Tomcat
- 一、安装部署Tomcat
- 1、Tomcat概述
- 2.Tomcat核心组件
- 3、Tomcat处理请求过程
- 4、tomcat部署步骤
- 二 、实验
- 1、安装部署tomcat
- 2、优化tomcat启动速度
- 3、虚拟主机配置
- 三、Tomcat 配置文件参数优化
一、安装部署Tomcat
1、Tomcat概述
1、免费的、开放源代码的Web应用服务器
2、Apache软件基金会(Apache Software Foundation)Jakarta项目中的-个核心项目
3、由Apache、Sun和一 些公司及个人共同开发而成
4、深受Java爱好者的喜爱，并得到部分软件开发商的认可
5、目前比较流行的Web应用服务器
2.Tomcat核心组件
Tomcat
- Web容器：Web服务器
- Servlet容器：名为catalina,处理Servlet代码
- JSP容器：将JSP动态网页翻译成Servlet代码
3、Tomcat处理请求过程
tomcat中默认端口是8080
4、tomcat部署步骤
1、下载并安装JDK
2、安装并启动Tomcat
3、配置虚拟主机
二 、实验
1、安装部署tomcat
拖入软件包 [root@localhost ~]# ls anaconda-ks.cfg initial-setup-ks.cfg 公共 视频 文档 音乐 apache-tomcat-9.0.16.tar.gz jdk-8u201-linux-x64.rpm 模板 图片 下载 桌面 [root@localhost ~]# iptables -F [root@localhost ~]# setenforce 0 [root@localhost ~]# java -version //linux系统自带Java简易版openjdk openjdk version "1.8.0_181" OpenJDK Runtime Environment (build 1.8.0_181-b13) OpenJDK 64-Bit Server VM (build 25.181-b13, mixed mode) [root@localhost ~]# rpm -ivh jdk-8u201-linux-x64.rpm //安装jdk 警告：jdk-8u201-linux-x64.rpm: 头V3 RSA/SHA256 Signature, 密钥 ID ec551f03: NOKEY 准备中... ################################# [100%] 正在升级/安装... 1:jdk1.8-2000:1.8.0_201-fcs ################################# [100%] Unpacking JAR files... tools.jar... plugin.jar... javaws.jar... deploy.jar... rt.jar... jsse.jar... charsets.jar... localedata.jar... 设置jdk环境变量 [root@localhost ~]# cd /usr/java/ [root@localhost java]# ls default jdk1.8.0_201-amd64 latest [root@localhost java]# cd jdk1.8.0_201-amd64/ [root@localhost jdk1.8.0_201-amd64]# pwd //查看路径 /usr/java/jdk1.8.0_201-amd64 [root@localhost jdk1.8.0_201-amd64]# ls bin javafx-src.zip LICENSE release THIRDPARTYLICENSEREADME.txt COPYRIGHT jre man src.zip include lib README.html THIRDPARTYLICENSEREADME-JAVAFX.txt [root@localhost jdk1.8.0_201-amd64]# vim /etc/profile export JAVA_HOME=/usr/java/jdk1.8.0_201-amd64 export CLASSPATH=$JAVA_HOME/lib/tools.jar:$JAVA_HOME/lib/dt.jar export PATH=$JAVA_HOME/bin:$PATH [root@localhost jdk1.8.0_201-amd64]# source /etc/profile [root@localhost jdk1.8.0_201-amd64]# java -version java version "1.8.0_201" Java(TM) SE Runtime Environment (build 1.8.0_201-b09) Java HotSpot(TM) 64-Bit Server VM (build 25.201-b09, mixed mode) [root@localhost jdk1.8.0_201-amd64]# cd ~ [root@localhost ~]# tar zxvf apache-tomcat-9.0.16.tar.gz -C /usr/local/ [root@localhost ~]# cd /usr/local/ [root@localhost local]# ls apache-tomcat-9.0.16 bin etc games include lib lib64 libexec sbin share src [root@localhost local]# mv apache-tomcat-9.0.16/ tomcat //修改名字 [root@localhost local]# ls bin etc games include lib lib64 libexec sbin share src tomcat [root@localhost local]# cd tomcat/ [root@localhost tomcat]# ls bin conf lib logs README.md RUNNING.txt webapps BUILDING.txt CONTRIBUTING.md LICENSE NOTICE RELEASE-NOTES temp work [root@localhost tomcat]# cd bin/ [root@localhost bin]# ls bootstrap.jar commons-daemon.jar digest.sh shutdown.sh tool-wrapper.sh catalina.bat commons-daemon-native.tar.gz