docker 运行tomcat 出现404错误！

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• 首先的版本如下:

(base) [root@qi ~]# uname -a
Linux qi 3.10.0-1127.8.2.el7.x86_64 #1 SMP Tue May 12 16:57:42 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux
(base) [root@qi ~]# cat /etc/redhat-release 
CentOS Linux release 7.8.2003 (Core)
(base) [root@qi ~]# docker --version
Docker version 18.03.1-ce, build 9ee9f40

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我目前拉取的是最新的tomcat：9.0.35；

然后使用命令 docker run -it -p 7777:8080 tomcat,最后发现网页出现404错误，上网查询一般给出的处理方式基本如下，治标不治本，所以有所改善，如有错误，请留言多多指教！

• 这是一般解决方案：

(base) [root@qi ~]# docker container ls
CONTAINER ID        IMAGE               COMMAND             CREATED              STATUS              PORTS                    NAMES
c8a751e11592        tomcat              "catalina.sh run"   About a minute ago   Up About a minute   0.0.0.0:7777->8080/tcp   wizardly_tesla
(base) [root@qi ~]# docker exec -it c8a751e11592 /bin/bash
root@c8a751e11592:/usr/local/tomcat# ls
BUILDING.txt     NOTICE         RUNNING.txt  lib             temp          work
CONTRIBUTING.md  README.md      bin          logs            webapps
LICENSE          RELEASE-NOTES  conf         native-jni-lib  webapps.dist
root@c8a751e11592:/usr/local/tomcat# cd webapps
root@c8a751e11592:/usr/local/tomcat/webapps# ls
root@c8a751e11592:/usr/local/tomcat/webapps# cd ..
root@c8a751e11592:/usr/local/tomcat# ls
BUILDING.txt     NOTICE         RUNNING.txt  lib             temp          work
CONTRIBUTING.md  README.md      bin          logs            webapps
LICENSE          RELEASE-NOTES  conf         native-jni-lib  webapps.dist
root@c8a751e11592:/usr/local/tomcat# mv webapps webapps2    
root@c8a751e11592:/usr/local/tomcat# mv webapps.dist webapps
root@c8a751e11592:/usr/local/tomcat# ls
BUILDING.txt     NOTICE         RUNNING.txt  lib             temp      work
CONTRIBUTING.md  README.md      bin          logs            webapps
LICENSE          RELEASE-NOTES  conf         native-jni-lib  webapps2
root@c8a751e11592:/usr/local/tomcat# cd webapps
root@c8a751e11592:/usr/local/tomcat/webapps# ls
ROOT  docs  examples  host-manager  manager

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• 一点点改变！

采取commit指令，来更正为自己的image，以便能一改受益于终身。
先退出此容器，Ctrl+P+Q，如果此指令不行，试一试Ctrl+D.
然后使用 docker commit -m="要描述的信息" -a="作者" 容器ID 自定义名字:标签
这样就把有一点错误的tomcat取代了，以后运行直接运行直接创建的tomcat即可！