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Kubernetes

Kubernetes 1.22.9 Cluster Setup Master and Worker in Ubuntu 20.04

July 13, 2022 Leave a Comment

Sample Code – https://github.com/certifications-tutorials/cks-course-environment/tree/master/cluster-setup/previous

# cks-master
sudo -i
bash <(curl -s https://raw.githubusercontent.com/killer-sh/cks-course-environment/master/cluster-setup/latest/install_master.sh)


# cks-worker
sudo -i
bash <(curl -s https://raw.githubusercontent.com/killer-sh/cks-course-environment/master/cluster-setup/latest/install_worker.sh)


# run the printed kubeadm-join-command from the master on the worker
#!/bin/sh
# Source: http://kubernetes.io/docs/getting-started-guides/kubeadm
set -e
source /etc/lsb-release
if [ "$DISTRIB_RELEASE" != "20.04" ]; then
echo "################################# "
echo "############ WARNING ############ "
echo "################################# "
echo
echo "This script only works on Ubuntu 20.04!"
echo "You're using: ${DISTRIB_DESCRIPTION}"
echo "Better ABORT with Ctrl+C. Or press any key to continue the install"
read
fi
KUBE_VERSION=1.22.9
### setup terminal
apt-get update
apt-get install -y bash-completion binutils
echo 'colorscheme ron' >> ~/.vimrc
echo 'set tabstop=2' >> ~/.vimrc
echo 'set shiftwidth=2' >> ~/.vimrc
echo 'set expandtab' >> ~/.vimrc
echo 'source <(kubectl completion bash)' >> ~/.bashrc
echo 'alias k=kubectl' >> ~/.bashrc
echo 'alias c=clear' >> ~/.bashrc
echo 'complete -F __start_kubectl k' >> ~/.bashrc
sed -i '1s/^/force_color_prompt=yes\n/' ~/.bashrc
### disable linux swap and remove any existing swap partitions
swapoff -a
sed -i '/\sswap\s/ s/^\(.*\)$/#\1/g' /etc/fstab
### remove packages
kubeadm reset -f || true
crictl rm --force $(crictl ps -a -q) || true
apt-mark unhold kubelet kubeadm kubectl kubernetes-cni || true
apt-get remove -y docker.io containerd kubelet kubeadm kubectl kubernetes-cni || true
apt-get autoremove -y
systemctl daemon-reload
### install podman
. /etc/os-release
echo "deb https://download.opensuse.org/repositories/devel:/kubic:/libcontainers:/testing/xUbuntu_${VERSION_ID}/ /" | sudo tee /etc/apt/sources.list.d/devel:kubic:libcontainers:testing.list
curl -L "https://download.opensuse.org/repositories/devel:/kubic:/libcontainers:/testing/xUbuntu_${VERSION_ID}/Release.key" | sudo apt-key add -
apt-get update -qq
apt-get -qq -y install podman cri-tools containers-common
rm /etc/apt/sources.list.d/devel:kubic:libcontainers:testing.list
cat <<EOF | sudo tee /etc/containers/registries.conf
[registries.search]
registries = ['docker.io']
EOF
### install packages
curl https://packages.cloud.google.com/apt/doc/apt-key.gpg | apt-key add -
cat <<EOF > /etc/apt/sources.list.d/kubernetes.list
deb http://apt.kubernetes.io/ kubernetes-xenial main
EOF
apt-get update
apt-get install -y docker.io containerd kubelet=${KUBE_VERSION}-00 kubeadm=${KUBE_VERSION}-00 kubectl=${KUBE_VERSION}-00 kubernetes-cni
apt-mark hold kubelet kubeadm kubectl kubernetes-cni
### containerd
cat <<EOF | sudo tee /etc/modules-load.d/containerd.conf
overlay
br_netfilter
EOF
sudo modprobe overlay
sudo modprobe br_netfilter
cat <<EOF | sudo tee /etc/sysctl.d/99-kubernetes-cri.conf
net.bridge.bridge-nf-call-iptables = 1
net.ipv4.ip_forward = 1
