Class: Kubernetes::Client

Inherits:
Object
  • Object
show all
Includes:
Utils
Defined in:
lib/hetzner/kubernetes/client.rb

Constant Summary

Constants included from Utils

Utils::CMD_FILE_PATH

Instance Method Summary collapse

Methods included from Utils

#run, #ssh, #verify_host_key, #wait_for_ssh, #which, #write_file

Constructor Details

#initialize(configuration:) ⇒ Client

Returns a new instance of Client.



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# File 'lib/hetzner/kubernetes/client.rb', line 9

def initialize(configuration:)
  @configuration = configuration
end

Instance Method Details

#deploy(masters:, workers:, master_definitions:, worker_definitions:) ⇒ Object 



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# File 'lib/hetzner/kubernetes/client.rb', line 13

def deploy(masters:, workers:, master_definitions:, worker_definitions:)
  @masters = masters
  @workers = workers
  @master_definitions = master_definitions
  @worker_definitions = worker_definitions

  @kube_api_server_args = configuration.fetch('kube_api_server_args', [])
  @kube_scheduler_args = configuration.fetch('kube_scheduler_args', [])
  @kube_controller_manager_args = configuration.fetch('kube_controller_manager_args', [])
  @kube_cloud_controller_manager_args = configuration.fetch('kube_cloud_controller_manager_args', [])
  @kubelet_args = configuration.fetch('kubelet_args', [])
  @kube_proxy_args = configuration.fetch('kube_proxy_args', [])
  @private_ssh_key_path = File.expand_path(configuration['private_ssh_key_path'])
  @public_ssh_key_path = File.expand_path(configuration['public_ssh_key_path'])
  @cluster_name = configuration['cluster_name']

  set_up_k3s

  update_nodes

  post_setup_deployments
end

#upgrade ⇒ Object 



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# File 'lib/hetzner/kubernetes/client.rb', line 36

def upgrade
  worker_upgrade_concurrency = workers.size - 1
  worker_upgrade_concurrency = 1 if worker_upgrade_concurrency.zero?

  cmd = <<~BASH
    kubectl apply -f - <<-EOF
      apiVersion: upgrade.cattle.io/v1
      kind: Plan
      metadata:
        name: k3s-server
        namespace: system-upgrade
        labels:
          k3s-upgrade: server
      spec:
        concurrency: 1
        version: #{new_k3s_version}
        nodeSelector:
          matchExpressions:
            - {key: node-role.kubernetes.io/master, operator: In, values: ["true"]}
        serviceAccountName: system-upgrade
        tolerations:
        - key: "CriticalAddonsOnly"
          operator: "Equal"
          value: "true"
          effect: "NoExecute"
        cordon: true
        upgrade:
          image: rancher/k3s-upgrade
    EOF
  BASH

  run cmd, kubeconfig_path: kubeconfig_path

  cmd = <<~BASH
    kubectl apply -f - <<-EOF
      apiVersion: upgrade.cattle.io/v1
      kind: Plan
      metadata:
        name: k3s-agent
        namespace: system-upgrade
        labels:
          k3s-upgrade: agent
      spec:
        concurrency: #{worker_upgrade_concurrency}
        version: #{new_k3s_version}
        nodeSelector:
          matchExpressions:
            - {key: node-role.kubernetes.io/master, operator: NotIn, values: ["true"]}
        serviceAccountName: system-upgrade
        prepare:
          image: rancher/k3s-upgrade
          args: ["prepare", "k3s-server"]
        cordon: true
        upgrade:
          image: rancher/k3s-upgrade
    EOF
  BASH

  run cmd, kubeconfig_path: kubeconfig_path

  puts 'Upgrade will now start. Run `watch kubectl get nodes` to see the nodes being upgraded. This should take a few minutes for a small cluster.'
  puts 'The API server may be briefly unavailable during the upgrade of the controlplane.'

  updated_configuration = configuration.raw
  updated_configuration['k3s_version'] = new_k3s_version

  File.write(config_file, updated_configuration.to_yaml)
end