how to create k8s cluster with kubeadm on centos7

  1. install dependencies

    swapoff -a
yum install socat conntrack yum-utils nfs-utils chrony -y
yum-config-manager --add-repo https://download.docker.com/linux/centos/docker-ce.repo
mkdir -p /etc/docker
cat <<EOF |  tee /etc/docker/daemon.json
{
  "exec-opts": ["native.cgroupdriver=systemd"],
  "log-driver": "json-file",
  "log-opts": {
    "max-size": "100m"
  },
  "storage-driver": "overlay2"
}
EOF
cat <<EOF |  tee /etc/modules-load.d/k8s.conf
br_netfilter
EOF
cat <<EOF |  tee /etc/sysctl.d/k8s.conf
net.bridge.bridge-nf-call-ip6tables = 1
net.bridge.bridge-nf-call-iptables = 1
EOF
sysctl --system
cat <<EOF |  tee /etc/yum.repos.d/kubernetes.repo
[kubernetes]
name=Kubernetes
baseurl=https://packages.cloud.google.com/yum/repos/kubernetes-el7-\$basearch
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=kubelet kubeadm kubectl
EOF
yum install docker-ce -y
systemctl start docker && systemctl enable docker
yum install -y kubelet-1.23.17 kubectl-1.23.17 kubeadm-1.23.17 --disableexcludes=kubernetes
systemctl enable --now kubelet && systemctl disable firewalld && systemctl stop firewalld
#remember to append to hosts file
kubeadm init --apiserver-advertise-address=192.168.0.1 --control-plane-endpoint 192.168.0.1 --pod-network-cidr=172.16.0.0/16
#kubectl taint nodes --all node-role.kubernetes.io/master-
curl -LO https://docs.projectcalico.org/manifests/tigera-operator.yaml
curl -LO https://docs.projectcalico.org/manifests/custom-resources.yaml

    edit yaml, replace operator version(1.17.4) and address, apply yaml.

  2. add nodes

    kubeadm token create --print-join-command

references: