Description of problem:
Documentation (man page) state (emphasis mine):
dnf [options] module install <module_spec>...
Dnf will make sure that RPMs from specified module profile or, in **case no profile was provided, default module profile** are
installed. Dnf will also make sure module stream is enabled after.
But when I try:
# dnf module install container-tools:2017.0
No profile specified for 'container-tools:2017.0', please specify profile
And BTW you are missing dot at the end of that line of the error.
*** This bug has been marked as a duplicate of bug 1565543 ***