禁用防火墙

systemctl stop firewalld.service & systemctl disable firewalld.service

禁用交换分区

sysctl vm.swappiness=0 & sysctl -p
systemctl stop swap-create@zram0
yum remove -y zram-generator-defaults

禁用 SELinux

sudo setenforce 0 & sudo sed -i 's/^SELINUX=enforcing$/SELINUX=permissive/' /etc/selinux/config

安装 iptables

yum install -y iptables iproute-tc

允许 iptables 检查桥接流量

cat <<EOF | tee /etc/modules-load.d/k8s.conf
br_netfilter
EOFcat <<EOF | tee /etc/sysctl.d/k8s.conf
net.bridge.bridge-nf-call-ip6tables = 1
net.bridge.bridge-nf-call-iptables = 1
net.ipv4.ip_forward = 1
EOFsysctl --system

添加镜像源

cat <<EOF | sudo tee /etc/yum.repos.d/kubernetes.repo
[kubernetes]
name=Kubernetes
baseurl=https://pkgs.k8s.io/core:/stable:/v1.31/rpm/
enabled=1
gpgcheck=1
gpgkey=https://pkgs.k8s.io/core:/stable:/v1.31/rpm/repodata/repomd.xml.key
exclude=kubelet kubeadm kubectl cri-tools kubernetes-cni
EOF

安装 crio kubelet kubeadm kubectl

建议用crio作为容器运行时，containerd网络问题太麻烦

yum install -y crio kubelet kubeadm kubectl --disableexcludes=kubernetes
systemctl enable --now crio & systemctl enable --now kubelet & yum clean all

重载沙箱（pause）镜像

sed -i "s/# pause_image = .*/pause_image = \"registry.aliyuncs.com\/google_containers\/pause:3.10\"/g" /etc/crio/crio.conf

配置国内镜像地址

vi /etc/containers/registries.conf

unqualified-search-registries = ["docker.m.daocloud.io", "docker.io", "k8s.gcr.io", "registry.k8s.io", "registry.fedoraproject.org", "registry.access.redhat.com", "registry.centos.org"][[registry]]
prefix = "docker.io"
location = "docker.m.daocloud.io"[[registry]]
prefix = "*registry.k8s.io"
location = "registry.aliyuncs.com/google_containers"[[registry]]
prefix = "*.gcr.io"
location = "docker.m.daocloud.io"[[registry]]
prefix = "registry.centos.org"
location = "docker.m.daocloud.io"

初始化集群

kubeadm init --pod-network-cidr=192.168.56.101/24 --apiserver-advertise-address=192.168.56.101 --apiserver-cert-extra-sans=192.168.56.101 --cri-socket=unix:///var/run/crio/crio.sock --image-repository=registry.aliyuncs.com/google_containers

复制配置文件使kubectl可用

非root用户

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

root用户

echo "export KUBECONFIG=/etc/kubernetes/admin.conf" >> ~/.bash_profile & source ~/.bash_profile

查看节点状态

kubectl describe node

设置节点可以调度

单节点master默认不可被调度

kubectl taint nodes <node-name> node-role.kubernetes.io/control-plane:NoSchedule-