Keepalived实现Nginx与LVS高可用
http://s3.运维网.com/wyfs02/M01/82/BA/wKiom1dfh6PyfaDgAALmp-7TI0Q305.png在192.168.1.10和192.168.1.20分别安装：
#yum –y install keepalived
192.168.1.10的配置文件内容：
#vim keepalived.conf
! Configuration File for keepalived
global_defs {
notification_email {
root@localhost
}
notification_email_from keepalived@localhost
smtp_server 127.0.0.1
smtp_connect_timeout 30
router_id LVS_DEVEL
}
vrrp_script chk_nginx {
script "pidof nginx "
interval 1
weight -3
fall 2
rise 1
}
vrrp_instance VI_1 {
state MASTER
interface eth0
virtual_router_id 51
priority 100
advert_int 1
authentication {
auth_type PASS
auth_pass 1111
}
virtual_ipaddress {
192.168.1.100
}
track_script {
chk_nginx
}
notify_master "/etc/keepalived/notify.sh master "
notify_backup "/etc/keepalived/notify.sh backup "
notify_fault "/etc/keepalived/notify.sh fault "
}
192.168.1.20的配置文件内容：
#vim keepalived.conf
! Configuration File for keepalived
global_defs {
notification_email {
root@localhost
}
notification_email_from keepalived@localhost
smtp_server 127.0.0.1
smtp_connect_timeout 30
router_id LVS_DEVEL
}
vrrp_script chk_nginx {
script "pidof nginx "
interval 1
weight -1
fall 2
rise 1
}
vrrp_instance VI_1 {
state BACKUP
interface eth0
virtual_router_id 51
priority 99
advert_int 1
authentication {
auth_type PASS
auth_pass 1111
}
virtual_ipaddress {
192.168.1.100
}
track_script {
chk_nginx
}
notify_master "/etc/keepalived/notify.sh master "
notify_backup "/etc/keepalived/notify.sh backup "
notify_fault "/etc/keepalived/notify.sh fault "
}
主备服务器上的脚本内容：
#vim /etc/keepalived/notify.sh notify.sh
#!/bin/bash
case "$1" in
master)
/etc/init.d/nginx start
exit 0
;;
backup)
/etc/init.d/nginx stop
exit 0
;;
fault)
/etc/init.d/nginx stop
exit 0
;;
*)
echo 'Usage: `basename $0` {master|backup|fault}'
exit 1
;;
esac
主备服务器上LVS配置内容：
virtual_server 192.168.1.100 80 {
delay_loop 6
lb_algo rr
lb_kind DR
nat_mask 255.255.255.0
persistence_timeout 0
protocol TCP
real_server 192.168.1.30 80 {
weight 1
HTTP_GET {
url {
path /demo.php
status_code 200
}
connect_timeout 3
nb_get_retry 3
delay_before_retry 3
}
}
real_server 192.168.1.40 80 {
weight 1
HTTP_GET {
url {
path /demo.php
status_code 200
}
connect_timeout 3
nb_get_retry 3
delay_before_retry 3
}
}
}
在nginx1和nginx2上分别运行一下命令：
ip addr add 192.168.1.100/32 label lo:0 brd 192.168.1.100 dev lo
echo 1 > /proc/sys/net/ipv4/conf/eth0/arp_ignore
echo 2 > /proc/sys/net/ipv4/conf/eth0/arp_announce
echo 1 > /proc/sys/net/ipv4/conf/all/arp_ignore
echo 2 > /proc/sys/net/ipv4/conf/all/arp_announce
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