LVS+Keepalived安装过程

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为了方便测试,禁掉防火墙和Selinux

(1) 禁掉防火墙

chkconfig iptables off

(2) 禁掉Selinux

vi /etc/selinux/config

SELINUX=disabled

(3) 必须重新启动系统

shutdown -r now

一.检查lvs模块是否已经安装

1)modprobe -l | grep ipvs

2)cd /boot

cat config-2.6.32-358.el6.x86_64 | grep -i ipvs

二.yum安装ipvsadm

yum -y install ipvsadm

三.安装keepalived

1.先安装所需的环境

1)gcc

yum install gcc gcc-c++

2)openssl-devel, openssl

yum install openssl-devel openssl

3)源码内核

yum install kernel-devel kernel

建立软连接

ln -s /usr/src/kernels/内核名称/ /usr/src/linux

4)popt-devel , libnl-devel

yum install popt-devel libnl-devel

5）libnfnetlink-devel

yum install -y libnfnetlink-devel

2.源码安装keepalived

1)cd /usr/local/src 下载keepalived

wget http://www.keepalived.org/software/keepalived-版本号.tar.gz

http://www.keepalived.org/software/keepalived-1.2.20.tar.gz

2)解压缩

tar -zxvf keepalived-版本号.tar.gz

cd keepalived-版本号

3)配置安装,依次执行

./configure

确保以下3个信息都为YES

Use IPVS Framework YES

IPVS sync daemon support YES

Use VRRP Framework YES

make

make install

4)创建软连接

ln -s /usr/local/sbin/keepalived /sbin/

5)检查是否安装成功

keepalived --help

6）启动设置

cp /usr/local/etc/rc.d/init.d/keepalived /etc/rc.d/init.d

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

mkdir /etc/keepalilved

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

cp /usr/local/sbin/keepalived /usr/sbin/

7) 配置keepalived.conf

vi /etc/keepalived/keepalived.conf

8) 启动keepalived服务并查看进程

service keepalived start (或者/etc/init.d/keepalived start)

ps -ef | grep keepalived

ipvsadm -L -n

重启 service keepalived restart

9) 设置开机自启动

chkconfig keepalived on

======================keepalived.conf配置文件=========================

! Configuration File for keepalived
global_defs {
notification_email {
acassen@firewall.loc #设置报警邮件地址,可以设置多个,每行1个，
failover@firewall.loc #需开启邮件报警及本机的Sendmail服务。
sysadmin@firewall.loc
}
notification_email_from Alexandre.Cassen@firewall.loc
smtp_server 192.168.200.1 #设置SMTP Server地址；
smtp_connect_timeout 30
router_id LVS_DEVEL
}
########VRRP Instance########
vrrp_instance VI_1 {
state MASTER #指定Keepalived的角色，MASTER为主机服务器，BACKUP为备用服务器
interface eth0 #BACKUP为备用服务器
virtual_router_id 51
priority 100 #定义优先级，数字越大，优先级越高，主DR必须大于备用DR。
advert_int 1
authentication {
auth_type PASS #设置验证类型，主要有PASS和AH两种
auth_pass 1111 #设置验证密码
}
virtual_ipaddress {
192.168.1.200 #设置主DR的虚拟IP地址(virtual IP),可多设，但必须每行1个
}
}
########Virtual Server########
virtual_server 192.168.1.200 80 { #注意IP地址与端口号之间用空格隔开
delay_loop 6 #设置健康检查时间，单位是秒
lb_algo rr #设置负载调度算法，默认为rr,即轮询算法,最优秀是wlc算法
lb_kind DR #设置LVS实现LB机制，有NAT、TUNN和DR三个模式可选
nat_mask 255.255.255.0
persistence_timeout 50 #会话保持时间，单位为秒
protocol TCP #指定转发协议类型，有TCP和UDP两种
real_server 192.168.1.132 80 {
weight 1 #配置节点权值，数字越大权值越高
TCP_CHECK {
connect_timeout 3 #表示3秒无响应，则超时
nb_get_retry 3 #表示重试次数
delay_before_retry 3 #表示重试间隔
}
}
real_server 192.168.1.133 80 { #配置服务器节点，即Real Server2的public IP
weight 3 #配置节点权值，数字越大权值越高
TCP_CHECK {
connect_timeout 3 #表示3秒无响应，则超时
nb_get_retry 3 #表示重试次数
delay_before_retry 3 #表示重试间隔
}
}
}
====================keepalived.conf配置完成======================
对于slave的keepalived.conf中与上相同，更改
1. state 改为 BACKUP //标明为备用服务器
2. priority 90 //设置优先级低于主服务器
========================================================

状态监控

1.测试lvs能否进行负载均衡转发，利用ipvsadm命令查看

2. 如果想只当当前的请求转发到哪个服务器去了，可以用ipvsadm加选项来查看，其完整形式为：ipvsadm –lcn | grep 192.168.1.115

3. 查看详细日志 tail -f /var/log/messages

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