生产中tomcat的各种问题优化

1、修改或隐藏tomcat的版本号

cd /usr/local/tomcat/lib/

unzip catalina.jar

vim org/apache/catalina/util/ServerInfo.properties
 16 server.info=Apache Tomcat/8.5.64
 17 server.number=8.5.64.0
 18 server.built=Mar 4 2021 23:14:16 UTC      
 
jar uvf catalina.jar org/apache/catalina/util/ServerInfo.properties 

#重启tomcat
systemctl restart tomcat

2、隐藏tomcat的错误信息

vim /usr/local/tomcat/conf/server.xml 

<Host name="localhost"  appBase="webapps" 
      unpackWARs="true" autoDeploy="true">

#在Host位置内部插入下面
<Valve className="org.apache.catalina.valves.ErrorReportValve" showReport="false" showServerInfo="false" />
#或者如下：
<Valve className="org.apache.catalina.valves.ErrorReportValve" showReport="false" showServerInfo="false" errorCode.400="webapps/error.html"></Valve>
        <Valve className="org.apache.catalina.valves.ErrorReportValve" showReport="false" showServerInfo="false" errorCode.404="webapps/error.html"></Valve>
        <Valve className="org.apache.catalina.valves.ErrorReportValve" showReport="false" showServerInfo="false" errorCode.500="webapps/error.html"></Valve>
        
</Host>

#重启tomcat
systemctl restart tomcat

3、tomcat的jvm优化

vim /usr/local/tomcat/bin/catalina.sh 

放在起始位置就可：

JAVA_OPTS="-Xms4096m -Xmx4096m -Xss512K -XX:+HeapDumpOnOutOfMemoryError -XX:HeapDumpPath=./yzil_error.hprof"

或着全面如下：
JAVA_OPTS="-server -Xms4g -Xmx4g -Xss512k -Xmn1g -XX:CMSInitiatingOccupancyFraction=65 -XX:+AggressiveOpts -XX:+UseBiasedLocking -XX:+DisableExplicitGC -XX:MaxTenuringThreshold=10 -XX:NewRatio=2 -XX:PermSize=128m -XX:MaxPermSize=512m -XX:CMSFullGCsBeforeCompaction=5 -XX:+ExplicitGCInvokesConcurrent -XX:+UseConcMarkSweepGC -XX:+UseParNewGC -XX:+CMSParallelRemarkEnabled -XX:+UseCMSCompactAtFullCollection -XX:LargePageSizeInBytes=128m -XX:+UseFastAccessorMethods"

4、tomcat加supervisor守护

yum install -y supervisor
systemctl enable --now supervisord

cat /etc/supervisord.d/tomcat.ini

[program:tomcat]
command=/usr/local/tomcat/bin/catalina.sh  run
directory=/usr/local/tomcat/bin/
environment=JAVA_HOME="/usr/local/jdk/",JAVA_BIN="/usr/local/jdk/bin"
autostart=true
autorestart=true
startsecs=10
startretries=3
user=root
#stderr_logfile=/var/logs/tomcat/tomcat_out.log ;
#stdout_logfile=/var/logs/tomcat/tomcat_out.log ;
stopsignal=INT
stopasgroup=true