Kubernetes VIM Installation

Tacker uses devstack-plugin-container to deploy a Kubernetes cluster.

  1. Edit local.conf for Kubernetes

    Add following plugin configurations for devstack-plugin-container.

    # Enable devstack-plugin-container, crio
KUBERNETES_VIM=True

# It is necessary to specify the patch version
# because it is the version used when executing "apt-get install" command.
K8S_VERSION="1.30.5"
K8S_TOKEN="9agf12.zsu5uh2m4pzt3qba"
CONTAINER_ENGINE="crio"
CRIO_VERSION="1.30.5"

enable_plugin devstack-plugin-container https://opendev.org/openstack/devstack-plugin-container master

    Public network is used to launch LoadBalancer for Services in Kubernetes. Setting public subnet is described in [1].

    You can find whole of examples of local.conf in [2] and [3].

  2. In CentOS environment install Kubernetes packages and start ovn services before executing stack.sh.

    Command:

    $ sudo cat <<EOF > /etc/yum.repos.d/kubernetes.repo
  [kubernetes]
  name=Kubernetes
  baseurl=https://packages.cloud.google.com/yum/repos/kubernetes-el7-x86_64
  enabled=1
  gpgcheck=1
  repo_gpgcheck=1
  gpgkey=https://packages.cloud.google.com/yum/doc/yum-key.gpg https://packages.cloud.google.com/yum/doc/rpm-package-key.gpg
  EOF
$ sudo chmod 755 /etc/yum.repos.d/kubernetes.repo
$ sudo dnf install kubeadm -y
$ sudo yum install -y centos-release-openstack-victoria
$ sudo yum install -y openvswitch
$ sudo yum install -y openvswitch-ovn-common
$ sudo yum install -y openvswitch-ovn-central
$ sudo yum install -y openvswitch-ovn-host
$ sudo systemctl start ovn-northd.service
$ sudo systemctl start ovn-controller.service
$ sudo systemctl start ovs-vswitchd.service
$ sudo systemctl start ovsdb-server.service

  3. Run devstack installation

    Command:

    $ ./stack.sh

  4. Setup Kubernetes VIM configuration

    Now you are ready to register Kubernetes VIM if you complete devstack installation. You can setup configuration file for Kubernetes VIM by using a dedicated script for the job or editing it from scratch.

    The first way is to run gen_vim_config.sh with options for generating the configuration file as described in here. Go to TACKER_ROOT directory which is the root of tacker’s repository. You need to add -t k8s at least for Kubernetes, or it generates configurations for OpenStack. You can skip steps below before the section Register Kubernetes VIM.

    $ cd TACKER_ROOT
$ bash tools/gen_vim_config.sh -t k8s

    This script tries to get all required parameters from your environment although you can give any of parameters with specific options. Refer the usages in help message, -h option, for the details.

    On the other hand, you’re required to get required parameters with kubectl command if you edit the configuration from scratch.

    • Create Secret

      First, you can check whether a Secret containing a bearer token already exists. If it does not exist, you can create a Secret according to the following file. If it already exists, skip this step and start with Get “Bearer Token”.

      $ cat default-token.yaml
apiVersion: v1
kind: Secret
metadata:
  name: default-token-cfx5m
  namespace: default
  annotations:
    kubernetes.io/service-account.name: "default"
type: kubernetes.io/service-account-token

      Use default-token.yaml to create a Secret.

      Command:

      $ kubectl apply -f default-token.yaml

      Result:

      secret/default-token-cfx5m created

    • Get “Bearer Token”

      You have to confirm Kubernetes Secret name which contains bearer token.

      Command:

      $ kubectl get secret

      Result:

      NAME                  TYPE                                  DATA   AGE
default-token-cfx5m   kubernetes.io/service-account-token   3      94m

      Then, you can get the bearer token.

