Tomcat 8和10的安装和修改

2023-10-27

Tomcat10:

jdk11没有jre目录了，tomcat安装后需要做一些修改。

JAVA_HOME=/usr/local/jdk11
JAVA_BIN=$JAVA_HOME/bin
export JAVA_BIN=$JAVA_HOME/bin
#export JRE_HOME=${JAVA_HOME}/jre
export CLASSPATH=.:${JAVA_HOME}/lib:${JRE_HOME}/lib
export PATH=${JAVA_HOME}/bin:$PATH

【Tomcat】Linux环境下java11与tomcat10的安装配置_L-DiCaprio的博客-CSDN博客_linuxtomcat11

Tomcat8.5:

linux下tomcat8安装详解（附图解步骤） - 腾讯云开发者社区-腾讯云

403error:

Tomcat8.5管理页面403 Access Denied的解决方法-蒲公英云

修改堆内存
vi /usr/local/tomcat8.5/bin/catalina.sh

#   USE_NOHUP       (Optional) If set to the string true the start command will
#                   use nohup so that the Tomcat process will ignore any hangup
#                   signals. Default is "false" unless running on HP-UX in which
#                   case the default is "true"
# -----------------------------------------------------------------------------

JAVA_OPTS="-Xms1024M -Xmx2048M"

# OS specific support. $var _must_ be set to either true or false.
cygwin=false
darwin=false
os400=false
hpux=false
case "`uname`" in
CYGWIN*) cygwin=true;;
Darwin*) darwin=true;;
OS400*) os400=true;;
HP-UX*) hpux=true;;
esac

restart tomcat

check in console:

check process don't have any change.

check by jmap tool:

[root@dft1 conf]# ps -ef |grep tomcat
root 23802 1 0 11:48 pts/0 00:00:05 /usr/local/java/jdk1.8/jre/bin/java -Djava.util.logging.config.file=/usr/local/tomcat8.5/conf/logging.properties -Djava.util.logging.manager=org.apache.juli.ClassLoaderLogManager -Xms1024M -Xmx2048M -Djdk.tls.ephemeralDHKeySize=2048 -Djava.protocol.handler.pkgs=org.apache.catalina.webresources -Dorg.apache.catalina.security.SecurityListener.UMASK=0027 -Dignore.endorsed.dirs= -classpath /usr/local/tomcat8.5/bin/bootstrap.jar:/usr/local/tomcat8.5/bin/tomcat-juli.jar -Dcatalina.base=/usr/local/tomcat8.5 -Dcatalina.home=/usr/local/tomcat8.5 -Djava.io.tmpdir=/usr/local/tomcat8.5/temp org.apache.catalina.startup.Bootstrap start
root 24441 20762 0 12:14 pts/1 00:00:00 grep --color=auto tomcat
[root@dft1 conf]# jmap -heap 23802
Attaching to process ID 23802, please wait...
Debugger attached successfully.
Server compiler detected.
JVM version is 25.241-b07

using thread-local object allocation.
Parallel GC with 2 thread(s)

Heap Configuration:
   MinHeapFreeRatio         = 0
   MaxHeapFreeRatio         = 100
   MaxHeapSize              = 2147483648 (2048.0MB)
   NewSize                  = 357564416 (341.0MB)
   MaxNewSize               = 715653120 (682.5MB)
   OldSize                  = 716177408 (683.0MB)
   NewRatio                 = 2
   SurvivorRatio            = 8
   MetaspaceSize            = 21807104 (20.796875MB)
   CompressedClassSpaceSize = 1073741824 (1024.0MB)
   MaxMetaspaceSize         = 17592186044415 MB
   G1HeapRegionSize         = 0 (0.0MB)

Heap Usage:
PS Young Generation
Eden Space:
   capacity = 268435456 (256.0MB)
   used     = 134313152 (128.09100341796875MB)
   free     = 134122304 (127.90899658203125MB)
   50.03554821014404% used
From Space:
   capacity = 44564480 (42.5MB)
   used     = 0 (0.0MB)
   free     = 44564480 (42.5MB)
   0.0% used
To Space:
   capacity = 44564480 (42.5MB)
   used     = 0 (0.0MB)
   free     = 44564480 (42.5MB)
   0.0% used
PS Old Generation
   capacity = 716177408 (683.0MB)
   used     = 0 (0.0MB)
   free     = 716177408 (683.0MB)
   0.0% used

15206 interned Strings occupying 1409040 bytes.

线程修改：

<Executor name="tomcatThreadPool" namePrefix="catalina-exec-"
        maxThreads="300" minSpareThreads="200"/>

<Connector executor="tomcatThreadPool"
               port="8080" protocol="HTTP/1.1"
               connectionTimeout="20000"
               redirectPort="8443" />
    <!-- Define an SSL/TLS HTTP/1.1 Connector on port 8443
         This connector uses the NIO implementation. The default
         SSLImplementation will depend on the presence of the APR/native

检查：

最大值为-1是正常的。可以查看官方解释。

“Note that if an executor is configured any value set for this attribute will be recorded correctly but it will be reported (e.g. via JMX) as -1 to make clear that it is not used.”
如果配置了一个Executor，则该属性的任何值集将被正确记录，但是它将被显示为-1

[tomcat调优]Tomcat7中maxThreads等于-1问题_食鱼酱的博客-CSDN博客

查看当前的线程数量：
[root@dft1 bin]# ps -efL |grep java|wc -l
219

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