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©Copyright Sweet Potato Yao 2022-01-06

1. Download tomcat9 and upload it to the server

download link:

官网下载地址：
https://tomcat.apache.org/download-90.cgi


官网tomcat9直接下载地址：
https://dlcdn.apache.org/tomcat/tomcat-9/v9.0.56/bin/apache-tomcat-9.0.56.tar.gz

Upload the compressed package of tomcat (apache-tomcat-9.0.56.tar.gz) to the service folder, such as: /java

Second, tomcat9 installation configuration, boot up

1. Unzip the file

cd /java

tar -zxvf apache-tomcat-9.0.56.tar.gz

2. Rename the folder

The revision is shorter, and the update is easy to remember.

mv apache-tomcat-9.0.56 tomcat9

3. Modify the server.xml file and modify the tomcat port

cd /java/tomcat9/conf/

vi /java/tomcat9/conf/server.xml

Change the port from the default 8080 port to 9000: port="9000"

    <Connector port="9000" protocol="HTTP/1.1"
               connectionTimeout="20000"
               redirectPort="8443" />

4. Modify the context.xml file of tomcat to increase the cache size

Do not modify this configuration, because the cache is too small, the file cannot be loaded normally, and an error may be reported at startup

cd /java/tomcat9/conf

vi context.xml

The additions are as follows:

<Resources cacheMaxSize="512000" cachingAllowed="true"/>

details as follows:

<Context>

    <!-- Default set of monitored resources. If one of these changes, the    -->
    <!-- web application will be reloaded.                                   -->
    <WatchedResource>WEB-INF/web.xml</WatchedResource>
    <WatchedResource>WEB-INF/tomcat-web.xml</WatchedResource>
    <WatchedResource>${catalina.base}/conf/web.xml</WatchedResource>

    <Resources cacheMaxSize="512000" cachingAllowed="true"/>

    <!-- Uncomment this to disable session persistence across Tomcat restarts -->
    <!--
    <Manager pathname="" />
    -->
</Context>

5. Centos open tomcat port

Open ports, such as: 9000:

sudo firewall-cmd --zone=public --add-port=9000/tcp --permanent

A common user is used, and sudo is added in front. If it is a root user, it is not required

Make the port valid:

sudo firewall-cmd --reload

View all open ports on the firewall

sudo firewall-cmd --zone=public --list-ports

6. Centos configures Tomcat's environment variables

Edit /etc/profile to use Tomcat commands anywhere

sudo vi /etc/profile

Add Tomcat variable configuration

CATALINA_HOME=/java/tomcat9
CATALINA_BASE=/java/tomcat9
PATH=$PATH:$CATALINA_BASE/bin
export  CATALINA_HOME CATALINA_BASE PATH

Recompile to make the configuration take effect

source /etc/profile

7. Modify the jvm running by tomcat

setenv.sh is not available by default, just add it directly

vi /java/tomcat9/bin/setenv.sh

Added content:

#add tomcat pid
CATALINA_PID="$CATALINA_BASE/tomcat-9000.pid"

#add java opts
JAVA_OPTS="-server -XX:PermSize=1024m -XX:MaxPermSize=1024m -Xms512m -Xmx512m -XX:MaxNewSize=256m"

Add permissions to ensure the file setenv.sh is executable

chmod +x /java/tomcat9/bin/setenv.sh

8. Modify tomcat's setclasspath.sh and configure the Java path

Add the following configuration to the header of setclasspath.sh, otherwise an error will be reported (Neither the JAVA_HOME nor the JRE_HOME environment variable is defined):

vi /java/tomcat9/bin/setclasspath.sh

Add below the sentence Set JAVA_HOME or JRE_HOME, the added content:

# -----------------------------------------------------------------------------
#  Set JAVA_HOME or JRE_HOME if not already set, ensure any provided settings
#  are valid and consistent with the selected start-up options and set up the
#  endorsed directory.
# -----------------------------------------------------------------------------
export JAVA_HOME=/java/jdk1.8
export JRE_HOME=/java/jdk1.8/jre

Third, tomcat starts and runs

1. Start tomcat

cd /java/tomcat9/bin

./startup.sh

2. Close the Tomcat service

./shutdown.sh

3, tomcat starts, tomcat starts automatically

Add tomat service startup file: tomcat.9000.service

cd /usr/lib/systemd/system

sudo vi /usr/lib/systemd/system/tomcat.9000.service

tomcat.9000.service file content:

[Unit]
Description=Tomcat-9000
After=syslog.target network.target remote-fs.target nss-lookup.target
  
[Service]
Type=oneshot
ExecStart=/java/tomcat9/bin/startup.sh
ExecStop=/java/tomcat9/bin/shutdown.sh
ExecReload=/bin/kill -s HUP $MAINPID
ExecStop=/bin/kill -s QUIT $MAINPID
RemainAfterExit=yes
 
[Install]
WantedBy=multi-user.target

The root user starts the tomcat startup service:

systemctl enable tomcat.9000.service

The root user starts the Tomcat service:

systemctl start tomcat.9000.service

The root user checks the service status:

systemctl status tomcat.9000.service

Other commands:

root用户关闭tomcat开机自启：
systemctl disable tomcat.9000.service


root用户停止服务：
systemctl stop tomcat.9000.service


root用户重启服务：
systemctl restart tomcat.9000.service

4. Restart the Centos server

Restart the Centos server and verify that tomcat is started

reboot -f

Fourth, some commands of the firewall

查看防火墙状态：
firewall-cmd --state

关闭防火墙
systemctl stop firewalld.service

禁止防火墙开机启动
systemctl disable firewalld.service

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