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Kubernetes on NIFCLOUD with Terraform

Provision a Kubernetes cluster on NIFCLOUD using Terraform and Kubespray

Overview

The setup looks like following

                              Kubernetes cluster
                        +----------------------------+
+---------------+       |   +--------------------+   |
|               |       |   | +--------------------+ |
| API server LB +---------> | |                    | |
|               |       |   | | Control Plane/etcd | |
+---------------+       |   | | node(s)            | |
                        |   +-+                    | |
                        |     +--------------------+ |
                        |           ^                |
                        |           |                |
                        |           v                |
                        |   +--------------------+   |
                        |   | +--------------------+ |
                        |   | |                    | |
                        |   | |        Worker      | |
                        |   | |        node(s)     | |
                        |   +-+                    | |
                        |     +--------------------+ |
                        +----------------------------+

Requirements

Terraform 1.3.7

Quickstart

Export Variables

Your NIFCLOUD credentials:

export NIFCLOUD_ACCESS_KEY_ID=<YOUR ACCESS KEY>
export NIFCLOUD_SECRET_ACCESS_KEY=<YOUR SECRET ACCESS KEY>

The SSH KEY used to connect to the instance:
- FYI: Cloud Help(SSH Key)
```
export TF_VAR_SSHKEY_NAME=<YOUR SSHKEY NAME>
```

The IP address to connect to bastion server:

export TF_VAR_working_instance_ip=$(curl ifconfig.me)

Create The Infrastructure

Run terraform:

terraform init
terraform apply -var-file ./sample-inventory/cluster.tfvars

Setup The Kubernetes

Generate cluster configuration file:

./generate-inventory.sh > sample-inventory/inventory.ini

Export Variables:

BASTION_IP=$(terraform output -json | jq -r '.kubernetes_cluster.value.bastion_info | to_entries[].value.public_ip')
API_LB_IP=$(terraform output -json | jq -r '.kubernetes_cluster.value.control_plane_lb')
CP01_IP=$(terraform output -json | jq -r '.kubernetes_cluster.value.control_plane_info | to_entries[0].value.private_ip')
export ANSIBLE_SSH_ARGS="-o StrictHostKeyChecking=no -o UserKnownHostsFile=/dev/null -o ProxyCommand=\"ssh root@${BASTION_IP} -W %h:%p\""

Set ssh-agent"

eval `ssh-agent`
ssh-add <THE PATH TO YOUR SSH KEY>

Run cluster.yml playbook:

cd ./../../../
ansible-playbook -i contrib/terraform/nifcloud/inventory/inventory.ini cluster.yml

Connecting to Kubernetes

Install kubectl on the localhost

Fetching kubeconfig file:

mkdir -p ~/.kube
scp -o ProxyCommand="ssh root@${BASTION_IP} -W %h:%p" root@${CP01_IP}:/etc/kubernetes/admin.conf ~/.kube/config

Rewrite /etc/hosts

sudo echo "${API_LB_IP} lb-apiserver.kubernetes.local" >> /etc/hosts

Run kubectl
```
kubectl get node
```

Variables

region: Region where to run the cluster
az: Availability zone where to run the cluster
private_ip_bn: Private ip address of bastion server
private_network_cidr: Subnet of private network
instances_cp: Machine to provision as Control Plane. Key of this object will be used as part of the machine' name
- private_ip: private ip address of machine
instances_wk: Machine to provision as Worker Node. Key of this object will be used as part of the machine' name
- private_ip: private ip address of machine
instance_key_name: The key name of the Key Pair to use for the instance
instance_type_bn: The instance type of bastion server
instance_type_wk: The instance type of worker node
instance_type_cp: The instance type of control plane
image_name: OS image used for the instance
working_instance_ip: The IP address to connect to bastion server
accounting_type: Accounting type. (1: monthly, 2: pay per use)

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