Ohai Plugin Running External Commands

Douglas_Garstang · December 3, 2014, 4:28pm

Has anyone got any examples of custom ohai plugins calling external shell
commands in ruby and returning the result? Having trouble with it. Need to
pull some EC2 tags into chef (via AWS CLI) and an ohai plugin seemed like
the right idea.

Doug

Matt_Ray_GETCHEF · December 3, 2014, 4:35pm

Lots of examples in the lib/ohai/plugins/ directory for things called
by Mixlib::ShellOut. Check this

github.com

chef/ohai/blob/main/lib/ohai/plugins/kernel.rb#L102


      
          
          # given the ProductType value from WMI's Win32_OperatingSystem class
          # https://msdn.microsoft.com/en-us/library/aa394239(v=vs.85).aspx
          # return either workstation or server
          # @param [Integer] type ProductType value from Win32_OperatingSystem
          # @return [String] Workstation or Server
          def product_type_decode(type)
            return "Workstation" if type == 1
          
            "Server"
          end
          
          # decode the OSType field from WMI Win32_OperatingSystem class
          # https://msdn.microsoft.com/en-us/library/aa394239(v=vs.85).aspx
          # @param [Integer] sys_type OSType value from Win32_OperatingSystem
          # @return [String] the human consumable OS type value
          def os_type_decode(sys_type)
            case sys_type
            when 18 then "WINNT" # most likely so first
            when 0 then "Unknown"
            when 1 then "Other"

Thanks,
Matt Ray
Director of Partner Integration :: Chef
matt@chef.io :: 512.731.2218
mattray :: GitHub :: IRC :: Twitter

On Wed, Dec 3, 2014 at 10:28 AM, Douglas Garstang
doug.garstang@gmail.com wrote:

Has anyone got any examples of custom ohai plugins calling external shell
commands in ruby and returning the result? Having trouble with it. Need to
pull some EC2 tags into chef (via AWS CLI) and an ohai plugin seemed like
the right idea.

Doug

Jeremy_Mauro · December 3, 2014, 4:45pm

Here is one of our ohai :
lspci = Mixlib::ShellOut.new(
‘lspci -m’,
<% if node[‘platform_family’] == ‘windows’ -%>
:cwd => “<%= node[:pciutils][:path] %>”,
<% end -%>
)
lspci.run_command
stdout, stderr = [lspci.stdout, lspci.stderr]

From: Douglas Garstang [mailto:doug.garstang@gmail.com]
Sent: mercredi 3 décembre 2014 17:28
To: chef@lists.opscode.com
Subject: [chef] Ohai Plugin Running External Commands

Has anyone got any examples of custom ohai plugins calling external shell commands in ruby and returning the result? Having trouble with it. Need to pull some EC2 tags into chef (via AWS CLI) and an ohai plugin seemed like the right idea.
Doug

Douglas_Garstang · December 3, 2014, 6:20pm

Thanks.

I was actually trying to get a list of ec2 instances having tags with
specific values. I don't want to use chef search due to the requirement
that all the nodes must have successfully completed a chef run first.

Douglas.

On Wed, Dec 3, 2014 at 8:45 AM, Jeremy Mauro j.mauro@criteo.com wrote:

Here is one of our ohai :

lspci = Mixlib::ShellOut.new(
'lspci -m',
<% if node['platform_family'] == 'windows' -%>
:cwd => "<%= node[:pciutils][:path] %>",
<% end -%>

)

lspci.run_command

stdout, stderr = [lspci.stdout, lspci.stderr]

From: Douglas Garstang [mailto:doug.garstang@gmail.com]
Sent: mercredi 3 décembre 2014 17:28
To: chef@lists.opscode.com
Subject: [chef] Ohai Plugin Running External Commands

Has anyone got any examples of custom ohai plugins calling external shell
commands in ruby and returning the result? Having trouble with it. Need to
pull some EC2 tags into chef (via AWS CLI) and an ohai plugin seemed like
the right idea.

Doug

--
Regards,

Douglas Garstang
http://www.linkedin.com/in/garstang
Email: doug.garstang@gmail.com
Cell: +1-805-340-5627

Dennis_Lovely · December 3, 2014, 6:31pm

You can search with AWS CLI:

ec2-describe-instances --filter "tag:YourTagName=YourRequestedValue"

Is this what you're looking for?

hth

-Dennis

On Wed, Dec 3, 2014 at 10:20 AM, Douglas Garstang doug.garstang@gmail.com
wrote:

Thanks.

