ubuntu-vagrant

Ubuntu vms with kubernetes installed. provisioned by ansible!

How to use Vagrant version

#cache apt-get, apt-list and pip. this plugin will save a lot of time while provisioning your machines
$ vagrant plugin install vagrant-cachier

$ sudo ansible-galaxy install geerlingguy.git angstwad.docker_ubuntu

$ vagrant up
# watch vagrant-cachier and feel like WTF
# while :; do clear; tree ~/.vagrant.d/cache/ubuntu/trusty64/apt/; sleep 2; done

How to use VMs already created

If you have your VMs already created, the only thing you need to do is execute ansible/playbook.yml against your machines (VMs) it can be Ubuntu 14.04/16.04.

• prepare your inventory file like

master-10.9.8.7 ansible_ssh_host={host} ansible_ssh_port={port} ansible_ssh_user='{user}' ansible_ssh_private_key_file='{private_key}'
worker-10.9.8.51 ansible_ssh_host={host} ansible_ssh_port={port} ansible_ssh_user='{user}' ansible_ssh_private_key_file='{private_key}'

[masters]
master-10.9.8.[5:10]

[workers]
worker-10.9.8.[50:100]

• run ansible against your machines

# extra-vars should has your master_ip
$ ansible-playbook --connection=ssh --timeout=30 --inventory-file={inventory-file} --extra-vars="{\"master_ip\":\"10.9.8.7\",\"k8s_version\":\"v1.3.7\"}" -v ansible/playbook.yml

Kubernetes

kubernetes is deployed with ansible, you will have 4 machines master-10.9.8.7, worker-10.9.8.51-53. it will be add to cluster automatically, if not need to add this nodes to the cluster by

$ vagrant ssh master-10.9.8.7
$ kubectl get nodes
# if it not created automatically use kubectl to create each node
$ sudo cat <<EOF | kubectl create -f -
{
  "kind": "Node",
  "apiVersion": "v1",
  "metadata": {
    "name": "10.9.8.51",
    "labels": {
      "name": "node-51",
      "env": "development"
    }
  }
}
EOF

Misc

command I used to use, and forget it everytime.

$ ssh -p 2200 -i ./.vagrant/machines/master-7/virtualbox/private_key vagrant@127.0.0.1
# debug iptables, by monitoring rule packets
$ sudo iptables -L FORWARD -v
# track network interface with tcpdump
$ tcpdump -n -i flannel0
# delete iptables rule by rule_number
$ iptables -L FORWARD --line-numbers
$ iptables -D FORWARD {rule_number}
$ iptables -F FORWARD # if you like to delete all the chain of filter table (default table, can be changed with -t e.g. -t nat)