# Pre-requisites
This document describes the pre-requisites to deploy Self-Hosted version of space.vars.product\_name.
Following table provides the recommended number of servers you should allocate to run your Self-Hosted space.vars.product\_name Instance.
### Management Cluster
As part of the installation process, the Self-Hosted version of space.vars.product\_name creates a **Kubernetes cluster** using the physical servers that you use to deploy it on. We refer to this cluster as the **management cluster**. The space.vars.product\_name management plane then runs as a set of Kubernetes pods and services on this management cluster.
Following is the recommended capacity for the management cluster, based on the projected scale of your space.vars.product\_name deployment.
| **Hypervisors You Plan to Use** | **Minimum Management Cluster Capacity** | **Recommended Management Cluster Capacity** |
| ------------------------------------- | ---------------------------------------------------------------------------------------------------------------------------------------------------- | -------------------------------------------------------------------------------------------------------------------------------------------------- |
| Small
(<20 hosts)
| 3 servers, each with:
12 vCPUs, 24GB RAM and 250GB SSD
| 4 servers, each with:
16 vCPUs, 32GB RAM and 500GB SSD
|
| Growth
(<100 hosts)
| 3 servers, each with:
16 vCPUs, 32GB RAM and 500GB SSD
| 5 servers, each with:
16 vCPUs, 32GB RAM and 1TB SSD
|
| Enterprise
(>100 hosts)
| 5 servers, each with:
16 vCPUs, 32GB RAM and 1TB SSD
1 additional server for every 100 workload servers or 10 workload clusters
| 6 servers, each with:
24 vCPUs, 32GB RAM and 1TB SSD
1 additional server for every 50 workload servers or 5 workload clusters
|
### Server Configuration
Each physical server that you use to run as part of the management cluster should meet following requirements:
**Operating System**: Ubuntu 22.04
**Swap config:**
* Make sure that each server has swap disabled. You can run the following command to do this.
{% tabs %}
{% tab title="Bash" %}
```bash
swapoff -a
```
{% endtab %}
{% endtabs %}
**IPv6 support:**
Ensure the below sysctl setting is set to 0, so that IPv6 support is enabled on the server.
{% tabs %}
{% tab title="Bash" %}
```bash
sysctl net.ipv6.conf.all.disable_ipv6
# If currently set to 1, change it to 0 as below:
echo net.ipv6.conf.all.disable_ipv6=0 >> /etc/sysctl.conf
sysctl -p
```
{% endtab %}
{% endtabs %}
**Passwordless Sudo:**
* Many operations require sudo access (for example, the installation of yum repos, docker etc.). Please ensure that your server has passwordless sudo enabled.
**Kernel Panic Option**
Update the server configuration section to include a step for setting `kernel.panic=10`
{% tabs %}
{% tab title="YAML" %}
```yaml
echo "kernel.panic=10" >> /etc/sysctl.conf && sysctl -p
```
{% endtab %}
{% endtabs %}
**SSH Keys:**
* We rely on ssh to login to the management cluster hosts, and to install various components and manage them.
* Please generate ssh keys and sync them across all hosts of the management cluster.
* We recommend generating the key pair on one host and then adding the public key to all other hosts in their `~/.ssh/authorized_keys` file. This will enable every host in the management cluster to ssh into every other host.
{% tabs %}
{% tab title="Bash" %}
```bash
cat ~/.ssh/id_rsa.pub >> ~/.ssh/authorized_keys
ssh-copy-id -i ~/.ssh/id_rsa.pub root@test-3
```
{% endtab %}
{% endtabs %}
**Package Updates:**
* Install `cgroup-tools` :
{% tabs %}
{% tab title="Bash" %}
```bash
apt-get update -y && apt-get install cgroup-tools -y
```
{% endtab %}
{% endtabs %}
* Download and Update OpenSSL Version to 3.0.7 for Ubuntu 22.04:
{% tabs %}
{% tab title="Bash" %}
```bash
curl --user-agent "" https://pf9-airctl.s3-accelerate.amazonaws.com/openssl-smcp-ubuntu/openssl_3.0.7-1_amd64.deb --output openssl_3.0.7-1_amd64.deb
sudo dpkg -i openssl_3.0.7-1_amd64.deb
cd /etc/ld.so.conf.d/
echo "/usr/local/ssl/lib64" > openssl-3.0.7.conf
ldconfig -v
sed -i 's/\(^PATH="[^"]*\)"/\1:\/usr\/local\/ssl\/bin"/' /etc/environment
source /etc/environment
ln -sf /usr/local/ssl/bin/openssl /usr/bin/openssl
cd
```
{% endtab %}
{% endtabs %}
* Verify OpenSSL Version
{% tabs %}
{% tab title="Bash" %}
```bash
openssl version
```
{% endtab %}
{% endtabs %}
**User Agent Key For Installation:**
You will need a specific Platform9 user agent key for installation of your self-hosted management plane. Your Platform9 sales engineer will share the key with you prior to the install.
### Networking
You will need 2 virtual IPs that are on the same L2 domain as the hosts in the management cluster.
* VIP #1: This is the IP where you can access the space.vars.product\_name management plane UI.
* VIP #2: This is used to serve the management Kubernetes cluster's API server.
### Storage
For a production setup of space.vars.self\_hosted\_product\_name, you will need a Kubernetes Container Strorage Interface (CSI) compatible storage for persisting the state of the management cluster. Read more about [CSI and Kubernetes Storage here](https://kubernetes.io/docs/concepts/storage/volumes/).
---
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