I was actually trying to get a list of ec2 instances having tags with
specific values. I don't want to use chef search due to the requirement
that all the nodes must have successfully completed a chef run first.

Douglas.

On Wed, Dec 3, 2014 at 8:45 AM, Jeremy Mauro j.mauro@criteo.com wrote:
Here is one of our ohai :

lspci = Mixlib::ShellOut.new(
'lspci -m',
<% if node['platform_family'] == 'windows' -%>
:cwd => "<%= node[:pciutils][:path] %>",
<% end -%>

)

lspci.run_command

stdout, stderr = [lspci.stdout, lspci.stderr]

From: Douglas Garstang [mailto:doug.garstang@gmail.com]
Sent: mercredi 3 décembre 2014 17:28
To: chef@lists.opscode.com
Subject: [chef] Ohai Plugin Running External Commands

Has anyone got any examples of custom ohai plugins calling external shell
commands in ruby and returning the result? Having trouble with it. Need to
pull some EC2 tags into chef (via AWS CLI) and an ohai plugin seemed like
the right idea.

Doug
--
Regards,

Douglas Garstang
http://www.linkedin.com/in/garstang
Email: doug.garstang@gmail.com
Cell: +1-805-340-5627

Douglas_Garstang · December 3, 2014, 6:36pm

Dennis,

Of course. It's just translating that into something that ohai runs and
returns as a dictionary that's tricky. The plugin also has to run the aws
cli to get it's environment and role and feed that back into the
describe-instances to get a list of matching instances. It seems like a
rather clunky approach. I certainly don't want to run chef search due to
the whole having-to-have-already run thing, which means the chef client has
to then get run multiple times. Not scalable.

Douglas.

On Wed, Dec 3, 2014 at 10:31 AM, Dennis Lovely dl@aegisco.com wrote:

You can search with AWS CLI:

ec2-describe-instances --filter "tag:YourTagName=YourRequestedValue"

Is this what you're looking for?

hth

-Dennis

On Wed, Dec 3, 2014 at 10:20 AM, Douglas Garstang <doug.garstang@gmail.com

wrote:
Thanks.

I was actually trying to get a list of ec2 instances having tags with
specific values. I don't want to use chef search due to the requirement
that all the nodes must have successfully completed a chef run first.

Douglas.

On Wed, Dec 3, 2014 at 8:45 AM, Jeremy Mauro j.mauro@criteo.com wrote:
Here is one of our ohai :

lspci = Mixlib::ShellOut.new(
'lspci -m',
<% if node['platform_family'] == 'windows' -%>
:cwd => "<%= node[:pciutils][:path] %>",
<% end -%>

)

lspci.run_command

stdout, stderr = [lspci.stdout, lspci.stderr]

From: Douglas Garstang [mailto:doug.garstang@gmail.com]
Sent: mercredi 3 décembre 2014 17:28
To: chef@lists.opscode.com
Subject: [chef] Ohai Plugin Running External Commands

Has anyone got any examples of custom ohai plugins calling external
shell commands in ruby and returning the result? Having trouble with it.
Need to pull some EC2 tags into chef (via AWS CLI) and an ohai plugin
seemed like the right idea.

Doug
--
Regards,

Douglas Garstang
http://www.linkedin.com/in/garstang
Email: doug.garstang@gmail.com
Cell: +1-805-340-5627

--
Regards,

Douglas Garstang
http://www.linkedin.com/in/garstang
Email: doug.garstang@gmail.com
Cell: +1-805-340-5627

dcondomitti · December 3, 2014, 7:24pm

I would recommend using the API directly instead of shelling out to aws-cli just to parse it back into a machine readable format. Fog[0] is a good place to start and supports multiple cloud providers if you end up going down that route. I don’t know for sure that it allows searching by instance tag (over listing all instances and filtering) but I would expect that it does.

Dan

[0] GitHub - fog/fog: The Ruby cloud services library.

On Wednesday, December 3, 2014 at 1:36 PM, Douglas Garstang wrote:

Dennis,

Of course. It's just translating that into something that ohai runs and returns as a dictionary that's tricky. The plugin also has to run the aws cli to get it's environment and role and feed that back into the describe-instances to get a list of matching instances. It seems like a rather clunky approach. I certainly don't want to run chef search due to the whole having-to-have-already run thing, which means the chef client has to then get run multiple times. Not scalable.

Douglas.

On Wed, Dec 3, 2014 at 10:31 AM, Dennis Lovely <dl@aegisco.com (mailto:dl@aegisco.com)> wrote:

You can search with AWS CLI:
ec2-describe-instances --filter "tag:YourTagName=YourRequestedValue"
Is this what you're looking for?
hth

-Dennis

On Wed, Dec 3, 2014 at 10:20 AM, Douglas Garstang <doug.garstang@gmail.com (mailto:doug.garstang@gmail.com)> wrote:

Thanks.

