# Manage Node Pools
## Create a node pool
{% hint style="info" %}
**Prerequisite:** Only contract owners, administrators, and users having **Create Kubernetes Clusters** permission can create node pools. Other user types have **read-only** access.
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{% tabs %}
{% tab title="Public Node Pools" %}
You can create a cluster using the **Kubernetes Manager** in [DCD](https://docs.ionos.com/support/general-information/glossary-of-terms#data-center-designer-dcd) for Public Node Pools.
1. In the **DCD**, go to **Containers** > **Managed Kubernetes**.
2. Select a cluster from the list and go to the **Node pools in Cluster** tab.
3. Select **+ Create node pool**.
4. In **Create Kubernetes node pool**, configure your node pools.
* In **Pool Settings**, provide the following information:
* **Pool Name**: Enter a name that aligns with the Kubernetes naming convention.
* **Data Center**: Select an option from the drop-down list. Your node pool will be included in the selected data center. If you do not have a data center, you must first create one.
* **Node pool version**: Select an appropriate version from the drop-down list.
* **Node count**: Select the number of nodes in the node count.
* **Autoscale**: Select the checkbox to enable autoscale and provide a minimum and maximum number of the total nodes.
* **Attached private LANs**: Select **+** and choose a private LAN from the drop-down list.
* **Reserved IPs**: Select **+** and choose a reserved IP address from the drop-down list.
* In the **Node Pool Template**, provide the following information:
* **CPU**: Select an option from the drop-down list.
* **Cores**: Select the number of cores.
* **RAM**: Select the size of your RAM.
* **Availability Zone**: Select a zone from the drop-down list.
* **Storage Type**: Select a type of storage from the drop-down list.
* **Storage Size**: Select the storage size for your storage.
{% hint style="info" %}
**Note:**\
Make sure to use the following naming convention for the Kubernetes cluster:
* Can be a maximum of 63 characters in length.
* Begins and ends with an alphanumeric character (\[a-z0-9A-Z]).
* Must not contain spaces or any other white-space characters.
* Can contain dashes (-), underscores (\_), and dots (.) in between.
{% endhint %}
5. Select **Create node pool**.
{% hint style="success" %}
**Result:** A node pool is successfully created and can be used once it reaches the **active state**.
{% endhint %}
### Rebuild a node
When a node fails or becomes unresponsive you can rebuild that node. This will create a new node with an identical configuration that will replace the failed node.
{% hint style="info" %}
**Prerequisite:** Make sure your node is **active**.
{% endhint %}
1. Select a cluster from the list and go to the **Node pools in Cluster** tab.
2. Select the node pool that contains the **failed node**.
3. Select **Rebuild**.
4. Confirm your selection by selecting **OK**.
{% hint style="success" %}
**Result:**
* **Managed Kubernetes** starts a process that is based on the **Node Template**. The template creates and configures a new node. Once the status is updated to **ACTIVE**, then it migrates all the pods from the faulty node to the new node.
* The faulty node is deleted once it is empty.
* While this operation occurs, the node pool will have an extra billable active node.
* The node pool is successfully rebuilt.
{% endhint %}
{% endtab %}
{% tab title="Private Node Pools" %}
You can create a cluster using the **Kubernetes Manager** in [DCD](https://docs.ionos.com/support/general-information/glossary-of-terms#data-center-designer-dcd) for Private Node Pools.
1. In the **DCD**, go to **Containers** > **Managed Kubernetes**.
2. Select a cluster from the list and go to the **Node pools in Cluster** tab.
3. Select **+ Create node pool**.
4. In **Create Kubernetes node pool**, configure your node pools.
* In **Pool Settings**, provide the following information:
* **Pool Name**: Enter a name that aligns with the Kubernetes naming convention.
* **Data Center**: Select an option from the drop-down list. Your node pool will be included in the selected data center. If you do not have a data center, you must first create one.
* **Node pool version**: Select an appropriate version from the drop-down list.
* **Node count**: Select the number of nodes in the node count.
* **Autoscale**: Select the checkbox to enable autoscale and provide a minimum and maximum number of the total nodes.
* **Attached private LANs**: Select **+** and choose a private LAN from the drop-down list.
* **Reserved IPs**: Select **+** and choose a reserved IP address from the drop-down list.
* In the **Node Pool Template**, provide the following information:
* **CPU**: Select an option from the drop-down list.
* **Cores**: Select the number of cores.
* **RAM**: Select the size of your RAM.
* **Availability Zone**: Select a zone from the drop-down list.
* **Storage Type**: Select a type of storage from the drop-down list.
* **Storage Size**: Select the storage size for your storage.
{% hint style="info" %}
**Note:**\
Make sure to use the following naming convention for the Kubernetes cluster:
* Can be a maximum of 63 characters in length.
* Begins and ends with an alphanumeric character (\[a-z0-9A-Z]).
* Must not contain spaces or any other white-space characters.
* Can contain dashes (-), underscores (\_), and dots (.) in between.
{% endhint %}
5. Select **Create node pool**.
{% hint style="success" %}
**Result:** A node pool is successfully created and can be used once it reaches the **Active** state.
{% endhint %}
### Rebuild a node
When a node fails or becomes unresponsive, you can rebuild that node. This will create a new node with an identical configuration that will replace the failed node.
{% hint style="info" %}
**Prerequisite:** Make sure your node is **active**.
{% endhint %}
1. Select a cluster from the list and go to the **Node pools in Cluster** tab.
2. Select the node pool that contains the **failed node**.
3. Select **Rebuild**.
4. Confirm your selection by selecting **OK**.
{% hint style="success" %}
**Result:**
* **Managed Kubernetes** starts a process that is based on the **Node Template**. The template creates and configures a new node. Once the status is updated to **ACTIVE**, then it migrates all the pods from the faulty node to the new node.
* The faulty node is deleted once it is empty.
* While this operation occurs, the node pool will have an extra billable active node.
* The node pool is successfully rebuilt.
{% endhint %}
{% endtab %}
{% endtabs %}
{% hint style="info" %}
Avoid accessing the target data center while Managed Kubernetes is provisioning nodes, as concurrent manual interaction can cause undesirable results.
{% endhint %}