[CentOS] tftp-server, unable to create new files (even with "-c"option)

Ross S. W. Walker rwalker at medallion.com
Thu Sep 13 19:33:06 UTC 2007

Les Mikesell wrote:
> Ross S. W. Walker wrote:
> >>> Just to make sure, is the /tftpboot directory set to perms 777?
> >> Not that that parent directory (/tftpboot) requires (or should 
> >> ever have) anything like that to work
> >>
> >>   -- why the voodoo suggestion?
> > 
> > Because if you are allowing any old anonymous user to write to
> > that directory then why would one care if you only allowed group
> > 'nobody' to write there?
> > 
> > You could set it to 755 and create a 'cisco' dir underneath with
> > 777, but I would leave that for when it's working.
> > 
> > Chances are though everything under /tftpboot is subject to
> > modification and /tftpboot will need to be a separate volume to
> > protect against DoS through filling up the disk drive.
> The usual approach is to create the filename yourself (ssh in 
> and "touch 
> devicename-confg") and chmod it to 666 before doing the tftp. 
>  That way 
> you don't have to let tftp create any files and its lack of 
> authentication is less of an issue).  If you are committing 
> the configs 
> to cvs (a good idea, since you can easily track changes), 
> note that cvs 
> for some reason will change the modes as a side effect of the 
> commit and 
> you'll have to put them back to 666 before the next tftp in.

Yes, those are good controls on tftp and sound like best practices.

For initial population of /tftpboot though one may want to use -c
and then once it is populated remove the -c switch, check it all
into cvs/subversion and make sure the permissions are sane.


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