9.2 KiB
9.2 KiB
本文作者:丁辉
Rke1部署Kubernetes集群
节点名称 | IP | Kubernetes角色 |
---|---|---|
k8s-master-1,Rke管理 | 192.168.1.10 | controlplane,etcd,worker |
k8s-master-2 | 192.168.1.20 | controlplane,etcd,worker |
k8s-master-3 | 192.168.1.30 | controlplane,etcd,worker |
环境准备
!!!每次部署都写挺麻烦的索性都放在一个文件内了请查看 Kubernetes基础环境准备 ,请按照此文档初始化环境
所有节点执行
-
配置 SSH
sed -i 's/#AllowTcpForwarding yes/AllowTcpForwarding yes/g' /etc/ssh/sshd_config
重启 SSH
systemctl restart sshd
-
将用户添加到 docker 组
groupadd docker useradd -m docker -g docker
使用其他用户
useradd rke # 创建用户 usermod -aG docker rke 将rke用户加入docker组
-
配置 docker 用户免密登录
mkdir -p /home/docker/.ssh/ touch /home/docker/.ssh/authorized_keys chmod 700 /home/docker/.ssh/ chown -R docker.docker /home/docker/.ssh/ chmod 600 /home/docker/.ssh/authorized_keys
Rke管理节点执行
-
生成密钥
ssh-keygen -t rsa -N "" -f ~/.ssh/id_rsa -q
-
查看主节点密钥
密钥需要到 RKE 初始化节点上获取,所有节点都是用此密钥
cat ~/.ssh/id_rsa.pub
所有节点执行
-
粘贴密钥内容到此文件内(提示:所有节点粘贴Rke管理节密钥)
vi /home/docker/.ssh/authorized_keys
-
验证是否可以免密登录
ssh docker@192.168.1.10
Docker安装
-
Docker安装
curl https://releases.rancher.com/install-docker/20.10.sh | sh
传递参数使用国内源
curl -fsSL https://releases.rancher.com/install-docker/20.10.sh | sh -s -- --mirror Aliyun
-
启动 Docker
systemctl enable docker systemctl start docker
安装并初始化Rke
-
下载 RKE 二进制文件,并添加到可执行路径下
wget https://github.com/rancher/rke/releases/download/v1.4.10/rke_linux-amd64
-
授权
chmod 777 rke_linux-amd64 && mv rke_linux-amd64 /usr/local/bin/rke
方法一 (不推荐怪麻烦的请看"方法二")
如果
Number of Hosts
填的是多节点则会提示输入多次节点信息
rke config --name cluster.yml
[+] Cluster Level SSH Private Key Path [~/.ssh/id_rsa]: #默认回车
[+] Number of Hosts [1]: #节点数量
[+] SSH Address of host (1) [none]: 192.168.1.10 #节点IP地址
[+] SSH Port of host (1) [22]: #默认回车
[+] SSH Private Key Path of host (192.168.1.10) [none]: #默认回车
[-] You have entered empty SSH key path, trying fetch from SSH key parameter
[+] SSH Private Key of host (192.168.1.10) [none]: #默认回车
[-] You have entered empty SSH key, defaulting to cluster level SSH key: ~/.ssh/id_rsa
[+] SSH User of host (192.168.1.10) [ubuntu]: docker #SSH用户
[+] Is host (192.168.1.10) a Control Plane host (y/n)? [y]: y #是否为控制节点
[+] Is host (192.168.1.10) a Worker host (y/n)? [n]: y #是否为计算节点
[+] Is host (192.168.1.10) an etcd host (y/n)? [n]: y #是否为etcd节点
[+] Override Hostname of host (192.168.1.10) [none]: #默认回车
[+] Internal IP of host (192.168.1.10) [none]: 192.168.1.10 #主机内部IP
[+] Docker socket path on host (192.168.1.10) [/var/run/docker.sock]: #默认回车
[+] Network Plugin Type (flannel, calico, weave, canal, aci) [canal]: flannel #选择网络插件类型
[+] Authentication Strategy [x509]: #默认回车
[+] Authorization Mode (rbac, none) [rbac]: #默认回车
[+] Kubernetes Docker image [rancher/hyperkube:v1.26.8-rancher1]: #选择 k8s 版本
[+] Cluster domain [cluster.local]: #集群域
[+] Service Cluster IP Range [10.43.0.0/16]: #服务集群IP范围
[+] Enable PodSecurityPolicy [n]: #默认回车
[+] Cluster Network CIDR [10.42.0.0/16]: #集群网络CIDR
[+] Cluster DNS Service IP [10.43.0.10]: #集群DNS服务IP
[+] Add addon manifest URLs or YAML files [no]: #默认回车
基础参数修改
sed -i '/^ingress:$/,/^ provider:/ s/provider: ""/provider: "none"/' cluster.yml
方法二
-
生成初始文件
rke config --empty --name cluster.yml
-
按需要修改 address 参数
多节点则写多个
address
并通过调整 role 指定节点属性nodes: - address: 192.168.1.10 port: "22" internal_address: 192.168.1.10 role: - controlplane #管理 - worker #计算 - etcd #etcd节点 hostname_override: "" user: docker docker_socket: /var/run/docker.sock ssh_key: "" ssh_key_path: ~/.ssh/id_rsa ssh_cert: "" ssh_cert_path: "" labels: {} taints: [] # 格式一样此处省略 20,30 节点配置 ... services: ...
