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k8s_control

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This is a module that installs and configures apiserver, controller-manager and scheduler - Kubernetes components that are required for control plane node in a cluster. Inspired by https://github.com/kelseyhightower/kubernetes-the-hard-way .

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Version information

  • 0.1.0 (latest)
released Feb 19th 2021
This version is compatible with:
  • Puppet Enterprise 2019.8.x, 2019.7.x, 2019.5.x, 2019.4.x, 2019.3.x, 2019.2.x, 2019.1.x, 2019.0.x, 2018.1.x, 2017.3.x, 2017.2.x, 2016.4.x
  • Puppet >= 4.10.0 < 7.0.0
  • CentOS
    ,
    OracleLinux
    ,
    RedHat
    ,
    Scientific

Start using this module

  • r10k or Code Manager
  • Bolt
  • Manual installation
  • Direct download

Add this module to your Puppetfile:

mod 'arrnorets-k8s_control', '0.1.0'
Learn more about managing modules with a Puppetfile

Add this module to your Bolt project:

bolt module add arrnorets-k8s_control
Learn more about using this module with an existing project

Manually install this module globally with Puppet module tool:

puppet module install arrnorets-k8s_control --version 0.1.0

Direct download is not typically how you would use a Puppet module to manage your infrastructure, but you may want to download the module in order to inspect the code.

Download

Documentation

arrnorets/k8s_control — version 0.1.0 Feb 19th 2021

Table of contents

  1. Common purpose
  2. Compatibility
  3. Installation
  4. Config example in Hiera and result files

1. Common purpose

This is a module that installs and configures apiserver, controller-manager and scheduler - Kubernetes components that are required for control plane node in a cluster. In the end you will receive a server that is a part of Kubernetes cluster's control plane. See https://github.com/kelseyhightower/kubernetes-the-hard-way chapter 08 for detailed explanation.

Inspired by https://github.com/kelseyhightower/kubernetes-the-hard-way .

2. Compatibility

This module was tested on CentOS 7.

3. Installation

mod 'k8s_workernode',
    :git => 'https://github.com/arrnorets/puppet-k8s_control_plane.git',
    :ref => 'main'

4. Config example in Hiera and result files

This module follows the concept of so called "XaaH in Puppet". The principles are described here and here.

Here is the example of config in Hiera:


# First of all you have to generate at least CA and Kubernetes key-cert pairs in order to configure authentication of API server against ETCD and against other management components. 
# Kubernetes key-cert pair will be used as K8s API TLS credentials. See more deatils on https://github.com/kelseyhightower/kubernetes-the-hard-way, chapters 04, 05 and 06.

k8s_tls_certs:
  entities:
    ca:
      key: |
        <Insert your ca key here!>
      cert: |
        <Insert your ca cert here!>
    admin:
      key: |
        <Insert your admin key here!>
      cert: |
        <Insert your admin cert here!>
    kube_controller:
      key: |
        <Insert your controller-manager key here!>
      cert: |
        <Insert your controller-manager cert here!>
    kube_scheduler:
      key: |
        <Insert your scheduler key here!>
      cert: |
        <Insert your scheduler cert here!>
    kubernetes:
      key: |
        <Insert your kubernetes key here!>
      cert: |
        <Insert your kubernetes cert here!>
    service-accounts:
      key: |
        <Insert your service-accounts key here!>
      cert: |
        <Insert your service-accounts cert here!>

k8s_control_plane:
  
  # Root directory for configs ad kubeconfigs
  rootdirs:
    - '/etc/k8s'
    - '/etc/k8s/conf'
    - '/etc/k8s/kubeconfig'
    - '/etc/k8s/yamlconf'

  # /* Root dir for data files like keys, certs etc if not embedded. */
  vardir: '/var/lib/k8s'

  kubectl:
    pkg_name: 'kubernetes-kubectl'
    pkg_version: '1.18.14-1.el7'

    # /* Path to kubectl kubeconfig */
    path_to_admin_kubeconfig: '/etc/k8s/kubeconfig/admin.kubeconfig'
    
    # /* Path to the directory where manifests to apply are placed */
    yamldir: '/etc/k8s/yamlconf'

    # /* Host where manifests from yamldir can be applied with kubectl to cluster. */
    management_host: 'k8s-cp1.asgardahost.ru'

  apiserver:
    pkg_name: 'kubernetes-kube-apiserver'
    pkg_version: '1.18.14-1.el7'
    enable: true

