Tomcat的实例配置

一、多实例配置

多实例（多进程）：同一个程序启动多次，分为两种情况:
第一种：一台机器跑多个站点；
第二种：一个机器跑一个站点多个实例，配合负载均衡。
1、复制程序文件

[root@java-tomcat1 ~]# cd /data/application/
[root@java-tomcat1 application]# ls
tomcat
[root@java-tomcat1 application]# cp -r tomcat/ tomcat_2
[root@java-tomcat1 application]# ls
tomcat  tomcat_2
修改端口，以启动多实例。多实例之间端口不能一致
[root@java-tomcat1 application]# sed -i 's#8005#8011#;s#8080#8081#' tomcat/conf/server.xml
[root@java-tomcat1 application]# sed -i 's#8005#8012#;s#8080#8082#' tomcat_2/conf/server.xml
[root@java-tomcat1 application]# sed -i 's#8009#8019#' tomcat/conf/server.xml
[root@java-tomcat1 application]# sed -i 's#8009#8029#' tomcat_2/conf/server.xml
[root@java-tomcat1 application]# diff tomcat/conf/server.xml tomcat_2/conf/server.xml  #对比文件不同之处
22c22
< <Server port="8011" shutdown="SHUTDOWN">
---
> <Server port="8012" shutdown="SHUTDOWN">
67c67
<          Define a non-SSL/TLS HTTP/1.1 Connector on port 8081
---
>          Define a non-SSL/TLS HTTP/1.1 Connector on port 8082
69c69
<     <Connector port="8081" protocol="HTTP/1.1"
---
>     <Connector port="8082" protocol="HTTP/1.1"
75c75
<                port="8081" protocol="HTTP/1.1"
---
>                port="8082" protocol="HTTP/1.1"
115,116c115,116
<     <!-- Define an AJP 1.3 Connector on port 8019 -->
<     <Connector port="8019" protocol="AJP/1.3" redirectPort="8443" />
---
>     <!-- Define an AJP 1.3 Connector on port 8029 -->
>     <Connector port="8029" protocol="AJP/1.3" redirectPort="8443" />

启动tomcat多实例：

[root@java-tomcat1 application]# cp -r /opt/webapps/ROOT/ tomcat/webapps/
[root@java-tomcat1 application]# cp -r /opt/webapps/ROOT/ tomcat_2/webapps/
[root@java-tomcat1 application]# echo 8081 >> tomcat/webapps/ROOT/index.jsp 
[root@java-tomcat1 application]# echo 8082 >> tomcat_2/webapps/ROOT/index.jsp
启动：
[root@java-tomcat1 application]# /data/application/tomcat/bin/startup.sh
[root@java-tomcat1 application]# /data/application/tomcat_2/bin/startup.sh

二、tomcat反向代理集群

1、负载均衡说明：

[root@nginx-proxy ~]# cd /etc/nginx/conf.d/
[root@nginx-proxy conf.d]# cp default.conf default.conf.bak
[root@nginx-proxy conf.d]# mv default.conf tomcat.conf
[root@nginx-proxy conf.d]# vim tomcat.conf
upstream testweb {
	server 192.168.50.114:8081 weight=1 max_fails=1 fail_timeout=2s;
	server 192.168.50.114:8082 weight=1 max_fails=1 fail_timeout=2s;
}
server {
    listen       80;
    server_name  localhost;
    access_log  /var/log/nginx/proxy.access.log  main;

    location / {
       proxy_pass http://testweb;
       proxy_set_header Host $host:$server_port;
       proxy_set_header X-Real-IP $remote_addr;
       proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        }       
    error_page   500 502 503 504  /50x.html;
    location = /50x.html {
        root   /usr/share/nginx/html;
    } 
}

重启nginx负载均衡服务器

[root@nginx-proxy ~]# systemctl start nginx