分享程序员开发的那些事...
更新时间：2022-09-10 19:14:36
#说明
CentOS6.5 64位 keepalived-1.2.13 ipvsadm v1.26 NAT模式
http://zh.linuxvirtualserver.org/
http://www.linuxvirtualserver.org/Documents.html
http://www.austintek.com/LVS/LVS-HOWTO/HOWTO/index.html
lvs服务器2块网卡，real server单网卡，ip如下：
主DR 192.168.22.219
eth0 外网192.168.22.219 192.168.22.249(VIP)
eth1 内网192.168.1.1 192.168.1.5(GateWay)
备DR 192.168.22.203
eth0 外网192.168.22.203 192.168.22.249(VIP)
eth1 内网192.168.1.2 192.168.1.5(GateWay)
realserver1 192.168.1.3 192.168.1.5(GateWay)
realserver2 192.168.1.4 192.168.1.5(GateWay)
#安装lvs和keepalived
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yum install popt popt-devel popt-static libnl libnl-devel
yum install ipvsadm
tar -xzf keepalived-1.2.13.tar.gz
cd keepalived-1.2.13
./configure
makemake install
cp /usr/local/etc/rc.d/init.d/keepalived /etc/rc.d/init.d/
chmod +x /etc/rc.d/init.d/keepalived
cp /usr/local/etc/sysconfig/keepalived /etc/sysconfig/keepalived
cp /usr/local/sbin/keepalived /usr/sbin/keepalived
cp /usr/local/etc/keepalived/keepalived.conf /etc/keepalived/
mv /etc/keepalived/keepalived.conf /etc/keepalived/keepalived.conf.bak
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开启IP转发
net.ipv4.ip_forward=1
#DR主节点和备节点配置
keepalived.conf配置
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# vim /etc/keepalived/keepalived.confglobal_defs { notification_email {
your_email@163.com
}
notification_email_from root@localhost
smtp_server 127.0.0.1
smtp_connect_timeout 30
router_id lvs_dr1
}vrrp_sync_group lvs_1 { group {
VI_1
VI_GATEWAY
}
notify_master "/usr/local/sbin/lvsdr.sh start"
notify_backup "/usr/local/sbin/lvsdr.sh stop"
}vrrp_instance VI_1 { state MASTER #backup为BACKUP
interface eth0
virtual_router_id 51
priority 101 #backup为100
advert_int 1
authentication {
auth_type PASS
auth_pass bbotte
}
virtual_ipaddress {
192.168.22.249 255.255.255.0
}
vrrp_instance VI_GATEWAY { state MASTER #backup为BACKUP
interface eth1
virtual_router_id 52
priority 101 #backup为100
advert_int 1
authentication {
auth_type PASS
auth_pass bbotte
}
virtual_ipaddress {
192.168.1.5
}
}
}virtual_server 192.168.1.5 80{ delay_loop 2
lb_algo rr
lb_kind DR
nat_mask 255.255.255.0
persistence_timeout 60
protocol TCP
real_server 192.168.1.3 80
{
weight 1
TCP_CHECK
{
connect_timeout 5
nb_get_retry 3
delay_before_retry 3
connect_port 80
}
}
real_server 192.168.1.4 80
{
weight 1
TCP_CHECK
{
connect_timeout 5
nb_get_retry 3
delay_before_retry 3
connect_port 80
}
}
} |
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vim /usr/local/sbin/lvsdr.sh
#!/bin/bash## LVS script for VS/DR. /etc/rc.d/init.d/functions
#VIP=192.168.22.249RIP1=192.168.1.3RIP2=192.168.1.4#case "$1" in
start) /sbin/ifconfig eth0:1 $VIP netmask 255.255.255.0 up
# Since this is the Director we must be able to forward packets echo 1 > /proc/sys/net/ipv4/ip_forward
# Clear all iptables rules. /sbin/iptables -F
# Reset iptables counters. /sbin/iptables -Z
# Clear all ipvsadm rules/services. /sbin/ipvsadm -C
# Add an IP virtual service for VIP 192.168.0.200 port 80# In this recipe, we will use the round-robin scheduling method.# In production, however, you should use a weighted, dynamic scheduling method. /sbin/ipvsadm -A -t $VIP:80 -s rr
# Now direct packets for this VIP to# the real server IP (RIP) inside the cluster /sbin/ipvsadm -a -t $VIP:80 -r $RIP1 -m
/sbin/ipvsadm -a -t $VIP:80 -r $RIP2 -m
/bin/touch /var/lock/subsys/ipvsadm.lock
;;stop)# Stop forwarding packets echo 0 > /proc/sys/net/ipv4/ip_forward
# Reset ipvsadm /sbin/ipvsadm -C
# Bring down the VIP interface ifconfig eth0:1 down
rm -rf /var/lock/subsys/ipvsadm.lock
;;status) [ -e /var/lock/subsys/ipvsadm.lock ] && echo "ipvs is running..." || echo "ipvsadm is stopped..."
