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k8s-setup.sh
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k8s-setup.sh
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#!/usr/bin/env bash
# Kubernetes host setup script using Kubeadm for Debian & Redhat distribution
PUBIPM=`curl -s checkip.dyndns.org | sed -e 's/.*Current IP Address: //' -e 's/<.*$//'`
K8S_VER=1.29.0-00
if [[ -n $(uname -a | grep -iE 'ubuntu|debian') ]]; then
OS=Ubuntu
HIP=`ip -o -4 addr list ens4 | awk '{print $4}' | cut -d/ -f1`
else
HIP=`ip -o -4 addr list eth0 | awk '{print $4}' | cut -d/ -f1`
fi
if [[ "$K8S_VER" == "" ]]; then K8S_VER=$(curl -s https://storage.googleapis.com/kubernetes-release/release/stable.txt | cut -d v -f2); fi
K8S_VER_MJ=$(echo "$K8S_VER" | cut -c 1-4)
# Disable swap
swapoff -a
sed -i.bak -r 's/(.+ swap .+)/#\1/' /etc/fstab
cat <<EOF |sudo tee /etc/sysctl.d/kubernetes.conf
net.bridge.bridge-nf-call-ip6tables = 1
net.bridge.bridge-nf-call-iptables = 1
net.ipv4.ip_forward = 1
EOF
cat <<EOF | sudo tee /etc/modules-load.d/containerd.conf
overlay
br_netfilter
EOF
modprobe overlay
modprobe br_netfilter
sysctl --system
## Installation based on OS
### For Debian distribution
if [[ "$OS" == "Ubuntu" ]]; then
# Stopping and disabling firewalld by running the commands on all servers:
systemctl stop ufw
systemctl disable ufw
# Install some of the tools, we’ll need on our servers.
apt update
apt install apt-transport-https ca-certificates gpg nfs-common curl wget git net-tools unzip jq zip nmap telnet dos2unix apparmor ldap-utils -y
mkdir -m 755 /etc/apt/keyrings
curl -fsSL https://pkgs.k8s.io/core:/stable:/v${K8S_VER_MJ}/deb/Release.key | sudo gpg --dearmor -o /etc/apt/keyrings/kubernetes-apt-keyring.gpg
echo deb [signed-by=/etc/apt/keyrings/kubernetes-apt-keyring.gpg] https://pkgs.k8s.io/core:/stable:/v$K8S_VER_MJ/deb/ / | sudo tee /etc/apt/sources.list.d/kubernetes.list
# Install Container Runtime, Kubeadm, Kubelet & Kubectl
curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo apt-key add -
add-apt-repository "deb [arch=amd64] https://download.docker.com/linux/ubuntu $(lsb_release -cs) stable" -y
apt update
rm -I /etc/containerd/config.toml
apt install -y containerd.io
apt install -y kubelet kubeadm kubectl
apt-mark hold kubelet kubeadm kubectl
### For Redhat distribution
else
# Stopping and disabling firewalld & SELinux
systemctl stop firewalld
systemctl disable firewalld
setenforce 0
sed -i --follow-symlinks 's/SELINUX=enforcing/SELINUX=disabled/g' /etc/sysconfig/selinux
# Install some of the tools, we’ll need on our servers.
yum install -y git curl wget bind-utils jq httpd-tools zip unzip nfs-utils go nmap telnet dos2unix java-1.7.0-openjdk
# Add the kubernetes repository to yum so that we can use our package manager to install the latest version of kubernetes.
cat <<EOF | sudo tee /etc/yum.repos.d/kubernetes.repo
[kubernetes]
name=Kubernetes
baseurl=https://pkgs.k8s.io/core:/stable:/v$K8S_VER_MJ/rpm/
enabled=1
gpgcheck=1
gpgkey=https://pkgs.k8s.io/core:/stable:/v$K8S_VER_MJ/rpm/repodata/repomd.xml.key
exclude=kubelet kubeadm kubectl cri-tools kubernetes-cni
EOF
# Install Container Runtime, Kubeadm, Kubelet & Kubectl
yum config-manager --add-repo https://download.docker.com/linux/centos/docker-ce.repo
yum install -y yum-utils containerd.io && rm -I /etc/containerd/config.toml
yum install -y kubelet kubeadm kubectl --disableexcludes=kubernetes
fi
## Installation based on OS
mkdir -p /etc/containerd
containerd config default > /etc/containerd/config.toml
sed -i -e 's\ SystemdCgroup = false\ SystemdCgroup = true\g' /etc/containerd/config.toml
cat <<EOF | tee /etc/crictl.yaml
runtime-endpoint: "unix:///run/containerd/containerd.sock"
