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用lvs+keepalive构建高可用的后端nginx+tomcat
nginx和tomcat实现动静分离，加快访问网站的速度。
工作流程就是
lvs---->keepalive---->nginx负载均衡---->tomcat
准备四台服务器：
1. web1 :192.168.4.10
2. web2 :192.168.4.11
3. keep_master :192.168.4.20
4. kepp_slave :192.168.4.21
web1和web2上： (web2一样)
nginx安装过程省略...
1. 配置ngnix
[root@web1 opt]# vim /usr/local/nginx/conf/nginx.conf
user nginx nginx;
worker_processes 1;
error_log logs/error.log info;
pid logs/nginx.pid;
worker_rlimit_nofile 65535;
events {
worker_connections 1024;
use epoll;
}
http {
include mime.types;
default_type application/octet-stream;
log_format main ‘$remote_addr - $remote_user [$time_local] "$request" ‘
‘$status $body_bytes_sent "$http_referer" ‘
‘"$http_user_agent" "$http_x_forwarded_for"‘;
access_log logs/access.log main;
#tcp_nopush on;
server_names_hash_bucket_size 128;
client_header_buffer_size 32k;
large_client_header_buffers 4 32k;
client_max_body_size 300m;
sendfile on;
tcp_nopush on;
keepalive_timeout 65;
tcp_nodelay on;
server_tokens off;
client_body_buffer_size 512k;
proxy_connect_timeout 5;
proxy_send_timeout 60;
proxy_read_timeout 5;
proxy_buffer_size 16k;
proxy_buffers 4 64k;
proxy_busy_buffers_size 128k;
proxy_temp_file_write_size 128k;
#keepalive_timeout 0;
gzip on;
gzip_min_length 1k;
gzip_buffers 4 16k;
gzip_http_version 1.1;
gzip_comp_level 2;
gzip_types text/plain application/x -javascript text/css application/xml;
gzip_vary on;
server {
listen 80;
server_name www.test123.com;
index index.html index.htm index.jsp index.do;
root /var/www/html;
error_page 404 /404.html;
error_page 500 502 503 504 /50x.html;
location = /50x.html {
root html;
}
location ~ \.(jsp|jspx|do)?$ {
proxy_set_header Host $host;
proxy_set_header X-Real-IP $remote_addr;
proxy_pass http://127.0.0.1:8080;
}
location ~ .*\.(htm|html|gif|jpg|jpeg|png|bmp|swf|zip|rar|doc|mp3|pdf)
{ expires 30d;
}
location ~ .*\.(js|css)?$
{ expires 1h;
}
}
开启nginx
[root@web1 opt]# /usr/local/nginx/sbin/nginx
[root@web2 opt]# /usr/local/nginx/sbin/nginx
[root@web1 opt]#echo "192.168.4.10" >/var/www/html/index.html
[root@web2 opt]#echo "192.168.4.12" >/var/www/html/index.htm
安装tomcat
安装过程省略...
