AlmaLinux 9上安装Kubernetes 1.25集群

0. 确认Linux版本

uname -a

1. 禁用swap

sudo swapoff -a

2. 禁用防火墙

sudo systemctl stop firewalld
sudo systemctl disable firewalld

3. 将SELinux设置为permissive模式

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

4. 更新/etc/hosts

/etc/hosts中加入下面命令的输出结果

echo $(hostname -i) $(hostname -long)

5. 安装podman, podman remotes, socat, runc, conmon

sudo dnf install -y podman podman-remote socat runc conmon

启用 podman socket

sudo systemctl enable -- now podman.socket

检查远程 podman-remote info 的显示信息

sudo podman-remote info

6. 安装crio

sudo rpm -ivh https://download.opensuse.org/repositories/devel:/kubic:/libcontainers:/stable:/cri-o:/1.25:/1.25.1/Fedora_36/x86_64/cri-o-1.25.1-3.1.fc36.x86_64.rpm
sudo systemctl enable --now crio

7. 安装kubelet kubeadm kubectl

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

sudo dnf install -y kubelet kubeadm kubectl --disableexcludes=kubernetes
sudo systemctl enable --now kubelet

8. 更新模块设置

cat <<EOF | sudo tee /etc/modules-load.d/k8s.conf
overlay
br_netfilter
EOF

对模块使用modprobe

sudo modprobe overlay
sudo modprobe br_netfilter

为 k8s.conf 设置 sysctl.d

cat <<EOF | sudo tee /etc/sysctl.d/k8s.conf
net.bridge.bridge-nf-call-iptables  = 1
net.bridge.bridge-nf-call-ip6tables = 1
net.ipv4.ip_forward                 = 1
EOF

应用 sysctl 参数，无需重启

sysctl --system

9. 设置一个calico ignore并加载calicoctl

cat << EOF > /etc/NetworkManager/conf.d/calico.conf
[keyfile]
unmanaged-devices=interface-name:cali*;interface-name:tunl*;interface-name:vxlan.calico;interface-name:vxlan-v6.calico;interface-name:wireguard.cali;interface-name:wg-v6.cali
EOF

下载和安装calicoctl

curl -L -o calicoctl https://github.com/projectcalico/calico/releases/download/v3.24.5/calicoctl-linux-amd64
chmod +x calicoctl
mv calicoctl /bin

编辑 crio，添加最后两个值

vi /etc/crio/crio.conf
---
[crio.runtime]
conmon_cgroup = "pod"
cgroup_manager = "systemd"
---

10. 初始化Kubernetes集群

kubeadm init --cri-socket=unix:///var/run/crio/crio.sock --pod-network-cidr=10.244.0.0/16

11. 配置集群访问

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

kubectl taint nodes --all node-role.kubernetes.io/control-plane-

kubectl completion bash | sudo tee /etc/bash_completion.d/kubectl > /dev/null
echo 'alias k=kubectl' >>~/.bashrc
echo 'complete -o default -F __start_kubectl k' >>~/.bashrc

12. 确认集群

kubectl get nodes
kubectl get pods -A

完结！