rke高可用k8s集群安装和实现手册

一、环境基础要求

软件环境：下表为rke安装k8s集群需要的软件环境

软件	版本
操作系统system	Centos7.9
Docker	20.10.20
k8s	1.25.9
rke	1.4.5
Docker Compose	v2.18.1

主机、ip、角色

主机名称	ip地址	角色
master01	192.168.149.200	Controlplane、rancher、rke
master02	192.168.149.201	Controlplane
Worker01	192.168.149.205	Worker
Worker02	192.168.149.206	Worker
etcd01	192.168.149.210	Etcd

硬件要求

l Cpu：最低要求cpu为2核；内存：4GB；硬盘：100GB以上

l Cpu和内存比列为：1：2或者1：4

l 要求能访问外网

l 禁止swap分区

二、软件基础配置

集群主机名配置

# hostnamectl set-hostname XXX

配置静态ip地址

# vi /etc/sysconfig/network-scripts/ifcfg-ens33

TYPE="Ethernet"

PROXY_METHOD="none"

BROWSER_ONLY="no"

BOOTPROTO="none"

DEFROUTE="yes"

IPV4_FAILURE_FATAL="no"

IPV6INIT="yes"

IPV6_AUTOCONF="yes"

IPV6_DEFROUTE="yes"

IPV6_FAILURE_FATAL="no"

IPV6_ADDR_GEN_MODE="stable-privacy"

NAME="ens33"

UUID="a80f81c1-928c-4fc8-83c1-73366be7d684"

DEVICE="ens33"

ONBOOT="yes"

IPADDR="192.168.149.200"

PREFIX="24"

GATEWAY="192.168.149.2"

DNS1="192.168.149.2"

IPV6_PRIVACY="no"

实现主机名与ip地址解析

# vi /etc/hosts

192.168.149.200 master01

192.168.149.201 master02

192.168.149.205 worker01

192.168.149.206 worker02

192.168.149.210 etcd01

配置ip_forward过滤机制

# vi /etc/sysctl.conf

net.ipv4.ip_forward=1

net.bridge.bridge-nf-call-ip6tables=1

net.bridge.bridge-nf-call-iptables=1

# modprobe br_netfilter

# sysctl -p

关闭防火墙

# systemctl stop firewalld

# systemctl disable firewalld

# systemctl status firewalld

# firewall-cmd --state

Swap分区的设置

# sed -ri ‘s/.*swap/#&/’ /etc/fstab

# swapoff -a

# free -m

时间同步

# yum -y install update

# crontab -e

0 */1 * * * ntpdate ntp.aliyun.com

# crontab -l

关闭selinux

# sed -ri ‘s/SELINUX=enforcing/SELINUX=disable/’ /etc/selinux/config

# setenforce 0

# sestatus

三、docker部署

配置docker yum源：这里使用的清华yum源，每一台集群机器都需要做

如果你之前安装过 docker，请先删掉

# yum remove docker docker-client docker-client-latest docker-common docker-latest docker-latest-logrotate docker-logrotate docker-engine

# yum install -y yum-utils device-mapper-persistent-data lvm2

# yum-config-manager --add-repo https://download.docker.com/linux/centos/docker-ce.repo

# sed -i 's+https://download.docker.com+https://mirrors.tuna.tsinghua.edu.cn/docker-ce+' /etc/yum.repos.d/docker-ce.repo

# yum makecache fast

安装docker ce：每一台集群机器都需要做

# yum install -y docker-ce-20.10.22 docker-cli-20.10.22 containerd.io

启用docker ce：每一台集群机器都需要做

# systemctl enable docker

# systemctl start docker

# docker version

配置docker镜像加速：每一台集群机器都需要做

# vi /etc/docker/daemon.json

{

"registry-mirrors":["https://81v7jdo5.mirror.aliyuncs.com"]

}

docker-compose安装:

无法上网用户可以直接去github下载，然后上传操作；下载地址为：https://github.com/docker/compose/releases/download/v2.18.1/docker-compose-linux-x86_64

# curl -L “https://github.com/docker/compose/releases/download/2.18.1/docker-compose-`uname -s`-`uname -m` -O /usr/local/bin/docker-compose

# chmod +x /usr/local/bin/docker-compose

# ln -s /usr/local/bin/docker-compose /usr/bin/docker-compose

# docker-compose --version

添加rancher用户:每一台集群机器都需要做建立rancher用户

# useradd rancher

# usermod -aG docker rancher

# echo 123 | passwd --stdin rancher

生成ssh证书：每一台集群机器都需要做

# ssh-keygen

Generating public/private rsa key pair.

