第4層「連接被拒絕」與haproxy

Question

我需要一些建議如何設置haproxy。我有兩個Web服務器已啓動並正在運行。爲了測試他們跑在8080端口上

現在我HAProxy的服務器上的一個簡單的節點服務器，我開始HAProxy的，給了我如下：

$> /usr/sbin/haproxy -f /etc/haproxy/haproxy.cfg 
[WARNING] 325/202628 (16) : Server node-backend/server-a is DOWN, reason: Layer4 connection problem, info: "Connection refused", check duration: 0ms. 1 active and 0 backup servers left. 0 sessions active, 0 requeued, 0 remaining in queue. 
[WARNING] 325/202631 (16) : Server node-backend/server-b is DOWN, reason: Layer4 timeout, check duration: 2001ms. 0 active and 0 backup servers left. 0 sessions active, 0 requeued, 0 remaining in queue. 
[ALERT] 325/202631 (16) : backend 'node-backend' has no server available! 

只是一個提醒：如果我做的：

haproxy$> wget server-a:8080 

我得到節點服務器的響應。

這裏是我的haproxy.cfg：

#--------------------------------------------------------------------- 
# Global settings 
#--------------------------------------------------------------------- 
global 
    log   127.0.0.1 local2 

    chroot  /var/lib/haproxy 
    pidfile  /var/run/haproxy.pid 
    maxconn  4000 
    user  haproxy 
    group  haproxy 

    stats socket /var/lib/haproxy/stats 

#--------------------------------------------------------------------- 
# common defaults that all the 'listen' and 'backend' sections will 
# use if not designated in their block 
#--------------------------------------------------------------------- 
defaults 
    mode     tcp 
    log      global 
    option     tcplog 
    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     3000 

#--------------------------------------------------------------------- 
# main frontend which proxys to the backends 
#--------------------------------------------------------------------- 
frontend www 
    bind      *:80 
    default_backend    node-backend 

#--------------------------------------------------------------------- 
# round robin balancing between the various backends 
#-------------------------------------------------------------------- 
backend node-backend 
    balance roundrobin 
    mode tcp 
    server server-a 172.19.0.2:8080 check 
    server server-b 172.19.0.3:8080 check 

如果我刪除check選項它似乎工作。任何建議如何我可以解決這個haproxy的檢查機制？

Answer 1

刪除「mode tcp」並將其更改爲「mode http」。
我只是猜測在這裏，但我想haproxy正在對您的Web服務器做一個tcp檢查，並且Web服務器無法響應它。
在「模式HTTP」它檢查在HTTP模式下的網絡服務器，並需要將L4校驗 「響應200」，我們期望的字符串（不管你定義），爲L7檢查

例如。 L4

backend node-backend balance roundrobin mode http #(NOT NEEDED IF DEFINED IN DEFAULTS) option httpchk server server-a 172.19.0.2:8080 check server server-b 172.19.0.3:8080 check
例如， L7

backend node-backend balance roundrobin mode http #(NOT NEEDED IF DEFINED IN DEFAULTS) option httpchk get /SOME_URI http-check expect status 200 server server-a 172.19.0.2:8080 check server server-b 172.19.0.3:8080 check