负载均衡器最好也部署成高可用（主/备），可参考本文中的nginx高可用部分内容 https://cloud.tencent.com/developer/article/1633991

1.配置 nginx官方的 Yum 源

负载均衡需要stream模块，所以本次安装最新1.18版本nginx

vim /etc/yum.repos.d/nginx.repo

添加如下内容：

[nginx]
name=nginx repo
baseurl=http://nginx.org/packages/centos/$releasever/$basearch/
gpgcheck=0
enabled=1

2.安装最新 nignx

yum -y install nginx

3.配置 nginx

[root@rancher-slb ~]# cd /etc/nginx
[root@rancher-slb ~]# rm -rf conf.d
[root@rancher-slb ~]# mv nginx.conf nginx.conf.bak

创建nginx.conf

[root@rancher-slb ~]# vim /etc/nginx/nginx.conf

把下面内容加入

worker_processes 4;
worker_rlimit_nofile 40000;

events {
    worker_connections 8192;
}

stream {
    upstream rancher_servers_http {
        least_conn;
        server 172.16.7.201:80 max_fails=3 fail_timeout=5s;
        server 172.16.7.202:80 max_fails=3 fail_timeout=5s;
        server 172.16.7.203:80 max_fails=3 fail_timeout=5s;
    }
    server {
        listen 80;
        proxy_pass rancher_servers_http;
    }

    upstream rancher_servers_https {
        least_conn;
        server 172.16.7.201:443 max_fails=3 fail_timeout=5s;
        server 172.16.7.202:443 max_fails=3 fail_timeout=5s;
        server 172.16.7.203:443 max_fails=3 fail_timeout=5s;
    }
    server {
        listen     443;
        proxy_pass rancher_servers_https;
    }

}

4.启动 nginx

systemctl start nginx && systemtl enable nginx

5.打开防火墙端口

80/443

----------------------其它,下面内容不需要安装---------------------------------------------

1、在nginx机器安装helm

1.1 helm安装包下载

https://github.com/helm/helm/releases 在页的Installation and Upgrading下（如图），复制下载链接或直接点击下载 https://get.helm.sh/helm-v3.4.1-linux-amd64.tar.gz

1.2 在线下载并安装

[root@rancher0 ~]# wget https://get.helm.sh/helm-v3.4.1-linux-amd64.tar.gz \
&&   tar xf helm-v3.0.3-linux-amd64.tar.gz  \
&&   cd linux-amd64 \
&&   mv helm  /usr/sbin/