node.js - docker下安装nodejs提交后再运行却为何找不到了

• 运行一个容器，安装nodejs

root@d5f6a138a4da:/opt/nodejs# wget -qO- https://raw.github.com/creationix/nvm/master/install.sh | sh
=> Downloading nvm as script to '/root/.nvm'

=> Appending source string to /root/.profile
=> Close and reopen your terminal to start using nvm
root@d5f6a138a4da:/opt/nodejs# source /root/.profile
root@d5f6a138a4da:/opt/nodejs# nvm install 0.10
--2015-10-18 16:09:53--  https://nodejs.org/dist/v0.10.40/node-v0.10.40-linux-x64.tar.gz
Resolving nodejs.org (nodejs.org)... 104.20.22.46, 104.20.23.46, 2400:cb00:2048:1::6814:162e, ...
Connecting to nodejs.org (nodejs.org)|104.20.22.46|:443... connected.
HTTP request sent, awaiting response... 200 OK
Length: 6128131 (5.8M) [application/gzip]
Saving to: '/root/.nvm/bin/node-v0.10.40-linux-x64/node-v0.10.40-linux-x64.tar.gz'
100%[++++++++++++++++++++++++++======================================================================================>] 6,128,131   22.1KB/s   in 2m 45s 

2015-10-18 16:16:03 (27.9 KB/s) - '/root/.nvm/bin/node-v0.10.40-linux-x64/node-v0.10.40-linux-x64.tar.gz' saved [6128131/6128131]

Now using node v0.10.40 (npm v1.4.28)

• 提交

$ docker commit -m "add nodejs" -a "sunzy" d5f6a138a4da sunzy/hexo:v1.0
a4ce5fe396375ed99523c7bafbba1a9edc685068620db42eaafea4ed0c818680

• 基于提交的镜像运行

$ docker run -it --name hexo-test -v /opt/nodejs/ -p 5000:5000 sunzy/hexo /bin/bash
root@73ae2263e4a3:/opt/nodejs# npm install -g hexo-cli
bash: npm: command not found

root@73ae2263e4a3:/# cd ~
root@73ae2263e4a3:~# pwd
/root
root@73ae2263e4a3:~# ls -a
.  ..  .bash_history  .bashrc  .profile

在HOME目录下没有了nvm的目录并且无法运行npm命令……

这是为啥？docker不至于会在提交后把HOME目录初始化吧？