Keepalived安装与配置

Keepalived工作原理是VRRP，所以只能在同一局域网的主机中使用

Ipvs(IP Virtual Server)是整个负载均衡的基础，如果没有这个基础，故障隔离与失败切换就毫无意义了。

先安装ipvsadm

yum -y install ipvsadm

执行

ipvsadm

只有执行ipvsadm以后，才会在内核加载ip_vs模块。

检查当前加载的内核模块，看是否存在ip_vs模块
lsmod|grep ip_vs

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wget www.keepalived.org/software/keepalived-1.3.5.tar.gz

tar -zxvf keepalived-1.3.5.tar.gz

cd keepalived-1.3.5

./configure --prefix=/usr/local/keepalived

系统提示警告 *** WARNING - this build will not support IPVS with IPv6. Please install libnl/libnl-3 dev libraries to support IPv6 with IPVS.

yum -y install libnl libnl-devel

再次执行

./configure --prefix=/usr/local/keepalived

系统提示错误 configure: error: libnfnetlink headers missing

yum install -y libnfnetlink-devel

再次执行

./configure --prefix=/usr/local/keepalived

make && make install

配置成服务

cp /usr/local/keepalived/etc/sysconfig/keepalived /etc/sysconfig/

mkdir /etc/keepalived

使用软连接或者直接拷贝执行文件
ln -s /usr/local/keepalived/sbin/keepalived /usr/sbin/
 
或者cp /usr/local/keepalived/sbin/keepalived /usr/sbin/


#加入开机启动项

vi /etc/init.d/keepalived

keepalived脚本内容如下

#!/bin/sh## keepalived   High Availability monitor built upon LVS and VRRP## chkconfig:   - 86 14# description: Robust keepalive facility to the Linux Virtual Server project \#              with multilayer TCP/IP stack checks.### BEGIN INIT INFO# Provides: keepalived# Required-Start: $local_fs $network $named $syslog# Required-Stop: $local_fs $network $named $syslog# Should-Start: smtpdaemon httpd# Should-Stop: smtpdaemon httpd# Default-Start: # Default-Stop: 0 1 2 3 4 5 6# Short-Description: High Availability monitor built upon LVS and VRRP# Description:       Robust keepalive facility to the Linux Virtual Server#                    project with multilayer TCP/IP stack checks.### END INIT INFO# Source function library.. /etc/rc.d/init.d/functionsexec="/usr/sbin/keepalived"prog="keepalived"config="/etc/keepalived/keepalived.conf"[ -e /etc/sysconfig/$prog ] && . /etc/sysconfig/$proglockfile=/var/lock/subsys/keepalivedstart() {    [ -x $exec ] || exit 5    [ -e $config ] || exit 6    echo -n $"Starting $prog: "    daemon $exec $KEEPALIVED_OPTIONS    retval=$?    echo    [ $retval -eq 0 ] && touch $lockfile    return $retval}stop() {    echo -n $"Stopping $prog: "    killproc $prog    retval=$?    echo    [ $retval -eq 0 ] && rm -f $lockfile    return $retval}restart() {    stop    start}reload() {    echo -n $"Reloading $prog: "    killproc $prog -1    retval=$?    echo    return $retval}force_reload() {    restart}rh_status() {    status $prog}rh_status_q() {    rh_status &>/dev/null}case "$1" in    start)        rh_status_q && exit 0        $1        ;;    stop)        rh_status_q || exit 0        $1        ;;    restart)        $1        ;;    reload)        rh_status_q || exit 7        $1        ;;    force-reload)        force_reload        ;;    status)        rh_status        ;;    condrestart|try-restart)        rh_status_q || exit 0        restart        ;;    *)        echo $"Usage: $0 {start|stop|status|restart|condrestart|try-restart|reload|force-reload}"        exit 2esacexit $?

chmod a+x /etc/init.d/keepalived

cp /usr/local/keepalived/etc/keepalived/keepalived.conf /etc/keepalived/


检查配置文件


vi /etc/keepalived/keepalived.conf

chkconfig --add /etc/init.d/keepalived
chkconfig keepalived on


至此可以使用如下快捷方式操作

service keepalived start
service keepalived restart
service keepalived reload
service keepalived stop