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Posted to dev@deltacloud.apache.org by Tom Wlodek <to...@bnl.gov> on 2011/11/01 19:22:59 UTC
GETTING STARTED WITH DELTACLOUD
Hello everybody,
I am new to deltacloud. I would like to install it at my site, so I went
to the page
http://incubator.apache.org/deltacloud/documentation.html
and I did step by step the instructions. First the prerequisites:
|yum install ruby
yum install ruby-devel
||yum install rubygems||
yum install gcc-c++
||yum install libxml libxml2-devel
||yum install libxslt libxslt-devel
||gem install rake
End of prerequisites. so far so good. But when I do
gem install deltacloud-core
ERROR: Error installing deltacloud-core:
fog requires net-ssh (~> 2.1.4, runtime)
but when I do
gem list
I get
...
net-ssh (2.2.1)
so I have net-ssh installed.
Any ideas?
Tom W
|
Re: GETTING STARTED WITH DELTACLOUD
Posted by David Lutterkort <lu...@redhat.com>.
On Tue, 2011-11-01 at 14:58 -0400, Tom Wlodek wrote:
> On 11/01/2011 02:47 PM, Francesco Vollero wrote:
> > yum install deltacloud-core
> Thanks for the response. I will try it. Could you tell me the details of
> the repository so that I could add it to yum? BTW I am in fedora.
deltacloud-core is in the standard Fedora repo, so available to any
Fedora system.
David
Re: GETTING STARTED WITH DELTACLOUD
Posted by Tom Wlodek <to...@bnl.gov>.
On 11/01/2011 02:47 PM, Francesco Vollero wrote:
> yum install deltacloud-core
Thanks for the response. I will try it. Could you tell me the details of
the repository so that I could add it to yum? BTW I am in fedora.
Tom Wlodek
Re: GETTING STARTED WITH DELTACLOUD
Posted by Francesco Vollero <ra...@gmail.com>.
Hi Tom,
Why since you're in fedora (maybe it's centos, but i think you will
find there as well) you don't just run: yum install deltacloud-core ?
Seems to be the most straightforward way to solve your problem.
In the meanwhile I gonna dig to discover what's wrong there.
Cheers,
Francesco Vollero
On Tue, Nov 1, 2011 at 7:22 PM, Tom Wlodek <to...@bnl.gov> wrote:
> Hello everybody,
>
> I am new to deltacloud. I would like to install it at my site, so I went to
> the page
>
> http://incubator.apache.org/deltacloud/documentation.html
>
> and I did step by step the instructions. First the prerequisites:
>
> |yum install ruby
> yum install ruby-devel
> ||yum install rubygems||
> yum install gcc-c++
> ||yum install libxml libxml2-devel
>
> ||yum install libxslt libxslt-devel
> ||gem install rake
>
> End of prerequisites. so far so good. But when I do
>
> gem install deltacloud-core
> ERROR: Error installing deltacloud-core:
> fog requires net-ssh (~> 2.1.4, runtime)
>
> but when I do
>
> gem list
>
> I get
> ...
>
> net-ssh (2.2.1)
>
> so I have net-ssh installed.
>
> Any ideas?
>
> Tom W
>
> |
>
>
Re: GETTING STARTED WITH DELTACLOUD
Posted by "marios@redhat.com" <ma...@redhat.com>.
Hi Tom,
OK, we've gotten to the bottom of this. First of all, thanks for taking
the time to report the issue - it will definitely help us to make the
deltacloud installation process better. There are a number of ways in
which this issue can be addressed and we are evaluating those before
making a decision. The fix should make it's way into the next Deltacloud
release. I'll likely also be updating the website with a temporary
work-around for rhel 6.1 soon. A more detailed description of the issue
follows below,
marios
================description of the problem:=========================
The issue is obviously a versioning problem... the deltacloud-core gem
itself requires the 'net-ssh' gem (we use that for the 'run-on-instance'
feature where clients can run an action on a running instance
http://incubator.apache.org/deltacloud/api#h3_5_3). Our .gemspec
requirement for net-ssh is:
s.add_dependency('net-ssh', '>= 2.0.0')
Meaning, any version of net-ssh newer than version 2 (currently the
latest version @rubygems is 2.2.1 http://rubygems.org/gems/net-ssh).
Deltacloud also requires the 'fog' gem, which we use to talk to the
terremark vCloud Express and google-storage cloud API. When you install
a gem, like fog, you also pull in all the gems that it requires. In this
case, fog has the requirement
(https://github.com/fog/fog/blob/master/fog.gemspec):
s.add_dependency('net-ssh', '~>2.1.4')
which means, any version greater than or equal to, 'in the last digit'
... i.e. '~>' here will match 2.1.4 ... up to 2.1.x but not 2.2.x
(http://docs.rubygems.org/read/chapter/16). Thus, we have a versioning
conflict... our own gemspec dependency will pull in "net-ssh >= 2.0.0",
basically meaning 'the latest'... 2.2.1. However this doesn't satisfy
the fog dependency of "2.1.4 <= net-ssh < 2.2.0".
