[blockquote2 name=’洛维花’]声明:本教程并不是我原创,因脑子问题,好记性不如笔记以及中途使用中出现其他问题,有个具体化的解决办法,于是便进行了搬运,并稍作更改。文章尾部带有原作者的链接。[/tip]
附上原作者的录像
环境准备
本文服务器的公网IP:192.168.56.101
- OS version: CentOS 7
- CPU Architecture: x86_64/amd64
- K8s version: v1.23.17
- Docker version: 20.10.23
安装依赖
yum install -y \ curl \ wget \ systemd \ bash-completion \ lrzsz
安装前准备
- 同步服务器时间
timedatectl set-timezone Asia/Shanghai && timedatectl set-local-rtc 0 systemctl restart rsyslog systemctl restart crond
- 修改主机名
方便通过主机名访问对于的服务器
# 主节点 hostnamectl set-hostname k8s-master # 从节点 hostnamectl set-hostname k8s-node1 hostnamectl set-hostname k8s-node2
修改hosts
cat >/etc/hosts <<EOF 192.168.56.101 k8s-master 192.168.56.102 k8s-node1 192.168.56.103 k8s-node2 EOF
- 开启必要的端口
因是测试环境,直接关闭防火墙
systemctl disable firewalld.service && systemctl stop firewalld.service
容器运行时
- 转发IPv4并让iptables看到桥接流量
cat >/etc/modules-load.d/k8s.conf <<EOF overlay br_netfilter EOF modprobe overlay modprobe br_netfilter cat >/etc/sysctl.d/k8s.conf <<EOF net.bridge.bridge-nf-call-iptables=1 net.bridge.bridge-nf-call-ip6tables=1 net.ipv4.ip_forward=1 EOF sysctl --system # 通过运行以下指令确认 br_netfilter 和 overlay 模块被加载 lsmod | egrep 'overlay|br_netfilter' # 通过运行以下指令确认 net.bridge.bridge-nf-call-iptables、net.bridge.bridge-nf-call-ip6tables 系统变量在你的 sysctl 配置中被设置为 1 sysctl net.bridge.bridge-nf-call-iptables net.bridge.bridge-nf-call-ip6tables net.ipv4.ip_forward
- 安装容器运行时
[blockquote2 name=’洛维花’]注意:k8s v1.24及以后不在支持Docker Engine[/tip]
安装Docker
[blockquote2 name=’洛维花’]官方文档:https://docs.docker.com/engine/install/centos/[/tip]
yum install -y yum-utils # 设置yum阿里云镜像 yum-config-manager --add-repo http://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo mkdir -p /etc/docker # 设置阿里云镜像/日志/cgroup驱动 cat >/etc/docker/daemon.json <<EOF { "exec-opts": ["native.cgroupdriver=systemd"], "log-driver": "json-file", "log-opts": { "max-size": "100m" }, "storage-driver": "overlay2", "storage-opts": [ "overlay2.override_kernel_check=true" ], "registry-mirrors":["https://hub-mirror.c.163.com","https://docker.mirrors.ustc.edu.cn","https://registry.docker-cn.com"] } EOF yum makecache fast yum install -y docker-ce-20.10.23 docker-ce-cli-20.10.23 containerd.io systemctl daemon-reload systemctl enable docker && systemctl restart docker
安装containerd(这个其实是另一种的容器工具,我们已经安装了docker,并不需要再安装这个了。)
yum install -y yum-utils yum-config-manager --add-repo http://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo yum makecache fast yum install -y containerd.io mkdir -p /etc/containerd 生成默认文件 containerd config default > /etc/containerd/config.toml 编辑配置文件 设置驱动方式为systemd 设置pause镜像 镜像仓库的加速器 sed -i "s#SystemdCgroup = false#SystemdCgroup = true#g" /etc/containerd/config.toml sed -i "s#registry.k8s.io#registry.cn-hangzhou.aliyuncs.com/google_containers#g" /etc/containerd/config.toml sed -i "/\[plugins.\"io.containerd.grpc.v1.cri\".registry.mirrors\]/a\ [plugins.\"io.containerd.grpc.v1.cri\".registry.mirrors.\"docker.io\"]" /etc/containerd/config.toml sed -i "/\[plugins.\"io.containerd.grpc.v1.cri\".registry.mirrors.\"docker.io\"\]/a\ endpoint = [\"https://hub-mirror.c.163.com\",\"https://docker.mirrors.ustc.edu.cn\",\"https://registry.docker-cn.com\"]" /etc/containerd/config.toml sed -i "/endpoint = \[\"https:\/\/hub-mirror.c.163.com\",\"https:\/\/docker.mirrors.ustc.edu.cn\",\"https:\/\/registry.docker-cn.com\"]/a\ [plugins.\"io.containerd.grpc.v1.cri\".registry.mirrors.\"registry.k8s.io\"]" /etc/containerd/config.toml sed -i "/\[plugins.\"io.containerd.grpc.v1.cri\".registry.mirrors.\"registry.k8s.io\"\]/a\ endpoint = [\"registry.cn-hangzhou.aliyuncs.com/google_containers\"]" /etc/containerd/config.toml sed -i "/endpoint = \[\"registry.cn-hangzhou.aliyuncs.com\/google_containers\"]/a\ [plugins.\"io.containerd.grpc.v1.cri\".registry.mirrors.\"k8s.gcr.io\"]" /etc/containerd/config.toml sed -i "/\[plugins.\"io.containerd.grpc.v1.cri\".registry.mirrors.\"k8s.gcr.io\"\]/a\ endpoint = [\"registry.cn-hangzhou.aliyuncs.com/google_containers\"]" /etc/containerd/config.toml systemctl daemon-reload systemctl enable containerd && systemctl restart containerd