Enter file in which to save the key (/root/.ssh/id_rsa):

Created directory '/root/.ssh'.

Enter passphrase (empty for no passphrase):

Enter same passphrase again:

Your identification has been saved in /root/.ssh/id_rsa.

Your public key has been saved in /root/.ssh/id_rsa.pub.

The key fingerprint is:

SHA256:AgWS6I15+VqbrW70wI4qCP+G2r5hMbkqmq9lkbC66zQ root@master01

The key's randomart image is:

+---[RSA 2048]----+

| ...... |

|. .. . |

|o + o |

| * * . |

|. B o . S |

|o = * . |

|+E*.* * |

|=O++.= o |

|&O*++o. |

+----[SHA256]-----+

复制证书到所有主机:只在管理机器上做

# ssh-copy-id rancher@master01

# ssh-copy-id rancher@master02

# ssh-copy-id rancher@worker01

# ssh-copy-id rancher@worker02

# ssh-copy-id rancher@etcd01

rke工具下载和安装

如果本机无法访问rke，需要下载，下载地址：https://github.com/rancher/rke/releases/download/v1.4.5/rke_linux-amd64；

rke支持版本Kubernetes version为：v1.25.9-rancher2-1 (Default)、v1.24.13-rancher2-1、v1.23.16-rancher2-2

# wget https://github.com/rancher/rke/releases/download/v1.4.5/rke_linux-amd64

# mv rke_linux-amd64 /usr/local/bin/rke

# chmod +x /usr/local/bin/rke

# ln -s /usr/local/bin/rke /usr/bin/rke

# rke --version

rke安装k8s集群产生的配置文件

#mkdir -p /app/rancher

# rke config --name cluster.yml

[+] Cluster Level SSH Private Key Path [~/.ssh/id_rsa]: 集群私钥路径：~/.ssh/id_rsa

[+] Number of Hosts [1]: 3 集群拥有几个节点：3

[+] SSH Address of host (1) [none]: 192.168.149.200 第一个节点ip地址：192.168.149.200

[+] SSH Port of host (1) [22]: 22 第一个节点端口：22

[+] SSH Private Key Path of host (192.168.149.200) [none]: ~/.ssh/id_rsa 第一个节点私钥路径：~/.ssh/id_rsa

[+] SSH User of host (192.168.149.200) [ubuntu]: rancher 远程用户名：rancher

[+] Is host (192.168.149.200) a Control Plane host (y/n)? [y]: y 是否是k8s集群控制节点：y

[+] Is host (192.168.149.200) a Worker host (y/n)? [n]: n 是否是k8s集群工作节点：n

[+] Is host (192.168.149.200) an etcd host (y/n)? [n]: n 是否是k8s集群etcd节点：n

[+] Override Hostname of host (192.168.149.200) [none]: 不覆盖现有主机：回车默认

[+] Internal IP of host (192.168.149.200) [none]: 主机局域网地址：没有更改回车默认

[+] Docker socket path on host (192.168.149.200) [/var/run/docker.sock]: /var/run/docker.sock 主机上docker.sock路径：/var/run/docker.sock

[+] SSH Address of host (2) [none]: 192.168.149.205 第二个节点ip地址：192.168.149.205

[+] SSH Port of host (2) [22]: 22 第二个节点远程端口：22

[+] SSH Private Key Path of host (192.168.149.205) [none]: ~/.ssh/id_rsa 第二个节点私钥路径：~/.ssh/id_rsa

