Tomcat 环境变量分析

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        catalina是Apache Tomcat实现的servlet容器

#

#   CATALINA_HOME   May point at your Catalina "build" directory.

#                   Tomcat安装目录，如/usr/apache-tomcat-7.0.36/

#
#   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.

#                   (可选项)默认指向CATALINA_HOME地址

#
#   CATALINA_OUT    (Optional) Full path to a file where stdout and stderr
#                   will be redirected.

#                   Default is $CATALINA_BASE/logs/catalina.out

#                   (可选项)标准输出文件全路径

#                   默认为 $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.

#                   (可选项)Java(应该是Tomcat)运行时选项, 当”start”,”run”,”debug”命令执行时使用到。

#                   包含此处和不在JAVA_OPTS中的全部选项, 仅用于Tomcat自身, 不能用于停止进程等. 

#                   例如堆大小, 垃圾回收日志, JMX端口等

#
#   CATALINA_TMPDIR (Optional) Directory path location of temporary directory
#                   the JVM should use (java.io.tmpdir).  Defaults to

#                   $CATALINA_BASE/temp.

#                   (可选项)临时文件路径地址

#                   默认为$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运行时环境安装目录, 默认指向JAVA_HOME.

#                   如果同时设置了JRE_HOME和JAVA_HOME, 使用JRE_HOME.

#
#   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.

#                   (可选项)Java运行选项, 当任何命令执行都会用到. 

#                   包含此处和不在CATALINA_OPTS中的全部选项, Tomcat会用到这些选项, 在停止进程和查看version信息时都会用到.

#                   大部分都应该进入CATALINA_OPTS设置。

#
#   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.

#                   Defaults to $CATALINA_HOME/endorsed.

#                   endorsed(被赞同的)

#                   (可选项)

#                   一些通过冒号分隔的路径的集合, 这些路径包含了一些jar包, 用于替换JCP组织之外创建的API.

#                   默认路径$CATALINA_HOME/endorsed

#
#   JPDA_TRANSPORT  (Optional) JPDA transport used when the "jpda start"

#                   command is executed. The default is "dt_socket".

#                   (可选项)

#                   JPDA: Java Platform Debugger Architecture, Java平台调试架构.

#                   JPDA传输时,当”jpda start”命令执行时用到. 

#                   默认值”dt_socket"

#
#   JPDA_ADDRESS    (Optional) Java runtime options used when the "jpda start"

#                   command is executed. The default is 8000.

#                   (可选项)

#                   Java运行时选项, 当”jpda start”命令执行时用到. 

#                   默认值8000(貌似是端口)

#
#   JPDA_SUSPEND    (Optional) Java runtime options used when the "jpda start"
#                   command is executed. Specifies whether JVM should suspend

#                   execution immediately after startup. Default is "n".

#                   (可选项)

#                   Java运行时选项, 当”jpda start”命令执行时用到. 

#                   指定了启动之后JVM是否应该立即暂停执行.

#
#   JPDA_OPTS       (Optional) Java runtime options used when the "jpda start"
#                   command is executed. If used, JPDA_TRANSPORT, JPDA_ADDRESS,
#                   and JPDA_SUSPEND are ignored. Thus, all required jpda
#                   options MUST be specified. The default is:
#
#                   -agentlib:jdwp=transport=$JPDA_TRANSPORT,
#                       address=$JPDA_ADDRESS,server=y,suspend=$JPDA_SUSPEND
#
#   CATALINA_PID    (Optional) Path of the file which should contains the pid
#                   of the catalina startup java process, when start (fork) is

#                   used

#                   (可选项)包含tomcat启动的Java进程的pid的文件路径

#
#   LOGGING_CONFIG  (Optional) Override Tomcat's logging config file
#                   Example (all one line)

#                   LOGGING_CONFIG="-Djava.util.logging.config.file=$CATALINA_BASE/conf/logging.properties"

#                   覆盖Tomcat的日志配置文件

#
#   LOGGING_MANAGER (Optional) Override Tomcat's logging manager
#                   Example (all one line)

#                   LOGGING_MANAGER="-Djava.util.logging.manager=org.apache.juli.ClassLoaderLogManager"

#                   日志管理器

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