Partners who have installed java should know that environment variables need to be set after installation. The advantage of the previous installation through yum is that environment variables have been set automatically for us.

Is there not much difference between openjdk and jdk? Why did I bother to uninstall it before? Embarrassment

tomcat Installation -- yum Installation

tomcat installation can download the installation package first, then decompress it. You can also install it online directly with yum. It's more convenient for us to install it online directly with yum.

yum install tomcat
//perhaps
yum -y install tomcat

- Representatives of Y choose y when they are asked, so they don't need to input y manually during installation.
After the installation is completed, the installation directory is in "/usr/share/tomcat". We use the cd command to cut to the directory and use the ls (or ll) command to view the files in the directory.

[root@yoyo tomcat]# ls
bin  conf  lib  logs  temp  webapps  work
[root@yoyo tomcat]# ll
total 4
drwxr-xr-x 2 root root   4096 Dec 28 10:41 bin
lrwxrwxrwx 1 root tomcat   11 Dec 28 10:41 conf -> /etc/tomcat
lrwxrwxrwx 1 root tomcat   22 Dec 28 10:41 lib -> /usr/share/java/tomcat
lrwxrwxrwx 1 root tomcat   15 Dec 28 10:41 logs -> /var/log/tomcat
lrwxrwxrwx 1 root tomcat   22 Dec 28 10:41 temp -> /var/cache/tomcat/temp
lrwxrwxrwx 1 root tomcat   23 Dec 28 10:41 webapps -> /var/lib/tomcat/webapps
lrwxrwxrwx 1 root tomcat   22 Dec 28 10:41 work -> /var/cache/tomcat/work

Start the tomcat service

View the status of tomcat: system CTL status Tomcat

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

Active: inactive (dead) means tomcat is dead (hanging) and the service is not running yet.

Start tomcat: system CTL start Tomcat (or system CTL start tomcat. service)

[root@yoyo tomcat]# systemctl start tomcat
[root@yoyo tomcat]# systemctl status tomcat
● tomcat.service - Apache Tomcat Web Application Container
   Loaded: loaded (/usr/lib/systemd/system/tomcat.service; disabled; vendor preset: disabled)
   Active: active (running) since Fri 2018-12-28 10:48:38 CST; 5s ago
 Main PID: 5216 (java)
   CGroup: /system.slice/tomcat.service
           └─5216 /usr/lib/jvm/jre/bin/java -classpath /usr/share/tomcat/bin/bootstrap.jar:/usr/share/tomcat/bin...

Dec 28 10:48:38 yoyo server[5216]: Dec 28, 2018 10:48:38 AM org.apache.catalina.core.StandardService startInternal
Dec 28 10:48:38 yoyo server[5216]: INFO: Starting service Catalina
Dec 28 10:48:38 yoyo server[5216]: Dec 28, 2018 10:48:38 AM org.apache.catalina.core.StandardEngine startInternal
Dec 28 10:48:38 yoyo server[5216]: INFO: Starting Servlet Engine: Apache Tomcat/7.0.76
Dec 28 10:48:38 yoyo server[5216]: Dec 28, 2018 10:48:38 AM org.apache.coyote.AbstractProtocol start
Dec 28 10:48:38 yoyo server[5216]: INFO: Starting ProtocolHandler ["http-bio-8080"]
Dec 28 10:48:38 yoyo server[5216]: Dec 28, 2018 10:48:38 AM org.apache.coyote.AbstractProtocol start
Dec 28 10:48:38 yoyo server[5216]: INFO: Starting ProtocolHandler ["ajp-bio-8009"]
Dec 28 10:48:38 yoyo server[5216]: Dec 28, 2018 10:48:38 AM org.apache.catalina.startup.Catalina start
Dec 28 10:48:38 yoyo server[5216]: INFO: Server startup in 61 ms
Hint: Some lines were ellipsized, use -l to show in full.

You can see that the state is Active: active (running), which means tomcat is running normally.
You can also see Main PID: 5216 (java) to know that the PID is 5216

Visit tomcat

tomcat default port is 8080, then browse the input address: http://server public network ip:8080/. This page is temporarily inaccessible
Since tomcat's web pages require plug-ins to be installed, two plug-in packages, tomcat-webapps and tomcat-admin-webapps, continue to be used here.

yum install tomcat-webapps tomcat-admin-webapps

Port, privilege, firewall issues - Solve them by yourself

Go to the browser and visit http://server public network ip:8080, then you can open tomcat's address.

Doubt

So far, everything is normal, but I installed version 7.0.76! Perhaps only this version of yum is installed!

Manager App username and password

If you want to enter Manager App, there will be a pop-up box at the Home Point for Manager App to enter the username and password.

If the direct point is cancelled, 401 interface will appear.

Copy the two lines of the red box and set username="root" password="root" directly.

<role rolename="manager-gui"/>
<user username="tomcat" password="s3cret" roles="manager-gui"/>

Then click on the xshell, enter the Tomcat installation directory (cd/usr/share/tomcat), enter the conf directory, open the tomcat-users.xml file, add the following configuration under the label:

<role rolename="manager-gui"/>
<user username="root" password="root" roles="manager-gui"/>

Edit files, you can use vi or vim point open files directly edit

cd  /usr/share/tomcat
cd conf
vim tomcat-users.xml 

When vim is turned on, the keypad is the i key and enters the editing state. Mouse moves over the last line and pastes directly into it.

After editing, press ESC key, enter: wq Enter, save and exit

tomcat related commands

Stop tomcat Service - system CTL stop tomcat

Restart Tomcat - ----- system CTL restart Tomcat

Start-up - ------- system CTL enable Tomcat

View the status of tomcat - - - system CTL status tomcat

Start Tomcat - - - system CTL status Tomcat

Posted by Anti-Moronic on Mon, 05 Aug 2019 21:48:07 -0700