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README.md
hetzner-csi.yml

README.md

Install Hetzner CSI driver

This playbook is used in my blog post Kubernetes the not so hard way with Ansible - Persistent storage - Part 1

This playbook uses the Ansible's k8s module. That means you need at least Ansible v2.6 as it was added with this version (the module was formerly known as openshift_raw or k8s_raw ;-) ). This modules uses the OpenShift Python client to perform CRUD operations on Kubernetes objects. That means you need to install openshift pip e.g.: pip3 install openshift (also see requirements.

The first thing we need for the Hetzner CSI driver is an API token. You can create it in the Hetzner Cloud Console. For the token description/name you can use hcloud-csi as value e.g. If you have this token created we can define an Ansible variables accordingly.

So in group_vars/all.yml e.g. you need to define a few variables:

# The Hetzner API token
hcloud_csi_token: "abcdefghijklmnopqrstuvwz"

# The namespace where all CSI resources should be installed:
hcloud_namespace: "kube-system"

# The playbook installes a few resources like:
# Secret, StorageClass, ServiceAccount, ClusterRole,
# ClusterRoleBinding, StatefulSet and DaemonSet
# All this resources have names and the names will be prefixed
# with the prefix defined here:
hcloud_resource_prefix: "hcloud"

# Make {{ hcloud_resource_prefix }}-volumes the default
# storageClass. If you only have this storageClass then
# just set it to "true". If you've other storageClass'es
# already then "false" might be your choise.
hcloud_is_default_class: "true"

# The "volumeBindingMode" field controls when volume binding and
# dynamic provisioning should occur. The default value is "Immediate".
# The "Immediate" mode indicates that volume binding and dynamic
# provisioning occurs once the "PersistentVolumeClaim" is created.
# The "WaitForFirstConsumer" mode which will delay the binding and
# provisioning of a "PersistentVolume" until a Pod using the
# "PersistentVolumeClaim" is created. "PersistentVolumes" will be
# selected or provisioned conforming to the topology that is specified
# by the Pod’s scheduling constraints. These include, but are not
# limited to, resource requirements, node selectors, pod affinity
# and anti-affinity, and taints and tolerations.
hcloud_volume_binding_mode: "WaitForFirstConsumer"

# Directory where kubelet configuration is located
k8s_worker_kubelet_conf_dir: "/var/lib/kubelet"

To install all resources needed for Hetzner CSI driver run (for further options read on):

ansible-playbook hetzner-csi.yml

The Ansible k8s module reads the Kubernetes authorization information from ${HOME}/.kube/config by default. If you've the variables ansible_become_user: root and/or ansible_become: true defined then ${HOME} will become /root during execution of the playbook and the probability that the k8s module will find the Kubernetes authorization information at /root/.kube/config isn't that high ;-) So you may need to specify the correct user like in this example (of course replace <username> with the correct username):

ansible-playbook --become-user=<username> hetzner-csi.yml

All resources have a tag so e.g. if you only want to install the Kubernetes DaemonSet needed for Hetzner CSI driver use this command:

ansible-playbook --tags=install-daemonset hetzner-csi.yml

Have a look at tasks/install.yml and tasks/delete.yml what tags are available (Sadly ansible-playbook --list-tasks hetzner-csi.yml doesn't show tags included with import_tasks). To delete all Hetzner CSI driver resources use

ansible-playbook -e delete=true hetzner-csi.yml

To only delete a specific resource you can also use tags e.g.:

ansible-playbook -e delete=true --tags=delete-daemonset hetzner-csi.yml
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