After typing the command:

I get the output:

I have made some checks, and the /bin/bash file exists normaly as well as the /opt/insight directory. Don't know why I am doing this, I only go by the book (some manual).

Thanks!

Does /opt/insight/bin/bash exist? AFAIK, chroot looks for the file to execute within the chroot'ed environment.

Hi, thanks for the reply.

Yes, the /opt/insight/bin/bash exists. I have also tried:


But I got the same msg. Should I check sth else?

Maybe /opt/insight/bin/bash is dynamically linked against something outside the chroot. I think that would give the same error message. Try linking bash statically. You could also install a dynamic linker and shared objects in the chrooted environment but thats much harder and more time consuming. If you're planning to run lots of stuff from inside the chroot, though, it could save you lots of memory.

btw, "chroot /opt/insight" is the same as "chroot /opt/insight /bin/sh"

Thanks for the reply. As time passes by, I make a deeper research about the "chroot" thing... What is all this about, after all? From my pov it is a way to say that temporarily the root directory is going to be the "/opt/insight" right? So what is the meaning of this. Theoretically, I can chdir to /opt/insight and do whatever I need to do.

Is this right or am I just typing...?

Thats pretty much correct. But there is another important point. Once you're inside the chroot'ed environment, you can't see anything outside it. This means you can only run programs that are self-contained withing the /opt/insight directory. Most programs link dynamically against libraries in /lib and /usr/lib. If you want to run any programs from inside the chroot, they must not link against any libraries outside the chroot. You can achieve this either by linking them all statically or by installing a dynamic linker inside /opt/insight and linking the binaries with that linker.