Tomcat9 运行模式更改为APR模式

Tomcat支持三种接收请求的处理方式：BIO、NIO、APR

软件版本: Tomcat9.0.85

操作系统: Rockylinux8.9

BIO由于每个请求都要创建一个线程来处理，线程开销比较大，不能再高并发的场景，性能也是最低的。
NIO是一个基于缓冲区、并能提供非阻塞I/O操作的Java API，比传统的bio更好的并发性能。
APR（Apache Portable Run-time libraries）简单理解，就是从操作系统级别解决异步IO问题，大幅度的提高服务器的处理和响应性能， 也是Tomcat运行高并发应用的首选模式。

所需软件的下载地址

https://mirrors.cloud.tencent.com/apache/apr/

tomcat-native在tomcat的bin下
* apr
* apr-iconv
* apr-util
* tomcat-native

安装依赖

yum install -y apr-devel openssl-devel gcc make expat-devel libtool 

安装软件

cd /usr/local/src
wget https://mirrors.cloud.tencent.com/apache/apr/apr-1.6.5.tar.gz
tar xf apr-1.6.5.tar.gz
cd apr-1.6.5/
./configure --prefix=/usr/local/apr
make && make install
​
cd /usr/local/src
wget https://mirrors.cloud.tencent.com/apache/apr/apr-iconv-1.2.2.tar.gz
tar xf apr-iconv-1.2.2.tar.gz
cd apr-iconv-1.2.2/
./configure --with-apr=/usr/local/apr --prefix=/usr/local/apr-iconv
make && make install
​
cd /usr/local/src
wget https://mirrors.cloud.tencent.com/apache/apr/apr-util-1.6.3.tar.gz
tar xf apr-util-1.6.3.tar.gz
cd apr-util-1.6.3/
./configure --prefix=/usr/local/apr-util --with-apr=/usr/local/apr --with-apr-iconv=/usr/local/apr-iconv/bin/apriconv
make && make install
​

wget https://mirrors.cloud.tencent.com/apache/tomcat/tomcat-connectors/native/1.2.39/source/tomcat-native-1.2.39-src.tar.gz
tar xf tomcat-native-1.2.39-src.tar.gz
./configure --prefix=/usr/local/tomcat-native --with-apr=/usr/local/apr --with-ssl=yes
make && make install
​
echo -e 'export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/usr/local/apr/lib\nexport LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/usr/local/tomcat-native/lib:$CATALINA_HOME/lib\nexport LD_RUN_PATH=$LD_RUN_PATH:/usr/local/apr/lib' >> /etc/profile
​
source /etc/profile

启用 Tomcat Native Library(上面已配置,这一步可不做)

在 $CATALINA_HOME/bin 目录下新建 setenv.sh:

LD_LIBRARY_PATH=/home/mongo/soft/tomcat-native-1.2.35/lib:$CATALINA_HOME/lib
export LD_LIBRARY_PATH

/usr/local/tomcat/bin/startup.sh

查看端口情况

[root@slave bin]# netstat  -tulnp | grep 8080
tcp6       0      0 :::8080                 :::*                    LISTEN      84309/java