129 lines
4.6 KiB
Markdown
129 lines
4.6 KiB
Markdown
# Kubernetes on vSphere with Terraform
|
|
|
|
Provision a Kubernetes cluster on [vSphere](https://www.vmware.com/products/vsphere.html) using Terraform and Kubespray.
|
|
|
|
## Overview
|
|
|
|
The setup looks like following.
|
|
|
|
```text
|
|
Kubernetes cluster
|
|
+-----------------------+
|
|
| +--------------+ |
|
|
| | +--------------+ |
|
|
| | | | |
|
|
| | | Master/etcd | |
|
|
| | | node(s) | |
|
|
| +-+ | |
|
|
| +--------------+ |
|
|
| ^ |
|
|
| | |
|
|
| v |
|
|
| +--------------+ |
|
|
| | +--------------+ |
|
|
| | | | |
|
|
| | | Worker | |
|
|
| | | node(s) | |
|
|
| +-+ | |
|
|
| +--------------+ |
|
|
+-----------------------+
|
|
```
|
|
|
|
## Warning
|
|
|
|
This setup assumes that the DHCP is disabled in the vSphere cluster and IP addresses have to be provided in the configuration file.
|
|
|
|
## Requirements
|
|
|
|
* Terraform 0.13.0 or newer (0.12 also works if you modify the provider block to include version and remove all `versions.tf` files)
|
|
|
|
## Quickstart
|
|
|
|
NOTE: *Assumes you are at the root of the kubespray repo*
|
|
|
|
Copy the sample inventory for your cluster and copy the default terraform variables.
|
|
|
|
```bash
|
|
CLUSTER=my-vsphere-cluster
|
|
cp -r inventory/sample inventory/$CLUSTER
|
|
cp contrib/terraform/vsphere/default.tfvars inventory/$CLUSTER/
|
|
cd inventory/$CLUSTER
|
|
```
|
|
|
|
Edit `default.tfvars` to match your setup. You MUST set values specific for you network and vSphere cluster.
|
|
|
|
```bash
|
|
# Ensure $EDITOR points to your favorite editor, e.g., vim, emacs, VS Code, etc.
|
|
$EDITOR default.tfvars
|
|
```
|
|
|
|
For authentication in your vSphere cluster you can use the environment variables.
|
|
|
|
```bash
|
|
export TF_VAR_vsphere_user=username
|
|
export TF_VAR_vsphere_password=password
|
|
```
|
|
|
|
Run Terraform to create the infrastructure.
|
|
|
|
```bash
|
|
terraform init ../../contrib/terraform/vsphere
|
|
terraform apply \
|
|
-var-file default.tfvars \
|
|
-state=tfstate-$CLUSTER.tfstate \
|
|
../../contrib/terraform/vsphere
|
|
```
|
|
|
|
You should now have a inventory file named `inventory.ini` that you can use with kubespray.
|
|
You can now copy your inventory file and use it with kubespray to set up a cluster.
|
|
You can type `terraform output` to find out the IP addresses of the nodes.
|
|
|
|
It is a good idea to check that you have basic SSH connectivity to the nodes. You can do that by:
|
|
|
|
```bash
|
|
ansible -i inventory.ini -m ping all
|
|
```
|
|
|
|
Example to use this with the default sample inventory:
|
|
|
|
```bash
|
|
ansible-playbook -i inventory.ini ../../cluster.yml -b -v
|
|
```
|
|
|
|
## Variables
|
|
|
|
### Required
|
|
|
|
* `machines`: Machines to provision. Key of this object will be used as the name of the machine
|
|
* `node_type`: The role of this node *(master|worker)*
|
|
* `ip`: The IP address of the machine
|
|
* `netmask`: The netmask to use (to be used on the right hand side in CIDR notation, e.g., `24`)
|
|
* `network`: The name of the network to attach the machines to
|
|
* `gateway`: The IP address of the network gateway
|
|
* `vsphere_datacenter`: The identifier of vSphere data center
|
|
* `vsphere_compute_cluster`: The identifier of vSphere compute cluster
|
|
* `vsphere_datastore`: The identifier of vSphere data store
|
|
* `vsphere_server`: This is the vCenter server name or address for vSphere API operations.
|
|
* `ssh_public_keys`: List of public SSH keys to install on all machines
|
|
* `template_name`: The name of a base image (the OVF template be defined in vSphere beforehand)
|
|
|
|
### Optional
|
|
|
|
* `folder`: Name of the folder to put all machines in (default: `""`)
|
|
* `prefix`: Prefix to use for all resources, required to be unique for all clusters in the same project (default: `"k8s"`)
|
|
* `inventory_file`: Name of the generated inventory file for Kubespray to use in the Ansible step (default: `inventory.ini`)
|
|
* `dns_primary`: The IP address of primary DNS server (default: `8.8.4.4`)
|
|
* `dns_secondary`: The IP address of secondary DNS server (default: `8.8.8.8`)
|
|
* `firmware`: Firmware to use (default: `bios`)
|
|
* `hardware_version`: The version of the hardware (default: `15`)
|
|
* `master_cores`: The number of CPU cores for the master nodes (default: 4)
|
|
* `master_memory`: The amount of RAM for the master nodes in MB (default: 4096)
|
|
* `master_disk_size`: The amount of disk space for the master nodes in GB (default: 20)
|
|
* `worker_cores`: The number of CPU cores for the worker nodes (default: 16)
|
|
* `worker_memory`: The amount of RAM for the worker nodes in MB (default: 8192)
|
|
* `worker_disk_size`: The amount of disk space for the worker nodes in GB (default: 100)
|
|
* `vapp`: Boolean to set the template type to vapp. (Default: false)
|
|
* `interface_name`: Name of the interface to configure. (Default: ens192)
|
|
|
|
An example variables file can be found `default.tfvars`
|