安装k8s
[blockquote2 name=’洛维花’]官方文档:
https://kubernetes.io/zh/docs/reference/setup-tools/kubeadm/kubeadm-init/
https://kubernetes.io/zh-cn/docs/reference/command-line-tools-reference/kubelet/
[/tip]
- 关闭swap分区或者禁用swap文件
swapoff -a && sed -ri 's/.*swap.*/#&/' /etc/fstab
- 关闭selinux
setenforce 0 && sed -i 's/^SELINUX=enforcing$/SELINUX=permissive/' /etc/selinux/config
- 安装k8s
# 使用阿里云k8s源 cat >/etc/yum.repos.d/kubernetes.repo <<EOF [kubernetes] name=Kubernetes baseurl=https://mirrors.aliyun.com/kubernetes/yum/repos/kubernetes-el7-x86_64/ enabled=1 gpgcheck=0 repo_gpgcheck=0 gpgkey=https://mirrors.aliyun.com/kubernetes/yum/doc/yum-key.gpg https://mirrors.aliyun.com/kubernetes/yum/doc/rpm-package-key.gpg EOF # 安装工具kubelet、kubeadm、kubectl yum install -y kubelet-1.23.17 kubeadm-1.23.17 kubectl-1.23.17 --disableexcludes=kubernetes # 设置驱动方式为systemd cat >/etc/sysconfig/kubelet <<EOF KUBELET_EXTRA_ARGS="--cgroup-driver=systemd" EOF # 设置容器运行时(仅容器运行时为containerd才需要进行以下设置,容器运行时为Docker则不需要) crictl config runtime-endpoint unix:///var/run/containerd/containerd.sock crictl config image-endpoint unix:///var/run/containerd/containerd.sock sed -i '/KUBELET_KUBEADM_ARGS/s/"$/ --container-runtime=remote --container-runtime-endpoint=unix:\/\/\/run\/containerd\/containerd.sock"/' /var/lib/kubelet/kubeadm-flags.env # kubelet开机自启 systemctl enable --now kubelet # 查看kubelet状态 systemctl status kubelet # 如果报错,查询错误信息 journalctl -xe
运行k8s
mkdir -p /k8sdata/log/ kubeadm init \ --apiserver-advertise-address=192.168.56.101 \ --image-repository=registry.cn-hangzhou.aliyuncs.com/google_containers \ --kubernetes-version=v1.23.17 \ --service-cidr=10.96.0.0/12 \ --pod-network-cidr=10.244.0.0/16 | tee /k8sdata/log/kubeadm-init.log mkdir -p "$HOME"/.kube cp -i /etc/kubernetes/admin.conf "$HOME"/.kube/config chown "$(id -u)":"$(id -g)" "$HOME"/.kube/config
提示:
[blockquote2 name=’洛维花’]
1. 如果是搭建的服务器是主节点,则服务器至少2核2G,如果没有达到该配置但是仍想安装,则可以在kubeadm init
命令行中使用–ignore-preflight-errors=CpuNum
即可忽略报错。
2. 如果初始化失败,通过kubeadm reset
进行重设
[/tip]
# 安装网络系统
## flannel
“`
mkdir -p /k8sdata/network/
wget –no-check-certificate -O /k8sdata/network/flannelkube-flannel.yml https://raw.githubusercontent.com/coreos/flannel/master/Documentation/kube-flannel.yml
kubectl create -f /k8sdata/network/flannelkube-flannel.yml
“`
## calico
“`
mkdir -p /k8sdata/network/
wget –no-check-certificate -O /k8sdata/network/calico.yml https://docs.projectcalico.org/manifests/calico.yaml
kubectl create -f /k8sdata/network/calico.yml
“`
# k8s命令行补全
“`
! grep -q kubectl “$HOME/.bashrc” && echo “source /usr/share/bash-completion/bash_completion” >>”$HOME/.bashrc”
! grep -q kubectl “$HOME/.bashrc” && echo “source >”$HOME/.bashrc”
! grep -q kubeadm “$HOME/.bashrc” && echo “source >”$HOME/.bashrc”
! grep -q crictl “$HOME/.bashrc” && echo “source >”$HOME/.bashrc”
source “$HOME/.bashrc”
“`
# k8s常用命令
“`
# 获取节点
kubectl get nodes -o wide
# 实时查询nodes状态
watch kubectl get nodes -o wide
# 获取pod
kubectl get pods –all-namespaces -o wide
# 查看镜像列表
kubeadm config images list
# 节点加入集群
kubeadm token create –print-join-command
# 描述node
kubectl describe node k8s-master
# 描述pod
kubectl describe pod kube-flannel-ds-hs8bq –namespace=kube-flannel
“`
# 总结
按照本教程可以部署一个可以正常运行的k8s,但本文仍存在一些待优化的地方,如在部署或者使用过程中遇到问题会在本文进行补充。
视频备份
百度网盘
[blockquote2 name=’洛维花’]
原文链接:https://jonssonyan.com/2022/07/18/CentOS7%E9%83%A8%E7%BD%B2K8s%E9%9B%86%E7%BE%A4/
[/tip]