makebase.bat startup.bat version.bat catalina.sh configtest.bat makebase.sh startup.sh version.sh catalina-tasks.xml configtest.sh setclasspath.bat tomcat-juli.jar ciphers.bat daemon.sh setclasspath.sh tomcat-native.tar.gz ciphers.sh digest.bat shutdown.bat tool-wrapper.bat [root@localhost bin]# ln -s /usr/local/tomcat/bin/startup.sh /usr/bin/ [root@localhost bin]# ln -s /usr/local/tomcat/bin/shutdown.sh /usr/bin/ [root@localhost bin]# startup.sh //开启服务 Using CATALINA_BASE: /usr/local/tomcat Using CATALINA_HOME: /usr/local/tomcat Using CATALINA_TMPDIR: /usr/local/tomcat/temp Using JRE_HOME: /usr/java/jdk1.8.0_201-amd64 Using CLASSPATH: /usr/local/tomcat/bin/bootstrap.jar:/usr/local/tomcat/bin/tomcat-juli.jar [root@localhost bin]# netstat -antp | grep 8080 tcp6 0 0 :::8080 :::* LISTEN 81243/java 浏览器登录192.168.200.70:8080登录成功拖入软件包 [root@localhost ~]# ls anaconda-ks.cfg initial-setup-ks.cfg 公共 视频 文档 音乐 apache-tomcat-9.0.16.tar.gz jdk-8u201-linux-x64.rpm 模板 图片 下载 桌面 [root@localhost ~]# iptables -F [root@localhost ~]# setenforce 0 [root@localhost ~]# java -version //linux系统自带Java简易版openjdk openjdk version "1.8.0_181" OpenJDK Runtime Environment (build 1.8.0_181-b13) OpenJDK 64-Bit Server VM (build 25.181-b13, mixed mode) [root@localhost ~]# rpm -ivh jdk-8u201-linux-x64.rpm //安装jdk 警告：jdk-8u201-linux-x64.rpm: 头V3 RSA/SHA256 Signature, 密钥 ID ec551f03: NOKEY 准备中... ################################# [100%] 正在升级/安装... 1:jdk1.8-2000:1.8.0_201-fcs ################################# [100%] Unpacking JAR files... tools.jar... plugin.jar... javaws.jar... deploy.jar... rt.jar... jsse.jar... charsets.jar... localedata.jar... 设置jdk环境变量 [root@localhost ~]# cd /usr/java/ [root@localhost java]# ls default jdk1.8.0_201-amd64 latest [root@localhost java]# cd jdk1.8.0_201-amd64/ [root@localhost jdk1.8.0_201-amd64]# pwd //查看路径 /usr/java/jdk1.8.0_201-amd64 [root@localhost jdk1.8.0_201-amd64]# ls bin javafx-src.zip LICENSE release THIRDPARTYLICENSEREADME.txt COPYRIGHT jre man src.zip include lib README.html THIRDPARTYLICENSEREADME-JAVAFX.txt [root@localhost jdk1.8.0_201-amd64]# vim /etc/profile export JAVA_HOME=/usr/java/jdk1.8.0_201-amd64 export CLASSPATH=$JAVA_HOME/lib/tools.jar:$JAVA_HOME/lib/dt.jar export PATH=$JAVA_HOME/bin:$PATH [root@localhost jdk1.8.0_201-amd64]# source /etc/profile [root@localhost jdk1.8.0_201-amd64]# java -version java version "1.8.0_201" Java(TM) SE Runtime Environment (build 1.8.0_201-b09) Java HotSpot(TM) 64-Bit Server VM (build 25.201-b09, mixed mode) [root@localhost jdk1.8.0_201-amd64]# cd ~ [root@localhost ~]# tar zxvf apache-tomcat-9.0.16.tar.gz -C /usr/local/ [root@localhost ~]# cd /usr/local/ [root@localhost local]# ls apache-tomcat-9.0.16 bin etc games include lib lib64 libexec sbin share src [root@localhost local]# mv apache-tomcat-9.0.16/ tomcat //修改名字 [root@localhost local]# ls bin etc games include lib lib64 libexec sbin share src tomcat [root@localhost local]# cd