-
基础参数修改
sed -i 's/service_cluster_ip_range: ""/service_cluster_ip_range: 10.43.0.0\/16/' cluster.yml sed -i 's/cluster_cidr: ""/cluster_cidr: 10.42.0.0\/16/' cluster.yml sed -i 's/cluster_domain: ""/cluster_domain: cluster.local/' cluster.yml sed -i 's/cluster_dns_server: ""/cluster_dns_server: 10.43.0.10/' cluster.yml sed -i 's/plugin: ""/plugin: flannel/' cluster.yml sed -i 's/strategy: ""/strategy: x509/' cluster.yml sed -i 's/^\s*mode: ""$/ mode: rbac/' cluster.yml sed -i '/^ingress:$/,/^ provider:/ s/provider: ""/provider: "none"/' cluster.yml sed -i '/^[^ ]/ s/ssh_key_path: ""/ssh_key_path: ~\/.ssh\/id_rsa/g' cluster.yml sed -i '0,/^\s*ssh_key_path: ""$/{s,^\s*ssh_key_path: ""$, ssh_key_path: ~/.ssh/id_rsa,}' cluster.yml
初始化 Kubernetes 集群
rke up
禁用 metrics-server 组件
sed -i '/^monitoring:$/,/^ provider:/ s/provider: ""/provider: "none"/' cluster.yml
调整节点端口范围
默认端口范围:30000-32767
sed -i 's/service_node_port_range: ""/service_node_port_range: "10000-30000"/' cluster.yml
关闭 Docker 版本检测
sed -i 's/ignore_docker_version: null/ignore_docker_version: true/' cluster.yml
调整部署版本
- 查看当前 RKE 支持的Kubernetes版本
rke config --list-version --all
- 替换版本
sed -i 's/kubernetes_version: ""/kubernetes_version: "v1.24.17-rancher1-1"/' cluster.yml
更新集群
rke up --update-only
安装 kubectl
-
下载 kubectl
curl -LO https://dl.k8s.io/release/v1.26.8/bin/linux/amd64/kubectl
-
授权
chmod 777 kubectl && mv kubectl /usr/local/bin/
-
添加 kubctl 文件
mkdir ~/.kube && cp kube_config_cluster.yml ~/.kube/config && chmod 600 ~/.kube/config
-
验证
kubectl get node
本文中没有禁用
monitoring
所以也可以使用kubectl top node
测试
卸载
-
卸载 RKE 集群
rke remove
-
清理残余容器
for i in $(docker ps -a | grep rancher | awk '{print $1}');do docker rm -f $i;done for i in $(docker ps -a | grep rke | awk '{print $1}');do docker rm -f $i;done
-
清除 Docker 引擎的废弃资源和缓存
docker system prune --all
-
卸载挂载
mount | grep /var/lib/kubelet/pods/ | awk '{print $1}' | xargs umount -l
-
删除持久化目录
rm -rf /var/lib/kubelet/ rm -rf /run/flannel/
备份和恢复
非常重要,他奶奶的吃大亏了
创建一次性快照
RKE 会将节点快照保存在
/opt/rke/etcd-snapshots
路径下
rke etcd snapshot-save --config cluster.yml --name <快照名称>
恢复集群
rke etcd snapshot-restore --config cluster.yml --name <快照名称>
恢复 Rke配置文件
准备依赖
jq
Centos
yum install jq -y
Ubuntu
apt install jq -y
-
恢复 Kubectl 配置文件
修改
--master-ip=
为任意 K8S Master节点IPcurl -sfL https://gitee.com/offends/Kubernetes/raw/main/File/Shell/restore-rkestate-kubeconfig.sh | bash -s -- --master-ip=<K8S Master节点IP>
-
恢复 rkestate 状态文件
-
通过本地 kubectl 找回
kubectl get configmap -n kube-system full-cluster-state -o json | jq -r .data.\"full-cluster-state\" | jq -r . > cluster.rkestate
-
通过 master 节点找回
curl -sfL https://gitee.com/offends/Kubernetes/raw/main/File/Shell/restore-rkestate-config.sh | bash -s
-