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kubeadm-install.md

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Setup K8S by kubeadm

Install kubelet

cat <<EOF | sudo 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
gpgkey=https://packages.cloud.google.com/yum/doc/rpm-package-key.gpg
exclude=kubelet kubeadm kubectl
EOF

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

sudo yum install -y kubelet kubeadm kubectl --disableexcludes=kubernetes

sudo systemctl enable --now kubelet

Enable CRI

# comment out line: `disabled_plugins = ["cri"]`
sudo vim /etc/containerd/config.toml

# restart containerd
sudo systemctl restart containerd

Setup K8S

# replace "172.26.10.67" with the IP address of your machine
sudo kubeadm init --ignore-preflight-errors Swap --apiserver-advertise-address=172.26.10.67 --pod-network-cidr=10.244.0.0/16
# follow instructions to copy kubeconfig file to $HOME/.kube/config


kubectl create -f https://raw.githubusercontent.com/coreos/flannel/v0.22.0/Documentation/kube-flannel.yml

or
https://github.com/coreos/flannel/raw/master/Documentation/kube-flannel.yml

Setup Hugepage

# set hugepage
sudo bash -c "echo 256 > /sys/kernel/mm/hugepages/hugepages-2048kB/nr_hugepages"

# restart kubelet
sudo systemctl restart kubelet

# check if kubelet has recognized huagepage
kubectl get nodes -oyaml | grep hugepages-2Mi

Check Status

# check node status to be Ready
$kubectl get node
NAME                                              STATUS   ROLES           AGE    VERSION
ip-172-26-10-67.ap-northeast-1.compute.internal   Ready    control-plane   139m   v1.27.4

# all pods should be Running
$kubectl get pods --all-namespaces
NAMESPACE      NAME                                                                      READY   STATUS    RESTARTS      AGE
kube-flannel   kube-flannel-ds-h5dcn                                                     1/1     Running   0             138m
kube-system    coredns-5d78c9869d-g4x5w                                                  1/1     Running   0             139m
kube-system    coredns-5d78c9869d-x8hmd                                                  1/1     Running   0             139m
kube-system    etcd-ip-172-26-10-67.ap-northeast-1.compute.internal                      1/1     Running   0             139m
kube-system    kube-apiserver-ip-172-26-10-67.ap-northeast-1.compute.internal            1/1     Running   0             139m
kube-system    kube-controller-manager-ip-172-26-10-67.ap-northeast-1.compute.internal   1/1     Running   0             139m
kube-system    kube-proxy-zs75b                                                          1/1     Running   0             139m
kube-system    kube-scheduler-ip-172-26-10-67.ap-northeast-1.compute.internal            1/1     Running   0             139m