haproxy

部署haproxy

主机名称	IP地址	需要安装的应用	系统版本
LB	192.168.142.130	haproxy	centos 8
RS1	192.168.142.131	httpd	centos 8
RS2	192.168.142.132	httpd	centos 8
client	192.168.142.133	无	centos 8

1.源码部署haproxy

//安装编译环境
[root@LB ~]# yum -y install make gcc pcre-devel bzip2-devel openssl-devel systemd-devel --allowerasing

//创建haproxy用户
[root@LB ~]# useradd -r -M -s /sbin/nologin haproxy

//下载，解压和安装
[root@LB ~]# wget https://src.fedoraproject.org/repo/pkgs/haproxy/haproxy-2.1.3.tar.gz/sha512/4728c1177b2bba69465cbc56b1ed73a1b2d36891ba2d94d29bb49714ad98ccfac4b52947735aded211f0cd8070002f5406ddd77cabd2f8230b00438189dd7a60/haproxy-2.1.3.tar.gz
[root@LB ~]# tar -xzf haproxy-2.1.3.tar.gz 
[root@LB ~]# cd haproxy-2.1.3
[root@LB haproxy-2.1.3]# make clean
[root@LB haproxy-2.1.3]# make -j $(grep 'processor' /proc/cpuinfo |wc -l)  \
> TARGET=linux-glibc  \
> USE_OPENSSL=1  \
> USE_ZLIB=1  \
> USE_PCRE=1  \
> USE_SYSTEMD=1
[root@LB haproxy-2.1.3]# make install PREFIX=/usr/local/haproxy
[root@LB haproxy-2.1.3]# cp haproxy  /usr/sbin/

//设置Linux内核参数
[root@LB haproxy-2.1.3]# vim /etc/sysctl.conf
net.ipv4.ip_forward = 1
net.ipv4.ip_nonlocal_bind = 1
[root@LB haproxy-2.1.3]# sysctl -p
net.ipv4.ip_forward = 1
net.ipv4.ip_nonlocal_bind = 1

//配置haproxy服务
[root@LB haproxy-2.1.3]# mkdir /etc/haproxy
[root@LB haproxy-2.1.3]# vim /etc/haproxy/haproxy.cfg
global
    log 127.0.0.1 local0  info
    #log loghost local0 info
    maxconn 20480
#chroot /usr/local/haproxy
    pidfile /var/run/haproxy.pid
    #maxconn 4000
    user haproxy
    group haproxy
    daemon
#---------------------------------------------------------------------
#common defaults that all the 'listen' and 'backend' sections will
#use if not designated in their block
#---------------------------------------------------------------------
defaults
    mode http
    log global
    option dontlognull
    option httpclose
    option httplog
    #option forwardfor
    option redispatch
    balance roundrobin
    timeout connect 10s
    timeout client 10s
    timeout server 10s
    timeout check 10s
    maxconn 60000
    retries 3
#--------------统计页面配置------------------
listen admin_stats
    bind 0.0.0.0:8189
    stats enable
    mode http
    log global
    stats uri /haproxy_stats
    stats realm Haproxy\ Statistics
    stats auth admin:admin
    #stats hide-version
    stats admin if TRUE
    stats refresh 30s
#---------------web设置-----------------------
listen webcluster
    bind 0.0.0.0:80
    mode http
    #option httpchk GET /index.html
    log global
    maxconn 3000
    balance roundrobin
    cookie SESSION_COOKIE insert indirect nocache
    server web01 192.168.142.131:80 check inter 2000 fall 5
    #server web01 192.168.142.132:80 cookie web01 check inter 2000 fall 5

//启动haproxy，配置haproxy.service服务单元文件
[root@LB ~]# vim /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
[root@LB ~]# systemctl daemon-reload

//配置日志信息
[root@LB ~]# vim /etc/rsyslog.conf
local0.*        /var/log/haproxy.log
[root@LB ~]# systemctl enable --now rsyslog
[root@LB ~]# systemctl restart rsyslog
[root@LB ~]# systemctl enable --now haproxy
[root@LB ~]# systemctl restart haproxy

2.Haproxy搭建http负载均衡

//LB、RS1、RS2都关闭防火墙和selinux
//RS1和RS2部署httpd
#RS1
[root@RS1 ~]# yum -y install httpd
[root@RS1 ~]# echo RS1 > /var/www/html/index.html
[root@RS1 ~]# systemctl enable --now httpd
#RS2
[root@RS2 ~]# yum -y install httpd
[root@RS2 ~]# echo RS2 > /var/www/html/index.html
[root@RS2 ~]# systemctl enable --now httpd
//修改LB的内核参数
[root@LB ~]# vim /etc/sysctl.conf
net.ipv4.ip_nonlocal_bind = 1
net.ipv4.ip_forward = 1
[root@LB ~]# sysctl -p
net.ipv4.ip_nonlocal_bind = 1
net.ipv4.ip_forward = 1

//修改haproxy配置文件
[root@LB ~]# vim /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 192.168.142.131:80
    server web02 192.168.142.132:80
    
[root@LB ~]# systemctl restart haproxy

//客户端验证
[root@client ~]# curl http://192.168.142.130
RS1
[root@client ~]# curl http://192.168.142.130
RS2
[root@client ~]# curl http://192.168.142.130
RS1
[root@client ~]# curl http://192.168.142.130
RS2

//使用WEB网页访问测试
[root@LB ~]# vim /etc/haproxy/haproxy.cfg
global
    log 127.0.0.1 local0  info
    #log loghost local0 info
    maxconn 256
#chroot /usr/local/haproxy
    pidfile /var/run/haproxy.pid
    #maxconn 4000
    user haproxy
    group haproxy
    daemon
#---------------------------------------------------------------------
#common defaults that all the 'listen' and 'backend' sections will
#use if not designated in their block
#---------------------------------------------------------------------
defaults
    mode http
    log global
    option dontlognull
    option httpclose
    option httplog
    #option forwardfor
    option redispatch
    balance roundrobin
    timeout connect 5000ms
    timeout client 50000ms
    timeout server 50000ms
    timeout check 10s
    maxconn 60000
    retries 3
#--------------统计页面配置------------------
listen admin_stats
    bind 0.0.0.0:8189
    stats enable
    mode http
    log global
    stats uri /haproxy_stats
    stats realm Haproxy\ Statistics
    stats auth admin:admin
    #stats hide-version
    stats admin if TRUE
    stats refresh 30s
#---------------web设置-----------------------
listen webcluster
    bind 0.0.0.0:80
    mode http
    #option httpchk GET /index.html
    log global
    maxconn 3000
    balance roundrobin
    cookie SESSION_COOKIE insert indirect nocache
    server web01 192.168.142.131:80 check inter 2000 fall 5
    server web02 192.168.142.132:80 cookie web01 check inter 2000 fall 5
[root@LB ~]# systemctl restart haproxy
[root@LB ~]# ss -anlt
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                                0.0.0.0:8189                            0.0.0.0:*                                
LISTEN           0                128                                0.0.0.0:80                              0.0.0.0:*                                
LISTEN           0                128                                   [::]:22                                 [::]:*