Create Cluster Kubernetes – On Premises

Can be deployed on KVM, VirtualBox, VMware or OpenStack

Supported Linux Distributions

  • CentOS/RHEL 7
  • Ubuntu 16

Installation

To deploy the cluster you can use:

  • Ansible 2.6.1
  • Python version 2.7.12

Supported Components

  • etcd v3.3.8
  • docker 18.06.0-ce
  • keepalived v1.3.5
  • kubernetes v1.11.1
  • weave v2.4.0

Clone project

git clone https://github.com/vandocouto/cluster-kubernetes-on-premises.git

Step 1 – Configure file vars/main.yml

  • Set the environment variables
# certificate cfssl -SSL
expiry: 24000h
corp: corporation
cfssl: /etc/cfssl

# ips (do not change)
ips-etcd: "{{groups['etcd']|join(',')}}"
ips-master: "{{groups['master']|join(',')}}"
ips-worker: "{{groups['worker']|join(',')}}"

# kubernetes
k8sversionUbuntu: 1.11.1-00
k8sversionRedhat: 1.11.1-0*
podSubnet: 10.0.0.0/16
# NOTE: create TOKEN - run command
# python -c 'import random; print "%0x.%0x" % (random.SystemRandom().getrandbits(3*8), random.SystemRandom().getrandbits(
  #8*8))'
admission_token: 3e6035.191009b3012b14db

# etcd
etcdversion: v3.3.8
etcd: /etc/etcd
etcdstorage: /var/lib/etcd-cluster

# NOTE: Configure keepalived
interfacename: enp0s3
# Default
priority: 51
keeppass: p7S5gkT719R
state: MASTER
# IP VIP
virtualip: 192.168.56.200

Step 2 – Inventory

  • open file hosts
  • add ips or fqdn to etcd, master and worker.
    • number minimum: 3 nodes for etcd
    • number minimum: 2 nodes for master
    • number minimum: 1 node for worker

Example:

[etcd]
192.168.56.111
192.168.56.112
192.168.56.113

[master]
192.168.56.111
192.168.56.112
192.168.56.113

[worker]
192.168.56.114
192.168.56.115

[all:vars]
ansible_ssh_user=administrator
ansible_ssh_private_key_file=~/kubernetes.pem

Step 3 – Executing playbook Ansible

ANSIBLE_HOST_KEY_CHECKING=False ansible-playbook -i hosts ./tasks/main.yml --skip-tags destroyCluster

Display Dashboard Kubernetes

http://IP-VIP:30000

Dashboard Kubernetes

Display Weave Scope

http://IP-VIP:30001

Weave Scope

NOTE:

Destroy Cluster Kubernetes

ANSIBLE_HOST_KEY_CHECKING=False ansible-playbook -i hosts ./tasks/main.yml --tags destroyCluster