[root@localhost ~]# hostnamectl set-hostname backup
[root@localhost ~]# bash
[root@backup ~]# vim /etc/selinux/config  //关闭防火墙
SELINUX=disabled
[root@backup ~]# setenforce 0
[root@backup ~]# systemctl disable --now firewalld.service 
Removed /etc/systemd/system/multi-user.target.wants/firewalld.service.
Removed /etc/systemd/system/dbus-org.fedoraproject.FirewallD1.service.
[root@backup ~]# dnf -y install wget
[root@backup ~]# cd /etc/yum.repos.d/
[root@backup yum.repos.d]# wget -O /etc/yum.repos.d/CentOS-Base.repo https://mirrors.aliyun.com/repo/Centos-vault-8.5.2111.repo
//配置阿里源
[root@backup yum.repos.d]#sed -i -e '/mirrors.cloud.aliyuncs.com/d' -e '/mirrors.aliyuncs.com/d' /etc/yum.repos.d/CentOS-Base.repo
[root@backup yum.repos.d]# ls
CentOS-Base.repo
[root@backup yum.repos.d]# cd
[root@backup ~]# useradd -rMs /sbin/nologin haproxy
//创建用户
[root@backup ~]# dnf -y install make gcc pcre-devel bzip2-devel openssl-devel systemd-devel  vim
//下载依赖包
[root@backup ~]# wget https://src.fedoraproject.org/repo/pkgs/haproxy/haproxy-2.6.0.tar.gz/sha512/7bb70bfb5606bbdac61d712bc510c5e8d5a5126ed8827d699b14a2f4562b3bd57f8f21344d955041cee0812c661350cca8082078afe2f277ff1399e461ddb7bb/haproxy-2.6.0.tar.gz
//下载haproxy压缩包
[root@backup ~]# ls
anaconda-ks.cfg  haproxy-2.6.0.tar.gz
[root@backup ~]# tar -xf haproxy-2.6.0.tar.gz  //解压
[root@backup ~]# cd haproxy-2.6.0/
[root@backup haproxy-2.6.0]# make -j $(grep 'processor' /proc/cpuinfo |wc -l)  \
> TARGET=linux-glibc  \
> USE_OPENSSL=1  \
>  USE_ZLIB=1  \
> USE_PCRE=1  \
> USE_SYSTEMD=1
[root@backup haproxy-2.6.0]# make install PREFIX=/usr/local/haproxy
//安装
[root@backup haproxy-2.6.0]# cp haproxy /usr/sbin/
//复制命令到/usr/sbin目录下
[root@backup haproxy-2.6.0]# cd
[root@backup ~]# vim /etc/sysctl.conf
net.ipv4.ip_nonlocal_bind = 1
net.ipv4.ip_forward = 1
[root@backup ~]# sysctl -p
net.ipv4.ip_nonlocal_bind = 1
net.ipv4.ip_forward = 1
//修改内核参数,等于号前后都要空格
[root@backup ~]# vim /etc/haproxy/haproxy.cfg //修改配置文件
[root@backup ~]# cat /etc/haproxy/haproxy.cfg
global
    daemon
    maxconn 256
 
defaults
    mode http
    timeout connect 5000ms
    timeout client 50000ms
    timeout server 50000ms
 
frontend http-in
    bind *:80
    default_backend servers
 
backend servers
    server web01 192.168.222.138:80
    server web02 192.168.222.139:80
[root@backup ~]# vim /usr/lib/systemd/system/haproxy.service
[root@backup ~]# cat /usr/lib/systemd/system/haproxy.service
[Unit]
Description=HAProxy Load Balancer
After=syslog.target network.target
 
[Service]
ExecStartPre=/usr/local/haproxy/sbin/haproxy -f /etc/haproxy/haproxy.cfg   -c -q
ExecStart=/usr/local/haproxy/sbin/haproxy -Ws -f /etc/haproxy/haproxy.cfg  -p /var/run/haproxy.pid
ExecReload=/bin/kill -USR2 $MAINPID
 
[Install]
WantedBy=multi-user.target
//编写service文件
[root@backup ~]# systemctl daemon-reload 
[root@backup ~]# systemctl start haproxy.service 
//启动服务
[root@backup ~]# ss -antl
State      Recv-Q     Send-Q          Local Address:Port           Peer Address:Port     Process     
LISTEN     0          128                   0.0.0.0:22                  0.0.0.0:*                    
LISTEN     0          128                   0.0.0.0:80                  0.0.0.0:*                    
LISTEN     0          128                      [::]:22                     [::]:*  
[root@backup ~]# curl 192.168.222.137
RS1
[root@backup ~]# curl 192.168.222.137
RS2
[root@backup ~]# curl 192.168.22