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Update MetalLB README.md (#6350)

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Recently MetalLB becomes one of addons with renaming the options.
This updates MetalLB README.md for this change.
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Kenichi Omichi 2020-07-02 07:12:54 -07:00 committed by GitHub
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roles/kubernetes-apps/metallb/README.md
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MetalLB hooks into your Kubernetes cluster, and provides a network load-balancer implementation. MetalLB hooks into your Kubernetes cluster, and provides a network load-balancer implementation.
In short, it allows you to create Kubernetes services of type "LoadBalancer" in clusters that In short, it allows you to create Kubernetes services of type "LoadBalancer" in clusters that
don't run on a cloud provider, and thus cannot simply hook into paid products to provide load-balancers. don't run on a cloud provider, and thus cannot simply hook into paid products to provide load-balancers.
This playbook aims to automate [this](https://metallb.universe.tf/concepts/layer2/). This addon aims to automate [this](https://metallb.universe.tf/concepts/layer2/).
It deploys MetalLB into Kubernetes and sets up a layer 2 load-balancer. It deploys MetalLB into Kubernetes and sets up a layer 2 load-balancer.
## Install ## Install
Defaults can be found in contrib/metallb/roles/provision/defaults/main.yml. In the default, MetalLB is not deployed into your Kubernetes cluster.
You can override the defaults by copying the contents of this file to somewhere in inventory/mycluster/group_vars You can override the defaults by copying the contents of this file to somewhere in inventory/mycluster/group_vars
such as inventory/mycluster/groups_vars/k8s-cluster/addons.yml and making any adjustments as required. such as inventory/mycluster/groups_vars/k8s-cluster/addons.yml and updating metallb_enabled option to `true`.
MetalLB allocates external IP addresses from this ip_range option, so you need to update this ip_range option In addition you need to update metallb_ip_range option on the addons.yml at least for suiting your network
at least for suiting your network environment. environment, because MetalLB allocates external IP addresses from this metallb_ip_range option.
```
ansible-playbook --ask-become -i inventory/sample/hosts.ini contrib/metallb/metallb.yml
```