环境准备：

1.Linux 系统服务器： CentOS 7

2.yum 3.4.3

3.java 1.8

4.tomcat

yum环境

运行rpm -qa | grep yum

[root@localhost Downloads]# rpm -qa | grep yumyum-metadata-parser-1.1.4-10.el7.x86_64yum-langpacks-0.4.2-7.el7.noarchPackageKit-yum-1.1.5-2.el7.centos.x86_64yum-3.4.3-158.el7.centos.noarchyum-utils-1.1.31-46.el7_5.noarchyum-plugin-fastestmirror-1.1.31-46.el7_5.noarch

 

java环境

先查看是否有java环境： rpm -qa | grep java

如果没有java环境的话，接着就去查找java-1.8.0的可以使用的安装包：yum list | grep java-1.8.0-openjdk

yum list | grep java-1.8.0-openjdkjava-1.8.0-openjdk.x86_64                   1:1.8.0.191.b12-0.el7_5    @updates java-1.8.0-openjdk-headless.x86_64          1:1.8.0.191.b12-0.el7_5    @updates java-1.8.0-openjdk.i686                     1:1.8.0.191.b12-1.el7_6    updates  java-1.8.0-openjdk.x86_64                   1:1.8.0.191.b12-1.el7_6    updates  java-1.8.0-openjdk-accessibility.i686       1:1.8.0.191.b12-1.el7_6    updates  java-1.8.0-openjdk-accessibility.x86_64     1:1.8.0.191.b12-1.el7_6    updates  java-1.8.0-openjdk-accessibility-debug.i686 1:1.8.0.191.b12-1.el7_6    updates  java-1.8.0-openjdk-accessibility-debug.x86_64java-1.8.0-openjdk-debug.i686               1:1.8.0.191.b12-1.el7_6    updates  java-1.8.0-openjdk-debug.x86_64             1:1.8.0.191.b12-1.el7_6    updates  java-1.8.0-openjdk-demo.i686                1:1.8.0.191.b12-1.el7_6    updates  java-1.8.0-openjdk-demo.x86_64              1:1.8.0.191.b12-1.el7_6    updates  java-1.8.0-openjdk-demo-debug.i686          1:1.8.0.191.b12-1.el7_6    updates  java-1.8.0-openjdk-demo-debug.x86_64        1:1.8.0.191.b12-1.el7_6    updates  java-1.8.0-openjdk-devel.i686               1:1.8.0.191.b12-1.el7_6    updates  java-1.8.0-openjdk-devel.x86_64             1:1.8.0.191.b12-1.el7_6    updates  java-1.8.0-openjdk-devel-debug.i686         1:1.8.0.191.b12-1.el7_6    updates  java-1.8.0-openjdk-devel-debug.x86_64       1:1.8.0.191.b12-1.el7_6    updates  java-1.8.0-openjdk-headless.i686            1:1.8.0.191.b12-1.el7_6    updates  java-1.8.0-openjdk-headless.x86_64          1:1.8.0.191.b12-1.el7_6    updates  java-1.8.0-openjdk-headless-debug.i686      1:1.8.0.191.b12-1.el7_6    updates  java-1.8.0-openjdk-headless-debug.x86_64    1:1.8.0.191.b12-1.el7_6    updates  java-1.8.0-openjdk-javadoc.noarch           1:1.8.0.191.b12-1.el7_6    updates  java-1.8.0-openjdk-javadoc-debug.noarch     1:1.8.0.191.b12-1.el7_6    updates  java-1.8.0-openjdk-javadoc-zip.noarch       1:1.8.0.191.b12-1.el7_6    updates  java-1.8.0-openjdk-javadoc-zip-debug.noarch 1:1.8.0.191.b12-1.el7_6    updates  java-1.8.0-openjdk-src.i686                 1:1.8.0.191.b12-1.el7_6    updates  java-1.8.0-openjdk-src.x86_64               1:1.8.0.191.b12-1.el7_6    updates  java-1.8.0-openjdk-src-debug.i686           1:1.8.0.191.b12-1.el7_6    updates  java-1.8.0-openjdk-src-debug.x86_64         1:1.8.0.191.b12-1.el7_6    updates

　　

安装java-1.8.0-openjdk所有的文件

[root@localhost Downloads]# yum -y install java-1.8.0-openjdk*

输入命令查看java版本

[root@localhost Downloads]# java -versionopenjdk version "1.8.0_191"OpenJDK Runtime Environment (build 1.8.0_191-b12)OpenJDK 64-Bit Server VM (build 25.191-b12, mixed mode)安装

通过yum安装tomcat

yum install tomcat

　　

进入tomcat安装目录

cd /usr/share/tomcat

　查看tomcat状态

[root@localhost tomcat]# systemctl status tomcat● tomcat.service - Apache Tomcat Web Application Container   Loaded: loaded (/usr/lib/systemd/system/tomcat.service; disabled; vendor preset: disabled)

 启动tomcat

systemctl start tomcat

安装tomcat-webapps 和 tomcat-admin-webapps 两个插件包

yum install tomcat-webapps tomcat-admin-webapps

访问http://ip:8080即可访问Tomcat

复制出红色框框的这两行，可以直接设置username=”root” password=”root”

 

接着点开xshell,进入 tomcat 安装目录（cd /usr/share/tomcat），进入 conf 目录，打开 tomcat-users.xml 文件，在标签下，添加如下配置：

编辑文件，可以用vi或vim点开文件直接编辑

cd  /usr/share/tomcatcd confvim tomcat-users.xml

 

vim点开后，按键盘是 i 键 ，进入编辑状态，鼠标移动到最后一行  上方，直接粘贴进去就行了

编辑完成后，按ESC键，输入 :wq 回车保存退出

重启Tomcat

systemctl restart tomcat

再访问Tomcat界面，点击“Manager App”按钮，输入账号root密码root，进入Tomcat界面