k8install

# Update all packages
yum update -y

# Install the yum-config-manager and add the repo to install docker
sudo yum install -y yum-utils device-mapper-persistent-data lvm2
sudo yum-config-manager --add-repo https://download.docker.com/linux/centos/docker-ce.repo

# Configure iptables for Kubernetes
cat <<EOF >  /etc/sysctl.d/k8s.conf
net.bridge.bridge-nf-call-ip6tables = 1
net.bridge.bridge-nf-call-iptables = 1
EOF
sysctl --system

# Add the kubernetes repo needed to find the kubelet, kubeadm and kubectl packages
cat <<EOF > /etc/yum.repos.d/kubernetes.repo
[kubernetes]
name=Kubernetes
baseurl=https://packages.cloud.google.com/yum/repos/kubernetes-el7-x86_64
enabled=1
gpgcheck=1
repo_gpgcheck=1
gpgkey=https://packages.cloud.google.com/yum/doc/yum-key.gpg https://packages.cloud.google.com/yum/doc/rpm-package-key.gpg
exclude=kube*
EOF

# Set SELinux in permissive mode (effectively disabling it)
setenforce 0
sed -i 's/^SELINUX=enforcing$/SELINUX=permissive/' /etc/selinux/config

# Turn off the swap: Required for Kubernetes to work
sudo swapoff -a

# Install Kubernetes and Docker
sudo yum install -y kubelet-1.16.3 kubeadm-1.16.3 kubectl-1.16.3 --disableexcludes=kubernetes docker-ce-18.09.0-3.el7  docker-ce-cli-18.09.0-3.el7  containerd.io

## Create /etc/docker directory.
mkdir /etc/docker

# Setup daemon.
cat > /etc/docker/daemon.json <<EOF
{
  "exec-opts": ["native.cgroupdriver=systemd"],
  "log-driver": "json-file",
  "log-opts": {
    "max-size": "100m"
  },
  "storage-driver": "overlay2",
  "storage-opts": [
    "overlay2.override_kernel_check=true"
  ]
}
EOF

mkdir -p /etc/systemd/system/docker.service.d

# Restart Docker
systemctl daemon-reload
systemctl restart docker
systemctl enable --now docker

# For sanity, just disable the entire firewall until you've figured out exactly what services you'll want to install.
systemctl disable firewalld --now # Disable the firewall

# Start Kubernetes
systemctl enable --now kubelet