集群利器Keepalived
keepalived 是一个类似于 layer3,4&5 交换机制的软件，也就是我们平时说的第 3 层、第 4 层和第 5层交换。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 Keepalived 自动将web 服务器加入到服务器群中，这些工作全部自动完成，不需要人工干涉，需要人工做的只是修复故障的=========================================================================================以下例举一配置实例：//因为keepalived在配置HA时候需要读系统内核，但redhat安装时候不存在，所以需要自行安装，如下：# yum -y install kernel-devel --nogpgcheck# yum -y install openssl-devel --nogpgcheckln -sv /usr/src/kernels/2.6.18-308.13.1.el5-x86_64/ /usr/src/linux1、安装# tar –zxvf keepalived-1.2.7.tar.gz#cd keepalived-1.2.7# ./configure--prefix=/u01/keepalived --sysconf=/etc --with-kernel-dir=/usr/src/linux
//注意：在检查配置的时候，需要看到:Keepalived configuration
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Keepalived version : 1.1.17
Compiler : gcc
Compiler flags : -g -O2
Extra Lib : -lpopt -lssl -lcrypto
Use IPVS Framework : Yes # 支持lvs
IPVS sync daemon support : Yes
Use VRRP Framework : Yes
Use LinkWatch : No
Use Debug flags : No
# make && make install2、设置开机启动# cp /u01/keepalived/sbin/keepalived/usr/sbin/keepalived3、配置keepalived参数文件1)主服务器 keepalived配置//参数文件keepalived.conf位于安装目录下：/etc/keepalived!Confinguration File for keepalivedglobal_defs {notification_email {root@localhost --根据情况修改}notification_email_from root@localhostsmtp_server 127.0.0.1router_id mysql_ha}vrrp_instance VL_1 {state BACKUPinterface eth0virtual_router_id 50priority 150advert_int 1 nopreemptauthentication {auth_type PASSauth_pass 1111}virtual_ipaddress {192.168.101.88 #主从服务器虚拟ip}}
2)从服务器 keepalived配置//参数文件keepalived.conf位于安装目录下：/etc/keepalived!Confinguration File for keepalivedglobal_defs {notification_email {root@localhost}notification_email_from root@localhostsmtp_server 127.0.0.1router_id mysql_ha}vrrp_instance VL_1 {state BACKUPinterface eth0virtual_router_id 50priority 100advert_int 1authentication {auth_type PASSauth_pass 1111}virtual_ipaddress {192.168.101.88}}3)启动Keepaviled的服务# /u01/keepalived/sbin/keepalived-D
4) 设置开机启动Root用户修改rc.lcoal(vi/etc/rc.d/rc.local ) 增加如下配置: sleep2/etc/init.d/keepalived start
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