      Command:

      $ TOKEN=$(kubectl get secret default-token-cfx5m -o jsonpath="{.data.token}" | base64 --decode) && echo $TOKEN

      Result:

      eyJhbGciOiJSUzI1NiIsImtpZCI6ImdTeGhkUlBNRkJwemo0eXdpMmxxT2Y1aWkzYUhwRERCTWlxMzZFemFKSkUifQ.eyJpc3MiOiJrdWJlcm5ldGVzL3NlcnZpY2VhY2NvdW50Iiwia3ViZXJuZXRlcy5pby9zZXJ2aWNlYWNjb3VudC9uYW1lc3BhY2UiOiJkZWZhdWx0Iiwia3ViZXJuZXRlcy5pby9zZXJ2aWNlYWNjb3VudC9zZWNyZXQubmFtZSI6ImRlZmF1bHQtdG9rZW4tY2Z4NW0iLCJrdWJlcm5ldGVzLmlvL3NlcnZpY2VhY2NvdW50L3NlcnZpY2UtYWNjb3VudC5uYW1lIjoiZGVmYXVsdCIsImt1YmVybmV0ZXMuaW8vc2VydmljZWFjY291bnQvc2VydmljZS1hY2NvdW50LnVpZCI6IjNhOTNiNjA0LTJjY2EtNDllZi05ODMwLWI5NDZhZjI2OTAyNyIsInN1YiI6InN5c3RlbTpzZXJ2aWNlYWNjb3VudDpkZWZhdWx0OmRlZmF1bHQifQ.yWmZMKuCRn_9Hw07wzee2Gr072NcexuKkaG2HaBamd3BOOAaypb7a12UiKcjqQYsDq32jVGMswSroTJOJtm7xccVbU2lz6CMhTRtDbPKOQm7DLyYdpBoRAoqE8fpy4aF5agqpFYmhYHBoz2VC-sgTwWjuY5XkJ81X9rZWlTCj9p3QkanH2z77lLXo-muthDOOuNm_J05FyR_J1epYXm8JbEpTrj1upaQoKZ9hoKKQrd1crW0stqymcyiLxfPGtSW8dO6GZS4v1vTiIhAEBg3kyQsOPz_nEmDxuYXrcMJxQV8MxWvm3uLOu7wN6-MPsSdw1CQdOfjycTh0D9rG4pxUw

      Note

      In Kubernetes data model, values contained under .data is encoded with Base64 format, thus you must decode it with base64 --decode or base64 -d command to use it as a bearer token.

      Before using this token, users have to apply administrator role to this token.

      Command:

      $ kubectl create clusterrolebinding cluster-admin-binding \
--clusterrole cluster-admin --serviceaccount=default:default

      Result:

      clusterrolebinding.rbac.authorization.k8s.io/cluster-admin-binding created

    • Get ssl_ca_cert:

      Users can get more information for authenticating to Kubernetes cluster.

      Command:

      $ kubectl get secrets default-token-cfx5m -o jsonpath="{.data.ca\.crt}" | base64 --decode

      Result:

      -----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----

    • Get Kubernetes server url

      By default Kubernetes API server listens on https://127.0.0.1:6443 and https://{HOST_IP}:6443. Users can get this information through kubectl cluster-info command and try to access API server with the bearer token described in the previous step.

      First, you have to confirm the API endpoint that your Kubernetes cluster exposes.

      Command:

      $ kubectl cluster-info

      Result:

      Kubernetes control plane is running at https://172.30.202.39:6443

To further debug and diagnose cluster problems, use 'kubectl cluster-info dump'.

      Then, you can confirm the API endpoint and your bearer token are available.

      Command:

      $ curl -k https://172.30.202.39:6443/api/ -H "Authorization: Bearer $TOKEN"

      Result:

      {
   "kind": "APIVersions",
   "versions": [
   "v1"
   ],
   "serverAddressByClientCIDRs": [
      {
         "clientCIDR": "0.0.0.0/0",
         "serverAddress": "172.30.202.39:6443"
      }
   ]
}

      Note

      Because SSL certificate used in Kubernetes API server is self-signed, curl returns SSL certificate problem in the response. Users can use -k or --insecure option to ignore SSL certificate warnings, or --cacert <path/to/ssl_ca_cert_file> option to use ssl_ca_cert in the verification of API server’s SSL certificate.

