setup-crio.sh

setup-crio.sh

#!/bin/bash

set -ex

# Set up required sysctl params, these persist across reboots.
cat > /etc/sysctl.d/99-kubernetes-cri.conf <<EOF
net.bridge.bridge-nf-call-iptables  = 1
net.ipv4.ip_forward                 = 1
net.bridge.bridge-nf-call-ip6tables = 1
EOF

sysctl --system

export VERSION=1.19
export OS=CentOS_8

curl -L -o /etc/yum.repos.d/devel:kubic:libcontainers:stable.repo https://download.opensuse.org/repositories/devel:/kubic:/libcontainers:/stable/$OS/devel:kubic:libcontainers:stable.repo
curl -L -o /etc/yum.repos.d/devel:kubic:libcontainers:stable:cri-o:$VERSION.repo https://download.opensuse.org/repositories/devel:kubic:libcontainers:stable:cri-o:$VERSION/$OS/devel:kubic:libcontainers:stable:cri-o:$VERSION.repo
yum install cri-o -y

systemctl enable cri-o
systemctl start cri-o

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

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

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

systemctl enable --now kubelet

modprobe overlay
modprobe br_netfilter

cat > ~/init_kubelet.yaml <<EOF
apiVersion: kubeadm.k8s.io/v1beta2
kind: InitConfiguration
nodeRegistration:
  kubeletExtraArgs:
    logging-format: "json"
---
apiVersion: kubeadm.k8s.io/v1beta2
kind: ClusterConfiguration
apiServer:
  extraArgs:
    logging-format: "json"
controllerManager:
  extraArgs:
    logging-format: "json"
scheduler:
  extraArgs:
    logging-format: "json"
---
apiVersion: kubelet.config.k8s.io/v1beta1
kind: KubeletConfiguration
cgroupDriver: "systemd"
EOF

kubeadm init --config init_kubelet.yaml

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

# シングルスタークラスターなので、ワークロードをマスターに載せる許可設定
kubectl taint nodes --all node-role.kubernetes.io/master-

# CNIとしてCilliumを入れる
curl https://raw.githubusercontent.com/helm/helm/master/scripts/get-helm-3 | bash

helm repo add cilium https://helm.cilium.io/

helm install cilium cilium/cilium --version 1.8.2 \
    --namespace kube-system \
    --set global.containerRuntime.integration=crio

# CRI-OはデフォルトでCNIを認識してくれないので、プロセスの再起動が必要
# ref. https://docs.cilium.io/en/v1.8/concepts/kubernetes/configuration/#crio
systemctl restart cri-o

cat > ~/app.yaml <<EOF
apiVersion: apps/v1
kind: Deployment
metadata:
  name: nginx-deployment
spec:
  selector:
    matchLabels:
      app: nginx
  replicas: 3
  template:
    metadata:
      labels:
        app: nginx
    spec:
      containers:
      - name: nginx
        image: nginx:1.18.0-alpine
        ports:
        - containerPort: 80
---
kind: Service
apiVersion: v1
metadata:
  name: nginx-service
  labels:
    app: nginx
spec:
  ports:
  - port: 80
    targetPort: 80
  selector:
    app: nginx
  type: NodePort
EOF