Notes for setting up a kubernetes cluster using kubeadm
MAC addresses must be unique for each node:
ifconfig -a
Product UUID must be unique for each node:
sudo cat /sys/class/dmi/id/product_uuid
These two pieces of information are used to provide identity to each node automagically.
The following default port assignments are used by kubernetes:
- Master: 6443, 2379, 2380, 10250, 10251, 10252, 10255
- Node: 10250, 10255, 30000-32767
Install docker:
apt-get update
apt-get install -y apt-transport-https ca-certificates curl software-properties-common
curl -fsSL https://download.docker.com/linux/ubuntu/gpg | apt-key add -
add-apt-repository "deb https://download.docker.com/linux/$(. /etc/os-release; echo "$ID") $(lsb_release -cs) stable"
apt-get update
apt-get install -y docker-ce=$(apt-cache madison docker-ce | grep 17.03 | head -1 | awk '{print $3}')
Install kubeadm, kubelet, kubectl:
apt-get update
apt-get install -y apt-transport-https curl
curl -s https://packages.cloud.google.com/apt/doc/apt-key.gpg | apt-key add -
cat <<EOF >/etc/apt/sources.list.d/kubernetes.list
deb http://apt.kubernetes.io/ kubernetes-xenial main
EOF
apt-get update
apt-get install -y kubelet kubeadm kubectl
Your docker cgroup driver must match your kubeadm config:
docker info | grep -i cgroup
cat /etc/systemd/system/kubelet.service.d/10-kubeadm.conf
At the moment, kubelet is not even configured to use cgroup... maybe it defaults to cgroupfs?
Current status of kubelet is that it failed to start because /etc/kubernetes/pki/ca.crt does not exist.
We move on...
Initialize the master:
kubeadm init
This fails out of the gate due to preflight checks:
- WARNING: crictl not found in system path
- ERROR: running with swap on is not supported, disable swap