构建高可用服务器之一 Keepalive介绍及安装
Keepalived 是一个基于VRRP协议来实现的LVS服务高可用方案，可以利用其来避免单点故障。一个mysql或lvs或nginx服务会有2台服务器运行Keepalived，一台为主服务器（MASTER），一台为备份服务器（BACKUP），但是对外表现为一个虚拟IP，主服务器会发送特定的消息给备份服务器，当备份服务器收不到这个消息的时候，即主服务器宕机的时候，备份服务器就会接管虚拟IP，继续提供服务，从而保证了高可用性。以下简图为例，当服务调用mysql的时候，直接调用vip，这样即使master上宕机，依旧可访问从数据库。Keepalive的安装：
1、安装环境包
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# yum-yinstallkernel-devel openssl-develpopt-devel
2、安装keepalive
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#wget http://www.keepalived.org/software/keepalived-1.1.15.tar.gz
# tarkeepalived-1.1.15.tar.gz
# cd keepalived-1.1.15
#./configure--with-kernel-dir=/usr/src/kernels/2.6.32-431.el6.x86_64/
# make && makeinstall
3、设置keepalive
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# DIR=/usr/local/ ; cp$DIR/etc/rc.d/init.d/keepalived /etc/rc.d/init.d/
# cp $DIR/etc/sysconfig/keepalived/etc/sysconfig/ && mkdir -p /etc/keepalived
# cp $DIR/sbin/keepalived/usr/sbin/
# cp/usr/local/etc/keepalived/keepalived.conf /etc/keepalived/
# /etc/init.d/keepalivedrestart
Stopping keepalived:
Starting keepalived:
#
Other
脚本配置文件：
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# chmod +xinstall_keepalive.sh
# cat install_keepalive.sh
#!/bin/bash
yum -yinstallkernel-devel openssl-develpopt-devel &&
wgethttp://www.keepalived.org/software/keepalived-1.1.15.tar.gz &&
tar keepalived-1.1.15.tar.gz &&
cd keepalived-1.1.15 &&
./configure--with-kernel-dir=/usr/src/kernels/2.6.32-431.el6.x86_64/ &&
make && make install &&
DIR=/usr/local/
cp $DIR/etc/rc.d/init.d/keepalived/etc/rc.d/init.d/&&
cp $DIR/etc/sysconfig/keepalived/etc/sysconfig/ && mkdir -p /etc/keepalived &&
cp $DIR/sbin/keepalived /usr/sbin/&&
cp/usr/local/etc/keepalived/keepalived.conf /etc/keepalived/ &&
/etc/init.d/keepalived restart
if [ $? -eq 0 ];then
echo -e '\e[32mInstall Keepalive Successfully!\e[0m'
else
echo -e '\e[31mInstall Keepalive Failure!\e[0m'
fi
#
其实这个不算是什么脚本，方便安装而已，内容在附件当中！
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