nginx配合keepalive的方案（双主）
blog.etiantian.org 10.0.0.17lb01 主 10.0.0.5
bbs.etiantian.org 10.0.0.18 lb02主 10.0.0.6
说明：后端的web服务器一个是apacheweb服务，一个nginx服务
测试，，选用静态的html，不涉及nfs以及mysql
1.A1-nginx 负载服务器 01-10.0.0.5-lb01
①查看keepalive的配置文件
# cat /etc/keepalived/keepalived.conf
global_defs {
notification_email {
31333741@qq.com
}
notification_email_from31333741@qq.com
smtp_server 192.168.200.1
smtp_connect_timeout 30
router_id LVS_DEVEL
}
vrrp_instance VI_17 {
state MASTER
interface eth0
virtual_router_id 51
priority 150
advert_int 1
authentication {
auth_type PASS
auth_pass 1111
}
virtual_ipaddress {
10.0.0.17/24 dev eth0 label eth0:1
}
}
vrrp_instance VI_18 {
state BACKUP
interface eth0
virtual_router_id 52
priority 100
advert_int 1
authentication {
auth_type PASS
auth_pass 1111
}
virtual_ipaddress {
10.0.0.18/24 dev eth0 label eth0:2
}
}
#
②查看nginx的配置文件
# cat /application/nginx/conf/nginx.conf
worker_processes1;
events {
worker_connections1024;
}
http {
include mime.types;
default_typeapplication/octet-stream;
sendfile on;
keepalive_timeout65;
upstream server_pools {
server 172.16.1.7:80weight=1;
server 172.16.1.8:80weight=1;
}
server {
listen 10.0.0.17:80;
server_nameblog.etiantian.org;
location / {
proxy_pass http://server_pools;
proxy_set_header Host$host;
proxy_set_header X-Forwarded-For $remote_addr;
}
}
server {
listen 10.0.0.18:80;
server_namebbs.etiantian.org;
location / {
proxy_pass http://server_pools;
proxy_set_header Host$host;
proxy_set_header X-Forwarded-For $remote_addr;
}
}
}
#
A2-nginx 负载服务器 02 -10.0.0.6-lb02
①查看keepalive的配置文件
# cat /etc/keepalived/keepalived.conf
global_defs {
notification_email {
31333741@qq.com
}
notification_email_from31333741@qq.com
smtp_server 192.168.200.1
smtp_connect_timeout 30
router_id LVS_DEVEL1
}
vrrp_instance VI_1 {
state BACKUP
interface eth0
virtual_router_id 51
priority 100
advert_int 1
authentication {
auth_type PASS
auth_pass 1111
}
virtual_ipaddress {
10.0.0.17/24 dev eth0 label eth0:1
}
}
vrrp_instance VI_18 {
state MASTER
interface eth0
virtual_router_id 52
priority 150
advert_int 1
authentication {
auth_type PASS
auth_pass 1111
}
virtual_ipaddress {
10.0.0.18/24 dev eth0 label eth0:2
}
}
#
②查看nginx的配置文件
# cat/application/nginx/conf/nginx.conf
worker_processes1;
events {
worker_connections1024;
}
http {
include mime.types;
default_typeapplication/octet-stream;
sendfile on;
keepalive_timeout65;
upstream server_pools {
server 172.16.1.7:80weight=1;
server 172.16.1.8:80weight=1;
}
server {
listen 80;
server_nameblog.etiantian.org;
location / {
proxy_pass http://server_pools;
proxy_set_header Host$host;
proxy_set_header X-Forwarded-For $remote_addr;
}
}
server {
listen 10.0.0.18:80;
server_namebbs.etiantian.org;
location / {
proxy_pass http://server_pools;
proxy_set_header Host$host;
proxy_set_header X-Forwarded-For $remote_addr;