2 . 配置tomcat（web2一样）
[root@web1 opt]# vim /usr/local/tomcat/conf/server.xml
<Host name="www.test123.com" appBase="a"
unpackWARs="true" autoDeploy="true">
3 .创建jsp文件，测试
[root@web1 opt]#vim /var/www/html/111.jsp
Now time is: <%=new>
[root@web2 opt]#vim /var/www/html/111.jsp
Now time is: <%=new>
4.[root@web1 opt]#/usr/local/tomcat/bin/startup.sh
[root@web2 opt]#/usr/local/tomcat/bin/startup.sh
5.编写realserver.sh脚本，在lo网卡上绑定VIP，设定ARP抵制功能
[root@web1 opt]# cat realserver.sh
#!/bin/bash
snf_vip=192.168.4.100
case $1 in
start)
ifconfig lo:0 $snf_vip netmask 255.255.255.255 broadcast $snf_vip
/sbin/route add -host $snf_vip dev lo:0
echo "1" >/proc/sys/net/ipv4/conf/lo/arp_ignore
echo "1" >/proc/sys/net/ipv4/conf/all/arp_ignore
echo "2" >/proc/sys/net/ipv4/conf/lo/arp_announce
echo "2" >/proc/sys/net/ipv4/conf/all/arp_announce
sysctl -p &>/dev/null
echo -e "\033[32m start OK\033[0m"
;;
stop)
ifconfig lo:0 down
/sbin/route del $snf_vip &>/dev/null
echo "0" >/proc/sys/net/ipv4/conf/lo/arp_ignore
echo "0" >/proc/sys/net/ipv4/conf/all/arp_ignore
echo "0" >/proc/sys/net/ipv4/conf/lo/arp_announce
echo "0" >/proc/sys/net/ipv4/conf/all/arp_announce
sysctl -p &>/dev/null
echo -e "\033[32m stopd OK\033[0m"
;;
*)
echo "Usage: $0 {start|stop}"
exit 1
;;
esac
exit 0
6 . 运行脚本。
[root@web1 opt]#./realserver.sh start
[root@web2 opt]#./realserver.sh start
7 . keep_master和keep_slave上安装ipvsadm和keepalive(keep_slave一样)
[root@ keep_master LoadBalancer]# rpm -ivh ipvsadm-1.26-4.el6.x86_64.rpm
[root@lkeep_master ~]# yum install -y gcc kernel-devel openssl-devel popt-devel
[root@lkeep_master ~]# tar -xzf keepalived-1.2.7.tar.gz
[root@lkeep_master ~]# cd keepalived-1.2.7
[root@lkeep_master keepalived-1.2.7]# ./configure --sysconf=/etc
[root@lkeep_master keepalived-1.2.7]# make && make install
[root@lkeep_master keepalived-1.2.7]# ln -s /usr/local/sbin/keepalived /sbin/
[root@lkeep_master keepalived-1.2.7]# chkconfig keepalived on
[root@keep_master opt]# cat keepalived.conf
! Configuration File for keepalived
global_defs {
notification_email {
zte_lwz1@126.com
}
notification_email_from keep_lvs@mail.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
priority 100
advert_int 1
authentication {
auth_type PASS
auth_pass 1111
}
virtual_ipaddress {
192.168.4.100
}
}
virtual_server 192.168.4.100 80 {
delay_loop 6
lb_algo wrr
lb_kind DR
persistence_timeout 60
protocol TCP
real_server 192.168.4.10 80 {
weight 1
TCP_CHECK {
connect_timeout 10
nb_get_retry 3
delay_before_retry 3
connect_port 80
}
}
real_server 192.168.4.11 80 {
weight 1
TCP_CHECK {
connect_timeout 10
nb_get_retry 3
delay_before_retry 3
connect_port 80
}
}
}
在keep_slave上只需修改
state MASTER ------>state SLAVE
router_id lvs1 ------> router_id lvs2
priority 100 ------> priority 80
8. [root@web1 opt]# vim /etc/rc.local (web2一样）
ulimit -SHn 65535 65535
/usr/local/nginx/sbin/nginx
/usr/local/tomcat/bin/startup.sh
/usr/local/bin/realserver.sh start
9.
[root@keep_master opt]#/etc/init.d/keepalived start
[root@keep_slave opt]#/etc/init.d/keepalived start
10. 测试,在客户端测试
[root@localhost ~]#vim /etc/hosts
192.168.4.100 www.test123.com
[root@localhost ~]# curl www.test123.com
192.168.4.10
关闭[root@web1 opt]# /usr/local/nginx/sbin/nginx -s stop
[root@localhost ~]# curl www.test123.com
192.168.4.11
11.访问jsp
[root@localhost ~]# curl www.test123.com/111.jsp
......
12.keepalive的主备测试就不测试了。
13. [root@keep_master opt]#ipvsadm -Ln本文出自 “蚂蚱小子” 博客，请务必保留此出处http://zxlwz.blog.51cto.com/6952946/1852422
用lvs+keepalive构建高可用的后端nginx+tomcat
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