tomcat/ [root@localhost tomcat]# ls bin conf lib logs README.md RUNNING.txt webapps BUILDING.txt CONTRIBUTING.md LICENSE NOTICE RELEASE-NOTES temp work [root@localhost tomcat]# cd bin/ [root@localhost bin]# ls bootstrap.jar commons-daemon.jar digest.sh shutdown.sh tool-wrapper.sh catalina.bat commons-daemon-native.tar.gz makebase.bat startup.bat version.bat catalina.sh configtest.bat makebase.sh startup.sh version.sh catalina-tasks.xml configtest.sh setclasspath.bat tomcat-juli.jar ciphers.bat daemon.sh setclasspath.sh tomcat-native.tar.gz ciphers.sh digest.bat shutdown.bat tool-wrapper.bat [root@localhost bin]# ln -s /usr/local/tomcat/bin/startup.sh /usr/bin/ [root@localhost bin]# ln -s /usr/local/tomcat/bin/shutdown.sh /usr/bin/ [root@localhost bin]# startup.sh //开启服务 Using CATALINA_BASE: /usr/local/tomcat Using CATALINA_HOME: /usr/local/tomcat Using CATALINA_TMPDIR: /usr/local/tomcat/temp Using JRE_HOME: /usr/java/jdk1.8.0_201-amd64 Using CLASSPATH: /usr/local/tomcat/bin/bootstrap.jar:/usr/local/tomcat/bin/tomcat-juli.jar [root@localhost bin]# netstat -antp | grep 8080 tcp6 0 0 :::8080 :::* LISTEN 81243/java 浏览器登录192.168.200.70:8080登录成功拖入软件包 [root@localhost ~]# ls anaconda-ks.cfg initial-setup-ks.cfg 公共 视频 文档 音乐 apache-tomcat-9.0.16.tar.gz jdk-8u201-linux-x64.rpm 模板 图片 下载 桌面 [root@localhost ~]# iptables -F [root@localhost ~]# setenforce 0 [root@localhost ~]# java -version //linux系统自带Java简易版openjdk openjdk version "1.8.0_181" OpenJDK Runtime Environment (build 1.8.0_181-b13) OpenJDK 64-Bit Server VM (build 25.181-b13, mixed mode) [root@localhost ~]# rpm -ivh jdk-8u201-linux-x64.rpm //安装jdk 警告：jdk-8u201-linux-x64.rpm: 头V3 RSA/SHA256 Signature, 密钥 ID ec551f03: NOKEY 准备中... ################################# [100%] 正在升级/安装... 1:jdk1.8-2000:1.8.0_201-fcs ################################# [100%] Unpacking JAR files... tools.jar... plugin.jar... javaws.jar... deploy.jar... rt.jar... jsse.jar... charsets.jar... localedata.jar... 设置jdk环境变量 [root@localhost ~]# cd /usr/java/ [root@localhost java]# ls default jdk1.8.0_201-amd64 latest [root@localhost java]# cd jdk1.8.0_201-amd64/ [root@localhost jdk1.8.0_201-amd64]# pwd //查看路径 /usr/java/jdk1.8.0_201-amd64 [root@localhost jdk1.8.0_201-amd64]# ls bin javafx-src.zip LICENSE release THIRDPARTYLICENSEREADME.txt COPYRIGHT jre man src.zip include lib README.html THIRDPARTYLICENSEREADME-JAVAFX.txt [root@localhost jdk1.8.0_201-amd64]# vim /etc/profile export JAVA_HOME=/usr/java/jdk1.8.0_201-amd64 export CLASSPATH=$JAVA_HOME/lib/tools.jar:$JAVA_HOME/lib/dt.jar export PATH=$JAVA_HOME/bin:$PATH [root@localhost jdk1.8.0_201-amd64]# source /etc/profile [root@localhost jdk1.8.0_201-amd64]# java -version java version "1.8.0_201" Java(TM) SE Runtime Environment (build 1.8.0_201-b09) Java HotSpot(TM) 64-Bit Server VM (build 25.201-b09, mixed mode) [root@localhost jdk1.8.0_201-amd64]# cd ~ [root@localhost ~]# tar zxvf apache-tomcat-9.0.16.tar.gz -C /usr/local/ [root@localhost ~]# cd /usr/local/ [root@localhost local]# ls apache-tomcat-9.0.16 bin etc games include lib lib64 libexec sbin share src [root@localhost local]# mv apache-tomcat-9.0.16/ tomcat //修改名字 [root@localhost local]# ls bin etc games include lib lib64 libexec sbin share src tomcat [root@localhost local]# cd tomcat/ [root@localhost tomcat]# ls bin conf lib logs README.md RUNNING.txt webapps BUILDING.txt CONTRIBUTING.md LICENSE NOTICE RELEASE-NOTES temp work [root@localhost tomcat]# cd bin/ [root@localhost bin]# ls bootstrap.jar commons-daemon.jar digest.sh shutdown.sh tool-wrapper.sh catalina.bat commons-daemon-native.tar.gz makebase.bat startup.bat version.bat catalina.sh configtest.bat makebase.sh startup.sh version.sh catalina-tasks.xml configtest.sh setclasspath.bat tomcat-juli.jar ciphers.bat daemon.sh setclasspath.sh tomcat-native.tar.gz ciphers.sh digest.bat shutdown.bat tool-wrapper.bat [root@localhost bin]# ln -s /usr/local/tomcat/bin/startup.sh /usr/bin/ [root@localhost bin]# ln -s /usr/local/tomcat/bin/shutdown.sh /usr/bin/ [root@localhost bin]# startup.sh //开启服务 Using CATALINA_BASE: /usr/local/tomcat Using CATALINA_HOME: /usr/local/tomcat Using CATALINA_TMPDIR: /usr/local/tomcat/temp Using JRE_HOME: /usr/java/jdk1.8.0_201-amd64 Using CLASSPATH: /usr/local/tomcat/bin/bootstrap.jar:/usr/local/tomcat/bin/tomcat-juli.jar [root@localhost bin]# netstat -antp | grep 8080 tcp6 0 0 :::8080 :::* LISTEN 81243/java 浏览器登录192.168.200.70:8080登录成功
2、优化tomcat启动速度
第一次启动查看日志会发现Tomcat启动很慢,默认情况下都需要几十秒，可以修改jdk参数进行改。
[root@localhost ~]# vi /usr/java/jdk1.8.0 201-amd64/jre/lib/security/java.security securerandom.source= file:/dev/urandom[root@localhost ~]# vi /usr/java/jdk1.8.0 201-amd64/jre/lib/security/java.security securerandom.source= file:/dev/urandom[root@localhost ~]# vi /usr/java/jdk1.8.0 201-amd64/jre/lib/security/java.security securerandom.source= file:/dev/urandom
原理：
/dev/random和/dev/urandom是Linux系统中提供的随机伪设备，这两个设备的任务,
是提供永不为空的随机字节数据流。很多解密程序与安全应用程序(如SSH Keys,SSL Keys等)需要它们提供的随机数据流。
区别:
这两个设备的差异在于: /dev/random的random pool依赖于系统中断，因此在系统的中断数不足时，
/dev/random设备会一 -直封锁， 尝试读取的进程就会进入等待状态，直到系统的中断数充分够用，
/dev/random设备可以保证数据的随机性。/dev/urandom不依赖系统的中断， 也就不会造成进程忙等待，
但是数据的随机性也不高。
[root@localhost bin]# cd /usr/java/ [root@localhost java]# ls default jdk1.8.0_201-amd64 latest [root@localhost java]# cd jdk1.8.0_201-amd64/ [root@localhost jdk1.8.0_201-amd64]# cd jre/lib/ [root@localhost lib]# ls security [root@localhost lib]# cd security/ [root@localhost security]# ls blacklist blacklisted.certs cacerts java.policy java.security javaws.policy policy trusted.libraries [root@localhost security]# vim java.security securerandom.source=file:/dev/urandom[root@localhost bin]# cd /usr/java/ [root@localhost java]# ls default jdk1.8.0_201-amd64 latest [root@localhost java]# cd jdk1.8.0_201-amd64/ [root@localhost jdk1.8.0_201-amd64]# cd jre/lib/ [root@localhost lib]# ls security [root@localhost lib]# cd security/ [root@localhost security]# ls blacklist blacklisted.certs cacerts java.policy java.security javaws.policy policy trusted.libraries [root@localhost security]# vim java.security securerandom.source=file:/dev/urandom[root@localhost bin]# cd /usr/java/ [root@localhost java]# ls default jdk1.8.0_201-amd64 latest [root@localhost java]# cd jdk1.8.0_201-amd64/ [root@localhost jdk1.8.0_201-amd64]# cd jre/lib/ [root@localhost lib]# ls security [root@localhost lib]# cd security/ [root@localhost security]# ls blacklist blacklisted.certs cacerts java.policy java.security javaws.policy policy trusted.libraries [root@localhost security]# vim java.security securerandom.source=file:/dev/urandom
3、虚拟主机配置
基于域名构建虚拟主机
[root@localhost security]# cd /usr/local/tomcat/webapps/ [root@localhost webapps]# ls docs examples host-manager manager ROOT [root@localhost webapps]# cd ROOT/ [root@localhost ROOT]# ls asf-logo-wide.svg bg-nav.png index.jsp tomcat.gif tomcat.svg bg-button.png bg-upper.png RELEASE-NOTES.txt tomcat.png WEB-INF bg-middle.png favicon.ico tomcat.css tomcat-power.gif [root@localhost ROOT]# vim index.jsp //查看首页内容 [root@localhost ROOT]# cd .. [root@localhost webapps]# ls docs examples host-manager manager ROOT [root@localhost webapps]# mkdir benet kgc [root@localhost webapps]# ls benet docs examples host-manager kgc manager ROOT [root@localhost webapps]# cd benet/ [root@localhost benet]# ls [root@localhost benet]# vim index.jsp <h1>this is benet web</h1> [root@localhost benet]# cd .. [root@localhost webapps]# cd kgc/ [root@localhost kgc]# ls [root@localhost kgc]# vim index.jsp <h1>this is kgc web</h1> [root@localhost kgc]# yum -y install bind [root@localhost kgc]# vim /etc/named.conf options { listen-on port 53 { any; }; allow-query { any; }; [root@localhost kgc]# vim /etc/named.rfc1912.zones zone "kgc.com" IN { type master; file "kgc.com.zone"; allow-update { none; }; }; zone "benet.com" IN { type master; file "benet.com.zone"; allow-update { none; }; }; [root@localhost kgc]# vim /etc/named.conf [root@localhost kgc]# vim /etc/named.rfc1912.zones [root@localhost kgc]# cd /var/named/ [root@localhost named]# cp -p named.localhost kgc.com.zone [root@localhost named]# vim kgc.com.zone www IN A 192.168.200.70 [root@localhost named]# cp -p kgc.com.zone benet.com.zone [root@localhost named]# systemctl start named [root@localhost named]# cd /usr/local/tomcat/ [root@localhost tomcat]# ls bin conf lib logs README.md RUNNING.txt webapps BUILDING.txt CONTRIBUTING.md LICENSE NOTICE RELEASE-NOTES temp work [root@localhost tomcat]# cd conf/ [root@localhost conf]# vim server.xml <Host name="www.benet.com" appBase="/usr/local/tomcat/webapps" unpackWARs="true" autoDeploy="true" xmlValidation="false" xmlNamespaceAware="false"> <Context docBase="/usr/local/tomcat/webapps/benet" path="" reloadable="true" /> </Host> <Host name="www.benet.com" appBase="/usr/local/tomcat/webapps" unpackWARs="true" autoDeploy="true" xmlValidation="false" xmlNamespaceAware="false"> <Context