基于rancher的k8s集群搭建

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声明:本文转自 https://blog.csdn.net/chen978616649/article/details/104067772 ,只对其进行了一定的排版,具体内容可靠性未做验证。

生产环境k8s集群方案主要由以下四部分组成

  • 1、F5 ,rancher ui及业务服务访问入口,所有域名访问解析到此F5
  • 2、nginx,k8s集群业务服务访问入口、HA负载
  • 3、rancher ui,k8s可视化管理平台
  • 4、k8s集群

整体架构图:

准备:

  • 1、所有主机节点开通外网访问权限
  • 2、申请https://k8s-pro.jieyue.com rancher ui 域名解析
  • 3、申请xxx.k8spro.jieyue.com 业务服务 域名解析
  • 4、k8s相关命令文件地址:http://172.16.101.32/stgconfig/soft

一、安装环境

1、硬件环境

节点IPOS角色配置
nginx-115172.19.101.115centos7.6nginx2C,4G,100G
nginx-116172.19.101.116centos7.6nginx2C,4G,100G
rancher-117172.19.101.117centos7.6rancher server4C,8G,100G
rancher-134172.19.101.134centos7.6rancher server4C,8G,100G
k8s-135172.19.101.135centos7.6controlplane,etcd,worker4C,16G,300G
k8s-136172.19.101.136centos7.6controlplane,etcd,worker4C,16G,300G
k8s-137172.19.101.137centos7.6controlplane,etcd,worker4C,16G,300G
f5-138172.19.101.138f5
f5-140172.19.101.140f5

2、软件环境

  • 1、os:centos7.6
  • 2、rancher:2.3.2
  • 3、docker:17.03.2-ce , overlay2存储,extfs 文件系统

二、安装前的准备

1、主机环境配置

1.1、 关闭防火墙
sudo systemctl stop firewalld.service && sudo systemctl disable firewalld.service
1.2、关闭setlinx
sudo sed -i 's/SELINUX=enforcing/SELINUX=disabled/g' /etc/selinux/config
1.3、关闭swap

注释或删除swap交换分区:vi /etc/fstab

#/dev/mapper/centos-swap swap swap defaults 0 0
1.4、配置主机时间、时区、系统语言
sudo  ln -sf /usr/share/zoneinfo/Asia/Shanghai /etc/localtime
sudo echo 'LANG="en_US.UTF-8"' >> /etc/profile;source /etc/profile
1.5、修改最大进程数 、 用户进程打开文件数
echo '1000000' > /proc/sys/kernel/pid_max

vim  /etc/sysctl.conf  

kernel.pid_max=1000000

# 保存生效
sysctl -p  

 vi /etc/security/limits.conf
 *          soft    nproc     102400                                                                                                                                        
 *          hard    nofile    65535                                                                                                                                         
 jyapp      hard    nofile    102400                                                                                                                                        
 jyapp      soft    nofile    102400                                                                                                                                        
 jyapp      soft    nproc     102400                                                                                                                                        
 root       soft    nproc     unlimited                                                                                                                                     
 root       soft    nofile    102400                                                                                                                                        
 root       hard    nofile    102400
1.6、Kernel性能调优

vi /etc/sysctl.conf 并追加一下内容:

net.ipv4.ip_forward=1
net.bridge.bridge-nf-call-iptables=1
net.ipv4.neigh.default.gc_thresh1=4096
net.ipv4.neigh.default.gc_thresh2=6144
net.ipv4.neigh.default.gc_thresh3=8192

2、安装docker-ce并配置

2.1、添加用户(可选)
sudo adduser jyapp
2.2、为新用户设置密码
sudo passwd jyapp
2.3、为新用户添加sudo权限
sudo echo 'jyapp ALL=(ALL) ALL' >> /etc/sudoers
2.4、jyapp加用docker用户组
sudo usermod -a -G docker jyapp
2.5、编辑 daemon.json 文件
vi /etc/docker/daemon.json
{
	"bip":"172.25.100.1/24"
	,"insecure-registries":["172.16.101.43:5000","172.16.101.49","10.50.182.85","docker.jieyue.com"]
	,"registry-mirrors": ["http://172.16.101.49","http://10.50.182.85","http://docker.jieyue.com","https://088aunhx.mirror.aliyuncs.com"]
	
	,"log-driver": "json-file"
	,"log-opts": {
	"max-size": "100m",
	"max-file": "3"
	}
	,"max-concurrent-downloads": 10
	,"max-concurrent-uploads": 10
	,"storage-driver": "overlay2"
	,"storage-opts": ["overlay2.override_kernel_check=true"]
}
2.6、刷新配置重启 docker 服务
systemctl daemon-reload
systemctl restart docker

3、下载命令行工具

下载 kubectlrkehelm172.19.101.135 /usr/local/bin 下。
命令工具下载地址:http://172.16.101.32/stgconfig/soft/raw/master/k8s-kub.tar.gz

cd /usr/local/bin

#赋可执行权限
sudo chmod +x *

#修改profile
sudo vi /etc/profile

#追加
export PATH="/usr/local/bin:$PATH"

