miaosha/docs/tomcat-good.md

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xiu修改### 秒杀tomcat优化
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##要求:
> 本文以tomcat8.5.20为准
>目标
1.内存优化
2.并发优化
3.APR优化
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#### [APR优化相关包](/docs/tools)
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1.**内存优化**
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内存优化catalina
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JAVA_OPTS="-server -Xms2048M -Xmx2048M -XX:+HeapDumpOnOutOfMemoryError
-XX:HeapDumpPath=$CATALINA_HOME/logs/heap.dump"
# Register custom URL handlers
server.xml 配置
maxConnections="300"
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acceptCount="200"
maxThreads="400"
minSpareThreads="200"/>
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禁用
<!-- Define an AJP 1.3 Connector on port 8009
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<Connector port="8009" protocol="AJP/1.3" redirectPort="8443" />-->
${tomcat}/webapps/docs/config/host.html
autoDeployThis flag value indicates if Tomcat should check periodically for new or updated web applications while Tomcat is running
${tomcat}/webapps/docs/config/http.html
enableLookupsfalse
${tomcat}/webapps/docs/config/context.html:
reloadablefalse
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2.**如果你的网站具有高并发那么建议使用APR模式**
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http://apr.apache.org/
依赖:
>>APR 1.2+ development headers (libapr1-dev package)
>>OpenSSL 1.0.2+ development headers (libssl-dev package)
>>JNI headers from Java compatible JDK 1.4+
>>GNU development environment (gcc, make)
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yum install apr* openssl-devel gcc make
tar zxvf apr-1.4.5.tar
cd apr-1.4.5
./configure --prefix=/usr/local/apr
make
make install
tar -zxvf apr-iconv-1.2.1.tar.gz
cd apr-iconv-1.2.1
./configure --prefix=/usr/local/apr-iconv --with-apr=/usr/local/apr
make
make install
yum install expat-devel
tar zxvf apr-util-1.3.12.tar.gz
cd apr-util-1.3.12
./configure --prefix=/usr/local/apr-util --with-apr=/usr/local/apr
make
make install
安装openssl 1.0.2
./config --prefix=/usr/local/openssl
修改Makefile
vi Makefile
将原来的CFLAG= -DOPENSSL_THREADS
修改为: CFLAG= -fPIC -DOPENSSL_THREADS
也就是添加-fPIC
执行执行:
make && make install
cd bin
tar -zxvf tomcat-native.tar.gz
cd tomcat-native-1.2.12-src
cd native
./configure --with-apr=/usr/local/apr --with-ssl=/usr/local/openssl
make
make install
catalina.sh
JAVA_OPTS="$JAVA_OPTS -Djava.library.path=/usr/local/apr/lib
注意开启了apr之后jvm用到的native内存会增大因此要适当调大Metaspace空间,添加JVM选项-XX:MetaspaceSize=128m
JAVA_OPTS="-server -Xms2048M -Xmx2048M -XX:MetaspaceSize=128M -XX:+HeapDumpOnOutOfMemoryError -XX:HeapDumpPath=$CATALINA_HOME/logs/heap.dump"
server.xml
<Connector port="8080" protocol="org.apache.coyote.http11.Http11AprProtocol"
connectionTimeout="20000"
redirectPort="8443" />
<Listener className="org.apache.catalina.core.AprLifecycleListener" SSLEngine="off" />