docBase="/usr/local/tomcat/webapps/benet" path="" reloadable="true" /> </Host> [root@localhost conf]# shutdown.sh Using CATALINA_BASE: /usr/local/tomcat Using CATALINA_HOME: /usr/local/tomcat Using CATALINA_TMPDIR: /usr/local/tomcat/temp Using JRE_HOME: /usr/java/jdk1.8.0_201-amd64 Using CLASSPATH: /usr/local/tomcat/bin/bootstrap.jar:/usr/local/tomcat/bin/tomcat-juli.jar [root@localhost conf]# startup.sh Using CATALINA_BASE: /usr/local/tomcat Using CATALINA_HOME: /usr/local/tomcat Using CATALINA_TMPDIR: /usr/local/tomcat/temp Using JRE_HOME: /usr/java/jdk1.8.0_201-amd64 Using CLASSPATH: /usr/local/tomcat/bin/bootstrap.jar:/usr/local/tomcat/bin/tomcat-juli.jar Tomcat started. C:\Users\zhangsan>nslookup www.kgc.com 服务器: UnKnown Address: 192.168.200.70 名称: www.kgc.com Address: 192.168.200.70 C:\Users\zhangsan>nslookup www.benet.com 服务器: UnKnown Address: 192.168.200.70 名称: www.benet.com Address: 192.168.200.70[root@localhost security]# cd /usr/local/tomcat/webapps/ [root@localhost webapps]# ls docs examples host-manager manager ROOT [root@localhost webapps]# cd ROOT/ [root@localhost ROOT]# ls asf-logo-wide.svg bg-nav.png index.jsp tomcat.gif tomcat.svg bg-button.png bg-upper.png RELEASE-NOTES.txt tomcat.png WEB-INF bg-middle.png favicon.ico tomcat.css tomcat-power.gif [root@localhost ROOT]# vim index.jsp //查看首页内容 [root@localhost ROOT]# cd .. [root@localhost webapps]# ls docs examples host-manager manager ROOT [root@localhost webapps]# mkdir benet kgc [root@localhost webapps]# ls benet docs examples host-manager kgc manager ROOT [root@localhost webapps]# cd benet/ [root@localhost benet]# ls [root@localhost benet]# vim index.jsp <h1>this is benet web</h1> [root@localhost benet]# cd .. [root@localhost webapps]# cd kgc/ [root@localhost kgc]# ls [root@localhost kgc]# vim index.jsp <h1>this is kgc web</h1> [root@localhost kgc]# yum -y install bind [root@localhost kgc]# vim /etc/named.conf options { listen-on port 53 { any; }; allow-query { any; }; [root@localhost kgc]# vim /etc/named.rfc1912.zones zone "kgc.com" IN { type master; file "kgc.com.zone"; allow-update { none; }; }; zone "benet.com" IN { type master; file "benet.com.zone"; allow-update { none; }; }; [root@localhost kgc]# vim /etc/named.conf [root@localhost kgc]# vim /etc/named.rfc1912.zones [root@localhost kgc]# cd /var/named/ [root@localhost named]# cp -p named.localhost kgc.com.zone [root@localhost named]# vim kgc.com.zone www IN A 192.168.200.70 [root@localhost named]# cp -p kgc.com.zone benet.com.zone [root@localhost named]# systemctl start named [root@localhost named]# cd /usr/local/tomcat/ [root@localhost tomcat]# ls bin conf lib logs README.md RUNNING.txt webapps BUILDING.txt CONTRIBUTING.md LICENSE NOTICE RELEASE-NOTES temp work [root@localhost tomcat]# cd conf/ [root@localhost conf]# vim server.xml <Host