K8s for Intel Cloud

Overview

This document covers installing Kuberenets on Intel Cloud VMs. At a high level we will need to accomplish the following:

1. Create VMs - a "deploy" node, a master node and two minion nodes
2. Install pre-requisites on deploy node
3. Run playbooks to pre-configure all the nodes.
4. Install k8s
5. Install k8s add-ons (dns and dashboard)
6. Test

Create VMs

Tips

Use a naming convention.

Example: ops-deploy01, ops-km01, ops-kn01, ops-kn02

Flavor size

4x Small-A flavor VMs are sufficient for testing but YMMV depending on intended purpose.

Image

Ubuntu 14.04

Create Deploy VM

Create a VM thru Intel Cloud and name it -deploy01

Example: ops-deploy01

Create Master and Minion VMs

Create 3 VMs following your naming convention. This example uses km for master and kn for minions.

Example: ops-km01, ops-kn01, ops-kn02

Install pre-requisites on deploy node

Configure proxy

sudo /etc/environment

Add the following contents, substituting the correct node IPs:

http_proxy="http://proxy-us.intel.com:911"
https_proxy="http://proxy-us.intel.com:911"
no_proxy=".intel.com,localhost,127.0.0.1,<deploy ip>,<master ip>,<minion1 ip>,<minion2 ip>

Install ansible and passlib

# on deploy node
sudo apt-get update
sudo apt-get install -y software-properties-common python-passlib
sudo apt-add-repository ppa:ansible/ansible
sudo apt-get update
sudo apt-get install -y ansible

Create k8s user

Ansible roles are currenly wired to create and utilize user "k8s" on all master and minion nodes and expect to find id_rsa.pub in /home/k8s/.ssh on the deploy node.

# on deploy node
sudo adduser k8s
sudo usermod -aG sudo k8s
sudo su k8s
cd ~
ssh-keygen # accept defaults

Add your public key to k8s user

vi /home/k8s/.ssh/authorized_keys

Update /etc/hosts

Append your nodes and IP addresses to the hosts file. This makes it easier to ssh to nodes.

sudo vi /etc/hosts

Use ansible to configure nodes

Before we can install Kubernetes, we must run Ansible playbooks to setup things like proxy, user and docker.

Clone k8s4ic repo

git clone https://github.com/jascott1/k8s4ic.git
cd k8s4ic

Create Ansible inventory hosts

Creat a hosts file in the k8s4ic directory:

vi hosts

Add the following contents using your hostnames and IPs.
IMPORTANT: Change the ad_ user to the account that created the VMs (or at least has SSH access and sudo)

[masters]
ops-km01 ansible_host=10.64.136.100 ansible_user=ad_myidsid

[masters:vars]
ansible_ssh_private_key_file=/home/k8s/.ssh/id_rsa

[workers]
ops-kn01 ansible_host=10.64.136.101
ops-kn02 ansible_host=10.64.143.102

[workers:vars]
ansible_ssh_private_key_file=/home/k8s/.ssh/id_rsa
ansible_user=ad_myidsid

SSH Fingerprint

From deploy node, SSH to each node and accept the fingerprint.

ssh ops-km01
ssh ops-kn01
ssh ops-kn02

IMPORTANT: If you re-create master and minions, be sure to clear ~/.ssh/known_hosts or Ansible will fail to connect.

TODO automate ssh fingerprint

Run master play

Run the master playbook and enter a password to be used for the new user as well as your ad_ password twice.

ansible-playbook -i hosts playbooks/master.yml --limit=masters --ask-pass --ask-become-pass

Run worker play

Run the worker playbook and enter a password to be used for the new user (same as before) as well as your ad_ password twice.

ansible-playbook -i hosts playbooks/worker.yml --limit=workers  --ask-pass --ask-become-pass

Deploy Kubernetes

Clone Kubernets

git clone https://github.com/kubernetes/kubernetes.git

Configure Kubernetes

We must add our nodes and proxy to the config.

cd kubernetes
vi cluster/ubuntu/config.default.sh

Find the line similar to the one below and change for your user and nodes

export nodes=${nodes:-"k8s@10.64.136.104 k8s@10.64.136.111 k8s@10.64.143.105"}

Find the line similar to the one belowand change it to have dedicated server and two minions.

roles=${roles:-"a i i"}

Find the line similar to the one below and add the proxy.

IMPORTANT: Add all the nodes to the no_proxy var.

PROXY_SETTING=${PROXY_SETTING:-"http_proxy=http://proxy-us.intel.com:911 https_proxy=http://proxy-us.intel.com:911 no_proxy=.intel.com,localhost,10.64.143.105,10.64.136.100,10.64.136.101,10.64.142.102"}

Patch bug: Missing untar and copy for salt

The download-release script is missing an untar and copy commmand and kube-up.sh will fail unless the script is modified.
See ths issue for more info: kubernetes/kubernetes#30751

add untar

In cluster/ubuntu/download-release.sh add
'tar xzf kubernetes-salt.tar.gz' as below:

...
tar xzf kubernetes-server-linux-amd64.tar.gz
tar xzf kubernetes-salt.tar.gz
popd
...

add copy

and add 'cp -a kubernetes/server/kubernetes/saltbase ../' as below:

...
cp kubernetes/server/kubernetes/server/bin/kubectl binaries/
cp -a kubernetes/server/kubernetes/saltbase ../
echo ${KUBE_VERSION} > binaries/.kubernetes
...

Install Kubernetes

cd kubernetes/cluster
KUBERNETES_PROVIDER=ubuntu ./kube-up.sh

Deploy Addons (DNS and UI)

cd ubuntu
KUBERNETES_PROVIDER=ubuntu ./deployAddons.sh

Reference

Ubuntu Bar metal tutorial

http://kubernetes.io/docs/getting-started-guides/ubuntu/