1、tomcat集群
利用nginx对请求进行分流，将请求平均的分给不同的tomcat去处理，减少单个tomcat的负载量，提高tomcat的响应速度。
2、创建多个tomcat服务器（同一个服务器上）
① 先安装配置好1个tomcat服务器
安装tomcat： http://www.cnblogs.com/origalom/p/7643425.html
以普通用户运行tomcat：http://www.cnblogs.com/origalom/p/7666897.html
② 将安装好的tomcat复制一份
1 cd /usr/local/tomcat/ # 进入tomcat所在目录 2 cp -r tomcat8080/ tomcat8081 # 复制一份新的tomcat 3 chown -R tomcat:tomcat tomcat8081/ # 修改tomcat目录的所有者
③ 修改daemon.sh
如果在创建tomcat时，在daemon.sh中设置了CATALINA_HOME等变量，则新拷贝的tomcat需要将这些变量设置成新的地址。
④ 修改端口，让新的tomcat可以正常运行
vim tomcat8081/conf/server.xml
修改tomcat内部的端口，使用一个未使用的端口号，一般可以往上加一：
第22行的8005端口： <Server port="8005" shutdown="SHUTDOWN">
第69行的8080端口：
<Connector port="8080" protocol="HTTP/1.1"
connectionTimeout="20000"
redirectPort="8443" />
第116行的8009端口： <Connector port="8009" protocol="AJP/1.3" redirectPort="8443" />
⑤ 修改tomcat项目的运行根目录
修改server.xml，将148行的appBase中的webapps改成项目所在地址：
<Host name="localhost" appBase="/usr/local/tomcat/tomcat8080/webapps"
unpackWARs="true" autoDeploy="true">
⑥ 启动tomcat，检查是否启动成功
sudo tomcat8081/bin/daemon.sh start
3、配置nginx负载均衡
配置nginx.conf配置文件。
1 user nginx;
2 worker_processes 1;
3
4 error_log logs/error.log;
5 error_log logs/error.log notice;
6 error_log logs/error.log info;
7
8 pid logs/nginx.pid;
9
10
11 events {
12 worker_connections 1024;
13 }
14
15
16 http {
17 include mime.types;
18 default_type application/octet-stream;
19
20 #log_format main '$remote_addr - $remote_user [$time_local] "$request" '
21 # '$status $body_bytes_sent "$http_referer" '
22 # '"$http_user_agent" "$http_x_forwarded_for"';
23
24 #access_log logs/access.log main;
25
26 server_names_hash_bucket_size 256;
27 fastcgi_connect_timeout 300;
28 fastcgi_send_timeout 300;
29 fastcgi_read_timeout 300;
30 fastcgi_buffer_size 64k;
31 fastcgi_buffers 8 128k;
32 fastcgi_busy_buffers_size 256k;
33 fastcgi_temp_file_write_size 256k;
34 server_tokens off;
35 send_timeout 60;
36 sendfile on;
37 tcp_nopush on;
38 tcp_nodelay on;
39 keepalive_timeout 65;
40 client_header_timeout 3m;
41 client_body_timeout 3m;
42 client_max_body_size 2000m;
43 gzip on;
44
45 # tomcat集群
46 #
47 upstream tomcat {
48 server 127.0.0.1:8080;
49 server 127.0.0.1:8081;
50 }
51
52
53 # HTTPS服务器
54 #
55 server {
56 listen 80;
57 listen 443 ssl;
58 server_name www.origal.cn;
59
60 ssl_certificate /usr/local/nginx/conf/ssl/214324938610703.pem;
61 ssl_certificate_key /usr/local/nginx/conf/ssl/214324938610703.key;
62 ssl_session_cache shared:SSL:1m;
63 ssl_session_timeout 5m;
64 ssl_ciphers HIGH:!aNULL:!MD5;
65 ssl_prefer_server_ciphers on;
66
67 location / {
68 index index.jsp;
69
70 proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
71 proxy_set_header Host $http_host;
72 proxy_set_header X-Forwarded-Proto https;
73 proxy_redirect off;
74 client_max_body_size 500m;
75 client_body_buffer_size 3m;
76 proxy_connect_timeout 90;
77 proxy_read_timeout 90;
78 proxy_buffer_size 4k;
79 proxy_buffers 6 32k;
80 proxy_busy_buffers_size 64k;
81 proxy_temp_file_write_size 64k;
82
83 if (!-e $request_filename) {
84 proxy_pass http://tomcat;
85 }
86 }
87
88 # 静态资源直接访问
89 location ~ \.(js|css|png|gif|jpg|jpeg|mp4|mp3|mpg|3gp|txt)$ {
90 root /usr/local/java/tomcat8080/webapps/;
91 if (!-e $request_filename) {
92 proxy_pass http://tomcat;
93 }
94 }
95 }
96 }
来源：https://www.cnblogs.com/origalom/p/7821677.html