabled	Enable pods' security context	true
controller.securityContext.runAsNonRoot	MetalLB Controller must runs as nonRoot.	true
controller.securityContext.runAsUser	User ID for the pods.	1001
controller.securityContext.fsGroup	Group ID for the pods.	1001
controller.securityContext.allowPrivilegeEscalation	This defines if privilegeEscalation is allowed on that container	false
controller.securityContext.readOnlyRootFilesystem	This defines if the container can read the root fs on the host	true
controller.securityContext.capabilities.drop	Drop capabilities for the securityContext	["ALL"]
speaker.image.registry	MetalLB Speaker image registry	docker.io
speaker.image.repository	MetalLB Speaker image name	bitnami/metallb-speaker
speaker.image.tag	MetalLB Speaker image tag	{TAG_NAME}
speaker.image.pullPolicy	MetalLB Speaker image pull policy	IfNotPresent
speaker.image.pullSecrets	Specify docker-registry secret names as an array	[] (does not add image pull secrets to deployed pods)
speaker.resources.limits	Specify resource limits which the container is not allowed to succeed.	{} (does not add resource limits to deployed pods)
speaker.resources.requests	Specify resource requests which the container needs to spawn.	{} (does not add resource limits to deployed pods)
speaker.nodeSelector	Node labels for speaker pod assignment	{}
speaker.tolerations	Tolerations for speaker pod assignment	[]
speaker.affinity	Affinity for speaker pod assignment	{}
speaker.podAnnotations	Speaker Pod annotations	{}
speaker.serviceAccount.create	create a serviceAccount for the speaker pod	true
speaker.serviceAccount.name	use the serviceAccount with the specified name	""
speaker.daemonset.hostPorts.metrics	the tcp port to listen on for the openmetrics endpoint.	7472
speaker.daemonset.terminationGracePeriodSeconds	The terminationGracePeriod in seconds for the daemonset to stop	2
speaker.securityContext.enabled	Enable pods' security context	true
speaker.securityContext.runAsUser	User ID for the pods.	0
speaker.securityContext.allowPrivilegeEscalation	Enables privilege Escalation context for the pod.	false
speaker.securityContext.readOnlyRootFilesystem	Allows the pod to mount the RootFS as ReadOnly	true
speaker.securityContext.capabilities.drop	Drop capabilities for the securityContext	["ALL"]
speaker.securityContext.capabilities.add	Add capabilities for the securityContext	["NET_ADMIN", "NET_RAW", "SYS_ADMIN"]
speaker.secretName	References a Secret name for the member secret outside of the helm chart	nil
speaker.secretKey	References a Secret key for the member secret outside of the helm chart	nil
speaker.extraEnvVars	Extra environment variable to pass to the running container.	[]
nameOverride	String to partially override metallb.fullname template with a string (will prepend the release name)	nil
fullnameOverride	String to fully override metallb.fullname template with a string	nil
livenessProbe.enabled	Enable/disable the Liveness probe	true
livenessProbe.initialDelaySeconds	Delay before liveness probe is initiated	60
livenessProbe.periodSeconds	How often to perform the probe	10
livenessProbe.timeoutSeconds	When the probe times out	5
livenessProbe.successThreshold	Minimum consecutive successes for the probe to be considered successful after having failed.	1
livenessProbe.failureThreshold	Minimum consecutive failures for the probe to be considered failed after having succeeded.	6
existingConfigMap	Specify an existing configMapName to use. (this is mutually exclusive with the configInline option)	nil
configInline	Specify the config for metallb as a new configMap inline.	{} (does not create configMap)
rbac.create	Specify if an rbac authorization should be created with the necessarry Rolebindings.	true
prometheus.enabled	Enable for Prometheus alertmanager basic alerts.	false
prometheus.serviceMonitor.enabled	Specify if a servicemonitor will be deployed for prometheus-operator.	true
prometheus.serviceMonitor.jobLabel	Specify the jobLabel to use for the prometheus-operator	app.kubernetes.io/name"
prometheus.serviceMonitor.interval	Specify the scrape interval if not specified use defaul prometheus scrapeIntervall	""
prometheus.serviceMonitor.metricRelabelings	Specify additional relabeling of metrics.	[]
prometheus.serviceMonitor.relabelings	Specify general relabeling.	[]
prometheus.serviceMonitor.prometheusRule.enabled	Enable prometheus alertmanager basic alerts.	true

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

$ helm install my-release \
  --set livenessProbe.successThreshold=5 \
    bitnami/metallb

The above command sets the livenessProbe.successThreshold to 5.

Configuration and installation details

Rolling VS Immutable tags

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.

To configure MetalLB please look into the configuration section MetalLB Configuration.

Example Layer 2 configuration

configInline:
  # The address-pools section lists the IP addresses that MetalLB is
  # allowed to allocate, along with settings for how to advertise
  # those addresses over BGP once assigned. You can have as many
  # address pools as you want.
  address-pools:
  - # A name for the address pool. Services can request allocation
    # from a specific address pool using this name, by listing this
    # name under the 'metallb.universe.tf/address-pool' annotation.
    name: generic-cluster-pool
    # Protocol can be used to select how the announcement is done.
    # Supported values are bgp and layer2.
    protocol: layer2
    # A list of IP address ranges over which MetalLB has
    # authority. You can list multiple ranges in a single pool, they
    # will all share the same settings. Each range can be either a
    # CIDR prefix, or an explicit start-end range of IPs.
    addresses:
    - 10.27.50.30-10.27.50.35