APR(Apache Portable Runtime)实现操作系统级别控制，大大提高并发处理能力;但需要安装apr和tomcat-native库；

(1)安装apr

这里我用的是tomcat9，需要较新版本的apr,所以我这里采用源码的安装方式进入http://apr.apache.org/download.cgi 下载需要的apr 与apr-utilwget -c wget -c wget -c

mkdir -p /usr/local/apr-1.6.5

mkdir -p /usr/local/apr-iconv-1.2.2mkdir -p /usr/local/apr-util-1.6.1

tar -zxvf apr-1.6.5.tar.gz

这个版本的apr可能需要修改一下configure,大概在43167行那里注释掉$RM "$cfgfile"vi configure# $RM "$cfgfile"./configure --prefix=/usr/local/apr-1.6.5makemake install

tar -zxvf apr-iconv-1.2.2.tar.gz

cd apr-iconv-1.2.2./configure --prefix=/usr/local/apr-iconv-1.2.2 --with-apr=/usr/local/apr-1.6.5

tar -zxvf apr-util-1.6.1.tar.gz

cd apr-util-1.6.1./configure --prefix=/usr/local/apr-util-1.6.1 --with-apr=/usr/local/apr-1.6.5 --with-apr-iconv=../apr-iconv-1.2.2makemake install

先配置几个环境变量

向/etc/profile添加下面几行export CATALINA_HOME=/home/tomcatexport JAVA_HOME=/usr/lib/jvm/java-1.8.0-openjdk.x86_64/export CLASSPATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jarexport PATH=$JAVA_HOME/bin:$PATH:/usr/local/apr-1.6.5/bin:/usr/local/apr-util-1.6.1/binexport LD_LIBRARY_PATH=$LD_LIBRARY_PATH:$CATALINA_HOME/lib:/usr/local/apr-1.6.5/lib/:/usr/local/apr-util-1.6.1/lib然后source /etc/profile 注意JAVA_HOME一定要配置成自己的，你可以先通过ls -al /usr/lib/jvm/ 来查看找到路径配入

(2)安装tomcat-native

先安装较新的openssl

mkdir -p /usr/local/openssl-1.1.2wget -c unzip master.zipcd openssl-master./config --prefix=/usr/local/openssl-1.1.2make make install

在tomcat的安装目录下就有bin/tomcat-native.tar.gz，进入tomcat的安装目录

tar -zxvf tomcat-native.tar.gzcd tomcat-native-1.2.17-src/native然后就可以编译安装了./configure --with-apr=/usr/local/apr-1.6.5 --with-ssl=/usr/local/openssl-1.1.2

(3)配置tomcat引入apr

向conf/server.xml添加<Listener className="org.apache.catalina.core.AprLifecycleListener" useAprConnector="true" SSLEngine="on" />如果要看上面参数的意思可以参考

ln -s /usr/local/apr/lib/libtcnative-1.so /usr/lib64/libtcnative-1.so

再修改/etc/profile

export PATH=$JAVA_HOME/bin:$PATH:/usr/local/apr-1.6.5/bin:/usr/local/apr-util-1.6.1/bin:/usr/local/apr/binexport LD_LIBRARY_PATH=$LD_LIBRARY_PATH:$CATALINA_HOME/lib:/usr/local/apr-1.6.5/lib/:/usr/local/apr-util-1.6.1/lib:/usr/local/apr/lib然后source /etc/profile

最后再重启tomcat

sudo -u tomcat service tomcat start -security

再进入tomcat安装目录下的/logs目录下

cat catalina.2018-10-21.log 如果有出现org.apache.catalina.core.AprLifecycleListener.lifecycleEvent Loaded APR based Apache Tomcat Native library [1.2.17] using APR version [1.6.5].org.apache.catalina.core.AprLifecycleListener.lifecycleEvent APR capabilities: IPv6 [true], sendfile [true], accept filters [false], random [true].org.apache.catalina.core.AprLifecycleListener.lifecycleEvent APR/OpenSSL configuration: useAprConnector [false], useOpenSSL [true]org.apache.catalina.core.AprLifecycleListener.initializeSSL OpenSSL successfully initialized [OpenSSL 1.1.2-dev xx XXX xxxx]...org.apache.coyote.AbstractProtocol.init Initializing ProtocolHandler ["http-apr-8080"]org.apache.coyote.AbstractProtocol.init Initializing ProtocolHandler ["ajp-apr-8009"]...org.apache.coyote.AbstractProtocol.start Starting ProtocolHandler ["http-apr-8080"]org.apache.coyote.AbstractProtocol.start Starting ProtocolHandler ["ajp-apr-8009"]就说明安装成功了，完毕！