keepalived+haproxy实现高可用

cat /etc/haproxy/haproxy.cfg

你会看到默认配置文件。

首先更改日志到本地日志系统里面去。由于centos 6.5使用的是rsyslog，所以vi /etc/sysconfig/rsyslog

更改为：

SYSLOGD_OPTIONS="-c 5 -r"

然后重启rsyslog

[root@ha3 ~]# service rsyslog restart

关闭系统日志记录器：                                       [确定]

启动系统日志记录器：-r option only supported in compatibility modes 0 to 2 - ignored

提示错误，将5改成2，使用兼容模式。

然后在/etc/rsyslog.conf里面添加：  local2.*                       /var/log/haproxy.log进去，并且要启

# Provides UDP syslog reception

$ModLoad imudp

$UDPServerRun 514这两个参数。

用重启rsyslog ：service rsyslog restart

.更改后配置文件如下：

[root@ha1 ~]# cat /etc/haproxy/haproxy.cfg

global

    chroot      /var/lib/haproxy

    pidfile     /var/run/haproxy.pid

    maxconn     4000

    user        haproxy

    group       haproxy

    daemon

    log         127.0.0.1 local2

    # 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 http

        mode http

        bind *:80

        option httpclose

        option logasap

        option  dontlognull

        capture request header Host len 20

        capture request header Referer len 60

        default_backend servers

backend servers

        balance roundrobin

        server websrv1 192.168.8.21:80 check maxconn 2000

        server websrv2 192.168.8.22:80 check maxconn 2000

        server websrv3 192.168.8.23:80 check maxconn 2000

[root@ha1 ~]#service haproxy start

启动haproxy，则用curl 127.0.0.1 多用几次则可以发现在调度。

默认配置文件：

[root@ha1 ~]# cat /etc/haproxy/haproxy.cfg

#---------------------------------------------------------------------

# 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 *:5000

    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             app

#---------------------------------------------------------------------

# 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

    balance     roundrobin

    server  app1 127.0.0.1:5001 check

    server  app2 127.0.0.1:5002 check

    server  app3 127.0.0.1:5003 check

    server  app4 127.0.0.1:5004 check

[root@ha1 ~]#

ha1:

ha3:

[root@ha1 ~]# cat /etc/keepalived/keepalived.conf

! Configuration File for keepalived

global_defs {

   notification_email {

     acassen@firewall.loc

     failover@firewall.loc

     sysadmin@firewall.loc

   }

   notification_email_from Alexandre.Cassen@firewall.loc

   smtp_server 192.168.200.1

   smtp_connect_timeout 30

   router_id LVS_DEVEL

}

vrrp_instance keepalived {

    state MASTER

    interface eth1

    virtual_router_id 51

    priority 100

    advert_int 1

    authentication {

        auth_type PASS

        auth_pass 1111

    }

    virtual_ipaddress {

        192.168.8.199/24

    }

}

[root@ha1 ~]#

[root@ha3 ~]# cat /etc/keepalived/keepalived.conf

! Configuration File for keepalived

global_defs {

   notification_email {

     acassen@firewall.loc

     failover@firewall.loc

     sysadmin@firewall.loc

   }

   notification_email_from Alexandre.Cassen@firewall.loc

   smtp_server 192.168.200.1

   smtp_connect_timeout 30

   router_id LVS_DEVEL

}

vrrp_instance keepalived {

    state BACKUP

    interface eth1

    virtual_router_id 51

    priority 90

    advert_int 1

    authentication {

        auth_type PASS

        auth_pass 1111

    }

    virtual_ipaddress {

        192.168.8.199/24

    }

}

[root@ha3 ~]#