喜歡搞nginx，這兩天研究了一下nginx的負載配置
nginx平台搭建：nginx+mysql+php-fpm搭建高效能nginx平台
單nginx負載均衡：nginx 負載均衡 配置全過程
熟悉上面的配置之後，今天我再來搞nginx + keepalived 的配置，具體拓撲如下：
一、安裝keepalived
ln -s /usr/src/kernels/2.6.18-194.el5-i686/ /usr/src/linux
tar zxvf keepalived-1.1.15.tar.gz
cd keepalived-1.1.15
./configure --prefix=/usr/local/keepalived
make
make install
cp /usr/local/keepalived/etc/rc.d/init.d/keepalived /etc/rc.d/init.d/
cp /usr/local/keepalived/etc/sysconfig/keepalived /etc/sysconfig/
mkdir /etc/keepalived
cp /usr/local/keepalived/etc/keepalived/keepalived.conf /etc/keepalived/ #主配置檔案
cp -v /usr/local/keepalived/sbin/keepalived /usr/sbin/
service keepalived start|stop #啟動、停止服務
二、配置keepalived
/etc/keepalived/keepalived.conf
! configuration file for keepalived
global_defs
notification_email_from
smtp_server 192.168.200.1
smtp_connect_timeout 30
router_id lvs_devel
} vrrp_script chk_nginx
vrrp_instance vi_1
track_script
virtual_ipaddress
} vrrp_instance vi_2
virtual_ipaddress }
global_defs 是全域性配置，定義郵件報警，我無視它了。
vrrp_script 定義乙個監控指令碼，作用：發現nginx掛了，馬上關掉keepalived
vrrp_instance 定義乙個虛擬ip，對外服務的，其中還有個track_script ，這個就是呼叫剛才定義的監控指令碼
另外一台前端nginx的keepalived配置如下：
! configuration file for keepalived
global_defs
notification_email_from [email protected]
smtp_server 192.168.200.1
smtp_connect_timeout 30
router_id lvs_devel
} vrrp_script chk_nginx
vrrp_instance vi_1
virtual_ipaddress
} vrrp_instance vi_2
track_script
virtual_ipaddress }
另外監控指令碼check_http.sh可以自己發揮，原則就是發現nginx掛了就殺掉keepalived就行，寫法多種
pid=`ps -c nginx --no-header | wc -l`
if [ $pid -eq 0 ]
then
/usr/local/nginx/sbin/nginx
sleep 5
newpid=`ps -c nginx --no-header | wc -l`
if [ $newpid -eq 0 ]
then
killall keepalived
fifi
nginx的配置就不多說
啟動服務
/usr/local/nginx/sbin/nginx
service keepalived start
ps -aef | grep keepalived
root 28742 3288 0 03:21 pts/1 00:00:00 grep keepalived
root 31674 1 0 oct31 ? 00:00:00 keepalived -d
root 31676 31674 0 oct31 ? 00:00:00 keepalived -d
root 31677 31674 0 oct31 ? 00:00:02 keepalived -d
三、測試
主nginx
ip add
2: eth0:
mtu 1500 qdisc pfifo_fast qlen 1000
link/ether 00:0c:29:e0:a3:bf brd ff:ff:ff:ff:ff:ff
inet 192.168.93.137/24 brd 192.168.93.255 scope global eth0
inet 192.168.93.144/32 scope global eth0
inet6 fe80::20c:29ff:fee0:a3bf/64 scope link
valid_lft forever preferred_lft forever
備nginx
ip add
2: eth0:
mtu 1500 qdisc pfifo_fast qlen 1000
link/ether 00:0c:29:ee:a6:22 brd ff:ff:ff:ff:ff:ff
inet 192.168.93.138/24 brd 192.168.93.255 scope global eth0
inet 192.168.93.145/32 scope global eth0
inet6 fe80::20c:29ff:feee:a622/64 scope link
valid_lft forever preferred_lft foreve
我把主nginx服務停掉之後：
主nginx
ip add
2: eth0:
mtu 1500 qdisc pfifo_fast qlen 1000
link/ether 00:0c:29:e0:a3:bf brd ff:ff:ff:ff:ff:ff
inet 192.168.93.137/24 brd 192.168.93.255 scope global eth0
inet6 fe80::20c:29ff:fee0:a3bf/64 scope link
valid_lft forever preferred_lft forever
備nginx
ip add
2: eth0:
mtu 1500 qdisc pfifo_fast qlen 1000
link/ether 00:0c:29:ee:a6:22 brd ff:ff:ff:ff:ff:ff
inet 192.168.93.138/24 brd 192.168.93.255 scope global eth0
inet 192.168.93.145/32 scope global eth0
inet 192.168.93.144/32 scope global eth0
inet6 fe80::20c:29ff:feee:a622/64 scope link
valid_lft forever preferred_lft forever
備機已經接管了主的ip，然後再把主機的服務恢復：
主nginx
ip add
2: eth0:
mtu 1500 qdisc pfifo_fast qlen 1000
link/ether 00:0c:29:e0:a3:bf brd ff:ff:ff:ff:ff:ff
inet 192.168.93.137/24 brd 192.168.93.255 scope global eth0
inet 192.168.93.144/32 scope global eth0
inet6 fe80::20c:29ff:fee0:a3bf/64 scope link
valid_lft forever preferred_lft forever
備nginx
ip add
2: eth0:
mtu 1500 qdisc pfifo_fast qlen 1000
link/ether 00:0c:29:ee:a6:22 brd ff:ff:ff:ff:ff:ff
inet 192.168.93.138/24 brd 192.168.93.255 scope global eth0
inet 192.168.93.145/32 scope global eth0
inet6 fe80::20c:29ff:feee:a622/64 scope link
valid_lft forever preferred_lft forever
配置完成！
lihuipeng
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