Kubernetes installation

Ubuntu 22.04

System preparation

Updrage

sudo apt update
sudo apt upgrade
do-release-update

Mount data disk

mkfs.xfs /dev/vdb
lsof /var
mv /var/ /var0
mkdir /mnt/newvar/
mount /dev/vdb /mnt/newvar/
rsync -aqxP /var0/* /mnt/newvar/
umount /mnt/newvar
mkdir /var
mount /dev/vdb /var

vim /etc/fstab
# /dev/vdb /var xfs  defaults 0 0

System configuration

hostnamectl set-hostname master.xx.com

cat <<EOF | sudo tee /etc/modules-load.d/k8s.conf
overlay
br_netfilter
EOF

sudo modprobe overlay
sudo modprobe br_netfilter

# sysctl params required by setup, params persist across reboots
cat <<EOF | sudo tee /etc/sysctl.d/k8s.conf
net.bridge.bridge-nf-call-iptables  = 1
net.bridge.bridge-nf-call-ip6tables = 1
net.ipv4.ip_forward                 = 1
EOF

# Apply sysctl params without reboot
sudo sysctl --system

Verify:

root@vm10-19-30-61:~# lsmod | grep br_netfilter
br_netfilter           32768  0
bridge                307200  1 br_netfilter
root@vm10-19-30-61:~# lsmod | grep overlay
overlay               151552  0
root@vm10-19-30-61:~# sysctl net.bridge.bridge-nf-call-iptables net.bridge.bridge-nf-call-ip6tables net.ipv4.ip_forward
net.bridge.bridge-nf-call-iptables = 1
net.bridge.bridge-nf-call-ip6tables = 1
net.ipv4.ip_forward = 1

Disable swap

# check if swap is disabled
swapon -s

Install Kubernetes

Containerd runtime

# Add Docker's official GPG key:
sudo apt-get update
sudo apt-get install ca-certificates curl
sudo install -m 0755 -d /etc/apt/keyrings
sudo curl -fsSL https://download.docker.com/linux/ubuntu/gpg -o /etc/apt/keyrings/docker.asc
sudo chmod a+r /etc/apt/keyrings/docker.asc



# Add the repository to Apt sources:
echo \
  "deb [arch=$(dpkg --print-architecture) signed-by=/etc/apt/keyrings/docker.asc] https://download.docker.com/linux/ubuntu \
  $(. /etc/os-release && echo "$VERSION_CODENAME") stable" | \
  sudo tee /etc/apt/sources.list.d/docker.list > /dev/null

# Use mirror instead:
curl -fsSL https://download.docker.com/linux/ubuntu/gpg | gpg --dearmor -o /etc/apt/keyrings/docker.gpg
sudo chmod a+r /etc/apt/keyrings/docker.asc
echo \
  "deb [arch=$(dpkg --print-architecture) signed-by=/etc/apt/keyrings/docker.gpg] https://mirrors.tuna.tsinghua.edu.cn/docker-ce/linux/ubuntu \
  "$(. /etc/os-release && echo "$VERSION_CODENAME")" stable" | \
  tee /etc/apt/sources.list.d/docker.list > /dev/null

sudo apt-get update

sudo apt-get install docker-ce docker-ce-cli containerd.io docker-buildx-plugin docker-compose-plugin

sudo usermod -aG docker $USER
sudo systemctl enable docker.service
sudo systemctl enable containerd.service

Generate containerd config using systemd:

sudo containerd config default | sudo tee /etc/containerd/config.toml

And modify it:

[plugins."io.containerd.grpc.v1.cri".containerd.runtimes.runc]
  ...
  [plugins."io.containerd.grpc.v1.cri".containerd.runtimes.runc.options]
    SystemdCgroup = true

sandbox_image = "registry.aliyuncs.com/google_containers/pause:3.6"

Restart the service:

sudo systemctl restart containerd

Install Kubeadm

sudo apt-get install -y apt-transport-https ca-certificates curl gpg
curl -fsSL https://pkgs.k8s.io/core:/stable:/v1.29/deb/Release.key | sudo gpg --dearmor -o /etc/apt/keyrings/kubernetes-apt-keyring.gpg

echo 'deb [signed-by=/etc/apt/keyrings/kubernetes-apt-keyring.gpg] https://pkgs.k8s.io/core:/stable:/v1.29/deb/ /' | sudo tee /etc/apt/sources.list.d/kubernetes.list

sudo apt-get update
sudo apt-get install -y kubelet kubeadm kubectl
sudo apt-mark hold kubelet kubeadm kubectl

(Optional) Configure docker/containerd proxy

proxy server:

docker:

sudo mkdir -p /etc/systemd/system/docker.service.d
vim /etc/systemd/system/docker.service.d/http-proxy.conf

# Must configure HTTPS_PROXY
[Service]
Environment="HTTP_PROXY=http://user:password@riguz.com:8080/"
Environment="HTTPS_PROXY=http://user:password@riguz.com:8080/"

Also create /etc/systemd/system/containerd.service.d/http-proxy.conf with same content. Must restart the servecie:

sudo systemctl daemon-reload
sudo systemctl restart docker
sudo systemctl restart containerd

systemctl show --property=Environment docker

(Master) Create cluster

sudo systemctl start kubelet
sudo systemctl enable kubelet

MASTER_IP="10.19.30.61"
NODENAME=$(hostname -s)
POD_CIDR="192.168.0.0/16"
KUBERNETES_VERSION="v1.29.3"

kubeadm init \
  --pod-network-cidr=$POD_CIDR \
  --apiserver-advertise-address $MASTER_IP \
  --node-name $NODENAME

