cluster-api-provider-openstack

README

Kubernetes cluster-api-provider-openstack Project

This repository hosts a concrete implementation of an OpenStack provider for the cluster-api project.

Community, discussion, contribution, and support

Learn how to engage with the Kubernetes community on the community page.

You can reach the maintainers of this project at:

• #cluster-api-openstack on Kubernetes Slack
• SIG-Cluster-Lifecycle Mailing List

Code of conduct

Participation in the Kubernetes community is governed by the Kubernetes Code of Conduct.

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Compatibility with Cluster API, Kubernetes and OpenStack Versions

This provider's versions are compatible with the following versions of Cluster API:

	Cluster API v1alpha1 (v0.1)
OpenStack Provider v1alpha1 (ea309e7f)	✓

This provider's versions are able to install and manage the following versions of Kubernetes:

	Kubernetes 1.13.5+	Kubernetes 1.14
OpenStack Provider v1alpha1 (ea309e7f)	✓	✓

NOTE: Because the user is able to customize any user-data, it is also possible to deploy older versions. But we won't provide any examples or working templates. See user-data in the examples.

This provider's versions are able to install kubernetes to the following versions of OpenStack:

	OpenStack Pike	OpenStack Queens	OpenStack Rocky
OpenStack Provider v1alpha1 (ea309e7f)	✓	✓	✓

Each version of Cluster API for OpenStack will attempt to support two Kubernetes versions.

NOTE: As the versioning for this project is tied to the versioning of Cluster API, future modifications to this policy may be made to more closely align with other providers in the Cluster API ecosystem.

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Getting Started

Prerequisites

1. Install kubectl (see here).

2. You can use either VM, container or existing Kubernetes cluster act as bootstrap cluster.

   • If you want to use VM, install minikube, version 0.30.0 or greater.
   • If you want to use container, install kind.
   • If you want to use existing Kubernetes cluster, prepare your kubeconfig.

3. Install a driver if you are using minikube. For Linux, we recommend kvm2. For MacOS, we recommend VirtualBox.

4. An appropriately configured Go development environment

5. Build the clusterctl tool

   git clone https://github.com/kubernetes-sigs/cluster-api-provider-openstack $GOPATH/src/sigs.k8s.io/cluster-api-provider-openstack
   cd $GOPATH/src/sigs.k8s.io/cluster-api-provider-openstack/cmd/clusterctl
   go build
   

Cluster Creation

1. Create the cluster.yaml, machines.yaml, provider-components.yaml, and addons.yaml files if needed. If you want to use the generate-yaml.sh script, then you will need kustomize version 1.0.11, which can be found at https://github.com/kubernetes-sigs/kustomize/releases/tag/v1.0.11, and the latest go implementation of yq, which can be found at https://github.com/mikefarah/yq. The script has the following usage:

   cd examples/openstack
   ./generate-yaml.sh [options] <path/to/clouds.yaml> <openstack cloud> <provider os>
   cd ../..
   

   <provider os> specifies the operating system of the virtual machines Kubernetes will run on. Supported Operating Systems:

   • ubuntu
   • centos

   Quick notes on clouds.yaml

   We no longer support generating clouds.yaml. You should be able to get a valid clouds.yaml from your openstack cluster. However, make sure that the following fields are included, and correct.

   • username
   • user_domain_name
   • project_id
   • region_name
   • auth_url
   • password

   You will need to make changes to the generated files to create a working cluster. You can find some guidance on what needs to be edited, and how to create some of the required OpenStack resources in the Configuration documentation.

   Special notes on ssh keys and fetching admin.conf

   When running generate-yaml.sh the first time, a new ssh keypair is generated and stored as $HOME/.ssh/openstack_tmp and $HOME/.ssh/openstack_tmp.pub. In order to allow clusterctl to fetch Kubernetes' admin.conf from the master node, you must manually create the key pair in OpenStack. By default the generated machine.yaml uses cluster-api-provider-openstack to be the keyName. However, you are free to change that.

   e.g.

   openstack keypair create --public-key ~/.ssh/openstack_tmp.pub cluster-api-provider-openstack
   

2. Create a cluster:

   • If you are using minikube:

   ./clusterctl create cluster --bootstrap-type minikube --bootstrap-flags kubernetes-version=v1.12.3 \
     --provider openstack -c examples/openstack/out/cluster.yaml \
     -m examples/openstack/out/machines.yaml -p examples/openstack/out/provider-components.yaml
   

   To choose a specific minikube driver, please use the --bootstrap-flags vm-driver=xxx command line parameter. For example to use the kvm2 driver with clusterctl you woud add --bootstrap-flags vm-driver=kvm2, for linux, if you haven't installed any driver, you can add --bootstrap-flags vm-driver=none.

   • If you are using kind:

   ./clusterctl create cluster --bootstrap-type kind --provider openstack \
     -c examples/openstack/out/cluster.yaml -m examples/openstack/out/machines.yaml \
     -p examples/openstack/out/provider-components.yaml
   

   • If you are using existing Kubernetes cluster:

   ./clusterctl create cluster --bootstrap-cluster-kubeconfig ~/.kube/config \
     --provider openstack -c examples/openstack/out/cluster.yaml \
     -m examples/openstack/out/machines.yaml \
     -p examples/openstack/out/provider-components.yaml
   

   For the above command, the bootstrap-cluster-kubeconfig was located at ~/.kube/config, you must update it to use your kubeconfig.

Additional advanced flags can be found via help.

./clusterctl create cluster --help

Managed OpenStack Security Groups

In Cluster.spec.ProviderSpec there is a boolean option called ManagedSecurityGroups that, if set to true, will create a default set of security groups for the cluster. These are meant for a "standard" setup, and might not be suitable for every environment. Please review the rules below before you use them.

NOTE: For now, there is no way to automatically use these rules, which makes them a bit cumbersome to use, this will be possible in the near future.

The rules created are:

• A rule for the controlplane machine, that allows access from everywhere to port 22 and 443.
• A rule for all the machines, both the controlplane and the nodes that allow all traffic between members of this group.

Interacting with your cluster

If you are using kind, config the KUBECONFIG first before using kubectl:

export KUBECONFIG="$(kind get kubeconfig-path --name="clusterapi")"

Once you have created a cluster, you can interact with the cluster and machine resources using kubectl:

kubectl --kubeconfig=kubeconfig get clusters
kubectl --kubeconfig=kubeconfig get machines
kubectl --kubeconfig=kubeconfig get machines -o yaml

Cluster Deletion

This guide explains how to delete all resources that were created as part of your openstack Cluster API Kubernetes cluster.

1. Delete all of the node Machines in the cluster. Make sure to wait for the corresponding Nodes to be deleted before moving onto the next step. After this step, the master node will be the only remaining node.

   kubectl --kubeconfig=kubeconfig delete machines -l set=node
   kubectl --kubeconfig=kubeconfig get nodes
   

2. Delete the master machine.

   kubectl --kubeconfig=kubeconfig delete machines -l set=master
   

3. Delete the kubeconfig file that were created for your cluster.

   rm kubeconfig
   

4. Delete the ssh keypair that were created for your cluster machine.

   rm -rf $HOME/.ssh/openstack_tmp*
   

Trouble shooting

Please refer to Trouble shooting documentation for further info.