name="www.benet.com" appBase="/usr/local/tomcat/webapps" unpackWARs="true" autoDeploy="true" xmlValidation="false" xmlNamespaceAware="false"> <Context docBase="/usr/local/tomcat/webapps/benet" path="" reloadable="true" /> </Host> <Host name="www.benet.com" appBase="/usr/local/tomcat/webapps" unpackWARs="true" autoDeploy="true" xmlValidation="false" xmlNamespaceAware="false"> <Context docBase="/usr/local/tomcat/webapps/benet" path="" reloadable="true" /> </Host> [root@localhost conf]# shutdown.sh Using CATALINA_BASE: /usr/local/tomcat Using CATALINA_HOME: /usr/local/tomcat Using CATALINA_TMPDIR: /usr/local/tomcat/temp Using JRE_HOME: /usr/java/jdk1.8.0_201-amd64 Using CLASSPATH: /usr/local/tomcat/bin/bootstrap.jar:/usr/local/tomcat/bin/tomcat-juli.jar [root@localhost conf]# startup.sh Using CATALINA_BASE: /usr/local/tomcat Using CATALINA_HOME: /usr/local/tomcat Using CATALINA_TMPDIR: /usr/local/tomcat/temp Using JRE_HOME: /usr/java/jdk1.8.0_201-amd64 Using CLASSPATH: /usr/local/tomcat/bin/bootstrap.jar:/usr/local/tomcat/bin/tomcat-juli.jar Tomcat started. C:\Users\zhangsan>nslookup www.kgc.com 服务器: UnKnown Address: 192.168.200.70 名称: www.kgc.com Address: 192.168.200.70 C:\Users\zhangsan>nslookup www.benet.com 服务器: UnKnown Address: 192.168.200.70 名称: www.benet.com Address: 192.168.200.70[root@localhost security]# cd /usr/local/tomcat/webapps/ [root@localhost webapps]# ls docs examples host-manager manager ROOT [root@localhost webapps]# cd ROOT/ [root@localhost ROOT]# ls asf-logo-wide.svg bg-nav.png index.jsp tomcat.gif tomcat.svg bg-button.png bg-upper.png RELEASE-NOTES.txt tomcat.png WEB-INF bg-middle.png favicon.ico tomcat.css tomcat-power.gif [root@localhost ROOT]# vim index.jsp //查看首页内容 [root@localhost ROOT]# cd .. [root@localhost webapps]# ls docs examples host-manager manager ROOT [root@localhost webapps]# mkdir benet kgc [root@localhost webapps]# ls benet docs examples host-manager kgc manager ROOT [root@localhost webapps]# cd benet/ [root@localhost benet]# ls [root@localhost benet]# vim index.jsp <h1>this is benet web</h1> [root@localhost benet]# cd .. [root@localhost webapps]# cd kgc/ [root@localhost kgc]# ls [root@localhost kgc]# vim index.jsp <h1>this is kgc web</h1> [root@localhost kgc]# yum -y install bind [root@localhost kgc]# vim /etc/named.conf options { listen-on port 53 { any; }; allow-query { any; }; [root@localhost kgc]# vim /etc/named.rfc1912.zones zone "kgc.com" IN { type master; file "kgc.com.zone"; allow-update { none; }; }; zone "benet.com" IN { type master; file "benet.com.zone"; allow-update { none; }; }; [root@localhost kgc]# vim /etc/named.conf [root@localhost kgc]# vim /etc/named.rfc1912.zones [root@localhost kgc]# cd /var/named/ [root@localhost named]# cp -p named.localhost kgc.com.zone [root@localhost named]# vim kgc.com.zone www IN A 192.168.200.70 [root@localhost named]# cp -p kgc.com.zone benet.com.zone [root@localhost named]# systemctl start named [root@localhost named]# cd /usr/local/tomcat/ [root@localhost tomcat]# ls