Re: Host groups

[Ole Tange]

On Sat, Aug 30, 2014 at 12:22 PM, Ole Tange <tange@gnu.org> wrote:
> I have had people ask for hostgroups, so you could do:
>
>     parallel --nonall -S @webservers uptime
>
> or similar.

This is now implemented. It works this way:

The sshlogins can now be prepended with hostgroups:

  @group/sshlogin
  @group+group/sshlogin

Example:

  @web/www1
  @web/webuser@www2
  @web+db/www3
  @db/db1.example.com

If one of the entries _only_ has a group (i.e. no sshlogin), then this
hosts from this group will used. A host can be in multiple groups.

It can be given on the command line:

  parallel --nonall -S @web -S @web/www1 -S @db/db1.example.com hostname

but it is more likely that you will have a list of hostsgroups
(similar to the list above) in ~/.parallel/sshloginfile and then you
can do:

  parallel --nonall -S @web -S .. hostname

It would be great if you would read through the manual and see if the
explanation is good enough.


/Ole