I was actually trying to get a list of ec2 instances having tags with specific values. I don't want to use chef search due to the requirement that all the nodes must have successfully completed a chef run first.

Douglas.

On Wed, Dec 3, 2014 at 8:45 AM, Jeremy Mauro <j.mauro@criteo.com (mailto:j.mauro@criteo.com)> wrote:

Here is one of our ohai :
lspci = Mixlib::ShellOut.new(
'lspci -m',
<% if node['platform_family'] == 'windows' -%>
:cwd => "<%= node[:pciutils][:path] %>",
<% end -%>
)
lspci.run_command
stdout, stderr = [lspci.stdout, lspci.stderr]

From: Douglas Garstang [mailto:doug.garstang@gmail.com]
Sent: mercredi 3 décembre 2014 17:28
To: chef@lists.opscode.com (mailto:chef@lists.opscode.com)
Subject: [chef] Ohai Plugin Running External Commands

Has anyone got any examples of custom ohai plugins calling external shell commands in ruby and returning the result? Having trouble with it. Need to pull some EC2 tags into chef (via AWS CLI) and an ohai plugin seemed like the right idea.

Doug

--
Regards,

Douglas Garstang
http://www.linkedin.com/in/garstang
Email: doug.garstang@gmail.com (mailto:doug.garstang@gmail.com)
Cell: +1-805-340-5627 (tel:%2B1-805-340-5627)

--
Regards,

Douglas Garstang
http://www.linkedin.com/in/garstang
Email: doug.garstang@gmail.com (mailto:doug.garstang@gmail.com)
Cell: +1-805-340-5627

Douglas_Garstang · December 3, 2014, 7:59pm

Don't suppose you know if fog lets you perform AWS operations without an
access key/secret access key when the instance belongs to an IAM profile?
Can't find specific docs on this, and when I leave them out (which I can do
with python boto), it just complains they are missing.

I'm also installing fog with "gem install fog –no-ri –no-rdoc" and have
been waiting about 20 minutes for for "Parsing documentation for
fog-1.25.0" to complete on an m3.large EC2 instance.

Doug.

On Wed, Dec 3, 2014 at 11:24 AM, Daniel Condomitti daniel@condomitti.com
wrote:

I would recommend using the API directly instead of shelling out to
aws-cli just to parse it back into a machine readable format. Fog[0] is a
good place to start and supports multiple cloud providers if you end up
going down that route. I don’t know for sure that it allows searching by
instance tag (over listing all instances and filtering) but I would expect
that it does.

Dan

[0] GitHub - fog/fog: The Ruby cloud services library.

On Wednesday, December 3, 2014 at 1:36 PM, Douglas Garstang wrote:

Dennis,

Of course. It's just translating that into something that ohai runs and
returns as a dictionary that's tricky. The plugin also has to run the aws
cli to get it's environment and role and feed that back into the
describe-instances to get a list of matching instances. It seems like a
rather clunky approach. I certainly don't want to run chef search due to
the whole having-to-have-already run thing, which means the chef client has
to then get run multiple times. Not scalable.

Douglas.

On Wed, Dec 3, 2014 at 10:31 AM, Dennis Lovely dl@aegisco.com wrote:

You can search with AWS CLI:

ec2-describe-instances --filter "tag:YourTagName=YourRequestedValue"

Is this what you're looking for?

hth

-Dennis

On Wed, Dec 3, 2014 at 10:20 AM, Douglas Garstang <doug.garstang@gmail.com

wrote:

Thanks.

I was actually trying to get a list of ec2 instances having tags with
specific values. I don't want to use chef search due to the requirement
that all the nodes must have successfully completed a chef run first.

Douglas.

On Wed, Dec 3, 2014 at 8:45 AM, Jeremy Mauro j.mauro@criteo.com wrote:

Here is one of our ohai :

lspci = Mixlib::ShellOut.new(
'lspci -m',
<% if node['platform_family'] == 'windows' -%>
:cwd => "<%= node[:pciutils][:path] %>",
<% end -%>

)

lspci.run_command

stdout, stderr = [lspci.stdout, lspci.stderr]

From: Douglas Garstang [mailto:doug.garstang@gmail.com]
Sent: mercredi 3 décembre 2014 17:28
To: chef@lists.opscode.com
Subject: [chef] Ohai Plugin Running External Commands

Has anyone got any examples of custom ohai plugins calling external shell
commands in ruby and returning the result? Having trouble with it. Need to
pull some EC2 tags into chef (via AWS CLI) and an ohai plugin seemed like
the right idea.

