文章目录

• tomcat调优
• tomcat监控

tomcat调优

vi catalina.sh

# -----------------------------------------------------------------------------
# Control Script for the CATALINA Server
#
# Environment Variable Prerequisites
#
#   Do not set the variables in this script. Instead put them into a script
#   setenv.sh in CATALINA_BASE/bin to keep your customizations separate.
#
#   CATALINA_HOME   May point at your Catalina "build" directory.
#
#   CATALINA_BASE   (Optional) Base directory for resolving dynamic portions
#                   of a Catalina installation.  If not present, resolves to
#                   the same directory that CATALINA_HOME points to.
#
#   CATALINA_OUT    (Optional) Full path to a file where stdout and stderr
#                   will be redirected.
#                   Default is $CATALINA_BASE/logs/catalina.out
#
#   CATALINA_OPTS   (Optional) Java runtime options used when the "start",
#                   "run" or "debug" command is executed.
#                   Include here and not in JAVA_OPTS all options, that should
#                   only be used by Tomcat itself, not by the stop process,
#                   the version command etc.
#                   Examples are heap size, GC logging, JMX ports etc.
#
#   CATALINA_TMPDIR (Optional) Directory path location of temporary directory
#                   the JVM should use (java.io.tmpdir).  Defaults to
#                   $CATALINA_BASE/temp.
#
#   JAVA_HOME       Must point at your Java Development Kit installation.
#                   Required to run the with the "debug" argument.
#
#   JRE_HOME        Must point at your Java Runtime installation.
#                   Defaults to JAVA_HOME if empty. If JRE_HOME and JAVA_HOME
#                   are both set, JRE_HOME is used.
#
#   JAVA_OPTS       (Optional) Java runtime options used when any command
#                   is executed.
#                   Include here and not in CATALINA_OPTS all options, that
#                   should be used by Tomcat and also by the stop process,
#                   the version command etc.
#                   Most options should go into CATALINA_OPTS.
#
#   JAVA_ENDORSED_DIRS (Optional) Lists of of colon separated directories
#                   containing some jars in order to allow replacement of APIs
#                   created outside of the JCP (i.e. DOM and SAX from W3C).
#                   It can also be used to update the XML parser implementation.
#                   Note that Java 9 no longer supports this feature.
#                   Defaults to $CATALINA_HOME/endorsed.
#
#   JPDA_TRANSPORT  (Optional) JPDA transport used when the "jpda start"
#                   command is executed. The default is "dt_socket".
#

catalina这个脚本会读取很多参数：

• CATALINA_HOME tomcat的安装目录

• CATALINA_BASE tomcat的工作目录
  如果我们想要运行Tomcat的 多个实例，但是不想安装多个Tomcat软件副本。那么我们可以配置多个工作目录，每个运行实例独占一个工作目录，但是共享同一个安装目录。

• CATALINA_OPTS catalina运行时的参数 heap size 、GC logging、JMX ports etc

• JAVA_OPTS java运行时的参数 heap size 、GC logging、JMX ports etc
  两者的区别：
  在Tomcat的catalina.sh文件中的启停server脚本中都应用到了两个变量： CATALINA_OPTS和JAVA_OPTS。用于保存Tomcat运行所需的各种参数。
  他们在文件中的注释如下：
  （可选）Java 执行"start","stop"或"run"命令时用到的运行时参数； [JAVA_OPTS]
  （可选）Java 执行"start"或"run"命令时用到的运行时参数； [CATALINA_OPTS]
  那么，为什么有两个不同的变量？他们有什么区别？
  首先，定义在这两个变量中的参数都会被传递到启动Tomcat的命令：“start"和"run”，只有定义在JAVA_OPTS中的参数会被传递到"stop"命令。
  所以将参数定义到哪个变量中并不影响Tomcat的启动和运行，而只影响到了Tomcat的运行结束。
  第二种区别更加微妙。其他应用程序也可以使用JAVA_OPTS，但Tomcat只会用到CATALINA_OPTS。所以如果你只使用了Tomcat，在设置环境变量时，你最好使用CATALINA_OPTS，而如果你同时也用到了其他java应用程序，如JBoss，在设置环境变量时你应该使用JAVA_OPTS。
  原文：https://www.cnblogs.com/yaowen/p/9722241.html

if $cygwin; then
  [ -n "$JAVA_HOME" ] && JAVA_HOME=`cygpath --unix "$JAVA_HOME"`
  [ -n "$JRE_HOME" ] && JRE_HOME=`cygpath --unix "$JRE_HOME"`
  [ -n "$CATALINA_HOME" ] && CATALINA_HOME=`cygpath --unix "$CATALINA_HOME"`
  [ -n "$CATALINA_BASE" ] && CATALINA_BASE=`cygpath --unix "$CATALINA_BASE"`
  [ -n "$CLASSPATH" ] && CLASSPATH=`cygpath --path --unix "$CLASSPATH"`
fi

发现脚本是可以自动获取这些值的

 exec "$_RUNJDB" "$LOGGING_CONFIG" $LOGGING_MANAGER $JAVA_OPTS $CATALINA_OPTS \
        -D$ENDORSED_PROP="$JAVA_ENDORSED_DIRS" \
        -classpath "$CLASSPATH" \
        -sourcepath "$CATALINA_HOME"/../../java \
        -Djava.security.manager \
        -Djava.security.policy=="$CATALINA_BASE"/conf/catalina.policy \
        -Dcatalina.base="$CATALINA_BASE" \
        -Dcatalina.home="$CATALINA_HOME" \
        -Djava.io.tmpdir="$CATALINA_TMPDIR" \
        org.apache.catalina.startup.Bootstrap "$@" start

根据这些参数$JAVA_OPTS $CATALINA_OPTS 来启动tomcat

所以只需要在前面添加：
例如：

//其他的参数也同理
export JAVA_OPTS="-Xms:100m -Xmx:2048m"

后面会自动读取

tomcat监控

jps
xxxx Bootstrap

//1s打印一次
jstat -gc xxxx 1s

标签：CATALINA,JAVA,Tomcat,差评,BASE,调优,HOME,OPTS
来源： https://blog.csdn.net/dataiyangu/article/details/89076245