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Ansible Role: Kubernetes

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Introduction

An Ansible Role that installs Kubernetes on Linux.

Requirements

  • Docker; recommended role for Docker installation: geerlingguy.docker.
  • Loadbalancer or keepalived for HA; recommended role for keepalived installations: evrardjp.keepalived

Dependencies

  • Python library Docker

Variables

Common

Name Default Describtion
kubernetes_cluster_name "kubernetes" kubernetes cluster name
kubernetes_master_version "v1.13.2" This is the version of the kubernetes master components
kubernetes_version_rhel_package '1.13.2' only redhat, version of kubectl,kubeadm,kubelet
kubernetes_yum_arch x86_64 only redhat
kubernetes_apt_repo_url http://apt.kubernetes.io/ only debian, kubernetes repository
kubernetes_apt_repo_pool kubernetes-xenial only debian, kubernetes repository pool
kubernetes_useHyperKubeImage "false" switch to change control-plane docker image to hyperkube
kubernetes_dns_type "CoreDNS" dns plugin in kubernetes, could be: "kube-dns" or "CoreDNS"
kubernetes_imageRepository "k8s.gcr.io" docker registry for kubernetes master components
kubernetes_config_dir "/etc/kubernetes" Config path
kubernetes_certs_dir "{{ kubernetes_config_dir }}/pki" certs folder
kubernetes_pod_manifest_path Absoulte path where static pod manifests will be stored "{{ kubernetes_config_dir }}/manifests"
kubernetes_log_dir "{{ kubernetes_log_dir }}/audit" log folder
kubernetes_audit_log_dir "/var/log/kubernetes/audit" audit log folder
kubernetes_log_age 2 max age of logfiles
kubernetes_authorization_mode "Node,RBAC" kubernetes authorization mode
kubernetes_enable_admission_plugins "Initializers,NamespaceLifecycle,LimitRanger,ServiceAccount,DefaultStorageClass,DefaultTolerationSeconds,NodeRestriction,MutatingAdmissionWebhook,ValidatingAdmissionWebhook,ResourceQuota" kubernetes enabled admission plugins
kubernetes_dns_domain "cluster.local" internal dns domain in kubernetes cluster
kubernetes_pod_subnet "10.244.0.0/16" ipv4 subnet for pods, must be a cidr
kubernetes_service_subnet "10.96.0.0/16" ipv4 subnet vor service, must be a cidr
kubernetes_kubelet_extra_args "" extra arguments for the kubelet daemon
kubernetes_packages false - name: kubelet
state: present
- name: kubectl
state: present
- name: kubeadm
state: present
- name: kubernetes-cni
state: present
kubernetes_version_kubeadm 'stable-{{ kubernetes_version }}' version of kubeadm

API server

Name Default Describtion
kubernetes_apiserver_dns "" dns-name for kubernetes apiserver
kubernetes_apiserver_ip - virtual ip of kubernetes apiserver loadbalancer
kubernetes_apiserver_port 6443 port of kubernetes apiserver
kubernetes_apiserver_manifest_file '{{ kubernetes_pod_manifest_path }}/kube-apiserver.yaml' Absolute path to manifest file

Etcd

Name Description Default
kubernetes_etcd_certs_dir Path to store Etcd certificates '{{ kubernetes_certs_dir }}/etcd'
kubernetes_etcd_ca_cert_file Etcd root CA certificate file '{{ kubernetes_etcd_certs_dir }}/ca.crt'
kubernetes_etcd_ca_key_file Etcd root CA key file '{{ kubernetes_etcd_certs_dir }}/ca.key'
kubernetes_etcd_server_cert_file Etcd server certificate file '{{ kubernetes_etcd_certs_dir }}/server.crt'
kubernetes_etcd_server_key_file Etcd server key file '{{ kubernetes_etcd_certs_dir }}/server.key'
kubernetes_etcd_peer_cert_file '{{ kubernetes_etcd_certs_dir }}/peer.crt'
kubernetes_etcd_peer_key_file '{{ kubernetes_etcd_certs_dir }}/peer.key'
kubernetes_etcd_healthcheck_client_cert_file '{{ kubernetes_etcd_certs_dir }}/healthcheck-client.crt'
kubernetes_etcd_healthcheck_client_key_file '{{ kubernetes_etcd_certs_dir }}/healthcheck-client.key'
kubernetes_etcd_apiserver_client_cert_file '{{ kubernetes_certs_dir }}/apiserver-etcd-client.crt'
kubernetes_etcd_apiserver_client_key_file '{{ kubernetes_certs_dir }}/apiserver-etcd-client.key'
kubernetes_etcd_manifest_file '{{ kubernetes_pod_manifest_path }}/etcd.yaml'
kubernetes_etcd_data_dir folder for etcd data /var/etcd
kubernetes_etcd_server_port Etcd server communication port 2380
kubernetes_etcd_client_port Etcd client communication port 2379

Controller Manager

Name Description Default
kubernetes_controller_manager_manifest_file Absolute path to manifest file '{{ kubernetes_pod_manifest_path }}/kube-controller-manager.yaml'

kubeadm

Name Description Default
kubernetes_kubeadm_config_file_path Path to store kubeadm config file '{{ kubernetes_config_dir }}/kubeadm'
kubernetes_kubeadm_config_file_name Name of kubeadm config file clusterconfig.yaml

Scheduler

Name Description Default
kubernetes_scheduler_manifest_file Absolute path to manifest file '{{ kubernetes_pod_manifest_path }}/kube-scheduler.yaml'

Cloud Provider

Name Description Default
kubernetes_cloud_provider choose supported cloudprovider, values: "" or "vsphere" ""
kubernetes_cloud_config_file path for cloud_config file "{{ kubernetes_config_dir }}/{{ kubernetes_cloud_provider }}.conf"
kubernetes_cloud_vsphere_workspace_server option server in area [workspace] of the cloud_config (only vsphere) ""
kubernetes_cloud_vsphere_workspace_datacenter option datacenter in area [workspace] of the cloud_config (only vsphere) ""
kubernetes_cloud_vsphere_workspace_default_datastore option default_datastore in area [workspace] of the cloud_config (only vsphere) ""
kubernetes_cloud_vsphere_workspace_folder option folder in area [workspace] of the cloud_config (only vsphere) ""
kubernetes_cloud_vsphere_default_user option user in the area [global] of the cloud_config (only vsphere) ""
kubernetes_cloud_vsphere_default_password option password in the area [global] of the cloud_config (only vsphere) ""
kubernetes_cloud_vsphere_datacenters list of datacenters with the attributes: server,datatcenters,username,password of the cloud_config (only vsphere) []
kubernetes_cloud_vsphere_network_options all options in the area [network] of the cloud_config (only vsphere) []
kubernetes_cloud_vsphere_disk_options all options in the area [disk] of the cloud_config (only vsphere) []

Example Playbooks

There is an Vagrantfile to create all servers for all szenarios: Vagrantfile servers.yml (needed for Vagrantfile)

AllinOne

inventory

site.yml

Single Master-Cluster

inventory

site.yml

seperated etcd, single Master Cluster

inventory

site.yml

HA-Master-Cluster

inventory

site.yml

seperated etcd, HA Master Cluster

inventory

site.yml

License

Apache 2.0

Contributors

Author Information

created in 2018 by André Möller