estani's questions

So I've added a file using ADD in the docker file

...
ADD flvcheck /usr/local/bin/flvcheck

It build right and the file is there:

$ docker run --rm=true -ti image ls -l /usr/local/bin/flvcheck
-rwxrwxr-x 1 root root 1659908 May 20 07:56 /usr/local/bin/flvcheck

But When I try to run it I get:

$ docker run --rm=true -ti image /usr/local/bin/flvcheck
2014/05/20 08:43:25 no such file or directory

I did even install strace and use -D=true, but the problem is just that the file is being not found:

execve("/usr/local/bin/flvcheck", ["flvcheck"], [/* 8 vars */]) = -1 ENOENT (No such file or directory)

What is happening here? I can't find the issue (The file works ok in the host system and I can see it's contents within the docker

I had an issue with a container, even though it builds perfectly it does not properly start. The cause is a workaround I've added to the Dockerfile (for having a self-configured /etc/hosts routing)

RUN mkdir -p -- /lib-override /etc-override && cp /lib/libnss_files.so.2 /lib-override
ADD hosts.template /etc-override/hosts
RUN perl -pi -e 's:/etc/hosts:/etc-override/hosts:g' /lib-override/libnss_files.so.2
ENV LD_LIBRARY_PATH /lib-override

Obviously there's some error in there, but I wonder how can I get more info on what docker is doing while running. for example, this works:

$ docker run image ls
usr bin ...

But this doesn't:

$ docker run image ls -l
$

There is nothing in the logs and I can't call an interactive shell either. I can use strace to see what's happening but I was hoping theres a better way.

Is there any way I can set docker to be more verbose?

EDIT: Thanks to Andrew D. I now know what's wrong with the code above (I left it so his answer can be understood). Now the issue is still how might I debug something like this or get some insides at why ls -l failed why ls did not.

EDIT: The -D=true might give more output, though not in my case...