A user read-only access account.
Note: As the filesystem is read only, some commands won't work, such as vi that requires write access into /var/tmp to create a temporary file.
To setup read-only access a "new root" directory such are "/var/read-only" is created,.Under this directory "/" is mounted as read-only.
Here is a diagram of the directory structure.
/
| | | |
var usr adm <etc>
|
read-only
|
/ (Note: this link is a read-only mount