Howto update the kernel on ec2

[sean darcy]

First congratulations on a great setup to allow us clueless ones to pick 
an ec2 image and launch it directly into the region of our choice.

Very slick!

But...when you do it you get to a dialog where you can choose the kernel 
to use. The drop down list includes default and a number of AKI's 
(Amazon Kernel Images??) . How do you find out what the AKI's refer to 
in Fedora speak, i.e.  kernel-3.10.10-100.fc18.x86_64 ?? I googled some 
of the aki's , but found nothing.

Also, since the F19 ec2 instance only has one partition:

  df
Filesystem     1K-blocks    Used Available Use% Mounted on
/dev/xvda1       2032912 1088744    907784  55% /
devtmpfs          280236       0    280236   0% /dev
tmpfs             302208       0    302208   0% /dev/shm
tmpfs             302208     188    302020   1% /run
tmpfs             302208       0    302208   0% /sys/fs/cgroup

we should use an hd0 ( and not hd00 ) aki, correct?

But now I have an F19 instance running. Will I need to do some magic to 
upgrade the kernel, or is yum upgrade sufficient?

sean

[Bobby Powers]

The AKI used is a grub AKI which loads the Fedora kernel off of the
drive, based on the value in /boot/grub/menu.lst (or maybe grub.conf,
I forget).

On Tue, Sep 10, 2013 at 3:25 PM, Sean Darcy <seandarcy2(a)gmail.com&gt; wrote:
>  First congratulations on a great setup to allow us clueless ones to
> pick an
>  ec2 image and launch it directly into the region of our choice.
>
>  Very slick!
>
>  But...when you do it you get to a dialog where you can choose the kernel to
>  use. The drop down list includes default and a number of AKI's (Amazon
>  Kernel Images??) . How do you find out what the AKI's refer to in Fedora
>  speak, i.e.  kernel-3.10.10-100.fc18.x86_64 ?? I googled some of the aki's ,
>  but found nothing.
>
>  Also, since the F19 ec2 instance only has one partition:
>
>   df
>  Filesystem     1K-blocks    Used Available Use% Mounted on
>  /dev/xvda1       2032912 1088744    907784  55% /
>  devtmpfs          280236       0    280236   0% /dev
>  tmpfs             302208       0    302208   0% /dev/shm
>  tmpfs             302208     188    302020   1% /run
>  tmpfs             302208       0    302208   0% /sys/fs/cgroup
>
>  we should use an hd0 ( and not hd00 ) aki, correct?
>
>  But now I have an F19 instance running. Will I need to do some magic to
>  upgrade the kernel, or is yum upgrade sufficient?
>
>  sean
>
>
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[Matthew Miller]

On Tue, Sep 10, 2013 at 03:25:36PM -0400, Sean Darcy wrote:
>  But...when you do it you get to a dialog where you can choose the
>  kernel to use. The drop down list includes default and a number of
>  AKI's (Amazon Kernel Images??) . How do you find out what the AKI's
>  refer to in Fedora speak, i.e.  kernel-3.10.10-100.fc18.x86_64 ?? I
>  googled some of the aki's , but found nothing. 

>  we should use an hd0 ( and not hd00 ) aki, correct? 
Right. Use the pv-grub AKI for an unpartitioned image (the hd0 ones). See
http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/UserProvidedkernels.ht...
for more.

This will then use /boot/grub/menu.lst (which symlinks to
/boot/grub/grub.conf; implementation detail) to boot a kernel on the image.
(Grub isn't actually used on the images, just the config file. Also you may
notice that the images contain extlinux; that's because they're identical to
the downloadable qcow2 images meant to boot in openstack or other cloud
providers without pv-grub).


>  But now I have an F19 instance running. Will I need to do some magic
>  to upgrade the kernel, or is yum upgrade sufficient? 
Yum upgrade and reboot. We've endeavored to make the existing kernel magic
just work. Of course, there's a tiny chance that something will go horribly
wrong -- if it does, please report. (As a matter of course, make sure you're
not storing anything irreplaceable on a cloud instance anyway.)

