方法2：TCP的KeepAl

本文的目录如下：一、keepalived原理介绍二、部署keepalived作为web服务器的HA三、脚本实现监控httpd服务一、keepalived原理介绍1）keepal

本文的目录如下：一、keepalived原理介绍二、部署keepalived作为web服务器的HA三、脚本实现监控httpd服务一、keepalived原理介绍1）keepal

它的作用除了可以检测rs状态外，还可以检测备用director的状态，也就是说keepal

它的作用除了可以检测rs状态外，还可以检测备用director的状态，也就是说keepal

httpd2.4新特性：  MPM支持运行DOS机制；  支持eventMPM；  支持异步读写；  支持每模块及每个目录分别使用各自的日志级别；  每请求配置；  增强版的表达式分析器；  支持毫秒级的keepal

IPVS通常与keepal

nbsp; 如果你愿意可以更新下系统，更换下yum源. 1.安装keepalive 官方最新版  keepalived-1.2.7  tar zxvf keepal

 echo 1800 > /proc/sys/net/ipv4/tcp_keepalive_time echo 15 > /proc/sys/net/ipv4/tcp_keepal

1.2.15 1.2检查keepalived所需要的依赖包是否已经安装#rpm-qa|greppopt   //（安装keepalived需要popt支持）#rpm-qa|grepopenssl  //（安装keepal

/software/keepalived-1.2.9.tar.gztar  -xf keepalived-1.2.9.tar.gz mkdir /usr/local/keepalived cd ~/ keepal

172.16.0.0/16网段，并且该接口为内网RS的网关；eth1为外网192.168.1.0/24网段，为外网客户端的网关（nod55）为MASTER调度器，DIP为172.16.13.55/16，keepal

Hostnameeth0DR1192.168.137.100DR2192.168.137.101RS1192.168.137.111RS2192.168.137.122准备工作：1、ipvsadm -C    setenforce 0     iptables �CF2、vip地址以192.168.137.88为例3、DR1以及DR2上需要安装keepal

Hostnameeth0DR1192.168.137.100DR2192.168.137.101RS1192.168.137.111RS2192.168.137.122准备工作：1、ipvsadm -C    setenforce 0     iptables �CF2、vip地址以192.168.137.88为例3、DR1以及DR2上需要安装keepal

Configuration File for keepalived vrrp_script chk_haproxy {          script "/etc/keepal

tcp_keepalive_time = 7200 net.ipv4.tcp_keepalive_probes = 9 net.ipv4.tcp_keepalive_intvl = 75 上文中的keepal

它的作用除了可以检测rs状态外，还可以检测备用director的状态，也就是说keepal

它的作用除了可以检测rs状态外，还可以检测备用director的状态，也就是说keepal

10.0.200.88，状态：backup，优先级85 备：10.0.200.89，状态：backup，优先级75 vip：10.0.200.90 2）配置文件举例【主】： [root@200-80 keepal

10.10.0.220)keepalived、nginxRealServer1（apache1）10.10.0.225httpdRealServer2（apache2）10.10.0.221httpd一、安装keepal

10.10.0.220)keepalived、nginxRealServer1（apache1）10.10.0.225httpdRealServer2（apache2）10.10.0.221httpd一、安装keepal

一、在lvs-server安装ipvsadm和keepal

本文则详细介绍如何利用它的四层交换与Keepal

方法2：TCP的KeepAl

然后使用的以下操作命令    cp /usr/local/etc/rc.d/init.d/keepal

方法2：TCP的KeepAl

IPServer1Centos192.168.18.20192.168.18.22Server2Centos192.168.18.21192.168.18.221.安装Keepalived2台Server都使用下面的命令安装Keepalived：yum install keepal

/configure--prefix=/usr/local/keepalived  make makeinstall 所设keepal

环境：  keepalived+win2008R2*21、配置keepal

Keepalived的作用是检测web服务器的状态，如果有一台web服务器死机，或工作出现故障，Keepalived将检测到，并将有故障的web服务器从系统中剔除，当web服务器工作正常后Keepal

/configure prefix=/usr/local/keepalived Keepalived configuration------------------------Keepal

Keepalived的作用是检测web服务器的状态，如果有一台web服务器死机，或工作出现故障，Keepalived将检测到，并将有故障的web服务器从系统中剔除，当web服务器工作正常后Keepal

配置ipvsadm(Master/Backup)5、配置RealServer二、安装环境：1、CentOS6(LinuxKernel2.6.32-71.el6.i686)2、ipvsadm1.2.43、keepal

1024; } http { include mime.types; default_type application/octet-stream; sendfile on; keepal

拯救步骤1：查看日志/端口的状态登录进入交换机后，执行showlog，会看到如下的提示：21w6d:%ETHCNTR-3-LOOP_BACK_DETECTED:Keepal

拯救步骤1：查看日志/端口的状态登录进入交换机后，执行showlog，会看到如下的提示：21w6d:%ETHCNTR-3-LOOP_BACK_DETECTED:Keepal

1、LVS+Keepal

#netstat-antp|grep-itime_wait|wc-l查看TIME_WAIT数量，如果数量过多，并且Resin前端还有Nginx或者Apache，那么请把socket-timeout、keepal

二．简单原理NGINX_MASTER、NGINX_BACKUP两台服务器均通过keepal

&&exit   echo"Keepal

我们利用LVS+Keepal

1、LVS+Keepal

1、系统高可用性2、 系统可扩展性3、 负载均衡能力LVS+keepal

KeepAlive参数 KeepAl