[+] SSH User of host (192.168.149.205) [ubuntu]: rancher 第二个节点远程用户名：rancher

[+] Is host (192.168.149.205) a Control Plane host (y/n)? [y]: n 是否是k8s集群控制节点：n

[+] Is host (192.168.149.205) a Worker host (y/n)? [n]: y 是否是k8s集群工作节点：y

[+] Is host (192.168.149.205) an etcd host (y/n)? [n]: n 是否是k8s集群etcd节点：n

[+] Override Hostname of host (192.168.149.205) [none]: 不覆盖现有主机：回车默认

[+] Internal IP of host (192.168.149.205) [none]: 主机局域网地址：没有更改回车默认

[+] Docker socket path on host (192.168.149.205) [/var/run/docker.sock]: /var/run/docker.sock 主机上docker.sock路径：/var/run/docker.sock

[+] SSH Address of host (3) [none]: 192.168.149.210 第三个节点ip地址：192.168.149.210

[+] SSH Port of host (3) [22]: 22 第三个节点远程端口：22

[+] SSH Private Key Path of host (192.168.149.210) [none]: ~/.ssh/id_rsa 第三个节点私钥路径：~/.ssh/id_rsa

[+] SSH User of host (192.168.149.210) [ubuntu]: rancher 第三个节点远程用户名：rancher

[+] Is host (192.168.149.210) a Control Plane host (y/n)? [y]: n 是否是k8s集群控制节点：n

[+] Is host (192.168.149.210) a Worker host (y/n)? [n]: n 是否是k8s集群工作节点：n

[+] Is host (192.168.149.210) an etcd host (y/n)? [n]: y 是否是k8s集群etcd节点：y

[+] Override Hostname of host (192.168.149.210) [none]: 不覆盖现有主机：回车默认

[+] Internal IP of host (192.168.149.210) [none]: 主机局域网地址：没有更改回车默认

[+] Docker socket path on host (192.168.149.210) [/var/run/docker.sock]: /var/run/docker.sock 主机上docker.sock路径：/var/run/docker.sock

[+] Network Plugin Type (flannel, calico, weave, canal, aci) [canal]: calico 网络插件类型：自选，我选择的是calico

[+] Authentication Strategy [x509]: 认证策略形式：X509

[+] Authorization Mode (rbac, none) [rbac]: rbac 认证模式：rbac

[+] Kubernetes Docker image [rancher/hyperkube:v1.25.9-rancher2]: rancher/hyperkube:v1.25.9-rancher2 k8s集群使用的docker镜像：rancher/hyperkube:v1.25.9-rancher2

