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Bootstrap a Kubernetes cluster that can run both Linux and Windows workloads on Google Cloud.

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Heterogeneous Kubernetes cluster on top of OVN

Author: Paulo Pires [email protected]

This document describes, step-by-step, how to provision a Kubernetes cluster comprised of:

  • One Linux machine acting as Kubernetes master node and OVN central database.
  • One Linux machine acting as Kubernetes worker node.
  • One Windows machine acting as Kubernetes worker node.

Many thanks to the great people that helped achieve this, namely:

  • Alin Serdean (Cloudbase Solutions)
  • Alin Balutoiu (Cloudbase Solutions)
  • Feng Min (Google)
  • Peter Hornyack (Google)

Requirements

  • Use Google Cloud Platform (GCP) , namely Google Compute Engine (GCE) VMs.
    • gcloud CLI tool
  • Linux machines(s) run Ubuntu 16.04 with latest updates.
  • Windows machine(s) run Windows Server 2016 with latest updates.
  • Administrator access to all VMs, i.e. root in Linux machines.

Master (Linux)

Node set-up

Let's provision the master VM:

gcloud compute instances create "sig-windows-master" \
    --zone "us-east1-d" \
    --machine-type "custom-2-2048" \
    --subnet "default" \
    --can-ip-forward \
    --maintenance-policy "MIGRATE" \
    --tags "http-server","https-server" \
    --image "ubuntu-1604-xenial-v20170125" \
    --image-project "ubuntu-os-cloud" \
    --boot-disk-size "50" \
    --boot-disk-type "pd-ssd" \
    --boot-disk-device-name "sig-windows-master"

When it's ready, SSH into it:

gcloud compute ssh --zone "us-east1-d" "sig-windows-master"

ATTENTION: From now on, it's assumed you're logged-in as root.

Since we'll need Docker, let's install it:

curl -fsSL https://yum.dockerproject.org/gpg | apt-key add -
echo "deb https://apt.dockerproject.org/repo ubuntu-xenial main" > sudo tee /etc/apt/sources.list.d/docker.list

apt-get update
apt-get install -y docker.io

We also need to download the contents of this repository which will be used shortly:

cd ~
git clone https://github.com/apprenda/kubernetes-ovn-heterogeneous-cluster
cd kubernetes-ovn-heterogeneous-cluster/deb

dpkg -i openvswitch-common_2.6.2-1_amd64.deb \
openvswitch-datapath-dkms_2.6.2-1_all.deb \
openvswitch-switch_2.6.2-1_amd64.deb \
ovn-common_2.6.2-1_amd64.deb \
ovn-central_2.6.2-1_amd64.deb \
ovn-docker_2.6.2-1_amd64.deb \
ovn-host_2.6.2-1_amd64.deb \
python-openvswitch_2.6.2-1_all.deb

Finally, reboot:

reboot

SSH again into the machine and let's proceed.

TODO is this still needed after the reboot?

rmmod openvswitch
insmod /lib/modules/$(uname -r)/updates/dkms/openvswitch.ko
modprobe vport-geneve

Create the OVS bridge interface:

ovs-vsctl add-br br-int

export TUNNEL_MODE=geneve
export LOCAL_IP=10.142.0.2
export MASTER_IP=10.142.0.2 

ovs-vsctl set Open_vSwitch . external_ids:ovn-remote="tcp:$MASTER_IP:6642" \
  external_ids:ovn-nb="tcp:$MASTER_IP:6641" \
  external_ids:ovn-encap-ip="$LOCAL_IP" \
  external_ids:ovn-encap-type="$TUNNEL_MODE"

ovs-vsctl get Open_vSwitch . external_ids

You should see something like:

{hostname=sig-windows-master.c.apprenda-project-one.internal, "k8s-api-server"="127.0.0.1:8080", ovn-encap-ip="10.142.0.2", ovn-encap-type=geneve, ovn-nb="tcp:10.142.0.2:6641", ovn-remote="tcp:10.142.0.2:6642", system-id="e7af27f6-a218-40bb-8d4f-af67600abd17"}

We are now ready to set-up Kubernetes master node.

