[root@localhost ~]# cat /etc/os-release 
NAME="CentOS Linux"
VERSION="7 (Core)"
ID="centos"
ID_LIKE="rhel fedora"
VERSION_ID="7"
PRETTY_NAME="CentOS Linux 7 (Core)"
ANSI_COLOR="0;31"
CPE_NAME="cpe:/o:centos:centos:7"
HOME_URL="https://www.centos.org/"
BUG_REPORT_URL="https://bugs.centos.org/"

CENTOS_MANTISBT_PROJECT="CentOS-7"
CENTOS_MANTISBT_PROJECT_VERSION="7"
REDHAT_SUPPORT_PRODUCT="centos"
REDHAT_SUPPORT_PRODUCT_VERSION="7"

[root@localhost ~]# uname -r
3.10.0-957.10.1.el7.x86_64

[root@localhost ~]# tar zxvf haproxy-1.8.20.tar.gz

[root@localhost ~]# yum install -y gcc
或者
[root@localhost ~]# yum install gcc gcc-c++ glibc glibc-devel pcre pcre-devel openssl  openssl-devel systemd-devel net-tools vim iotop bc  zip unzip zlib-devel lrzsz tree screen lsof tcpdump wget

[root@localhost ~]# cd haproxy-1.8.20

[root@localhost ~]# make TARGET=linux2628 PREFIX=/usr/local/haproxy #haproxy编译需要指定对应的内核版本，此参数可以查看README文件中有对应的值linux2628

[root@localhost ~]# make install

[root@localhost ~]# cp

[root@localhost ~]# haproxy -v
HA-Proxy version 1.8.20 2019/04/25
Copyright 2000-2019

[root@localhost ~]# mkdir /usr/local/haproxy/conf
[root@localhost ~]# vim /usr/local/haproxy/conf/haproxy.conf

global
        daemon
        maxconn 256

    defaults
        mode http
        timeout connect 5000ms
        timeout client 50000ms
        timeout server 50000ms

    frontend http-in
        bind *:80
        default_backend web_servers

    backend web_servers
        server server1 127.0.0.1:8000 maxconn 32

[root@localhost ~ ] haproxy -f /usr/local/haproxy/conf/haproxy.conf