kubernetes-on-centos.md

All nodes

• Swap must be disabled
  • swapoff -a
  • Comment out reference to swap in /etc/fstab
• yum -y install docker
• systemctl enable docker && systemctl start docker
• Add Kubernetes repo

  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
  EOF

• Make SELinux chill out during K8s install
  • setenforce 0
  • Set 'enforcing' to 'permissive' in /etc/selinux/config
• yum install -y kubelet kubeadm kubectl
• systemctl enable kubelet && systemctl start kubelet
• Manage networking stuff

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

• sysctl --system

Master

• kubeadm init --pod-network-cidr=10.244.0.0/16
• Save the kubeadm join command somewhere safe
• Drop back to standard user and configure kubectl

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

• kubectl apply -f https://raw.githubusercontent.com/coreos/flannel/v0.9.1/Documentation/kube-flannel.yml

Workers

• Execute the join command saved from the master