timeout: 0
debug: false
EOF
# After installing containerd, kubernetes tools & enable the services so that they persist post reboots.
systemctl enable --now containerd; systemctl start containerd
#systemctl status containerd
systemctl enable --now kubelet; systemctl start kubelet
#systemctl status kubelet
sleep 10
systemctl restart containerd
# K8s images pull
kubeadm config images pull
# Uncomment next line (exit) for Node setup & use join node command
#exit
# Setting up Kubernetes Master using Kubeadm
kubeadm init --pod-network-cidr=10.244.0.0/16 --ignore-preflight-errors=all
cp /etc/kubernetes/admin.conf $HOME/
chown $(id -u):$(id -g) $HOME/admin.conf
export KUBECONFIG=$HOME/admin.conf
echo "export KUBECONFIG=$HOME/admin.conf" >> $HOME/.bash_profile
echo "alias oc=/usr/bin/kubectl" >> /root/.bash_profile
wget -q https://github.com/flannel-io/flannel/releases/latest/download/kube-flannel.yml
kubectl create -f kube-flannel.yml
sleep 20
kubectl get nodes
MASTER=`kubectl get nodes | grep control-plane | awk '{print $1}'`
kubectl taint nodes $MASTER node-role.kubernetes.io/control-plane-
kubectl get nodes -o json | jq .items[].spec.taints
# Setup Ingress
wget -q https://raw.githubusercontent.com/cloudcafetech/k8s-ad-integration/main/deploy.yaml
sed -i -e 's\ #hostNetwork: true\ hostNetwork: true\g' deploy.yaml
kubectl create -f deploy.yaml
sleep 10
kubectl scale --replicas=2 deployment/ingress-nginx-controller -n ingress-nginx
# Check for Ingress POD UP
echo "Waiting for Ingress POD ready .."
sleep 10
INGPOD=`kubectl get pod -n ingress-nginx -o wide | grep ingress-nginx-controller | grep $(kubectl get no | grep control-plane | awk '{print $1}') | awk '{print $1}'`
kubectl wait pods/$INGPOD --for=condition=Ready --timeout=5m -n ingress-nginx
# Setup Metric Server
wget -q https://raw.githubusercontent.com/cloudcafetech/rke2-airgap/main/metric-server.yaml
kubectl create -f metric-server.yaml
# Setup local storage
wget -q https://raw.githubusercontent.com/cloudcafetech/rke2-airgap/main/local-path-storage.yaml
kubectl create -f local-path-storage.yaml
# Setup reloader
wget -q https://raw.githubusercontent.com/cloudcafetech/k8s-ad-integration/main/reloader.yaml
kubectl create -f reloader.yaml
# Setup Monitoring
wget -q https://raw.githubusercontent.com/cloudcafetech/AI-for-K8S/main/kubemon.yaml
wget -q https://github.com/cloudcafetech/kubesetup/raw/master/monitoring/dashboard/pod-monitoring.json
wget -q https://github.com/cloudcafetech/kubesetup/raw/master/monitoring/dashboard/kube-monitoring-overview.json
sed -i "s/34.125.24.130/$PUBIPM/g" kubemon.yaml
kubectl create ns monitoring
kubectl create configmap grafana-dashboards -n monitoring --from-file=pod-monitoring.json --from-file=kube-monitoring-overview.json
#kubectl create -f kubemon.yaml -n monitoring
# Setup Logging
wget -q https://raw.githubusercontent.com/cloudcafetech/kubesetup/master/logging/promtail.yaml
wget -q https://raw.githubusercontent.com/cloudcafetech/k8s-ad-integration/main/kubelog.yaml
wget -q https://raw.githubusercontent.com/cloudcafetech/k8s-ad-integration/main/loki.yaml
wget -q https://raw.githubusercontent.com/cloudcafetech/k8s-ad-integration/main/minio.yaml
sed -i "s/34.16.137.32/$PUBIPM/g" minio.yaml
sed -i "s/1.2.3.4/$HIP/g" minio.yaml
kubectl create ns logging
kubectl create secret generic loki -n logging --from-file=loki.yaml
#kubectl create -f kubelog.yaml -n logging
#kubectl delete ds loki-fluent-bit-loki -n logging
#kubectl create -f promtail.yaml -n logging
# Helm Setup
curl -fsSL -o get_helm.sh https://raw.githubusercontent.com/helm/helm/main/scripts/get-helm-3
chmod 700 get_helm.sh
./get_helm.sh
# AD Integration
wget -q https://raw.githubusercontent.com/cloudcafetech/k8s-ad-integration/main/ad-integration.sh
chmod 755 ad-integration.sh
#./ad-integration.sh
# Install MinIO client
wget -q https://dl.min.io/client/mc/release/linux-amd64/mc
chmod +x mc
mv mc /usr/local/bin/mc
# Setup K8SGPT
if [[ "$OS" == "Ubuntu" ]]; then
curl -LO https://github.com/k8sgpt-ai/k8sgpt/releases/download/v0.3.21/k8sgpt_amd64.deb
sudo dpkg -i k8sgpt_amd64.deb
else
curl -LO https://github.com/k8sgpt-ai/k8sgpt/releases/download/v0.3.21/k8sgpt_amd64.rpm
sudo rpm -ivh -i k8sgpt_amd64.rpm
fi
# Install krew
set -x; cd "$(mktemp -d)" &&
OS="$(uname | tr '[:upper:]' '[:lower:]')" &&
ARCH="$(uname -m | sed -e 's/x86_64/amd64/' -e 's/\(arm\)\(64\)\?.*/\1\2/' -e 's/aarch64$/arm64/')" &&
KREW="krew-${OS}_${ARCH}" &&
curl -fsSLO "https://github.com/kubernetes-sigs/krew/releases/latest/download/${KREW}.tar.gz" &&
tar zxvf "${KREW}.tar.gz" &&
./"${KREW}" install krew
export PATH="${KREW_ROOT:-$HOME/.krew}/bin:$PATH"
# Install kubectl plugins using krew
kubectl krew install modify-secret
kubectl krew install ctx
kubectl krew install ns
kubectl krew install oidc-login
echo 'export PATH="${PATH}:${HOME}/.krew/bin"' >> /root/.bash_profile