HAProxy可以实现 TCP 负载均衡

1. 关闭防火墙

   systemctl stop firewalld
   systemctl disable firewalld
   

2. 修改 SELINUX

   setenforce 0
   sed -i 's/^SELINUX=enforcing$/SELINUX=permissive/' /etc/selinux/config
   

3. 安装 haproxy

   yum install -y haproxy
   

4. 修改 haproxy 配置

   cat <<EOF > /etc/haproxy/haproxy.cfg
   global
       log         127.0.0.1 local2
   
       chroot      /var/lib/haproxy
       pidfile     /var/run/haproxy.pid
       maxconn     65000
       user        haproxy
       group       haproxy
       daemon
   
       stats socket /var/lib/haproxy/stats
   
   defaults
       mode                    http
       log                     global
       option                  httplog
       option                  dontlognull
       option http-server-close
       option forwardfor       except 127.0.0.0/8
       option                  redispatch
       retries                 3
       timeout http-request    10s
       timeout queue           1m
       timeout connect         10s
       timeout client          1m
       timeout server          1m
       timeout http-keep-alive 10s
       timeout check           10s
       maxconn                 65000
   
   
   frontend tcp_master_frontend
       bind                    *:26443
       mode                    tcp
       log                     global
       option                  tcplog
       timeout client          60s
       maxconn                 65000
       default_backend         tcp_master_backend
   
   backend tcp_master_backend
       mode                    tcp
       option                  tcplog
       option                  log-health-checks
       balance                 roundrobin
       timeout queue           5s
       timeout connect         1s
       timeout server          60s
       server  master01        192.168.1.108:6443 check
       server  master02        192.168.1.110:6443 check
       server  master03        192.168.1.109:6443 check
   EOF
   

5. 注册 haproxy 为自动服务

   systemctl daemon-reload
   systemctl enable haproxy
   systemctl restart haproxy
   

6. 检查 haproxy 启动状态

   systemctl staus haproxy
     ● haproxy.service - HAProxy Load Balancer
       Loaded: loaded (/usr/lib/systemd/system/haproxy.service; enabled; vendor preset: disabled)
       Active: active (running) since Sat 2019-07-20 17:44:23 CST; 888ms ago