Kubernetes set-up

ATTENTION: From now on, it's assumed you're logged-in as root.

First, we need to run etcd, the store used by Kubernetes. The following is a one-time step only:

cd ~/kubernetes-ovn-heterogeneous-cluster/master
cp -R systemd/*.service /etc/systemd/system/
systemctl daemon-reload
systemctl enable etcd3
systemctl start etcd3

Then, proceed to set-up Kubernetes:

./make-certs

mkdir -p /etc/kubernetes
cp -R manifests /etc/kubernetes/

systemctl enable kubelet
systemctl start kubelet

curl -Lskj -o /usr/bin/kubectl https://storage.googleapis.com/kubernetes-release/release/v1.5.2/bin/linux/amd64/kubectl
chmod +x /usr/bin/kubectl

kubectl config set-cluster default-cluster --server=https://10.142.0.2 --certificate-authority=/etc/kubernetes/tls/ca.pem
kubectl config set-credentials default-admin --certificate-authority=/etc/kubernetes/tls/ca.pem --client-key=/etc/kubernetes/tls/admin-key.pem --client-certificate=/etc/kubernetes/tls/admin.pem
kubectl config set-context local --cluster=default-cluster --user=default-admin
kubectl config use-context local

kubectl create -f ../kubedns-deployment.yaml
kubectl create -f ../kubedns-service.yaml

Last step is to configure pod networking for this node:

ovs-vsctl set Open_vSwitch . external_ids:k8s-api-server="127.0.0.1:8080"

apt-get install -y python-pip
cd ~
git clone https://github.com/openvswitch/ovn-kubernetes
cd ovn-kubernetes
pip install --prefix=/usr/local .

ovn-k8s-overlay master-init \
  --cluster-ip-subnet="10.244.0.0/16" \
  --master-switch-subnet="10.244.1.0/24" \
  --node-name="10.142.0.2"

systemctl enable ovn-k8s-watcher
systemctl start ovn-k8s-watcher

By this time, your master node is ready:

kubectl get nodes
kubectl -n kube-system get pods

Let's proceed to set-up the worker nodes.

Worker (Linux)

Node set-up

Let's provision the master VM:

gcloud compute instances create "sig-windows-worker-linux" \
    --zone "us-east1-d" \
    --machine-type "custom-2-2048" \
    --subnet "default" \
    --can-ip-forward \
    --maintenance-policy "MIGRATE" \
    --image "ubuntu-1604-xenial-v20170125" \
    --image-project "ubuntu-os-cloud" \
    --boot-disk-size "50" \
    --boot-disk-type "pd-ssd" \
    --boot-disk-device-name "sig-windows-worker-linux"

When it's ready, SSH into it:

gcloud compute ssh --zone "us-east1-d" "sig-windows-worker-linux"

ATTENTION: From now on, it's assumed you're logged-in as root.

Since we'll need Docker, let's install it:

curl -fsSL https://yum.dockerproject.org/gpg | apt-key add -
echo "deb https://apt.dockerproject.org/repo ubuntu-xenial main" > sudo tee /etc/apt/sources.list.d/docker.list

apt-get update
apt-get install -y docker.io

We also need to download the contents of this repository which will be used shortly:

cd ~
git clone https://github.com/apprenda/kubernetes-ovn-heterogeneous-cluster
cd kubernetes-ovn-heterogeneous-cluster/deb

dpkg -i openvswitch-common_2.6.2-1_amd64.deb \
openvswitch-datapath-dkms_2.6.2-1_all.deb \
openvswitch-switch_2.6.2-1_amd64.deb \
ovn-common_2.6.2-1_amd64.deb \
ovn-central_2.6.2-1_amd64.deb \
ovn-docker_2.6.2-1_amd64.deb \
ovn-host_2.6.2-1_amd64.deb \
python-openvswitch_2.6.2-1_all.deb

Finally, reboot:

reboot

SSH again into the machine and let's proceed.