#保存退出,使之生效
sudo source /etc/profile

4、免密登录

在172.19.101.135用 jyapp 用户执行:

ssh-keygen -t rsa
ssh-copy-id -p 10022 -i ~/.ssh/id_rsa.pub jyapp@172.19.101.135
ssh-copy-id -p 10022 -i ~/.ssh/id_rsa.pub jyapp@172.19.101.136
ssh-copy-id -p 10022 -i ~/.ssh/id_rsa.pub jyapp@172.19.101.137

三、rke安装k8s

1、配置rke 创建rancher-cluster.yml文件
 nodes:

    - address: 172.19.101.135
      user: jyapp
      role: [controlplane,worker,etcd]
      port: 10022
    - address: 172.19.101.136
      user: jyapp
      role: [controlplane,worker,etcd]
      port: 10022
    - address: 172.19.101.137
      user: jyapp
      role: [controlplane,worker,etcd]
      port: 10022
services:
    etcd:
       backup_config:
           enabled: true
           interval_hours: 6
           retention: 12
       extra_args:
           quota-backend-bytes: '4294967296'
    kubelet:
       cluster_domain: cluster.local
       cluster_dns_server: 10.43.0.10
       fail_swap_on: true
       extra_args:
          max-pods: 50
          kube-api-burst: '100'
          kube-api-qps: '100'
         #enforce-node-allocatable: 'pods'
         #system-reserved: 'cpu=1,memory=4000Mi'
         #kube-reserved: 'cpu=1,memory=4000Mi'
    kube-controller:
         cluster_cidr: 10.42.0.0/16
         service_cluster_ip_range: 10.43.0.0/16
         extra_args:
             node-cidr-mask-size: '24'
    kube-api:
         service_cluster_ip_range: 10.43.0.0/16
         service_node_port_range: 30000-32767
         pod_security_policy: false
         always_pull_images: false
2、运行RKE命令
rke up --config rancher-cluster.yml

完成后,它应显示:Finished building Kubernetes cluster successfully。

在本目录会生成config文件:kube_config_rancher-cluster.yml

如若操作失败,重新安装需要清理数据:

su - root
rm -rf /var/lib/rancher/etcd/*
rm -rf /etc/kubernetes/*
su - jyapp
rke remove --config ./rancher-cluster.yml
3、测试集群
mkdir ~/.kube
cp kube_config_rancher-cluster.yml  ~/.kube/config
kubectl get cs
NAME                          STATUS    MESSAGE    ERROR
controller-manager       Healthy        ok 
scheduler                      Healthy        ok 
etcd-0                           Healthy {"health": "true"} 
etcd-2                           Healthy {"health": "true"} 
etcd-1                           Healthy {"health": "true"}
kubectl get node
NAME                STATUS        ROLES                   AGE               VERSION
172.19.101.135   Ready  controlplane,etcd,worker 20d                 v1.13.5
172.19.101.136    Ready  controlplane,etcd,worker 20d                v1.13.5
172.19.101.137   Ready  controlplane,etcd,worker 20d                 v1.13.5

四、安装 rancher server

1、分别在172.19.101.117、172.19.101.134上执行
docker run -d --restart=unless-stopped \\
-p 80:80 -p 443:443 \\
-v 
/var/lib/rancher/:/var/lib/rancher/ \\
-v /root/var/log/auditlog:/var/log/auditlog \\
-e CATTLE_SYSTEM_CATALOG=bundled \\
-e AUDIT_LEVEL=3 \\
rancher/rancher:v2.3.2

访问:https://172.19.101.117

注:ui初始登录时需指访问地址为 k8s-pro.jieyue.com

2、通过rancher ui导入 rke k8s集群

五、 配置nginx

1、sudo vi /etc/nginx/nginx.conf

user nginx;
worker_processes 4;

error_log /var/log/nginx/error.log warn;

worker_rlimit_nofile 40000;

events {
worker_connections 8192;
}

http {

      upstream rancher_web{
            server 172.19.101.135:80;
            server 172.19.101.136:80;
           server 172.19.101.137:80;
      }
      server {

            listen 80 default_server;
            server_name _;
            access_log logs/busiweb.access.log main;

            client_max_body_size 300m;
            client_body_buffer_size 128k;
            proxy_connect_timeout 600;
            proxy_read_timeout 600;
            proxy_send_timeout 600;
            proxy_buffer_size 64k;
            proxy_buffers 4 32k;
            proxy_busy_buffers_size 64k;
            proxy_temp_file_write_size 64k;

            location / {
                  proxy_set_header Host $host;
                  proxy_set_header X-Real-IP $remote_addr;
                  proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;

                 proxy_pass http://rancher_web;
            }

      }

}

2、 或可以容器化nginx代替以上安装

下载附件nginx.tar.gz 并解压

略作修改:按上面nginx.conf 修改

执行 sh startNginx-80.sh 即可


其他

需开通网络访问权限

日志收集 elk

监控 promethus

配置和连接镜像仓库 harbor

根据需要可以构建本地 (dnsmasq | coredns)


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