环境

操作系统版本信息：

[root@localhost conf]# cat /etc/redhat-release
CentOS Linux release 7.5.1804 (Core)

JAVA版本信息

[root@localhost conf]# java -version
openjdk version "1.8.0_372"
OpenJDK Runtime Environment (build 1.8.0_372-b07)
OpenJDK 64-Bit Server VM (build 25.372-b07, mixed mode)

Tomcat版本信息

[root@localhost sbin]# ./tomcat version
Server version: Apache Tomcat/7.0.76
Server built:   Nov 16 2020 16:51:26 UTC
Server number:  7.0.76.0
OS Name:        Linux
OS Version:     3.10.0-862.el7.x86_64
Architecture:   amd64
JVM Version:    1.8.0_372-b07
JVM Vendor:     Red Hat, Inc.

防火墙信息：

[root@localhost sbin]# firewall-cmd --list-all
public (active)
  target: default
  icmp-block-inversion: no
  interfaces: ens33
  sources:
  services: ssh dhcpv6-client
  ports: 80/tcp 443/tcp 8080/tcp
  protocols:
  masquerade: no
  forward-ports:
  source-ports:
  icmp-blocks:
  rich rules:

现象

原因

因为使用了yum一键安装tomcat，默认不自动tomcat管理器，需要手动安装管理器：

yum install tomcat-webapps tomcat-admin-webapps

解决