1.查看登录失败提示
2.设置权限
[root@tomcat apache-tomcat-9.0.11]# vim webapps/manager/META-INF/context.xml
19 <Valve className="org.apache.catalina.valves.RemoteAddrValve"
20 # allow="127\.\d+\.\d+\.\d+|::1|0:0:0:0:0:0:0:1" />####修改前
21 allow="127\.\d+\.\d+\.\d+|::1|0:0:0:0:0:0:0:1|\d+\.\d+\.\d+\.\d+" />###修改后
3.配置用户
[root@tomcat apache-tomcat-9.0.11]# vim conf/tomcat-users.xml
44 <role rolename="manager-gui"/>
45 <user username="tomcat" password="000000" roles="manager-gui"/>
4.重启tomcat
[root@tomcat apache-tomcat-9.0.11]# catalina.sh stop && sleep 5 && catalina.sh start