keepalived的应用与安装

keepalived的使用与安装
keepalived主要用作RealServer的健康状态检查以及LoadBalance主机和BackUP主机之间failover的实现。

官方网站
http://www.keepalived.org/

ubuntu安装首先要有gcc,openssl,libpopt-dev,libssl-dev

设置库环境变量
LDFLAGS     linker flags, e.g. -L<lib dir> if you have libraries in a
              nonstandard directory <lib dir>
 
CPPFLAGS    (Objective) C/C++ preprocessor flags, e.g. -I<include dir> if
              you have headers in a nonstandard directory <include dir>


export LDFLAGS="-L/root/openssl-0.9.8x/lib"
export CPPFLAGS="-I/root/openssl-0.9.8x/include"
 
export LD_LIBRARY_PATH=/root/openssl-0.9.8x/lib:$LD_LIBRARY_PATH
 

 
configure: error: Popt libraries is required
【centos】yum install popt-devel
【ubuntu】apt-get install libpopt-dev

./configure --prefix=/root/keepalived-1.2.7
make
make install
【全局，邮件通知可选】
global_defs {
   router_id app_dev
}

【检查，可选】
vrrp_script chk_haproxy {          # Requires keepalived-1.1.13
    script "killall -0 haproxy"   
    interval 1    # check every 10 seconds
    weight -20    # if failed, decrease 40 of the priority
    fall   1      # require 2 failures for failures
    rise   1      # require 1 sucesses for ok
}

【主】
vrrp_instance VI_1 {
    state MASTER    #MASTER/BACKUP
    interface eth1
    virtual_router_id 51  #如果1个配置文件里，配置了多个virtual_ipaddress，则不能一样，例如vrrp_instance ip_253
    priority 150
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress {
        192.168.56.254
    }
#可选
    track_script {
        chk_haproxy
    }
}


vrrp_instance ip_253 {
    state BACKUP
    interface eth1
    virtual_router_id 52
    priority 70
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass open
    }
    virtual_ipaddress {
        192.168.56.253
    }
}
【备】
vrrp_instance VI_1 {
    state BACKUP
    interface eth1
    virtual_router_id 51
    priority 50
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress {
        192.168.56.99
        192.168.56.100
    }
}



【ubuntu增加日志输出】
echo "local0.debug /var/log/keepalived.log">> /etc/rsyslog.conf
重启                                                                                           
service rsyslog stop
service rsyslog start
查看日志
tail -f -n 100 /var/log/keepalived.log

启动
./sbin/keepalived -f /root/keepalived-1.2.7/etc/keepalived/keepalived.conf -D -S 0

-D是让keepalived详细记录log
-d是在日志里打出keepalived读到的配置信息
-S 0是到会将日志发送给syslog，且日志定为LOCAL0

附录
安装错误调试参考
http://www.ttlsa.com/html/299.html

# 包扫描
export PKG_CONFIG_PATH=$PKG_CONFIG_PATH:/root/openssl-0.9.8x/lib/pkgconfig

共享库解决参考
http://blog.sina.com.cn/s/blog_54f82cc201011ve4.html



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