并修改端口避免与GitLab冲突

vim /lib/systemd/system/tomcat.service

```bash

[Unit]
Description=tomcat
After=network.target　　　　　　　　　
[Service]
Type=forking

Environment="JAVA_HOME=/opt/jdk-11.0.17"

ExecStart=/opt/apache-tomcat-9.0.68/bin/startup.sh
ExecStop=/opt/apache-tomcat-9.0.68/bin/shutdown.sh
ExecReload=/bin/kill -s HUP $MAINPID
PrivateTmp=true

[Install]
WantedBy=multi-user.target

文件 :/opt/apache-tomcat-9.0.68/conf/server.xml

<?xml version="1.0" encoding="UTF-8"?>

<Server port="10003" shutdown="SHUTDOWN">
    <Listener className="org.apache.catalina.startup.VersionLoggerListener" />

    <Listener className="org.apache.catalina.core.AprLifecycleListener" SSLEngine="on" />

    <Listener className="org.apache.catalina.core.JreMemoryLeakPreventionListener" />
    <Listener className="org.apache.catalina.mbeans.GlobalResourcesLifecycleListener" />
    <Listener className="org.apache.catalina.core.ThreadLocalLeakPreventionListener" />


    <GlobalNamingResources>

        <Resource name="UserDatabase" auth="Container"
                  type="org.apache.catalina.UserDatabase"
                  description="User database that can be updated and saved"
                  factory="org.apache.catalina.users.MemoryUserDatabaseFactory"
                  pathname="conf/tomcat-users.xml" />
    </GlobalNamingResources>


    <Service name="Catalina">


        <Connector port="10004" protocol="HTTP/1.1"
                   connectionTimeout="20000"
                   redirectPort="8443" />

        <Engine name="Catalina" defaultHost="localhost">


            <Realm className="org.apache.catalina.realm.LockOutRealm">

                <Realm className="org.apache.catalina.realm.UserDatabaseRealm"
                       resourceName="UserDatabase"/>
            </Realm>

            <Host name="localhost"  appBase="webapps"
                  unpackWARs="true" autoDeploy="true">

                <Valve className="org.apache.catalina.valves.AccessLogValve" directory="logs"
                       prefix="localhost_access_log" suffix=".txt"
                       pattern="%h %l %u %t &quot;%r&quot; %s %b" />

            </Host>
        </Engine>
    </Service>
</Server>