net.bridge.bridge-nf-call-ip6tables = 1
EOF
sudo sysctl --system
sudo mkdir -p /etc/containerd
### containerd config
cat > /etc/containerd/config.toml <<EOF
disabled_plugins = []
imports = []
oom_score = 0
plugin_dir = ""
required_plugins = []
root = "/var/lib/containerd"
state = "/run/containerd"
version = 2
[plugins]
[plugins."io.containerd.grpc.v1.cri".containerd.runtimes]
[plugins."io.containerd.grpc.v1.cri".containerd.runtimes.runc]
base_runtime_spec = ""
container_annotations = []
pod_annotations = []
privileged_without_host_devices = false
runtime_engine = ""
runtime_root = ""
runtime_type = "io.containerd.runc.v2"
[plugins."io.containerd.grpc.v1.cri".containerd.runtimes.runc.options]
BinaryName = ""
CriuImagePath = ""
CriuPath = ""
CriuWorkPath = ""
IoGid = 0
IoUid = 0
NoNewKeyring = false
NoPivotRoot = false
Root = ""
ShimCgroup = ""
SystemdCgroup = false
EOF
### crictl uses containerd as default
{
cat <<EOF | sudo tee /etc/crictl.yaml
runtime-endpoint: unix:///run/containerd/containerd.sock
EOF
}
### kubelet should use containerd
{
cat <<EOF | sudo tee /etc/default/kubelet
KUBELET_EXTRA_ARGS="--container-runtime remote --container-runtime-endpoint unix:///run/containerd/containerd.sock"
EOF
}
### start services
systemctl daemon-reload
systemctl enable containerd
systemctl restart containerd
systemctl enable kubelet && systemctl start kubelet
### init k8s
rm /root/.kube/config || true
kubeadm init --kubernetes-version=${KUBE_VERSION} --ignore-preflight-errors=NumCPU --skip-token-print --pod-network-cidr 192.168.0.0/16
mkdir -p ~/.kube
sudo cp -i /etc/kubernetes/admin.conf ~/.kube/config
### CNI
kubectl apply -f https://raw.githubusercontent.com/killer-sh/cks-course-environment/master/cluster-setup/calico.yaml
# etcdctl
ETCDCTL_VERSION=v3.5.1
ETCDCTL_VERSION_FULL=etcd-${ETCDCTL_VERSION}-linux-amd64
wget https://github.com/etcd-io/etcd/releases/download/${ETCDCTL_VERSION}/${ETCDCTL_VERSION_FULL}.tar.gz
tar xzf ${ETCDCTL_VERSION_FULL}.tar.gz
mv ${ETCDCTL_VERSION_FULL}/etcdctl /usr/bin/
rm -rf ${ETCDCTL_VERSION_FULL} ${ETCDCTL_VERSION_FULL}.tar.gz
echo
echo "### COMMAND TO ADD A WORKER NODE ###"
kubeadm token create --print-join-command --ttl 0
view raw install_master.sh hosted with ❤ by GitHub
#!/bin/sh
# Source: http://kubernetes.io/docs/getting-started-guides/kubeadm
set -e
source /etc/lsb-release
if [ "$DISTRIB_RELEASE" != "20.04" ]; then
echo "################################# "
echo "############ WARNING ############ "
echo "################################# "
echo
echo "This script only works on Ubuntu 20.04!"
echo "You're using: ${DISTRIB_DESCRIPTION}"
echo "Better ABORT with Ctrl+C. Or press any key to continue the install"
read
fi
KUBE_VERSION=1.22.9
### setup terminal
apt-get update
apt-get install -y bash-completion binutils
echo 'colorscheme ron' >> ~/.vimrc
echo 'set tabstop=2' >> ~/.vimrc
echo 'set shiftwidth=2' >> ~/.vimrc
echo 'set expandtab' >> ~/.vimrc
echo 'source <(kubectl completion bash)' >> ~/.bashrc
echo 'alias k=kubectl' >> ~/.bashrc
echo 'alias c=clear' >> ~/.bashrc
echo 'complete -F __start_kubectl k' >> ~/.bashrc
sed -i '1s/^/force_color_prompt=yes\n/' ~/.bashrc
### disable linux swap and remove any existing swap partitions
swapoff -a
sed -i '/\sswap\s/ s/^\(.*\)$/#\1/g' /etc/fstab