bin conf lib logs README.md RUNNING.txt webapps BUILDING.txt CONTRIBUTING.md LICENSE NOTICE RELEASE-NOTES temp work [root@localhost tomcat]# cd conf/ [root@localhost conf]# vim server.xml <Host name="www.benet.com" appBase="/usr/local/tomcat/webapps" unpackWARs="true" autoDeploy="true" xmlValidation="false" xmlNamespaceAware="false"> <Context docBase="/usr/local/tomcat/webapps/benet" path="" reloadable="true" /> </Host> <Host name="www.benet.com" appBase="/usr/local/tomcat/webapps" unpackWARs="true" autoDeploy="true" xmlValidation="false" xmlNamespaceAware="false"> <Context docBase="/usr/local/tomcat/webapps/benet" path="" reloadable="true" /> </Host> [root@localhost conf]# shutdown.sh Using CATALINA_BASE: /usr/local/tomcat Using CATALINA_HOME: /usr/local/tomcat Using CATALINA_TMPDIR: /usr/local/tomcat/temp Using JRE_HOME: /usr/java/jdk1.8.0_201-amd64 Using CLASSPATH: /usr/local/tomcat/bin/bootstrap.jar:/usr/local/tomcat/bin/tomcat-juli.jar [root@localhost conf]# startup.sh Using CATALINA_BASE: /usr/local/tomcat Using CATALINA_HOME: /usr/local/tomcat Using CATALINA_TMPDIR: /usr/local/tomcat/temp Using JRE_HOME: /usr/java/jdk1.8.0_201-amd64 Using CLASSPATH: /usr/local/tomcat/bin/bootstrap.jar:/usr/local/tomcat/bin/tomcat-juli.jar Tomcat started. C:\Users\zhangsan>nslookup www.kgc.com 服务器: UnKnown Address: 192.168.200.70 名称: www.kgc.com Address: 192.168.200.70 C:\Users\zhangsan>nslookup www.benet.com 服务器: UnKnown Address: 192.168.200.70 名称: www.benet.com Address: 192.168.200.70
三、Tomcat 配置文件参数优化
关于 Tomcat 主配置文件 server.xml 里面很多默认的配置项，并不能满足业务需求，常用的优化参数如下。
1、maxThreads：Tomcat 使用线程来处理接收的每个请求，这个值表示 Tomcat 可创建的 最大的线程数，默认值是 200。
2、minSpareThreads：最小空闲线程数，Tomcat 启动时的初始化线程数，表示即使没有 人使用也开这么多空线程等待，默认值是10。
3、maxSpareThreads：最大备用线程数，一旦创建的线程超过这个值，Tomcat 就会关闭 不再需要的 socket线程。默认值是-1（无限制），一般不需要指定。
4、URIEncoding：指定 Tomcat 容器的 URL 编码格式，Tomcat 语言编码格式这块不如 其它Web服务器软件配置方便，需要分别指定。
5、connnectionTimeout：网络连接超时，单位：毫秒，设置为 0 表示永不超时，这样设置 有隐患的。通常默认 20000毫秒就可以。
6、enableLookups：是否反查域名，以返回远程主机的主机名，取值为：true 或 false， 如果设置为 false，则直接返回IP 地址，为了提高处理能力，应设置为 false。
7、disableUploadTimeout：上传时是否使用超时机制。应设置为 true。
8、connectionUploadTimeout：上传超时时间，毕竟文件上传可能需要消耗更多的时间，该参数需要根据自己的业务需要自行调整，以使 Servlet 有较长的时间来完成它的执行， 需要与上一个参数一起配合使用才会生效。
9、acceptCount：指定当所有可以使用的处理请求的线程都被使用时，可传入连接请求的最大队列长度，超过这个数的请求将不予处理，默认为 100 个。
10、compression：是否对响应的数据进行 GZIP 压缩，off 表示禁止压缩、on 表示允许压 缩（文本将被压缩）、force表示所有情况下都进行压缩，默认值为 off。压缩数据后可 以有效的减少页面的大小，一般可以减小 1/3 左右，因而节省带宽。
11、compressionMinSize：表示压缩响应的最小值，只有当响应报文大小大于这个值的时候才会对报文进行压缩，如果开启了压缩功能，默认值就是 2048。
12、compressableMimeType：压缩类型，指定对哪些类型的文件进行数据压缩。noCompressionUserAgents=“gozilla, traviata”：对于以下的浏览器，不启用压缩。 如果已经对代码进行了动静分离，静态页面和图片等数据就不需要 Tomcat 处理了，那 么也就不需要在 Tomcat 中配置压缩了。因为这里只有一台 Tomcat 服务器，而且压测的是 Tomcat 首页，会有图片和静态资源文件，所以这里启用压缩。
以上是一些常用的配置参数，还有好多其它的参数设置，还可以继续深入的优化，HTTP Connector 与 AJP Connector 的参数属性值，可以参考官方文档的详细说明进行学习。
原文链接：https://blog.51cto.com/u_16099246/10085310
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