Nginx負載均衡器的優點許多,簡單概括爲:
①實現了可彈性化的架構,在壓力增大的時候可以臨時添加tomcat服務器添加到這個架構裏面去;
②upstream具有負載均衡能力,可以自動判斷下面的機器,並且自動踢出不能正常提供服務的機器;而Keepalvied可保證單個nginx負載均衡器的有效性,避免單點故障.
IP地址
nginx(主負載均衡器):192.168.18.118
nginx(從負載均衡器):192.168.1.120
VIP地址:192.168.1.108
web1的IP:192.168.18.105
web2的IP:192.168.18.117
web3的IP:192.168.1.121
佈置整個環境用到的軟件爲:
1. nginx-0.7.17.tar.gz
2. prce-7.7.tar.gz
3. mysql
4. php
①首先分別在3臺tomcat主機上佈置環境,安裝nginx+php+mysql,具體步驟爲:
略
②分別在二臺nginx負載均衡器上安裝nginx及配置
下載及安裝nginx:
1. wget ftp://ftp.csx.cam.ac.uk/pub/software/programming/pcre/pcre-7.7.tar.gz
2. tar zxvf pcre-7.7.tar.gz
3. cd pcre-7.7/
4. ./configure
5. make && make install
6. wget http://sysoev.ru/nginx/nginx-0.7.17.tar.gz
7. tar zxvf nginx-0.7.17.tar.gz
8. cd nginx-0.7.17/
9. ./configure --prefix=/usr/local/nginx --with-http_stub_status_module
10. make && make install
這裏貼上nginx.conf配置文件,不加任何說明,方便用X-shell直接粘貼,很人性化的噢:)二個nginx負載均衡器的文件一樣,配置完成後分別用/usr/local/nginx/sbin/nginx啓動｡
user www www;
worker_processes 1;
pid /usr/local/nginx/logs/nginx.pid;
worker_rlimit_nofile 51200;
events
{
use epoll;
worker_connections 51200;
}
http{
include mime.types;
default_type application/octet-stream;
server_names_hash_bucket_size 128;
client_header_buffer_size 32k;
large_client_header_buffers 4 32k;
client_max_body_size 8m;
sendfile on;
tcp_nopush on;
keepalive_timeout 60;
tcp_nodelay on;
fastcgi_connect_timeout 300;
fastcgi_send_timeout 300;
fastcgi_read_timeout 300;
fastcgi_buffer_size 64k;
fastcgi_buffers 4 64k;
fastcgi_busy_buffers_size 128k;
fastcgi_temp_file_write_size 128k;
gzip on;
gzip_min_length 1k;
gzip_buffers 4 16k;
gzip_http_version 1.0;
gzip_comp_level 2;
gzip_types text/plain application/x-javascript text/css application/xml;
gzip_vary on;
upstream backend
{
server 192.168.18.117;
server 192.168.18.105;
server 192.168.1.121;
}
server {
listen 80;
server_name test.com www.test.com;
location / {
root /usr/local/nginx/www ;
index index.jsp index.htm index.html;
proxy_redirect off;
proxy_set_header Host $host;
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_pass http://backend;
}
#location /nginx {
#access_log on;
#auth_basic "NginxStatus";
#auth_basic_user_file /usr/local/nginx/htpasswd;
#}
log_format access '$remote_addr - $remote_user [$time_local] "$request" '
'$status $body_bytes_sent "$http_referer" '
'"$http_user_agent" $http_x_forwarded_for';
access_log /usr/local/nginx/logs/access.log access;
}
}
③在二臺Nginx機上安裝及配置keepalived,做雙機互備｡
1. #wget http://www.keepalived.org/software/keepalived-1.1.15.tar.gz
2. #tar zxvf keepalived-1.1.15.tar.gz
3. #cd keepalived-1.1.15
4. #./configure
5. #make
6. #make install
7. 將keepalived做成啓動腳務,方便管理:
8. #cp /usr/local/etc/rc.d/init.d/keepalived /etc/rc.d/init.d/
9. #cp /usr/local/etc/sysconfig/keepalived /etc/sysconfig/
10. #mkdir /etc/keepalived
11. #cp /usr/local/etc/keepalived/keepalived.conf /etc/keepalived/
12. #cp /usr/local/sbin/keepalived /usr/sbin/
13. #service keepalived start|stop
在二臺Nginx上,我分別貼出keepalived.conf配置文件,配置完成後分別用service keepalived start啓動｡檢驗keepalived是否成功可用命令
1. ip avrrp_instance VI_INET1 {
2. state MASTER
3. interface eth0
4. virtual_router_id 53
5. priority 200
6. advert_int 1
7. authentication {
8. auth_type pass
9. auth_pass yourpass
10. }
11. virtual_ipaddress {
12. 192.168.1.108
13. }
14. }
15.
16. vrrp_instance VI_INET1 {
17. state BACKUP
18. interface eth0
19. virtual_router_id 53
20. priority 100
21. advert_int 1
22. authentication {
23. auth_type pass
24. auth_pass yourpass
25. }
26. virtual_ipaddress {
27. 192.168.1.108
28. }
29. }
以上三步完成nginx負載均衡設置後,就是檢測了,大家可任意停掉其中一臺的任何服務;在正常結果中大家應該發現,其中任意一臺服務器宕機後,不影響整個系統的運作｡