It takes long time to pull images, so we can pull images first:

kubeadm config images list
kubeadm config images pull

to view images in local host:

ctr -n k8s.io images list

(Optional) Dump and import images

kubeadm config images list

# download images in a server:
sudo ctr images pull registry.k8s.io/kube-apiserver:v1.29.3
sudo ctr images pull registry.k8s.io/kube-controller-manager:v1.29.3
sudo ctr images pull registry.k8s.io/kube-scheduler:v1.29.3
sudo ctr images pull registry.k8s.io/kube-proxy:v1.29.3
sudo ctr images pull registry.k8s.io/coredns/coredns:v1.11.1
sudo ctr images pull registry.k8s.io/pause:3.9
sudo ctr images pull registry.k8s.io/etcd:3.5.12-0

# export
sudo ctr images export kubeadm-1.29.3-images.tar registry.k8s.io/kube-apiserver:v1.29.3 registry.k8s.io/kube-controller-manager:v1.29.3 registry.k8s.io/kube-scheduler:v1.29.3 registry.k8s.io/kube-proxy:v1.29.3 registry.k8s.io/coredns/coredns:v1.11.1 registry.k8s.io/pause:3.9 registry.k8s.io/etcd:3.5.12-0

# import
ctr -n k8s.io images import kubeadm-1.29.3-images.tar

# Verify all images has been pulled:
kubeadm config images pull
W0410 16:58:19.699693  323494 version.go:104] could not fetch a Kubernetes version from the internet: unable to get URL "https://dl.k8s.io/release/stable-1.txt": Get "https://cdn.dl.k8s.io/release/stable-1.txt": dial tcp 151.101.89.55:443: i/o timeout (Client.Timeout exceeded while awaiting headers)
W0410 16:58:19.699757  323494 version.go:105] falling back to the local client version: v1.29.3
[config/images] Pulled registry.k8s.io/kube-apiserver:v1.29.3
[config/images] Pulled registry.k8s.io/kube-controller-manager:v1.29.3
[config/images] Pulled registry.k8s.io/kube-scheduler:v1.29.3
[config/images] Pulled registry.k8s.io/kube-proxy:v1.29.3
[config/images] Pulled registry.k8s.io/coredns/coredns:v1.11.1
[config/images] Pulled registry.k8s.io/pause:3.9
[config/images] Pulled registry.k8s.io/etcd:3.5.12-0

Generate config

# non-root user
mkdir -p $HOME/.kube
sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
sudo chown $(id -u):$(id -g) $HOME/.kube/config

# root
export KUBECONFIG=/etc/kubernetes/admin.conf

Install CNI plugin

kubectl create -f https://raw.githubusercontent.com/projectcalico/calico/v3.27.3/manifests/tigera-operator.yaml
kubectl create -f https://raw.githubusercontent.com/projectcalico/calico/v3.27.3/manifests/custom-resources.yaml

watch kubectl get pods -n calico-system

NAME                                      READY   STATUS    RESTARTS   AGE
calico-kube-controllers-7bc6b5bb8-5dnsf   1/1     Running   0          26m
calico-node-jdw2v                         1/1     Running   0          26m
calico-typha-5c754949c6-qhfwz             1/1     Running   0          26m
csi-node-driver-9wmmd                     2/2     Running   0          26m

By default, your cluster will not schedule Pods on the control plane nodes for security reasons. If you want to be able to schedule Pods on the control plane nodes:

kubectl taint nodes --all node-role.kubernetes.io/master-

To dump images:

sudo ctr images pull docker.io/calico/apiserver:v3.27.3
sudo ctr images pull docker.io/calico/cni:v3.27.3
sudo ctr images pull docker.io/calico/csi:v3.27.3
sudo ctr images pull docker.io/calico/kube-controllers:v3.27.3
sudo ctr images pull docker.io/calico/node-driver-registrar:v3.27.3
sudo ctr images pull docker.io/calico/node:v3.27.3
sudo ctr images pull docker.io/calico/pod2daemon-flexvol:v3.27.3
sudo ctr images pull docker.io/calico/typha:v3.27.3
sudo ctr images pull quay.io/tigera/operator:v1.32.7

sudo ctr images export calico-3.27.3.tar docker.io/calico/apiserver:v3.27.3 docker.io/calico/cni:v3.27.3 docker.io/calico/csi:v3.27.3 docker.io/calico/kube-controllers:v3.27.3 docker.io/calico/node-driver-registrar:v3.27.3 docker.io/calico/node:v3.27.3 docker.io/calico/pod2daemon-flexvol:v3.27.3 docker.io/calico/typha:v3.27.3 quay.io/tigera/operator:v1.32.7

Join nodes

kubeadm join 10.19.30.61:6443 --token xxx \
    --node-name node02 \
	--discovery-token-ca-cert-hash xxx

HELM

wget https://get.helm.sh/helm-v3.14.4-linux-amd64.tar.gz
tar -zxvf helm-v3.14.4-linux-amd64.tar.gz
install linux-amd64/helm /usr/local/bin/helm

NFS

apt install nfs-common

# try to mount it
mount -t nfs -o vers=3,nolock,proto=tcp,noresvport 10.19.31.01:/cfs-xxx /mnt/tmpnfs