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kubernetes-sigs / kubespray

Deploy a Production Ready Kubernetes Cluster
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ansible aws bare-metal gce hacktoberfest high-availability k8s-sig-cluster-lifecycle kubernetes kubernetes-cluster kubespray

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Deploy a Production Ready Kubernetes Cluster

Kubernetes Logo

If you have questions, check the documentation at kubespray.io and join us on the kubernetes slack, channel #kubespray. You can get your invite here

Quick Start

Below are several ways to use Kubespray to deploy a Kubernetes cluster.

Ansible

Usage

Install Ansible according to Ansible installation guide then run the following steps:

# Copy ``inventory/sample`` as ``inventory/mycluster``
cp -rfp inventory/sample inventory/mycluster

# Update Ansible inventory file with inventory builder
declare -a IPS=(10.10.1.3 10.10.1.4 10.10.1.5)
CONFIG_FILE=inventory/mycluster/hosts.yaml python3 contrib/inventory_builder/inventory.py ${IPS[@]}

# Review and change parameters under ``inventory/mycluster/group_vars``
cat inventory/mycluster/group_vars/all/all.yml
cat inventory/mycluster/group_vars/k8s_cluster/k8s-cluster.yml

# Clean up old Kubernetes cluster with Ansible Playbook - run the playbook as root
# The option `--become` is required, as for example cleaning up SSL keys in /etc/,
# uninstalling old packages and interacting with various systemd daemons.
# Without --become the playbook will fail to run!
# And be mind it will remove the current kubernetes cluster (if it's running)!
ansible-playbook -i inventory/mycluster/hosts.yaml  --become --become-user=root reset.yml

# Deploy Kubespray with Ansible Playbook - run the playbook as root
# The option `--become` is required, as for example writing SSL keys in /etc/,
# installing packages and interacting with various systemd daemons.
# Without --become the playbook will fail to run!
ansible-playbook -i inventory/mycluster/hosts.yaml  --become --become-user=root cluster.yml

Note: When Ansible is already installed via system packages on the control node, Python packages installed via sudo pip install -r requirements.txt will go to a different directory tree (e.g. /usr/local/lib/python2.7/dist-packages on Ubuntu) from Ansible's (e.g. /usr/lib/python2.7/dist-packages/ansible still on Ubuntu). As a consequence, the ansible-playbook command will fail with:

ERROR! no action detected in task. This often indicates a misspelled module name, or incorrect module path.

This likely indicates that a task depends on a module present in requirements.txt.

One way of addressing this is to uninstall the system Ansible package then reinstall Ansible via pip, but this not always possible and one must take care regarding package versions. A workaround consists of setting the ANSIBLE_LIBRARY and ANSIBLE_MODULE_UTILS environment variables respectively to the ansible/modules and ansible/module_utils subdirectories of the pip installation location, which is the Location shown by running pip show [package] before executing ansible-playbook.

A simple way to ensure you get all the correct version of Ansible is to use the pre-built docker image from Quay. You will then need to use bind mounts to access the inventory and SSH key in the container, like this:

git checkout v2.26.0
docker pull quay.io/kubespray/kubespray:v2.26.0
docker run --rm -it --mount type=bind,source="$(pwd)"/inventory/sample,dst=/inventory \
  --mount type=bind,source="${HOME}"/.ssh/id_rsa,dst=/root/.ssh/id_rsa \
  quay.io/kubespray/kubespray:v2.26.0 bash
# Inside the container you may now run the kubespray playbooks:
ansible-playbook -i /inventory/inventory.ini --private-key /root/.ssh/id_rsa cluster.yml

Collection

See here if you wish to use this repository as an Ansible collection

Vagrant

For Vagrant we need to install Python dependencies for provisioning tasks. Check that Python and pip are installed:

python -V && pip -V

If this returns the version of the software, you're good to go. If not, download and install Python from here https://www.python.org/downloads/source/

Install Ansible according to Ansible installation guide then run the following step:

vagrant up

Documents

Supported Linux Distributions

Note: Upstart/SysV init based OS types are not supported.

Supported Components

Container Runtime Notes

Requirements

Hardware: These limits are safeguarded by Kubespray. Actual requirements for your workload can differ. For a sizing guide go to the Building Large Clusters guide.

Network Plugins

You can choose among ten network plugins. (default: calico, except Vagrant uses flannel)

The network plugin to use is defined by the variable kube_network_plugin. There is also an option to leverage built-in cloud provider networking instead. See also Network checker.

Ingress Plugins

Community docs and resources

Tools and projects on top of Kubespray

CI Tests

Build graphs

CI/end-to-end tests sponsored by: CNCF, Equinix Metal, OVHcloud, ELASTX.

See the test matrix for details.