TODO is this still needed after the reboot?

rmmod openvswitch
insmod /lib/modules/$(uname -r)/updates/dkms/openvswitch.ko
modprobe vport-geneve

Create the OVS bridge interface:

ovs-vsctl add-br br-int

export TUNNEL_MODE=geneve
export LOCAL_IP=10.142.0.3
export MASTER_IP=10.142.0.2

ovs-vsctl set Open_vSwitch . external_ids:ovn-remote="tcp:$MASTER_IP:6642" \
  external_ids:ovn-nb="tcp:$MASTER_IP:6641" \
  external_ids:ovn-encap-ip="$LOCAL_IP" \
  external_ids:ovn-encap-type="$TUNNEL_MODE"

ovs-vsctl get Open_vSwitch . external_ids

Then, proceed to set-up Kubernetes:

cd ~/kubernetes-ovn-heterogeneous-cluster/node

# TODO copy the two CA files below from master
chmod 600 /etc/kubernetes/tls/ca-key.pem
chmod 660 /etc/kubernetes/tls/ca.pem
chgrp kube-cert /etc/kubernetes/*

./linux-make-certs

mkdir -p /etc/kubernetes
cp -R manifests /etc/kubernetes/

cp kubeconfig.yaml /etc/kubernetes/

cp -R systemd/*.service /etc/systemd/system/
systemctl daemon-reload
systemctl enable kubelet
systemctl start kubelet
ovs-vsctl set Open_vSwitch . external_ids:k8s-api-server="10.142.0.2:8080"

ovs-vsctl set Open_vSwitch . \
  external_ids:k8s-api-server="https://10.142.0.2" \
  external_ids:k8s-ca-certificate="/etc/kubernetes/tls/ca.pem" \
  external_ids:k8s-api-token="/etc/kubernetes/tls/node.pem"

mkdir -p /opt/cni/bin && cd /opt/cni/bin
curl -Lskj -o cni.tar.gz https://github.com/containernetworking/cni/releases/download/v0.4.0/cni-v0.4.0.tgz
tar zxf cni.tar.gz
rm -f cni.tar.gz

apt-get install -y python-pip
git clone https://github.com/openvswitch/ovn-kubernetes
cd ovn-kubernetes
pip install --prefix=/usr/local .

ovn-k8s-overlay minion-init \
  --cluster-ip-subnet="10.244.0.0/16" \
  --minion-switch-subnet="10.244.2.0/24" \
  --node-name="10.142.0.3"

By this time, your Linux worker node is ready:

kubectl get nodes
kubectl -n kube-system get pods

Let's proceed to setup the Windows worker node.

Worker (Windows)

TODO

(Optional) Build packages

OVS/OVN

As root, run:

apt-get update
apt-get install -y build-essential fakeroot dkms \
autoconf automake debhelper dh-autoreconf libssl-dev libtool \
python-all python-twisted-conch python-zopeinterface \
graphviz

cd ~
git clone https://github.com/openvswitch/ovs.git
cd ovs
git checkout branch-2.6

dpkg-checkbuilddeps

DEB_BUILD_OPTIONS='nocheck' fakeroot debian/rules binary

TODO

  • Copy CA files from master.
  • etcd container should use a host path for storing data, in order to survive restarts.
  • Linux worker node doesn't need the same OVS/OVN packages installed as the master node.
  • Automate certificate generation based on node type and IP.
  • Template all the things.
  • Add other cloud providers documentation, e.g. AWS.
  • Add gateway node instructions for enabling pod containers Internet access.
  • Setup OVS TLS.

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Bootstrap a Kubernetes cluster that can run both Linux and Windows workloads on Google Cloud.

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