Running Tomcat on Port 80 via a Service Wrapper
jsvc介绍：
Another way to run Tomcat on port 80 as a user other than root is use a service wrapper binary. A service wrapper is a program written in C that is meant just for this purpose: to run a Java server boundto a privilegedport on a non-Windows operating system as a user other than root. The idea is that you start the service wrapper binary as the root user, it instantiates a Java VM with Tomcat in it as a separate process that has the root-like capability of opening server sockets on privilegedports—while running as a non-root user—andTomcat opens its server socket(s) on the privilegedport(s). Then, Tomcat is no longer running as root but is serving requests over the privilegedport. jsvc (short for “Java Service”) is a native service wrapper that comes with Tomcat’s binary distribution.
1：安装jsvc
[root@localhost bin]# pwd
/opt/tomcat5.5/bin
[root@localhost bin]# tar zxvf jsvc.tar.gz
[root@localhost bin]# cd jsvc-src/
[root@localhost jsvc-src]# chmod a+x configure
[root@localhost jsvc-src]# ./configure --with-java=/usr/local/jdk
[root@localhost jsvc-src]# make
即可发现生产的jsvc位于当前目录下(.)
然后复制jsvc到/opt/tomcat5.5/bin目录下
[root@localhost jsvc-src]# cp jsvc /opt/tomcat5.5/bin
2：[root@localhost jsvc-src]# groupadd tomcat
[root@localhost jsvc-src]# useradd -g tomcat -s /sbin/nologin tomcat
[root@localhost jsvc-src]# chown -R tocmat:tomcat /opt/tomcat5.5
上面必须执行，否则会在启动tomcat时在日志文件中有如下的问题：
Java HotSpot(TM) Client VM warning: Can't detect initial thread stack location - find_vma failed
Jun 11, 2010 12:20:13 PM org.apache.catalina.startup.Catalina load
WARNING: Can't load server.xml from /opt/tomcat5.5/conf/server.xml
Jun 11, 2010 12:20:13 PM org.apache.catalina.startup.Catalina load
WARNING: Can't load server.xml from /opt/tomcat5.5/conf/server.xml
Jun 11, 2010 12:20:13 PM org.apache.catalina.startup.Catalina start
INFO: Server startup in 0 ms
Tomcat根本就启动不起来
3：修改tomcat的端口为80，
[root@localhost jsvc-src]# cat /opt/tomcat5.5/conf/server.xml | grep -n 80
30:
71: By default, a non-SSL HTTP/1.1 Connector is established on port 8080.
93:
94:
119:
125:
4：通过jsvc启动tomcat，命令如下：
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可以通过如下查询：
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显然80端口以及在监听 |
或用top命令如图：
显然jsvs已经启动
配置过程中遇到的问题：
由于没有执行chown -R tomcat: /opt/tomcat5.5启动jsvc的时候失败
出错如下：
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还有一个问题没解决：
Java HotSpot(TM) Client VM warning: Can't detect initial thread stack location - find_vma failed
后台日志会抛出如下warning。有人怀疑是java混合模式的问题，我的java版本信息如下:
[root@localhost jsvc-src]# java -version
java version "1.6.0_20"
Java(TM) SE Runtime Environment (build 1.6.0_20-b02)
Java HotSpot(TM) Client VM (build 16.3-b01, mixed mode, sharing)
我把jdk版本从1.5升级成1.6还是没有解决此问题，但不影响jsvc的使用！
关闭jsvc：
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