You are viewing documentation for Kubernetes version: v1.21
Kubernetes v1.21 documentation is no longer actively maintained. The version you are currently viewing is a static snapshot. For up-to-date documentation, see the latest version.
Installing Kubernetes with Kubespray
This quickstart helps to install a Kubernetes cluster hosted on GCE, Azure, OpenStack, AWS, vSphere, Packet (bare metal), Oracle Cloud Infrastructure (Experimental) or Baremetal with Kubespray.
- a highly available cluster
- composable attributes
- support for most popular Linux distributions
- Ubuntu 16.04, 18.04, 20.04
- CentOS/RHEL/Oracle Linux 7, 8
- Debian Buster, Jessie, Stretch, Wheezy
- Fedora 31, 32
- Fedora CoreOS
- openSUSE Leap 15
- Flatcar Container Linux by Kinvolk
- continuous integration tests
Creating a cluster
(1/5) Meet the underlay requirements
Provision servers with the following requirements:
- Ansible v2.9 and python-netaddr is installed on the machine that will run Ansible commands
- Jinja 2.11 (or newer) is required to run the Ansible Playbooks
- The target servers must have access to the Internet in order to pull docker images. Otherwise, additional configuration is required (See Offline Environment)
- The target servers are configured to allow IPv4 forwarding
- Your ssh key must be copied to all the servers part of your inventory
- The firewalls are not managed, you'll need to implement your own rules the way you used to. in order to avoid any issue during deployment you should disable your firewall
- If kubespray is ran from non-root user account, correct privilege escalation method should be configured in the target servers. Then the
ansible_becomeflag or command parameters
-bshould be specified
Kubespray provides the following utilities to help provision your environment:
(2/5) Compose an inventory file
(3/5) Plan your cluster deployment
Kubespray provides the ability to customize many aspects of the deployment:
- Choice deployment mode: kubeadm or non-kubeadm
- CNI (networking) plugins
- DNS configuration
- Choice of control plane: native/binary or containerized
- Component versions
- Calico route reflectors
- Component runtime options
- Certificate generation methods
Kubespray customizations can be made to a variable file. If you are getting started with Kubespray, consider using the Kubespray defaults to deploy your cluster and explore Kubernetes.
(4/5) Deploy a Cluster
Next, deploy your cluster:
Cluster deployment using ansible-playbook.
ansible-playbook -i your/inventory/inventory.ini cluster.yml -b -v \ --private-key=~/.ssh/private_key
Large deployments (100+ nodes) may require specific adjustments for best results.
(5/5) Verify the deployment
Kubespray provides a way to verify inter-pod connectivity and DNS resolve with Netchecker. Netchecker ensures the netchecker-agents pods can resolve DNS requests and ping each over within the default namespace. Those pods mimic similar behavior of the rest of the workloads and serve as cluster health indicators.
Kubespray provides additional playbooks to manage your cluster: scale and upgrade.
Scale your cluster
You can add worker nodes from your cluster by running the scale playbook. For more information, see "Adding nodes". You can remove worker nodes from your cluster by running the remove-node playbook. For more information, see "Remove nodes".
Upgrade your cluster
You can upgrade your cluster by running the upgrade-cluster playbook. For more information, see "Upgrades".
You can reset your nodes and wipe out all components installed with Kubespray via the reset playbook.
Caution: When running the reset playbook, be sure not to accidentally target your production cluster!
Check out planned work on Kubespray's roadmap.