}
}
}
#
测试blog和bbs的站点：
宕掉一台负载均衡器再接着测试
宕机以后查看IP：可以看出IP全部飘过来了
# ifconfig
eth0 Link encap:EthernetHWaddr 00:0C:29:90:A5:31
inet addr:10.0.0.5Bcast:10.0.0.255Mask:255.255.255.0
inet6 addr: fe80::20c:29ff:fe90:a531/64 Scope:Link
UP BROADCAST RUNNING MULTICASTMTU:1500Metric:1
RX packets:299420 errors:0 dropped:0 overruns:0 frame:0
TX packets:319616 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:26869861 (25.6 MiB)TX bytes:58054361 (55.3 MiB)
eth0:1 Link encap:EthernetHWaddr 00:0C:29:90:A5:31
inet addr:10.0.0.17Bcast:0.0.0.0Mask:255.255.255.0
UP BROADCAST RUNNING MULTICASTMTU:1500Metric:1
eth0:2 Link encap:EthernetHWaddr 00:0C:29:90:A5:31
inet addr:10.0.0.18Bcast:0.0.0.0Mask:255.255.255.0
UP BROADCAST RUNNING MULTICASTMTU:1500Metric:1
eth1 Link encap:EthernetHWaddr 00:0C:29:90:A5:3B
inet addr:172.16.1.5Bcast:172.16.1.255Mask:255.255.255.0
inet6 addr: fe80::20c:29ff:fe90:a53b/64 Scope:Link
UP BROADCAST RUNNING MULTICASTMTU:1500Metric:1
RX packets:1971 errors:0 dropped:0 overruns:0 frame:0
TX packets:356 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:334109 (326.2 KiB)TX bytes:47217 (46.1 KiB)
lo Link encap:Local Loopback
inet addr:127.0.0.1Mask:255.0.0.0
inet6 addr: ::1/128 Scope:Host
UP LOOPBACK RUNNINGMTU:65536Metric:1
RX packets:293602 errors:0 dropped:0 overruns:0 frame:0
TX packets:293602 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:17072153 (16.2 MiB)TX bytes:17072153 (16.2 MiB)
#
web测试（依然OK）：
keepalive和 drbd 都是基于硬件方面的切换
例如：服务器宕机或者keepalive服务停掉，ip就会自动切换
但是有一个问题就是nginx服务没有正常开启或者宕掉。但是这个时候
keepalive的虚拟IP不会自动漂移，以下是解决方案。
思路：监控nginx服务，如果不正常，就停掉keepalived或者关机
方法1.守护进程的方式
说明：可以在每个负载均衡器上让这个脚本在后台执行
# catcheck_w_proxy.sh
#!/bin/bash
while true
do
nginxpid=`ps-Cnginx--no-header|wc -l`
if [ $nginxpid -eq 0 ];then
/application/nginx/sbin/nginx
sleep 5
nginxpid=`ps-Cnginx--no-header|wc -l`
if [ $nginxpid-eq 0 ];then
/etc/init.d/keepalived stop
exit 1
fi
fi
sleep5
done
#
# shcheck_w_proxy.sh&
3046
方法2.keepalive内置触发配置
在每个负载均衡器的虚拟Ip为master内配置，然后调用，
主节点挂了，备节点来接管
# cat/etc/keepalived/keepalived.conf
global_defs {
notification_email {
31333741@qq.com
}
notification_email_from31333741@qq.com
smtp_server 192.168.200.1
smtp_connect_timeout 30
router_id LVS_DEVEL1
}
vrrp_scriptcheck_nginx_proxy {
script"/server/scripts/check_w_proxy.sh"
interval 2
weight 2
}
vrrp_instance VI_1 {
state BACKUP
interface eth0
virtual_router_id 51
priority 100
advert_int 1
authentication {
auth_type PASS
auth_pass 1111
}
virtual_ipaddress {
10.0.0.17/24 dev eth0 label eth0:1
}
}
vrrp_instance VI_18 {
state MASTER
interface eth0
virtual_router_id 52
priority 150
advert_int 1
authentication {
auth_type PASS
auth_pass 1111
}
virtual_ipaddress {
10.0.0.18/24 dev eth0 label eth0:2
}
track_script {
check_nginx_proxy
}
}
#
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