Oh well... would have been nice.
Might be something to add as a feature request. I've been doing clusters for quite a few years now, and have seen the size of them increase from commonly less than a hundred hosts to 1000+ in the last few years. 1000+ is not out of the ordinary now, whereas even 3 years ago one I did that was 350 hosts would have wound up around #115 in the top 500 supercomputer list (or so the IBM tech who came by to see it told me). When the cluster sizes grow like this, the config files can get kind of unwieldy without some sort of template syntax.
It's too bad there's also not a feature to pull the addr's from the dns or some other resolution mechanism, and an expression syntax to define a range of hosts, eg, if you had hosts node0001-node1500, you could express it in one line as:
node[0001-1500] # conn NOPROPRED:+cpu
where the "+" (or some other token) would tell hobbit to do an address lookup instead of pulling it from the bb-hosts file.
Barring that, the cluster mgmt s/w I use does use a similar type of syntax for host range definition, and I can always use the cmd-line tools from that to list the host info for the cluster, then pipe that through awk/sed and build the client include files on the fly, but it harks back to the days of perl one-liners. Not that that's necessarily a bad thing...
johnB
2008/6/10 John Burk <john.d.burk at gmail.com>:
Sweet. This is exactly what I was looking for.
I'll experiment tomorrow and see if the var (guess I'll have to start calling it a macro) can be defined in the body of bb-hosts and still be evaluated correctly in the include files that contain the client entries. I'm guessing it will since the section of the hobbit-alerts manpage that deals with macros mentions that macros can be nested, but that the inner macro must be defined first. This leads me to believe that the config file parser reads line-by-line evaluating as it goes.
I'm just going to get started in the next day or two with alerts within hobbit, hence my unfamiliarity with macros. I had quickly scanned the hobbit-alerts manpage today but had missed the significance of the section on macros, mainly because it looked at first glance to be regex evaluation; the example with "$WEBHOSTS=%(www|intranet|support|mail).foo.com" caught my eye. Does the leading '%' always signify some sort of regular expression in hobbit?
johnB
2008/6/10 Tim McCloskey <devzero at cox.net>:
So I was curious about the whole macro thing and decided to test it out. It has only been a few minutes but the following seems to work fine. I hope this helps in some way.
bb-hosts:
$foo="dns" ipaddress servername # $foo
Regards,
Tim
Tim McCloskey wrote:
As mentioned, perhaps someone with knowledge on the topic can answer.
To extend the question further, since macros (variables) are able to be used within the hobbit-alerts.cfg file I wonder if variables can be assigned in bb-hosts and hobbit-clients.cfg? At one point I thought of trying to keep all of our host/client/alerts data within mysql, but it was only a thought.
Regards, Tim
John Burk wrote: I'm using includes in my bb-hosts to keep the file
length down, but my included files are comprised of hundreds of hosts all identical except for the ipaddresses and hostnames.
Surely there must be a way to template this, I just can't find it in the bb-hosts manpage...
...
and so on in mind-numbing repetition...
I'd like to be able to define the tags in a template, and simply use that template. Does this mechanism exist in bb-host? That way if/when I need to change the tags for all my hosts, I only need to do it in one place, and not on every line in 3 different files.
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