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read only root partition


I want to install debian on a computer, where only the /var partition would 
be writeable. Has anyone of you done it? Any advice?

The possible problems:

Some programs want to have write access to /etc to work properly. Putting a 
link to /var/etc/file from /etc/file should work. 

/dev needs write access (how do I do that exactly? mount /dev from another 

A concrete example: /etc/nologin is written during boot time and erased after 
that. If I put a link to /var/etC/nologin from /etc/nologin, it won't work as 
/etc/nologin wont be erasable :-( And I didn't find a way to specify another 
file to login/nologin....

Thanks for you help!

             |  -°)                        (°-  |
             |  /\\     Linux for ever     //\  |
             | _\_v                        v_/_ |

   If windows is the answer, it must have been a stupid question.

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