Nginx+keepalived双机高可用性
一：主-备 模式1.安装keepalived
# wget http://www.keepalived.org/software/keepalived-1.2.7.tar.gz
# tar zxvf keepalived-1.2.7
# ./configure --prefix=/opt/keepalived/
# make && make install
2.设置启动模式
# cp /opt/keepalived/sbin/keepalived /usr/sbin/
# cp /opt/keepalived/etc/sysconfig/keepalived /etc/sysconfig/
# cp /opt/keepalived/etc/rc.d/init.d/keepalived /etc/init.d/
# chkconfig --add keepalived
# service keepalived start
启动 keepalived： [确定]
3.配置主机和备机上的keepalived配置文件
主机上：
mkdir /etc/keepalived
vim /etc/keepalived/keepalived.conf
! Configuration File for keepalived
global_defs {
notification_email {
zhujiangtao@iwgame.com
}
notification_email_fromadmin@yahunet.com
smtp_server 127.0.0.1
smtp_connect_timeout 30
router_id LVS_DEVEL
}
vrrp_instance VI_1 {
state BACKUP
interface eth0
virtual_router_id 51
mcast_src_ip 192.168.70.133 #此处是主nginx的ip地址
priority 100
advert_int 1
authentication {
auth_type PASS
auth_pass chtopnet
}
virtual_ipaddress {
192.168.70.7
}
}
备机上的配置文件
! Configuration File for keepalived
global_defs {
notification_email {
zhujiangtao@iwgame.com
}
notification_email_from keepalived@domain.com
smtp_server 127.0.0.1
smtp_connect_timeout 30
router_id LVS_DEVEL
}
vrrp_instance VI_1 {
state MASTER
interface eth0
virtual_router_id 51
mcast_src_ip 192.168.70.135 #此处是备机的ip地址
priority 99
advert_int 1
authentication {
auth_type PASS
auth_pass chtopnet
}
virtual_ipaddress {
192.168.70.7
}
}
4.启动并查看ip
# service keepalived start
# ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 16436 qdisc noqueue
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
inet6 ::1/128 scope host
valid_lft forever preferred_lft forever
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast qlen 1000
link/ether 00:0c:29:d3:3b:5e brd ff:ff:ff:ff:ff:ff
inet 192.168.70.133/24 brd 192.168.70.255 scope global eth0
inet 192.168.70.7/32 scope global eth0
inet6 fe80::20c:29ff:fed3:3b5e/64 scope link
valid_lft forever preferred_lft forever
3: sit0: <NOARP> mtu 1480 qdisc noop
link/sit 0.0.0.0 brd 0.0.0.0
可以看到此时vip 192.168.70.7 已绑定在eth0网卡上
# service keepalived start
# ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 16436 qdisc noqueue
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
inet6 ::1/128 scope host
valid_lft forever preferred_lft forever
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast qlen 1000
link/ether 00:0c:29:ba:9d:f1 brd ff:ff:ff:ff:ff:ff
inet 192.168.70.135/24 brd 192.168.70.255 scope global eth0
inet6 fe80::20c:29ff:feba:9df1/64 scope link
valid_lft forever preferred_lft forever
3: sit0: <NOARP> mtu 1480 qdisc noop
link/sit 0.0.0.0 brd 0.0.0.0
此时备机上没有虚拟ip。
把主机上的keepalived进程停掉观察
# service keepalived stop
停止 keepalived： [确定]
# ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 16436 qdisc noqueue
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
inet6 ::1/128 scope host
valid_lft forever preferred_lft forever
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast qlen 1000
link/ether 00:0c:29:d3:3b:5e brd ff:ff:ff:ff:ff:ff
inet 192.168.70.133/24 brd 192.168.70.255 scope global eth0
inet6 fe80::20c:29ff:fed3:3b5e/64 scope link
valid_lft forever preferred_lft forever
3: sit0: <NOARP> mtu 1480 qdisc noop
link/sit 0.0.0.0 brd 0.0.0.0
# ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 16436 qdisc noqueue
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
inet6 ::1/128 scope host
valid_lft forever preferred_lft forever
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast qlen 1000
link/ether 00:0c:29:ba:9d:f1 brd ff:ff:ff:ff:ff:ff
inet 192.168.70.135/24 brd 192.168.70.255 scope global eth0
inet 192.168.70.7/32 scope global eth0
inet6 fe80::20c:29ff:feba:9df1/64 scope link
valid_lft forever preferred_lft forever
3: sit0: <NOARP> mtu 1480 qdisc noop
link/sit 0.0.0.0 brd 0.0.0.0
此时虚拟ip已自动跳到备机上。
当主 机上keepalived恢复正常后，vip又会自动回来
# service keepalived start
# ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 16436 qdisc noqueue
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
inet6 ::1/128 scope host
valid_lft forever preferred_lft forever
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast qlen 1000
link/ether 00:0c:29:d3:3b:5e brd ff:ff:ff:ff:ff:ff
inet 192.168.70.133/24 brd 192.168.70.255 scope global eth0
inet 192.168.70.7/32 scope global eth0
inet6 fe80::20c:29ff:fed3:3b5e/64 scope link
valid_lft forever preferred_lft forever
3: sit0: <NOARP> mtu 1480 qdisc noop
link/sit 0.0.0.0 brd 0.0.0.0
为了保证nginx服务的高可用性，用脚本监控。
#!/bin/bash
while :
do
nginxpid=`ps -C nginx --no-header | wc -l`
if [ $nginxpid -eq 0 ];then
/opt/nginx/sbin/nginx
sleep 5
nginxpid=`ps -C nginx --no-header | wc -l`
echo $nginxpid
if [ $nginxpid -eq 0 ];then
/etc/init.d/keepalived stop
fi
fi
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