  5. Register Kubernetes VIM

    In vim_config.yaml, project_name is fixed as “default”, that will use to support multi tenant on Kubernetes in the future.

    Create vim_config.yaml file for Kubernetes VIM as following examples:

    auth_url: "https://172.30.202.39:6443"
bearer_token: "eyJhbGciOiJSUzI1NiIsImtpZCI6ImdTeGhkUlBNRkJwemo0eXdpMmxxT2Y1aWkzYUhwRERCTWlxMzZFemFKSkUifQ.eyJpc3MiOiJrdWJlcm5ldGVzL3NlcnZpY2VhY2NvdW50Iiwia3ViZXJuZXRlcy5pby9zZXJ2aWNlYWNjb3VudC9uYW1lc3BhY2UiOiJkZWZhdWx0Iiwia3ViZXJuZXRlcy5pby9zZXJ2aWNlYWNjb3VudC9zZWNyZXQubmFtZSI6ImRlZmF1bHQtdG9rZW4tY2Z4NW0iLCJrdWJlcm5ldGVzLmlvL3NlcnZpY2VhY2NvdW50L3NlcnZpY2UtYWNjb3VudC5uYW1lIjoiZGVmYXVsdCIsImt1YmVybmV0ZXMuaW8vc2VydmljZWFjY291bnQvc2VydmljZS1hY2NvdW50LnVpZCI6IjNhOTNiNjA0LTJjY2EtNDllZi05ODMwLWI5NDZhZjI2OTAyNyIsInN1YiI6InN5c3RlbTpzZXJ2aWNlYWNjb3VudDpkZWZhdWx0OmRlZmF1bHQifQ.yWmZMKuCRn_9Hw07wzee2Gr072NcexuKkaG2HaBamd3BOOAaypb7a12UiKcjqQYsDq32jVGMswSroTJOJtm7xccVbU2lz6CMhTRtDbPKOQm7DLyYdpBoRAoqE8fpy4aF5agqpFYmhYHBoz2VC-sgTwWjuY5XkJ81X9rZWlTCj9p3QkanH2z77lLXo-muthDOOuNm_J05FyR_J1epYXm8JbEpTrj1upaQoKZ9hoKKQrd1crW0stqymcyiLxfPGtSW8dO6GZS4v1vTiIhAEBg3kyQsOPz_nEmDxuYXrcMJxQV8MxWvm3uLOu7wN6-MPsSdw1CQdOfjycTh0D9rG4pxUw"
ssl_ca_cert: "None"
project_name: "default"
type: "kubernetes"

    Or vim_config.yaml with ssl_ca_cert enabled:

    auth_url: "https://172.30.202.39:6443"
bearer_token: "eyJhbGciOiJSUzI1NiIsImtpZCI6ImdTeGhkUlBNRkJwemo0eXdpMmxxT2Y1aWkzYUhwRERCTWlxMzZFemFKSkUifQ.eyJpc3MiOiJrdWJlcm5ldGVzL3NlcnZpY2VhY2NvdW50Iiwia3ViZXJuZXRlcy5pby9zZXJ2aWNlYWNjb3VudC9uYW1lc3BhY2UiOiJkZWZhdWx0Iiwia3ViZXJuZXRlcy5pby9zZXJ2aWNlYWNjb3VudC9zZWNyZXQubmFtZSI6ImRlZmF1bHQtdG9rZW4tY2Z4NW0iLCJrdWJlcm5ldGVzLmlvL3NlcnZpY2VhY2NvdW50L3NlcnZpY2UtYWNjb3VudC5uYW1lIjoiZGVmYXVsdCIsImt1YmVybmV0ZXMuaW8vc2VydmljZWFjY291bnQvc2VydmljZS1hY2NvdW50LnVpZCI6IjNhOTNiNjA0LTJjY2EtNDllZi05ODMwLWI5NDZhZjI2OTAyNyIsInN1YiI6InN5c3RlbTpzZXJ2aWNlYWNjb3VudDpkZWZhdWx0OmRlZmF1bHQifQ.yWmZMKuCRn_9Hw07wzee2Gr072NcexuKkaG2HaBamd3BOOAaypb7a12UiKcjqQYsDq32jVGMswSroTJOJtm7xccVbU2lz6CMhTRtDbPKOQm7DLyYdpBoRAoqE8fpy4aF5agqpFYmhYHBoz2VC-sgTwWjuY5XkJ81X9rZWlTCj9p3QkanH2z77lLXo-muthDOOuNm_J05FyR_J1epYXm8JbEpTrj1upaQoKZ9hoKKQrd1crW0stqymcyiLxfPGtSW8dO6GZS4v1vTiIhAEBg3kyQsOPz_nEmDxuYXrcMJxQV8MxWvm3uLOu7wN6-MPsSdw1CQdOfjycTh0D9rG4pxUw"
ssl_ca_cert: "-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----"
project_name: "default"
type: "kubernetes"

