Deploy High Availability Kubernetes with Kubespray
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This document discusses how to deploy a Kubernetes cluster locally using Kubespray and Ansible. It begins by introducing Kubespray and Ansible and explaining how they can be used together to deploy Kubernetes. Next, it provides instructions for installing the necessary tools like Vagrant and Ansible and cloning the Kubespray repository. It then walks through running vagrant up to deploy the Kubernetes cluster locally. The document also discusses how VirtualBox and Vagrant are used to automate and manage the virtual machines, and how Ansible deploys Kubernetes components to the machines. It concludes by demonstrating how to test the local Kubernetes cluster using kubectl.
Deploy High Availability Kubernetes with Kubespray
- 1. Kubespray Deploy Kubernetes Cluster with Ansible
- 3. Headlines • Deploy a K8s cluster on laptop • Talk a little about Vagrant, a VM managing tool • Kubespray & Ansible • Try our localhost K8s cluster
- 4. Prerequisite • virtualbox 5.1+ https://www.virtualbox.org/wiki/Downloads • vagrant 2.0.x+ https://www.vagrantup.com/downloads.html
- 5. Install Ansible # Ubuntu apt-add-repository ppa:ansible/ansible && apt-get update && apt-get install -y python3 ansible && pip install netaddr # Mac pip install ansible pip install netaddr port install py27-netaddr # if you’re using MacPort # netaddr is required by Kubespray
- 6. Let’s Get Started clone https://github.com/kubernetes-incubator/kubespray.git cd kubespray vagrant up # All done. Let’s get to more details while waiting. (It takes about 20 mins on my Mac lol)
- 7. Virtualbox • K8s runs on servers, and Virtualbox is our server virtualizer • Virtualbox come with GUI, but we don’t use it because • Clicking is time-consuming and engineers are lazy • Bad for automation. Manual operation causes mistake. • Lack of scalability. We can click 10 VMs but how about 100+ VMs.
- 8. Vagrant • Kubespray provides vagrant for deploy K8s on VMs. • Vagrant create you VMs with Vagrtantfile, a ruby based script. • A script is essential for automation. • Vagrant bring VMs up & down within 1 command. https://www.vagrantup.com/
- 9. Vagrant Operations vagrant up (already done) vagrant status vagrant ssh k8s-01 vagrant destroy
- 10. What vagrant do? • After vagrant up, vagrant create VMs with virtual box • Vagrant also make necessary provisions to VMs • Vagrant deploy k8s on to VMs with Kubespray
- 11. Vagrant & CICD • Commit Vagrantfile to source code • Bring VMs up & down • Testing app on K8s and VMs • Clean up VMs with vagrant
- 12. Ansible • Ansible is a IT automation tools. • Ansible-playbook is a script to modify remote servers • Check components status on each step • Come with lots of handy tools (better than shell script)
- 13. Kubespray • Deploy k8s with ansible-playbook • Available on AWS, GCE, or baremetal • High Available cluster • Install K8s components to each servers https://github.com/kubernetes-incubator/kubespray
- 14. Done!!
- 16. Kubectl • Kubectl is a k8s client tool to control k8s cluster • Kubectl convert commands to API call to k8s cluster API server • Kubectl use authorized context
- 17. Deploy to Real Servers • ansible-playbook http://docs.ansible.com/ansible/latest/intro_installation.htm l • kubectl https://kubernetes.io/docs/tasks/tools/install- kubectl/ • Check inventory/mycluster/hosts.ini • playbook -i inventory/myCluster/hosts.ini cluster.yml
- 18. Thank you