为什么我的docker执行完我的shell脚本后退出？

这个问题已经在这里有了答案：????????????>????????????Docker container will automatically stop after “docker run -d”????????????????????????????????????11个
为什么我的docker执行完我的shell脚本后退出？谢谢.

Docker版本：

docker --version
Docker version 1.12.4,build 1564f02

我的图片：

docker pull lw96/ubuntu-16.04-lnmp1.3

运行后：

docker run -it -d --name test -p 8080:80 lw96/ubuntu-16.04-lnmp1.3 sh /root/run.sh

我检查了：docker ps -a

root@ubuntu:/home/liwei# docker ps -a
CONTAINER ID        IMAGE               COMMAND             CREATED             STATUS              PORTS                  NAMES
68c0ce4c59f7        a57b0c1a60cf        "/bin/bash"         2 minutes ago       Up 2 minutes        0.0.0.0:8080->80/tcp   test

这是run.sh：

#! /bin/bash
lnmp restart
echo "lnmp already start"
exit 0

我有日志：

root@ubuntu:/home/liwei# docker logs -f test
+-------------------------------------------+
|    Manager for LNMP,Written by Licess    |
+-------------------------------------------+
|              http://lnmp.org              |
+-------------------------------------------+
Stoping LNMP...
Stoping nginx... nginx is not running.
 * MySQL server PID file could not be found!
Gracefully shutting down php-fpm /etc/init.d/php-fpm: 82: kill: No such process

................................... failed. Use force-quit
Starting LNMP...
Starting nginx...  done
Starting MySQL
.. * 
Starting php-fpm  done
lnmp already start!

之后,我的DOCKER集装箱出口：

root@ubuntu:/home/liwei# docker ps -a
CONTAINER ID        IMAGE                       COMMAND             CREATED             STATUS                     PORTS               NAMES
cb98d7427802        lw96/ubuntu-16.04-lnmp1.3   "sh /root/run.sh"   8 minutes ago       Exited (0) 7 minutes ago                       test

但是,当我使用时：

docker pull lw96/ubuntu-16.04-lnmp1.3

docker run -it -d -p 80:80 --name test  lw96/ubuntu-16.04-lnmp1.3

docker exec -it test /bin/bash

cd ~ && ./run.sh

我的容器运作良好.为什么？？？？？