Versions of 'rubygems' after 1.6.0
(https://github.com/rubygems/rubygems/blob/master/History.txt)
introduced a conflict resolution mechanism, whereby the 'least common
denominator' is used in such cases. In this case version 2.1.4 of
net-ssh is used, thus satisfying both .gemspec constraints. However rhel
is using rubygems version 1.3.7 (i.e. before the conflict resolution
mechanism was introduced), which is why the gem installer reports:
gem install deltacloud-core
ERROR: Error installing deltacloud-core:
fog requires net-ssh (~> 2.1.4, runtime)
Thanks again to Tom Wlodek for reporting this
On 04/11/11 19:42, Tom Wlodek wrote:
> On 11/04/2011 01:14 PM, marios@redhat.com wrote:
>> Hi Tom,
>>
>> I just spent some time looking at this:
>>
>> I tried to recreate this but was not able to (though I can see what the
>> problem is with the net-ssh version.. more below). Can you tell us what
>> OS/version you are using (I tried to recreate with a vanilla fedora 15
>> intallation).
>
> Hi, thanks for looking into that. As for the OS version:
>
>
> cat /etc/redhat-release
> Red Hat Enterprise Linux Workstation release 6.1 (Santiago)
>
>
> Tom Wlodek
>
>
>> Ok, the deltacloud gem pulls in the fog gem. It seems fog introduced the
>> dependency ~> 2.1.4 since fog version 0.10.0. When you install
>> deltacloud-core, the .gemspec should ensure you get version 2.1.4 of
>> net-ssh as required by fog. One way you may have ended up with version
>> 2.2.1 (which is in fact the latest), is if you already had it (e.g. due
>> to some unrelated installation/dependency).
>>> but when I do
>>>
>>> gem list
>>>
>>> I get
>>> ...
>>>
>>> net-ssh (2.2.1)
>>>
>>> so I have net-ssh installed.
>>>
>>> Any ideas?
>> Just fyi, you could have removed the net-ssh 2.2.1 and explicitly
>> installed the version that was required:
>>
>> gem uninstall net-ssh
>>
>> gem install net-ssh -v 2.1.4
>>
>> If you had then run gem install deltacloud-core it should have run fine.
>> But this is besides the point, we want the install to be as painless as
>> possible so any info you can provide about your setup will help me to
>> investigate further,
>>
>> thanks for reporting the issue, marios
>>
>>
>>> Tom W
>>>
>>> |
>>>
>>>
>
Re: GETTING STARTED WITH DELTACLOUD
Posted by Tom Wlodek <to...@bnl.gov>.
On 11/04/2011 01:14 PM, marios@redhat.com wrote:
> Hi Tom,
>
> I just spent some time looking at this:
>
> I tried to recreate this but was not able to (though I can see what the
> problem is with the net-ssh version.. more below). Can you tell us what
> OS/version you are using (I tried to recreate with a vanilla fedora 15
> intallation).
Hi, thanks for looking into that. As for the OS version:
cat /etc/redhat-release
Red Hat Enterprise Linux Workstation release 6.1 (Santiago)
Tom Wlodek
> Ok, the deltacloud gem pulls in the fog gem. It seems fog introduced the
> dependency ~> 2.1.4 since fog version 0.10.0. When you install
> deltacloud-core, the .gemspec should ensure you get version 2.1.4 of
> net-ssh as required by fog. One way you may have ended up with version
> 2.2.1 (which is in fact the latest), is if you already had it (e.g. due
> to some unrelated installation/dependency).
>> but when I do
>>
>> gem list
>>
>> I get
>> ...
>>
>> net-ssh (2.2.1)
>>
>> so I have net-ssh installed.
>>
>> Any ideas?
> Just fyi, you could have removed the net-ssh 2.2.1 and explicitly
> installed the version that was required:
>
> gem uninstall net-ssh
>
> gem install net-ssh -v 2.1.4
>
> If you had then run gem install deltacloud-core it should have run fine.
> But this is besides the point, we want the install to be as painless as
> possible so any info you can provide about your setup will help me to
> investigate further,
>
> thanks for reporting the issue, marios
>
>
>> Tom W
>>
>> |
>>
>>
Re: GETTING STARTED WITH DELTACLOUD
Posted by "marios@redhat.com" <ma...@redhat.com>.
Hi Tom,
I just spent some time looking at this:
On 01/11/11 20:22, Tom Wlodek wrote:
> and I did step by step the instructions. First the prerequisites:
> End of prerequisites. so far so good. But when I do
>
> gem install deltacloud-core
> ERROR: Error installing deltacloud-core:
> fog requires net-ssh (~> 2.1.4, runtime)
>
I tried to recreate this but was not able to (though I can see what the
problem is with the net-ssh version.. more below). Can you tell us what
OS/version you are using (I tried to recreate with a vanilla fedora 15
intallation).
Ok, the deltacloud gem pulls in the fog gem. It seems fog introduced the
dependency ~> 2.1.4 since fog version 0.10.0. When you install
deltacloud-core, the .gemspec should ensure you get version 2.1.4 of
net-ssh as required by fog. One way you may have ended up with version
2.2.1 (which is in fact the latest), is if you already had it (e.g. due
to some unrelated installation/dependency).
> but when I do
>
> gem list
>
> I get
> ...
>
> net-ssh (2.2.1)
>
> so I have net-ssh installed.
>
> Any ideas?
Just fyi, you could have removed the net-ssh 2.2.1 and explicitly
installed the version that was required:
gem uninstall net-ssh
gem install net-ssh -v 2.1.4
If you had then run gem install deltacloud-core it should have run fine.
But this is besides the point, we want the install to be as painless as
possible so any info you can provide about your setup will help me to
investigate further,
thanks for reporting the issue, marios
>
> Tom W
>
> |
>
>