71 lines
2.7 KiB
Markdown
71 lines
2.7 KiB
Markdown
## Kubernetes on AWS with Terraform
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**Overview:**
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This project will create:
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* VPC with Public and Private Subnets in # Availability Zones
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* Bastion Hosts and NAT Gateways in the Public Subnet
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* A dynamic number of masters, etcd, and worker nodes in the Private Subnet
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* even distributed over the # of Availability Zones
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* AWS ELB in the Public Subnet for accessing the Kubernetes API from the internet
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**Requirements**
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- Terraform 0.8.7 or newer
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**How to Use:**
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- Export the variables for your AWS credentials or edit `credentials.tfvars`:
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```
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export AWS_ACCESS_KEY_ID="www"
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export AWS_SECRET_ACCESS_KEY ="xxx"
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export AWS_SSH_KEY_NAME="yyy"
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export AWS_DEFAULT_REGION="zzz"
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```
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- Rename `contrib/terraform/aws/terraform.tfvars.example` to `terraform.tfvars`
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- Update `contrib/terraform/aws/terraform.tfvars` with your data
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- Allocate a new AWS Elastic IP. Use this for your `loadbalancer_apiserver_address` value (below)
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- Create an AWS EC2 SSH Key
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- Run with `terraform apply --var-file="credentials.tfvars"` or `terraform apply` depending if you exported your AWS credentials
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Example:
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```commandline
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terraform apply -var-file=credentials.tfvars -var 'loadbalancer_apiserver_address=34.212.228.77'
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```
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- Terraform automatically creates an Ansible Inventory file called `hosts` with the created infrastructure in the directory `inventory`
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- Ansible will automatically generate an ssh config file for your bastion hosts. To make use of it, make sure you have a line in your `ansible.cfg` file that looks like the following:
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```commandline
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ssh_args = -F ./ssh-bastion.conf -o ControlMaster=auto -o ControlPersist=30m
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```
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- Once the infrastructure is created, you can run the kubespray playbooks and supply inventory/hosts with the `-i` flag.
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Example (this one assumes you are using CoreOS)
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```commandline
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ansible-playbook -i ./inventory/hosts ./cluster.yml -e ansible_ssh_user=core -e bootstrap_os=coreos -b --become-user=root --flush-cache
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```
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**Troubleshooting**
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***Remaining AWS IAM Instance Profile***:
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If the cluster was destroyed without using Terraform it is possible that
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the AWS IAM Instance Profiles still remain. To delete them you can use
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the `AWS CLI` with the following command:
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```
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aws iam delete-instance-profile --region <region_name> --instance-profile-name <profile_name>
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```
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***Ansible Inventory doesnt get created:***
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It could happen that Terraform doesnt create an Ansible Inventory file automatically. If this is the case copy the output after `inventory=` and create a file named `hosts`in the directory `inventory` and paste the inventory into the file.
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**Architecture**
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Pictured is an AWS Infrastructure created with this Terraform project distributed over two Availability Zones.
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