我的haproxy.cfg是：
global
chroot /var/lib/haproxy
pidfile /var/run/haproxy.pid
maxconn 4096
user haproxy
group haproxy
daemon
stats socket /var/lib/haproxy/stats
defaults
option forwardfor
log global
option httplog
log 127.0.0.1 local3
option dontlognull
retries 3
option redispatch
timeout connect 5000ms
timeout client 5000ms
timeout server 5000ms
listen stats
bind *:9000
mode http
..................................
..............................................
backend testhosts
mode http
balance roundrobin
option tcplog
option tcp-check
# cookie SERVERID
option httpchk HEAD /sabrix/scripts/menu-common.js
server host1 11.11.11.11:9080 check cookie host1
server host2 22.22.22.22:9080 check cookie host2
日志显示：
2020-08-19T16:02:14+08:00 localhost haproxy[22439]: Server Host2 is DOWN, reason: Layer7 timeout, check duration: 2000ms. 1 active and 0 backup servers left. 0 sessions active, 0 requeued, 0 remaining in queue.
2020-08-19T16:02:14+08:00 localhost haproxy[22439]: Server Host2 is DOWN, reason: Layer7 timeout, check duration: 2000ms. 1 active and 0 backup servers left. 0 sessions active, 0 requeued, 0 remaining in queue.
2020-08-19T16:02:18+08:00 localhost haproxy[12706]: Server Host2 is DOWN, reason: Layer7 timeout, check duration: 2001ms. 1 active and 0 backup servers left. 0 sessions active, 0 requeued, 0 remaining in queue.
2020-08-19T16:02:19+08:00 localhost haproxy[12706]: Server Host2 is DOWN, reason: Layer7 timeout, check duration: 2000ms. 1 active and 0 backup servers left. 0 sessions active, 0 requeued, 0 remaining in queue.
2020-08-19T16:02:27+08:00 localhost haproxy[12706]: Server Host2 is UP, reason: Layer7 check passed, code: 200, info: "OK", check duration: 138ms. 2 active and 0 backup servers online. 0 sessions requeued, 0 total in queue.
2020-08-19T16:02:30+08:00 localhost haproxy[22439]: Server Host2 is UP, reason: Layer7 check passed, code: 200, info: "OK", check duration: 1ms. 2 active and 0 backup servers online. 0 sessions requeued, 0 total in queue.
2020-08-19T16:02:30+08:00 localhost haproxy[22439]: Server Host2 is UP, reason: Layer7 check passed, code: 200, info: "OK", check duration: 1ms. 2 active and 0 backup servers online. 0 sessions requeued, 0 total in queue.
2020-08-19T16:02:30+08:00 localhost haproxy[12706]: Server Host2 is UP, reason: Layer7 check passed, code: 200, info: "OK", check duration: 0ms. 2 active and 0 backup servers online. 0 sessions requeued, 0 total in queue.
at that time（ when the host is marked as down）， the call result will be 504 error rather than 200.
2020-08-19T20:16:02+08:00 localhost haproxy[3774]: 39898 22.22.22.22 504 POST /url/services
2020-08-19T20:16:02+08:00 localhost haproxy[3774]: 39909 11.11.11.11 200 POST /url/services
我的问题：我已经将超时设置为5000ms，为什么当后端服务器#2的响应时间超过2000ms时会报告错误？我可以增加超时来删除错误吗？
我相信您正在寻找超时检查
如果"超时检查"；没有设置haproxy使用"；inter"；进行全面检查超时(连接+读取(
如果未指定，inter默认为2000毫秒。