本文我们分享在Centos安装tomcat，然后用systemd实现tomcat多实例的方法，有需求的朋友可以认真参考一下。

系统环境: CentOS 7 x86_64

1、安装jdk

rpm -ivh jdk-8u60-linux-x64.rpm

2、创建普通用户

getent group tomcat || groupadd -r tomcat

getent passwd tomcat || useradd -r -d /opt -s /bin/nologin tomcat

3、下载tomcat 7

cd /opt

wget http://mirrors.ustc.edu.cn/apache/tomcat/tomcat-7/v7.0.64/bin/apache-tomcat-7.0.64.tar.gz

tar zxvf apache-tomcat-7.0.64.tar.gz

mv apache-tomcat-7.0.64 tomcat01

chown -R tomcat:tomcat tomcat01

tar zxvf apache-tomcat-7.0.64.tar.gz

mv apache-tomcat-7.0.64 tomcat02

chown -R tomcat:tomcat tomcat02

两个实例同时监听8080端口必然会产生冲突，所以必须修改.

sed -i 's/8080/8081/g' /opt/tomcat01/conf/server.xml

sed -i 's/8005/8001/g' /opt/tomcat01/conf/server.xml

sed -i 's/8080/8082/g' /opt/tomcat02/conf/server.xml

sed -i 's/8005/8002/g' /opt/tomcat02/conf/server.xml

AJP通常用不上，这里统一关闭

sed -i '/8009/d' /opt/tomcat01/conf/server.xml

sed -i '/8009/d' /opt/tomcat01/conf/server.xml

tomcat在Linux 下默认工作模式是bio,性能非常低,建议使用apr或者nio，

这里改为nio,即非阻塞IO,性能比较好。

sed -i.bak 's#HTTP/1.1#org.apache.coyote.http11.Http11NioProtocol#' /opt/tomcat01/conf/server.xml

sed -i.bak 's#HTTP/1.1#org.apache.coyote.http11.Http11NioProtocol#' /opt/tomcat02/conf/server.xml

4、创建启动文件

cd /usr/lib/systemd/system

cat >tomcat01.service <<EOF

[Unit]

Description=Apache Tomcat 7

After=network.target

[Service]

Type=oneshot

ExecStart=/opt/tomcat01/bin/startup.sh

ExecStop=/opt/tomcat01/bin/shutdown.sh

RemainAfterExit=yes

User=tomcat

Group=tomcat

[Install]

WantedBy=multi-user.target

EOF

tomcat02同理

sed 's/tomcat01/tomcat02/g' tomcat01.service > tomcat02.service

5、启动服务

systemctl enable tomcat01

systemctl enable tomcat02

systemctl start tomcat01

systemctl start tomcat02

6、查看进程

ps aux |grep tomcat

附上一份nginx反向代理tomcat的配置文件

proxy_cache_path /var/cache/nginx/proxy_cache levels=1:2 keys_zone=static:10m inactive=1h max_size=1g;

upstream tomcat {

ip_hash ;

#hash $remote_addr consistent;

server 127.0.0.1:8081 max_fails=1 fail_timeout=2s ;

server 127.0.0.1:8082 max_fails=1 fail_timeout=2s ; ;

keepalive 16;

}

server {

listen 80;

server_name tomcat.example.com;

charset utf-8;

access_log /var/log/nginx/tomcat.access.log main;

root /usr/share/nginx/html;

index index.html index.htm index.jsp;

location / {

proxy_pass http://tomcat;

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_cache_use_stale error timeout invalid_header updating http_500 http_502 http_503 http_504;

proxy_connect_timeout 300;

proxy_send_timeout 300;

proxy_read_timeout 300;

proxy_http_version 1.1;

proxy_set_header Connection "";

add_header X-Backend "$upstream_addr";

}

location ~* ^.+.(js|css|ico|gif|jpg|jpeg|png)$ {

proxy_pass http://tomcat ;

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_cache_use_stale error timeout invalid_header updating http_500 http_502 http_503 http_504;

proxy_connect_timeout 300;

proxy_send_timeout 300;

proxy_read_timeout 300;

proxy_http_version 1.1;

proxy_set_header Connection "";

proxy_cache static;

proxy_cache_key $host$uri$is_args$args;

proxy_cache_valid 200 302 5m;

proxy_cache_valid 404 1m;

proxy_cache_valid any 1h;

add_header X-Cache $upstream_cache_status;

#log_not_found off;

#access_log off;

expires max;

}

location ~ /.ht {

deny all;

}

}