
我是這個負載平衡場景的新手,我的任務是找出如何讓這個負載平衡發揮作用。
我的環境:
Centos 6.4 64 Bit
Webserver: Lighttpd
All running in ESXI
virtual IP: 192.168.1.6
LB1: 192.168.1.4
LB2: 192.168.1.5
Webserver 1: 192.168.1.12
Webserver 2: 192.168.1.13
Gateway: 192.168.1.1
嘗試在生產之前使用 HAproxy 和 keepalived 在實驗室中執行測試。這是我的 keepalived 設定:
! keepalived 的設定檔
global_defs {
notification_email {
[email protected]
}
notification_email_from [email protected]
smtp_server 192.168.1.4
smtp_connect_timeout 30
router_id 192.168.1.1
}
vrrp_script chk_haproxy {
script "killall -0 haproxy"
interval 1 # check every second
weight 2 # add 2 points of prio if OK
}
vrrp_instance VI_1 {
state MASTER
interface eth0
virtual_router_id 51
priority 101 #priority 101 for master
advert_int 1
authentication {
auth_type PASS
auth_pass 1111
}
virtual_ipaddress {
192.168.1.6
}
track_script {
chk_haproxy
}
}
這是我對 HAproxy 的設置
#---------------------------------------------------------------------
# Example configuration for a possible web application. See the
# full configuration options online.
#
# http://haproxy.1wt.eu/download/1.4/doc/configuration.txt
#
#---------------------------------------------------------------------
#---------------------------------------------------------------------
# Global settings
#---------------------------------------------------------------------
global
# to have these messages end up in /var/log/haproxy.log you will
# need to:
#
# 1) configure syslog to accept network log events. This is done
# by adding the '-r' option to the SYSLOGD_OPTIONS in
# /etc/sysconfig/syslog
#
# 2) configure local2 events to go to the /var/log/haproxy.log
# file. A line like the following can be added to
# /etc/sysconfig/syslog
#
# local2.* /var/log/haproxy.log
#
log 127.0.0.1 local2
chroot /var/lib/haproxy
pidfile /var/run/haproxy.pid
maxconn 4000
user haproxy
group haproxy
daemon
# turn on stats unix socket
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 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 3000
#---------------------------------------------------------------------
# main frontend which proxys to the backends
#---------------------------------------------------------------------
frontend main *:80
# acl url_static path_beg -i /static /images /javascript /stylesheets
# acl url_static path_end -i .jpg .gif .png .css .js
# use_backend static if url_static
# default_backend view
#---------------------------------------------------------------------
# static backend for serving up images, stylesheets and such
#---------------------------------------------------------------------
#backend static
# balance roundrobin
# server static 127.0.0.1:4331 check
#---------------------------------------------------------------------
# round robin balancing between the various backends
#---------------------------------------------------------------------
backend app
mode tcp
balance roundrobin
server server1 192.168.1.12:80 check inter 2000 rise 2 fall 5
server server2 192.168.1.13:80 check inter 2000 rise 2 fall 5
當我啟動 HAproxy 時,我收到了這個錯誤,但我不太確定從哪裡開始修復它。也許做過很多次這樣的人可以幫助我闡明一些觀點?
503 Service Unavailable No server is available to handle this request.
但是,手動連接到 webserver1 和 webserver2 效果很好。
我想要的只是為位於 HAproxy 後面的網路伺服器提供一個簡單的負載平衡。任何意見或建議都絕對值得讚賞。請幫忙?非常感謝。
答案1
我從未使用過 HAproxy,但快速搜尋讓我認為您需要default_backend app
立即在下面添加frontend main *:80
。我在該配置中看不到將後端和前端連接在一起的地方。
答案2
問題出在您的 HAProxy 配置。當我從您的配置中刪除所有註釋時,我將得到以下資訊:
global
log 127.0.0.1 local2
chroot /var/lib/haproxy
pidfile /var/run/haproxy.pid
maxconn 4000
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 3000
frontend main *:80
backend app
mode tcp
balance roundrobin
server server1 192.168.1.12:80 check inter 2000 rise 2 fall 5
server server2 192.168.1.13:80 check inter 2000 rise 2 fall 5
現在你可以清楚地看到前端根本沒有配置。請求透過 HAProxy 到達,frontend main
但 HAProxy 不知道哪些伺服器可以可靠地處理它,因此將傳回 503。
您必須使用default_backend
acl 將後端連結到前端。
您也應該使用 stats,不僅可以使用套接字,還可以使用受保護的 Web 介面。我可以向您展示有關 haproxy 背後的集群的信息,哪些伺服器離線,哪些伺服器有任何問題,有關響應時間等。對於調試非常有用。