Doug

--
Regards,

Douglas Garstang
http://www.linkedin.com/in/garstang
Email: doug.garstang@gmail.com
Cell: +1-805-340-5627

--
Regards,

Douglas Garstang
http://www.linkedin.com/in/garstang
Email: doug.garstang@gmail.com
Cell: +1-805-340-5627

--
Regards,

Douglas Garstang
http://www.linkedin.com/in/garstang
Email: doug.garstang@gmail.com
Cell: +1-805-340-5627

AJ_Christensen2 · December 3, 2014, 8:05pm

Yes, you can have Fog uses AWS IAM Machine Keys.

Are the tags available via the AWS Metadata API? (169.254.169.254...)
If so, I'd extend the existing AWS cloud plugin to capture what you
want; it already interacts with that API endpoint.

cheers,

--aj

On Thu, Dec 4, 2014 at 8:59 AM, Douglas Garstang
doug.garstang@gmail.com wrote:

Don't suppose you know if fog lets you perform AWS operations without an
access key/secret access key when the instance belongs to an IAM profile?
Can't find specific docs on this, and when I leave them out (which I can do
with python boto), it just complains they are missing.

I'm also installing fog with "gem install fog –no-ri –no-rdoc" and have been
waiting about 20 minutes for for "Parsing documentation for fog-1.25.0" to
complete on an m3.large EC2 instance.

Doug.

On Wed, Dec 3, 2014 at 11:24 AM, Daniel Condomitti daniel@condomitti.com
wrote:
I would recommend using the API directly instead of shelling out to
aws-cli just to parse it back into a machine readable format. Fog[0] is a
good place to start and supports multiple cloud providers if you end up
going down that route. I don’t know for sure that it allows searching by
instance tag (over listing all instances and filtering) but I would expect
that it does.

Dan

[0] GitHub - fog/fog: The Ruby cloud services library.

On Wednesday, December 3, 2014 at 1:36 PM, Douglas Garstang wrote:

Dennis,

Of course. It's just translating that into something that ohai runs and
returns as a dictionary that's tricky. The plugin also has to run the aws
cli to get it's environment and role and feed that back into the
describe-instances to get a list of matching instances. It seems like a
rather clunky approach. I certainly don't want to run chef search due to the
whole having-to-have-already run thing, which means the chef client has to
then get run multiple times. Not scalable.

Douglas.

On Wed, Dec 3, 2014 at 10:31 AM, Dennis Lovely dl@aegisco.com wrote:

You can search with AWS CLI:

ec2-describe-instances --filter "tag:YourTagName=YourRequestedValue"

Is this what you're looking for?

hth

-Dennis

On Wed, Dec 3, 2014 at 10:20 AM, Douglas Garstang
doug.garstang@gmail.com wrote:

Thanks.

I was actually trying to get a list of ec2 instances having tags with
specific values. I don't want to use chef search due to the requirement that
all the nodes must have successfully completed a chef run first.

Douglas.

On Wed, Dec 3, 2014 at 8:45 AM, Jeremy Mauro j.mauro@criteo.com wrote:

Here is one of our ohai :

lspci = Mixlib::ShellOut.new(
'lspci -m',
<% if node['platform_family'] == 'windows' -%>
:cwd => "<%= node[:pciutils][:path] %>",
<% end -%>

)

lspci.run_command

stdout, stderr = [lspci.stdout, lspci.stderr]

From: Douglas Garstang [mailto:doug.garstang@gmail.com]
Sent: mercredi 3 décembre 2014 17:28
To: chef@lists.opscode.com
Subject: [chef] Ohai Plugin Running External Commands

Has anyone got any examples of custom ohai plugins calling external shell
commands in ruby and returning the result? Having trouble with it. Need to
pull some EC2 tags into chef (via AWS CLI) and an ohai plugin seemed like
the right idea.

Doug

--
Regards,

Douglas Garstang
http://www.linkedin.com/in/garstang
Email: doug.garstang@gmail.com
Cell: +1-805-340-5627

--
Regards,

Douglas Garstang
http://www.linkedin.com/in/garstang
Email: doug.garstang@gmail.com
Cell: +1-805-340-5627
--
Regards,

Douglas Garstang
http://www.linkedin.com/in/garstang
Email: doug.garstang@gmail.com
Cell: +1-805-340-5627

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Ohai Plugin Running External Commands

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