### remove packages
kubeadm reset -f || true
crictl rm --force $(crictl ps -a -q) || true
apt-mark unhold kubelet kubeadm kubectl kubernetes-cni || true
apt-get remove -y docker.io containerd kubelet kubeadm kubectl kubernetes-cni || true
apt-get autoremove -y
systemctl daemon-reload
### install podman
. /etc/os-release
echo "deb https://download.opensuse.org/repositories/devel:/kubic:/libcontainers:/testing/xUbuntu_${VERSION_ID}/ /" | sudo tee /etc/apt/sources.list.d/devel:kubic:libcontainers:testing.list
curl -L "https://download.opensuse.org/repositories/devel:/kubic:/libcontainers:/testing/xUbuntu_${VERSION_ID}/Release.key" | sudo apt-key add -
apt-get update -qq
apt-get -qq -y install podman cri-tools containers-common
rm /etc/apt/sources.list.d/devel:kubic:libcontainers:testing.list
cat <<EOF | sudo tee /etc/containers/registries.conf
[registries.search]
registries = ['docker.io']
EOF
### install packages
curl https://packages.cloud.google.com/apt/doc/apt-key.gpg | apt-key add -
cat <<EOF > /etc/apt/sources.list.d/kubernetes.list
deb http://apt.kubernetes.io/ kubernetes-xenial main
EOF
apt-get update
apt-get install -y docker.io containerd kubelet=${KUBE_VERSION}-00 kubeadm=${KUBE_VERSION}-00 kubectl=${KUBE_VERSION}-00 kubernetes-cni
apt-mark hold kubelet kubeadm kubectl kubernetes-cni
### containerd
cat <<EOF | sudo tee /etc/modules-load.d/containerd.conf
overlay
br_netfilter
EOF
sudo modprobe overlay
sudo modprobe br_netfilter
cat <<EOF | sudo tee /etc/sysctl.d/99-kubernetes-cri.conf
net.bridge.bridge-nf-call-iptables = 1
net.ipv4.ip_forward = 1
net.bridge.bridge-nf-call-ip6tables = 1
EOF
sudo sysctl --system
sudo mkdir -p /etc/containerd
### containerd config
cat > /etc/containerd/config.toml <<EOF
disabled_plugins = []
imports = []
oom_score = 0
plugin_dir = ""
required_plugins = []
root = "/var/lib/containerd"
state = "/run/containerd"
version = 2
[plugins]
[plugins."io.containerd.grpc.v1.cri".containerd.runtimes]
[plugins."io.containerd.grpc.v1.cri".containerd.runtimes.runc]
base_runtime_spec = ""
container_annotations = []
pod_annotations = []
privileged_without_host_devices = false
runtime_engine = ""
runtime_root = ""
runtime_type = "io.containerd.runc.v2"
[plugins."io.containerd.grpc.v1.cri".containerd.runtimes.runc.options]
BinaryName = ""
CriuImagePath = ""
CriuPath = ""
CriuWorkPath = ""
IoGid = 0
IoUid = 0
NoNewKeyring = false
NoPivotRoot = false
Root = ""
ShimCgroup = ""
SystemdCgroup = false
EOF
### crictl uses containerd as default
{
cat <<EOF | sudo tee /etc/crictl.yaml
runtime-endpoint: unix:///run/containerd/containerd.sock
EOF
}
### kubelet should use containerd
{
cat <<EOF | sudo tee /etc/default/kubelet
KUBELET_EXTRA_ARGS="--container-runtime remote --container-runtime-endpoint unix:///run/containerd/containerd.sock"
EOF
}
### start services
systemctl daemon-reload
systemctl enable containerd
systemctl restart containerd
systemctl enable kubelet && systemctl start kubelet
### init k8s
kubeadm reset -f
systemctl daemon-reload
service kubelet start
echo
echo "EXECUTE ON MASTER: kubeadm token create --print-join-command --ttl 0"
echo "THEN RUN THE OUTPUT AS COMMAND HERE TO ADD AS WORKER"
echo
view raw install_worker.sh hosted with ❤ by GitHub
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