[Kubernetes (K8S)] Helm install MetalLB to handle ServiceType Loadbalancer for bare metal within Kubernetes (K8S)

Posted on 2020-09-19 Edited on 2024-09-12 In Cloud Native , Kubernetes (K8S) , Helm , Loadbalancer Views: Word count in article: 3.5k Reading time ≈ 3 mins.

MetalLB

MetalLB is an open source, rock solid LoadBalancer. It handles the ServiceType: Loadbalancer for bare metal Kubernetes clusters, using standard routing protocols.

This article is about how to use Pulumi, kubernetes (K8S) provider, Helm Chart and TypeScript SDK to deploy MetalLB within Kubernetes (K8S).

Prerequisites

Kubernetes (K8S)
Kubernetes (K8s) is an open-source system for automating deployment, scaling, and management of containerized applications.

For more information about installing and using Kubernetes (K8s), see the Kubernetes (K8s) Docs.
Helm
Helm is the best way to find, share, and use software built for Kubernetes.

For more information about installing and using Helm, see the Helm Docs.

Installation

Custom Values.yaml

Remember to replace the values within {{ }}.

# values.yaml

# charts/values.yaml at master · bitnami/charts
# https://github.com/bitnami/charts/blob/master/bitnami/metallb/values.yaml

## To configure MetalLB, you must specify ONE of the following two
## options.
#
## existingConfigMap specifies the name of an externally-defined
## ConfigMap to use as the configuration. Helm will not manage the
## contents of this ConfigMap, it is your responsibility to create it.
#
# existingConfigMap: metallb-config
#
## configInline specifies MetalLB's configuration directly, in yaml
## format. When configInline is used, Helm manages MetalLB's
## configuration ConfigMap as part of the release, and
## existingConfigMap is ignored.
## Refer to https://metallb.universe.tf/configuration/ for
## available options.
#
configInline: |
    # https://metallb.universe.tf/configuration/#layer-2-configuration
    address-pools:
    - name: default
      protocol: layer2
      addresses:
      # Replace with idle IP in the same subnet as the node IP.
      - {{ .Values.addresses }}

Install by Helm

Helm install metallb into metallb namespace.

# crate namespace:
$ kubectl create namespace metallb-system

# Add the Helm repository:
$ helm repo add bitnami https://charts.bitnami.com/bitnami

# Update your local Helm chart repository cache:
$ helm repo update

# To install Helm chart:
$ helm install metallb bitnami/metallb --namespace metallb-system -f values.yaml

See Helm release about metallb.

1
2
3

$ helm list --namespace metallb-system
NAME   	NAMESPACE     	REVISION	UPDATED                               	STATUS  	CHART         	APP VERSION
metallb	metallb-system	4       	2020-09-19 11:26:07.970123 +0800 +0800	deployed	metallb-0.1.24	0.9.3

See pods about metallb.

$ kubectl get pods -n metallb-system
NAME                                 READY   STATUS      RESTARTS   AGE
metallb-controller-f899f5594-7d29x   1/1     Running     6          15d
metallb-speaker-xkksl                1/1     Running     44         30d
metallb-speaker-xsqgx                1/1     Running     35         30d

Example

Create Deployment and Service(LoadBalancer) for Nginx.

# https://raw.githubusercontent.com/metallb/metallb/main/manifests/tutorial-2.yaml

apiVersion: apps/v1
kind: Deployment
metadata:
  name: nginx
spec:
  selector:
    matchLabels:
      app: nginx
  template:
    metadata:
      labels:
        app: nginx
    spec:
      containers:
      - name: nginx
        image: nginx:1
        ports:
        - name: http
          containerPort: 80

---
apiVersion: v1
kind: Service
metadata:
  name: nginx
spec:
  ports:
  - name: http
    port: 80
    protocol: TCP
    targetPort: 80
  selector:
    app: nginx
  type: LoadBalancer

Apply manifest file.

1	$ kubectl apply -f tutorial-2.yaml

Then, check svc or Service.

1
2
3

$ kubectl get svc
NAME         TYPE           CLUSTER-IP    EXTERNAL-IP    PORT(S)        AGE
nginx        LoadBalancer   10.105.4.74   <Your addresse>   80:32159/TCP   31d