;;*) echo "Usage: $0 {start|stop}"
;;esac |
#Real Server配置
下面配置2台real server
两台机均为centos 6.5 yum安装httpd服务并启动，iptables对80端口开放
Real Server 1:
cat /var/www/html/index.html
web 1111111111111
Real Server 2:
cat /var/www/html/index.html
test 22222222222
开启IP转发
net.ipv4.ip_forward=1
配置网关
＃vim /etc/sysconfig/network-scripts/ifcfg-eth0添加
GATEWAY="192.168.1.5"
realserver.sh相同，并启动此脚本
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vim realserver.sh#!/bin/bash## Script to start LVS DR real server.# description: LVS DR real server#. /etc/rc.d/init.d/functions
VIP=192.168.22.249host=`/bin/hostname`
case "$1" in
start) # Start LVS-DR real server on this machine.
/sbin/ifconfig lo down
/sbin/ifconfig lo up
echo 1 > /proc/sys/net/ipv4/conf/lo/arp_ignore
echo 2 > /proc/sys/net/ipv4/conf/lo/arp_announce
echo 1 > /proc/sys/net/ipv4/conf/all/arp_ignore
echo 2 > /proc/sys/net/ipv4/conf/all/arp_announce
/sbin/ifconfig lo:0 $VIP broadcast $VIP netmask 255.255.255.255 up
/sbin/route add -host $VIP dev lo:0
;;stop) # Stop LVS-DR real server loopback device(s).
/sbin/ifconfig lo:0 down
echo 0 > /proc/sys/net/ipv4/conf/lo/arp_ignore
echo 0 > /proc/sys/net/ipv4/conf/lo/arp_announce
echo 0 > /proc/sys/net/ipv4/conf/all/arp_ignore
echo 0 > /proc/sys/net/ipv4/conf/all/arp_announce
;;status) # Status of LVS-DR real server.
islothere=`/sbin/ifconfig lo:0 | grep $VIP`
isrothere=`netstat -rn | grep "lo:0" | grep $VIP`
if [ ! "$islothere" -o ! "isrothere" ];then
# Either the route or the lo:0 device
# not found.
echo "LVS-DR real server Stopped."
else
echo "LVS-DR real server Running."
fi
;;*) # Invalid entry.
echo "$0: Usage: $0 {start|status|stop}"
exit 1
;;esac |
查看信息
DR MASTER：
DR BACKUP：
ip没有变动，为自己原有的ip
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[root@localhost ~]# ipvsadm -Ln
IP Virtual Server version 1.2.1 (size=4096)Prot LocalAddress:Port Scheduler Flags -> RemoteAddress:Port
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Real Server1：
测试
1，测试Real Server挂掉一个是否影响
把Real Server1的httpd服务关闭，打开VIP页面，一直刷新
2，测试keepalived的MASTER挂掉后，BACKUP能否正常接替主继续工作
把MASTER重启，在重启的期间，一直打开VIP首页查看，MASTER重启后，keepalived开机启动，继续由MASTER提供服务