    # /* Apiserver unit file parameters. */
    parameters:
      binarypath: '/opt/k8s/kube-apiserver'
      common:
        allow-privileged: true
        apiserver-count: 3
        audit-log-maxage: 30
        audit-log-maxbackup: 3
        audit-log-maxsize: 100
        audit-log-path: '/var/log/audit.log'
        authorization-mode: 'Node,RBAC'
        bind-address: '0.0.0.0'
        client-ca-file: '/var/lib/k8s/own_ca.crt'
        enable-admission-plugins: 'NamespaceLifecycle,NodeRestriction,LimitRanger,ServiceAccount,DefaultStorageClass,ResourceQuota'
        etcd-cafile: '/var/lib/k8s/own_ca.crt'
        etcd-certfile: '/var/lib/k8s/k8s-api.crt'
        etcd-keyfile: '/var/lib/k8s/k8s-api.key'
        etcd-servers: 'https://192.168.100.8:2379,https://192.168.100.9:2379,https://192.168.100.10:2379'
        event-ttl: '1h'
        encryption-provider-config: '/var/lib/k8s/encryption-config.yaml'
        kubelet-certificate-authority: '/var/lib/k8s/own_ca.crt'
        kubelet-client-certificate: '/var/lib/k8s/k8s-api.crt'
        kubelet-client-key: '/var/lib/k8s/k8s-api.key'
        kubelet-https: 'true'
        runtime-config: 'api/all=true'
        service-account-key-file: '/var/lib/k8s/service-accounts.crt'
        service-cluster-ip-range: '10.32.0.0/24'
        service-node-port-range: '30000-32767'
        tls-cert-file: '/var/lib/k8s/k8s-api.crt'
        tls-private-key-file: '/var/lib/k8s/k8s-api.key'
        v: 2

      # /* Obligatory hash where all apiservers in the folowing format must be enumerated. */
      apiservers_advertise:
        k8s-cp1:
          ip_address: "192.168.100.8"
        k8s-cp2:
          ip_address: "192.168.100.9"
        k8s-cp3:
          ip_address: "192.168.100.10"

  scheduler:
    pkg_name: 'kubernetes-kube-scheduler'
    pkg_version: '1.18.14-1.el7'
    enable: true

    # /* Parameters for scheduler unit file. */
    parameters:
      binarypath: '/opt/k8s/kube-scheduler'
      common:
        config: '/etc/k8s/conf/kube-scheduler.yaml'
        v: 2

      # /* Scheduler config */
      conf:
        '/etc/k8s/conf/kube-scheduler.yaml':
          apiVersion: kubescheduler.config.k8s.io/v1alpha1
          kind: KubeSchedulerConfiguration
          clientConnection:
            kubeconfig: "/etc/k8s/kubeconfig/kube-scheduler.kubeconfig"
          leaderElection:
            leaderElect: true

  control-manager:
    pkg_name: 'kubernetes-kube-controller-manager'
    pkg_version: '1.18.14-1.el7'
    enable: true

    # /* Parameters for control-manager unit file. */
    parameters:
      binarypath: '/opt/k8s/kube-controller-manager'
      common:
        address: '0.0.0.0'
        cluster-cidr: '10.200.0.0/16'
        cluster-name: 'k8s-asgardahost'
        cluster-signing-cert-file: '/var/lib/k8s/own_ca.crt'
        cluster-signing-key-file: '/var/lib/k8s/own_ca.key'
        kubeconfig: '/etc/k8s/kubeconfig/kube-controller-manager.kubeconfig'
        leader-elect: true
        root-ca-file: '/var/lib/k8s/own_ca.crt'
        service-account-private-key-file: '/var/lib/k8s/service-accounts.key'
        service-cluster-ip-range: '10.32.0.0/24'
        use-service-account-credentials: true
        v: 2

# /* Configs for data encryption */
k8s_encryption-config:
  kind: EncryptionConfig
  apiVersion: v1
  resources:
    - resources:
        - secrets
      providers:
        - aescbc:
            keys:
              - name: key1
            secret: <Secret for data encryption is here!>
        - identity: {}

# /* Control plane kubeconfigs */
k8s_kubeconfigs:
  admin:
    < Insert your admin kubeconfig here! >
  '/etc/k8s/kubeconfig/kube-controller-manager.kubeconfig':
    < Insert your contoller-manager kubeconfig here! >
  '/etc/k8s/kubeconfig/kube-scheduler.kubeconfig':
    < Insert your scheduler kubeconfig here! >

It will install apiserver, kube-scheduler and control-manager pckages, put keys, certs, confiigs and kubeconfigs under specified directories and generate a systemd unit files for launching all components of the contro plane. Here is a list of generated files:

/etc/k8s
/etc/k8s/conf
/etc/k8s/conf/kube-scheduler.yaml
/etc/k8s/kubeconfig
/etc/k8s/kubeconfig/kube-scheduler.kubeconfig
/etc/k8s/kubeconfig/kube-controller-manager.kubeconfig
/etc/k8s/yamlconf
/etc/systemd/system/k8s-api.service
/etc/systemd/system/k8s-controller-manager.service
/etc/systemd/system/k8s-scheduler.service
/var/lib/k8s
/var/lib/k8s/k8s-api.key
/var/lib/k8s/own_ca.crt
/var/lib/k8s/service-accounts.key
/var/lib/k8s/own_ca.key
/var/lib/k8s/k8s-api.crt
/var/lib/k8s/encryption-config.yaml
/var/lib/k8s/service-accounts.crt

Additional note: after initial deployment, you have to perform the followinf command in order to grant cluster-admin rol eto your admin user:

/opt/k8s/kubectl create clusterrolebinding root-cluster-admin-binding --clusterrole=cluster-admin --user=admin