tomcat+jdk安装

一、下载jdk

https://www.oracle.com/technetwork/java/javase/downloads/jdk8-downloads-2133151.html

下载tomcat

http://tomcat.apache.org/download-80.cgi

 2、安装jdk

yum install glibc.i686
mkdir -p /usr/java
tar xf jdk-8u201-linux-x64.tar.gz  -C /usr/java

3、配置环境变量

vim  /etc/profile

export JAVA_HOME=/usr/java/jdk1.8.0_201
export JAVA_PATH=$JAVA_HOME
export PATH=$PATH:$JAVA_HOME/bin
export CLASSPATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar

生效

source /etc/profile

4、验证

[root@tomcat ~]# java -version
java version "jdk1.8.0_201"
Java(TM) SE Runtime Environment (build 1.8.0_191-b12)
Java HotSpot(TM) Client VM (build 25.191-b12, mixed mode)

5、安装tomcat

tar xf apache-tomcat-8.5.35.tar.gz -C /usr/local/
cd  /usr/local/
mv  apache-tomcat-8.5.35 tomcat

6、设置开启自启动

（1）方法一

cp -p /usr/local/tomcat/bin/catalina.sh /etc/init.d/tomcat

vim /etc/init.d/tomcat 
第二行添加
# chkconfig: 112 63 37
# description: tomcat server init script
# Source Function Library
. /etc/init.d/functions
JAVA_HOME=/usr/local/jdk1.8.0_191/
CATALINA_HOME=/usr/local/tomcat/

修改setclasspath.sh这个文件（不然会报错）
vim /usr/local/tomcat/bin/setclasspath.sh   (添加两行)

   export JAVA_HOME=/usr/java/jdk1.8.0_191
   export JAVA_HOME=/usr/java/jdk1.8.0_191/jre

   

  添加完了以后

  chmod 755 /etc/init.d/tomcat

  chkconfig --add tomcat

  chkconfig tomcat on

 （2）方法二

添加文件
vim  /lib/systemd/system/tomcat.service
[Unit]
Description=Tomcat
After=syslog.target network.target remote-fs.target nss-lookup.target
[Service]
Type=oneshot
ExecStart=/usr/local/tomcat/bin/startup.sh
ExecStop=/usr/local/tomcat/bin/shutdown.sh
ExecReload=/bin/kill -s HUP $MAINPID
RemainAfterExit=yes
[Install]
WantedBy=multi-user.target

修改文件

vim /usr/local/tomcat/bin/setclasspath.sh   (添加两行)

   export JAVA_HOME=/usr/java/jdk1.8.0_191
   export JAVA_HOME=/usr/java/jdk1.8.0_191/jre

设置开机自启
systemctl enable tomcat.service

6、启动tomcat

/etc/init.d/tomcat  start   或者 systemctl start tomcat.service

访问   ip+8080端口访问

 7、tomcat启动慢（解决办法）

yum install rng-tools # 安装rngd服务（熵服务，增大熵池）
systemctl start rngd # 启动服务