Hi Steve,
it does. but net traffic to it gets billed at the external rate on many
infrastructures
good point. so, personally, i think changing DNS there to give the
"best IP" for the hostname is a good solution. not that i have anything
against solutions which are devious and wrong. :)
i like your idea of using a local domain for disambiguation. i don't
have any re-usable scripts for this but i might borrow your idea and if
I do i'll ping you.
i wonder also about -- as standard feature in whirr -- if we create some
sort of "WhirrUniqueHostname" for each node and configure /etc/hosts on
each of the machines to know about these private hostnames. i take it
you need a hostname, and can't use the private IP in the config file?
that seems the only problem this would solve, i think, but if this is a
common requirement it's maybe worth doing.
as for other custom cloud-specific things the following might be useful
/ borrowable:
-
https://github.com/brooklyncentral/brooklyn/blob/master/core/src/main/java/brooklyn/location/basic/jclouds/JcloudsLocation.java#L1058
-
https://github.com/cloudsoft/brooklyn-cdh/blob/master/src/main/java/io/cloudsoft/cloudera/brooklynnodes/WhirrClouderaManager.groovy#L117
-
https://github.com/cloudsoft/brooklyn-cdh/blob/master/src/main/java/io/cloudsoft/cloudera/brooklynnodes/WhirrClouderaManager.groovy#L175
- http://www.cloudsoftcorp.com/blog/automating-mapr-with-brooklyn-technical/
--A
On 05/10/2012 11:56, Steve Loughran wrote:
On 4 October 2012 22:23, Alex Heneveld <[email protected]>wrote:
Steve-
He he I have scars from all the times I've banged my head against this.
I've come to the conclusion you should pretty much always use:
cluster.getInstanceMatching(**RolePredicates.role("cmserver"**
)).getPublicHostname()
which is the *public* hostname admittedly -- but should normally resolve
within a private subnet to the private IP if the public IP is not
accessible.
it does. but net traffic to it gets billed at the external rate on many
infrastructures
In a good network anyway. Failing that you should just be able to use
the private IP. If you're feeling ambitious, fix /etc/hosts / DNS for the
boxes you manage so that public hostnames do work everywhere in your
universe.
oh, that's both devious and wrong. I'll think about using it though.
Otherwise you end up hacking different things for different target clouds.
do you have those per-target hacks anywhere? a whirr-contrib module perhaps?
I think private hostname is a nebulous concept ... good that
Instance.getPrivateHostname is deprecated. (Private to whom? -- localhost
is quite a reliable private hostname but probably not what you are after!)
So can you somehow use public hostname or private IP ?
I was thinking maybe I could run something on one of the hosts I bring up
to do the mapping for me -give it the list of IPs, get back the locally
rDNS'd list. I don't see anything in whirr right now, and the way
statements get executed as async batches, it maybe tricky. I could imagine
a new statement to do that.
for now I'm just going to add an extra property for the domain, suffix that
to the (known) hostname -and let the users sort it out