    Run Tacker command for register VIM:

    Command:

    $ openstack vim register --config-file vim_config.yaml vim-kubernetes

    Result:

    +----------------+-----------------------------------------------+
| Field          | Value                                         |
+----------------+-----------------------------------------------+
| auth_cred      | {                                             |
|                |     "bearer_token": "***",                    |
|                |     "ssl_ca_cert": "None",                    |
|                |     "auth_url": "https://172.30.202.39:6443", |
|                |     "username": "None",                       |
|                |     "key_type": "barbican_key",               |
|                |     "secret_uuid": "***",                     |
|                |     "password": "***"                         |
|                | }                                             |
| auth_url       | https://172.30.202.39:6443                    |
| created_at     | 2021-09-17 01:26:28.372552                    |
| description    |                                               |
| id             | 884ec305-c8ca-47ef-8cba-fafceabeda30          |
| is_default     | False                                         |
| name           | vim-kubernetes                                |
| placement_attr | {                                             |
|                |     "regions": [                              |
|                |         "default",                            |
|                |         "kube-node-lease",                    |
|                |         "kube-public",                        |
|                |         "kube-system"                         |
|                |     ]                                         |
|                | }                                             |
| project_id     | 8cd3cc798ae14227a84f7b50c5ef984a              |
| status         | ACTIVE                                        |
| type           | kubernetes                                    |
| updated_at     | None                                          |
| vim_project    | {                                             |
|                |     "name": "default"                         |
|                | }                                             |
+----------------+-----------------------------------------------+

    In placement_attr, there are four regions: ‘default’, ‘kube-node-lease’, ‘kube-public’ and ‘kube-system’, that map to namespace in Kubernetes environment.

    After the successful installation of VIM, you can get VIM information as follows:

    Command:

    $ openstack vim list

    Result:

    +--------------------------------------+----------------+----------------------------------+------------+------------+--------+
| ID                                   | Name           | Tenant_id                        | Type       | Is Default | Status |
+--------------------------------------+----------------+----------------------------------+------------+------------+--------+
| 884ec305-c8ca-47ef-8cba-fafceabeda30 | vim-kubernetes | 8cd3cc798ae14227a84f7b50c5ef984a | kubernetes | False      | ACTIVE |
+--------------------------------------+----------------+----------------------------------+------------+------------+--------+

    You can update those VIM information with openstack vim set:

    Command:

    $ openstack vim set --config-file path/to/updated/config 884ec305-c8ca-47ef-8cba-fafceabeda30

    When updating Kubernetes VIM, you can update VIM information (such as bearer_token and ssl_ca_cert) except auth_url and type of VIM.

    You can get the detail of VIM information with openstack vim show:

    Command:

    $ openstack vim show 884ec305-c8ca-47ef-8cba-fafceabeda30

    If you no longer use the Kubernetes VIM, you can delete it with openstack vim delete:

    Command:

    $ openstack vim delete 884ec305-c8ca-47ef-8cba-fafceabeda30

References