[CentOS-virt] CentOS Images on AWS with partitions on /dev/xvda1 are awkwared to resize

[Kelly Prescott]

I think the command-line is far more flexable then the GUI interface.
I use ec2-api-tools, but the python boto stuff works virtually the same.



On Thu, 30 Apr 2015, Nico Kadel-Garcia wrote:

> On Wed, Apr 29, 2015 at 11:33 PM, Kelly Prescott <kprescott at coolip.net> wrote:
>> to follow-up, I will give an example.
>> Here is the listing for the official centos AMI:
>>
>> IMAGE   ami-96a818fe    aws-marketplace/CentOS 7 x86_64 (2014_09_29) EBS
>> HVM-b7ee8a69-ee97-4a49-9e68-afaee216db2e-ami-d2a117ba.2 aws-marketplace
>> available       public  [marketplace: aw0evgkw8e5c1q413zgy5pjce]
>> x86_64  machineebs      hvm     xen
>> BLOCKDEVICEMAPPING      EBS     /dev/sda1               snap-591037fd   8
>> false   standard                Not Encrypted
>> as you can see the block device mapping is by default set to
>> BLOCKDEVICEMAPPING      EBS     /dev/sda1               snap-591037fd   8
>> false   standard                Not Encrypted
>>
>> it is a standard volume, not encrypted, and 8 GB
>> my modification consists in adding this to my run command for my ami launch:
>>  -b /dev/sda1=snap-591037fd:20:false:gp2
>>
>> I set the drive the same, the snapshot the same, and I give it 20GB instead
>> of 8, I also use the gp2 type instead of the standard as well as telling it
>> not to delete the volume when the instance terminates.
>>
>> Hope this helps.
>> kp
>
> Perhaps so, and I appreciate the pointer. I can try to work with that
> to integrate command line based deployment and get this option.
>
> So you're working from the command line tools in the EPEL 'cloud-init'
> package, not the AWS GUI? Because when I tried expanding the size of
> the base disk image in the GUI, I wound up with an an 8 Gig default
> /dev/xvda1 on a 20 Gig /dev/xvda. That's why I was looking at "how do
> I resize this thing safel?"
>
> Unfortunately, it doesn't help a lot with what I already have built,
> but could be useful going forward.
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