[+] Cluster domain [cluster.local]: sbcinfo.com 集群域名：默认即可

[+] Service Cluster IP Range [10.43.0.0/16]: 集群IP、server地址：默认即可

[+] Enable PodSecurityPolicy [n]: 开启pod安全策略：n

[+] Cluster Network CIDR [10.42.0.0/16]: 集群pod ip地址：默认即可

[+] Cluster DNS Service IP [10.43.0.10]: 集群DNS ip地址：默认即可

[+] Add addon manifest URLs or YAML files [no]: 添加加载项清单url或yaml文件：回车默认即可或者no

四、docker集群部署

1．集群部署

# rke up

2．安装kubectl客户端管理工具

这里选择Kubernetes version为kubectl v1.27.2

下载地址为：curl -LO https://dl.k8s.io/release/v1.27.2/bin/linux/amd64/kubectl

# wget https://storage.googleapis.com/kubernetes-release/release/v1.27.2/bin/linux/amd64/kubectl

# chmod +x kubectl

# mv kubectl /usr/local/bin

# kubectl version --client

3．Kubectl客户端管理工具配置和应用的验证

集群创建过程中，会形成两个文件，一个是cluster.rkestate状态文件、另外一个文件是kube_config_cluster.yml入口文件

[root@master01 rancher]# ll

总用量 132

-rw------- 1 root root 108380 5月 27 12:19 cluster.rkestate

-rw-r----- 1 root root 6579 5月 27 12:09 cluster.yml

-rw------- 1 root root 5504 5月 27 12:16 kube_config_cluster.yml

# ls /app/rancher

# mkdir ./.kube

# cp /app/rancher/kube_config_cluster.yml /root/.kube/config

[root@master01 ~]# kubectl get nodes

NAME STATUS ROLES AGE VERSION

192.168.3.100 Ready controlplane 38m v1.25.9

192.168.3.105 Ready worker 38m v1.25.9

192.168.3.110 Ready etcd 38m v1.25.9

[root@master01 ~]# kubectl get pods -n kube-system

NAME READY STATUS RESTARTS AGE

calico-kube-controllers-5b5d9f577c-lsnk8 1/1 Running 0 38m

calico-node-gb9zt 1/1 Running 0 38m

calico-node-sk4vg 1/1 Running 0 38m

calico-node-whfzz 1/1 Running 0 38m

coredns-autoscaler-74d474f45c-g6sf6 1/1 Running 0 38m

coredns-dfb7f8fd4-smpc4 1/1 Running 0 38m

metrics-server-c47f7c9bb-98th2 1/1 Running 0 38m

rke-coredns-addon-deploy-job-rm8bt 0/1 Completed 0 38m

rke-ingress-controller-deploy-job-v2x6d 0/1 Completed 0 38m

rke-metrics-addon-deploy-job-m8lq2 0/1 Completed 0 38m

rke-network-plugin-deploy-job-nm6kk 0/1 Completed 0 38m

4．使用docker run启动一个reancher

# docker run -d --privileged -p 80:80 -p 443:443 -v /opt/data/rancher_data:/var/lib/rancher --restart=always --name rancher-2-7-0 rancher/rancher:v2.7.0

# docker ps

# ss -anput | grep “ :80”

tcp LISTEN 0 128 *:80 *:* users:(("docker-proxy",pid=59286,fd=4))

tcp LISTEN 0 128 [::]:80 [::]:* users:(("docker-proxy",pid=59294,fd=4))

4.1、设置网页登录的密码，docker下查询密码，然后自己重新输入密码

# docker logs container-id 2>&1 | grep "Bootstrap Password:"

# docker logs 9190a38d7627 2>&1 | grep "Bootstrap Password:"

2023/05/27 05:13:05 [INFO] Bootstrap Password: wknrt6mjxf8k8xgk7p5fcks66r8smhr9f7vqkmtsnzrrxx46skxc9b

4.2、进入网页后，导入集群设置

#curl --insecure -sfL https://192.168.3.100/v3/import/5grbvcxd6qlxnjx4q29rswcgpgsgfrjvs5m4sxbxqbbbhz5g9l4jl2_c-m-r4qd797g.yaml | kubectl apply -f –

# kubectl get ns

5．增加worker节点

①　增加主机名称

②　IP地址配置

③　主机与IP地址解析配置

④　配置ip_forward过滤机制

⑤　防火墙配置

⑥　Selinux配置

⑦　Swap分区设置

⑧　Docker源配置

⑨　安装docker并启动

⑩　配置Docker镜像加速

⑪　安装docker compose

⑫　添加rancher用户，并加入docker组

⑬　复制证书到这台机器，并验证

⑭　修改cluster.yml文件

⑮　使用rke up --update-only更新集群

6．启动一个项目验证

# vi nginx.yml

apiversion：apps/v1

kind: Deployment

metadata:

name: nginx-test

spec:

selector:

matchlables:

app: nginx

env: test

owner: rancher

replicas: 2

template:

metadata:

labels:

app: nginx

env: test

owner: rancher

spec:

contaiers:

- name: nginx-test

image: nginx:1.19.9

ports:

- contaiersPort: 80

# kubectl apply -f nginx.yml

# vi nginx-service.yml

apiversion：v1

kind: Service

metadata:

name: nginx-test

labels:

run: nginx

spec:

type: NodePort

ports:

- port: 80

protocol: tcp

selector:

owner: rancher

# kubectl apply -f nginx-service.yml

# kubectl get pods -o wide

posted @ 2023-06-13 10:42 雨夜清风 Views(952) Comments(0) Edit 收藏举报

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雨夜清风

rke高可用k8s集群安装和实现手册

一、环境基础要求

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