ansible-centos7-kubespray

Ansible playbook to configure prerequisites for Kubespray on CentOS7

Prerequisites for the CentOS7 machines:

• SSH access using password with a user who has root permissions (centos in example)
• A public key generated on your local machine

This playbook will:

• Update packages
• Install network tools
• Install and configure ntpd
• disable firewall
• disable swap
• enable passwordless sudo
• enable passwordless SSH
• set hostname

Add the IP's of your CentOS7 servers in the hosts.ini.

[all]
node1 ansible_host=192.168.140.101
node2 ansible_host=192.168.140.102
node3 ansible_host=192.168.140.103

Start the playbook. Define variables like root password, user, group and path to the public key.

$ ansible-playbook -i hosts.ini -u centos -k playbook.yml --extra-vars "ansible_sudo_pass=supersecret  user=centos group=centos pubkeypath=~/.ssh/id_rsa.pub"

After running the playbook you can start with Kubespray:

$ git clone https://github.com/kubernetes-incubator/kubespray
$ cd kubespray
$ git checkout v2.7.0

Follow the instructions described in the README.md

# Install dependencies from ``requirements.txt``
$ sudo pip install -r requirements.txt

# Copy inventory/sample as inventory/mycluster
$ cp -rfp inventory/sample inventory/mycluster

# Update Ansible inventory file with inventory builder
$ declare -a IPS=(192.168.140.101 192.168.140.102 192.168.140.103)
$ CONFIG_FILE=inventory/mycluster/hosts.ini python3 contrib/inventory_builder/inventory.py ${IPS[@]}

# Review and change parameters under inventory/mycluster/group_var
$ cat inventory/mycluster/group_vars/all.yml
$ cat inventory/mycluster/group_vars/k8s-cluster.yml
# Optional: modify the hosts.ini file to your needs.
$ vi inventory/mycluster/hosts.ini
[all]
node1   ansible_host=192.168.140.101 ip=192.168.140.101
node2   ansible_host=192.168.140.102 ip=192.168.140.102
node3   ansible_host=192.168.140.103 ip=192.168.140.103
# possible to add additional masters
[kube-master]
node1
[kube-node]
node2
node3
# possible to add additional etcd's
[etcd]
node1
[k8s-cluster:children]
kube-node
kube-master
[calico-rr]
[vault]
node1
node2
node3

Deploy Kubespray with Ansible Playbook.

$ ansible-playbook -u centos -b -i inventory/mycluster/hosts.ini cluster.yml

More details and configuration can be found here.