# Add/Delete worker-nodes

The TrilioVault Controller Cluster can be grown or shrunk at any time in its worker nodes if required.

When the master nodes need to be changed a redeployment is necessary.

## Add a worker-node

Run the following command on a master-node as root to get a Kubernetes token:

```
kubeadm token create --print-join-command
```

Run the following script using the output from the token create command.

```
yum install -y yum-utils
yum-config-manager \
    --add-repo \
    https://download.docker.com/linux/centos/docker-ce.repo
yum install docker-ce docker-ce-cli containerd.io
cat <<EOF > /etc/yum.repos.d/kubernetes.repo
[kubernetes]
name=Kubernetes
baseurl=https://packages.cloud.google.com/yum/repos/kubernetes-el7-x86_64
enabled=1
gpgcheck=1
repo_gpgcheck=1
gpgkey=https://packages.cloud.google.com/yum/doc/yum-key.gpg https://packages.cloud.google.com/yum/doc/rpm-package-key.gpg
EOF
#Install Kubernetes (kubeadm, kubelet and kubectl) 
dnf install -y kubeadm kubelet
systemctl start docker
systemctl enable docker

< Add output from above command >
```

{% hint style="info" %}
It is not required to do anything else as the TrilioVault Controller pods will automatically be deployed on any new node joining the Kubernetes cluster.
{% endhint %}

## Delete a worker-node

Run the following command to get a list of all nodes in the Kubernetes cluster.

```
kubectl get nodes
```

Delete the node using the node-name

```
kubectl delete node <nodename>
```


---

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