setup-k8-with-ansible-and-terraform

Setup Kubernetes with Ansible and Terraform

Prerequisites: - Generate a public and private key-pairs using the command below the guide

- Change `terraform-kubernetes-infrastructure/files/Exp-US2.pub` to your public key which you want to use as EC2 Key-Pair

- In `terraform-kubernetes-infrastructure/variables.tf` change public_key_path default attribute to your public key path which you have added in the first step

- Add your EC2 Key-Pair in `ansible-setup-kubernetes/data` folder

- In `terraform-kubernetes-infrastructure/inventory.tf` change ansible_ssh_private_key_file for each host to the location of your private EC2 Key-Pair inside ansible's configuration folder(`ansible-setup-kubernetes`):
For Example ./data/Private.pem

Setup Kubernetes Master and Nodes with Terraform: - Execute terraform apply - Copy the generated inventory terraform-inventory-output.yml into setup-kubernetes/inventory folder

Setup Kubernetes Master and Nodes with Ansible: - Run setup_kubernetes.yml playbook against the "/inventory" machines to setup initial docker and kubernetes configurations: ansible-playbook -i ./inventory setup_kubernetes.yml - Run setup_kube_master.yml to setup the kube-master machine: ansible-playbook -i ./inventory setup_kube_master.yml - Run setup_kube_nodes.yml to setup the kube-node machines: ansible-playbook -i ./inventory setup_kube_nodes.yml - Login in to kube-master with: ssh -i Private.pem centos@<kube_master_private_ip> and execute kubectl get nodes to see all nodes in the cluster

Setup remote access to Kubernetes-API: - On master copy /etc/kubernetes/admin.config to your local machine - Use the script below to merge your current configuration and the new one export KUBECONFIG=~/.kube/config:~/someotherconfig kubectl config view --flatten > newconfig.config cp newconfig.config ~/.kube/config

Experienced problems after "setup_kubernetes.yml" sometimes EC2 machine receives kernel panic and does not want to boot after the playbook finishes. Now should be gone.

P.S: For testing ansible with docker - you have to expose the docker host

// Import a EC2 Key-Pair aws ec2 import-key-pair --key-name Exp-US2 --public-key-material file://./Exp-US2.pub

// Generate Public and Private Key-Pair ssh-keygen -f ./key-pair -t ecdsa -b 521

// Generate Public Key from your Private Key ssh-keygen -y -f ./Exp-US2.pem > ./Exp-US2.pub

// Remove the directory path from the shell terminal export PS1="\u > "

// Ansible Ad-Hoc - Restart all machines in list ansible -i hosts all -m command -a "reboot" -u centos --become

// Restart a specific instances ansible -i hosts "kube-master, kube-node1, kube-node2" -m command -a "reboot" -u centos --become