-- 
Matthew Miller  ☁☁☁  Fedora Cloud Architect  ☁☁☁  <mattdm(a)fedoraproject.org&gt;

[sean darcy]

On 09/10/2013 03:44 PM, Matthew Miller wrote:
>  On Tue, Sep 10, 2013 at 03:25:36PM -0400, Sean Darcy wrote:
> > But...when you do it you get to a dialog where you can choose the
> > kernel to use. The drop down list includes default and a number of
> > AKI's (Amazon Kernel Images??) . How do you find out what the AKI's
> > refer to in Fedora speak, i.e.  kernel-3.10.10-100.fc18.x86_64 ?? I
> > googled some of the aki's , but found nothing.
>
>
> > we should use an hd0 ( and not hd00 ) aki, correct?
>
>  Right. Use the pv-grub AKI for an unpartitioned image (the hd0 ones). See
>
> http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/UserProvidedkernels.ht...
>  for more.
>
>  This will then use /boot/grub/menu.lst (which symlinks to
>  /boot/grub/grub.conf; implementation detail) to boot a kernel on the image.
>  (Grub isn't actually used on the images, just the config file. Also you may
>  notice that the images contain extlinux; that's because they're identical to
>  the downloadable qcow2 images meant to boot in openstack or other cloud
>  providers without pv-grub).
>
>
> > But now I have an F19 instance running. Will I need to do some magic
> > to upgrade the kernel, or is yum upgrade sufficient?
>
>  Yum upgrade and reboot. We've endeavored to make the existing kernel magic
>  just work. Of course, there's a tiny chance that something will go horribly
>  wrong -- if it does, please report. (As a matter of course, make sure you're
>  not storing anything irreplaceable on a cloud instance anyway.)
>  
Thanks for the quick response.

Is there any easy way to figure out what are aki kernels?

For instance, here are the kernels listed for ec2 region us-east-1:

us-east-1

aki-88aa75e1 pv-grub-hd0_1.03-x86_64.gz

aki-b6aa75df pv-grub-hd0_1.03-i386.gz

aki-b4aa75dd pv-grub-hd00_1.03-x86_64.gz

aki-b2aa75db pv-grub-hd00_1.03-i386.gz

How do you find out how these map to fedora kernels?

I guess as long as yum upgrade works, I really shouldn't care.

Again, thanks for making all this remarkably painless.

sean

[Matthew Miller]

On Tue, Sep 10, 2013 at 05:15:38PM -0400, Sean Darcy wrote:
> >http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/UserProvidedkernels.html#AmazonKernelImageIDs
[...]
>  Is there any easy way to figure out what are aki kernels? 
Yes, you look at the list Amazon provides.


>  How do you find out how these map to fedora kernels? 
They're registered when the AMI is uploaded by Release Engineering. You
really don't have to worry about this, but you can see it with
euca-describe-instances from the command line or by looking up the AMI on
Amazon's web site. (Or you can look at
http://thecloudmarket.com/image/ami-b22e5cdb--fedora-x86-64-19-20130627-s...,
although beware of that site's statistics page, because they're counting
_images_, not usage.)


>  I guess as long as yum upgrade works, I really shouldn't care.
That is definitely the goal.

>  Again, thanks for making all this remarkably painless. 
You're welcome. We appreciate the feedback!
-- 
Matthew Miller  ☁☁☁  Fedora Cloud Architect  ☁☁☁  <mattdm(a)fedoraproject.org&gt;

[Matthew Miller]

On Tue, Sep 10, 2013 at 05:47:54PM -0400, Matthew Miller wrote:
>  On Tue, Sep 10, 2013 at 05:15:38PM -0400, Sean Darcy wrote:
>  >
> >http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/UserProvidedkernels.html#AmazonKernelImageIDs
>  [...]
>  > Is there any easy way to figure out what are aki kernels?
>  Yes, you look at the list Amazon provides. 
That line was mean to be read with a smiley face, by the way -- not meant to
be snarky. That's really all there is to it -- they're just some special
images that Amazon provides, but they don't give them special memorable
names.

-- 
Matthew Miller  ☁☁☁  Fedora Cloud Architect  ☁☁☁  <mattdm(a)fedoraproject.org&gt;