[ovirt-users] Passing custom script to cloud init using api
Juan Hernandez
jhernand at redhat.com
Wed Sep 10 08:37:06 UTC 2014
On 09/10/2014 06:44 AM, Shanil S wrote:
> Hi Juan,
>
> What i am planning to do is to make work the following script
>
> #cloud-config
>
> # phone_home: if this dictionary is present, then the phone_home
> # cloud-config module will post specified data back to the given
> # url
> # default: none
> # phone_home:
> # url: http://my.foo.bar/$INSTANCE/
> # post: all
> # tries: 10
> #
> phone_home:
> url: http://my.example.com/$INSTANCE_ID/
> post: [ pub_key_dsa, pub_key_rsa, pub_key_ecdsa, instance_id ]
>
> (http://cloudinit.readthedocs.org/en/latest/topics/examples.html#run-commands-on-first-boot)
>
> but it wasn't working when i tried, i hope to post the above values to
> the specific url and get the posted details.
>
I think it should work, but it depends completely on cloud-init itself.
I'd suggest you check the content of the generated cloud-init
configuration file (as described in a previous mail). If it contains the
"phone_home" section then you can discard a problem with oVirt, and
focus on clud-init.
>
> On Wed, Sep 10, 2014 at 10:02 AM, Shanil S <xielesshanil at gmail.com
> <mailto:xielesshanil at gmail.com>> wrote:
>
> Hi Juan,
>
> Okay.. Thanks.. its working.
>
> I would like to execute other page something like test_script.php by
> posting some values to it using the cloud init, Is it possible to do
> it ?
>
>
>
> --
> Regards
> Shanil
>
> On Fri, Sep 5, 2014 at 10:08 PM, Juan Hernandez <jhernand at redhat.com
> <mailto:jhernand at redhat.com>> wrote:
>
> On 09/05/2014 12:55 PM, Shanil S wrote:
> > Hi Juan,
> >
> > Thanks for your reply.
> >
> > I tried with the above but i was unable to find the 'iwashere.txt' after
> > executing the above xml.
> >
>
> I repeated the test, this time with 3.4, and it worked fine for
> me. As
> the formatting of the XML is very important I'd suggest that you
> take
> the attached script (instead of copy & paste from the mail),
> change the
> password and VM id and run it.
>
> There are two kind of things that can go wrong here. One is that the
> engine/VDSM combination may not be generating the right file. To
> verify
> this start the VM with the attached script, and once it is
> started go to
> the hypervisor where it is running and find the corresponding
> qemu process:
>
> # ps -ef | grep -- '-name myvm'
>
> This will give you a very long command line. That command line
> should
> include a "-drive" option containing the full path of the disk image
> generated by the engine/VDSM, something like this:
>
> -drive
> file=/var/run/vdsm/payload/b5f087d4-022d-4d5f-8a1e-268c562c7bb1.b6fcddff571bb8c2028c61b623d172a6.img
>
> To inspect its content make a copy (just in case) and mount it:
>
> # cp -drive
> file=/var/run/vdsm/payload/b5f087d4-022d-4d5f-8a1e-268c562c7bb1.b6fcddff571bb8c2028c61b623d172a6.img
> /root/my.img
> # mount -o loop,ro /root/my.img /mnt
>
> Inspect the content:
>
> # find /mnt
> /mnt/openstack
> /mnt/openstack/content
> /mnt/openstack/content/0000
> /mnt/openstack/latest
> /mnt/openstack/latest/meta_data.json
> /mnt/openstack/latest/user_data
>
> The content of the custom-script should be at the end of the
> "user_data"
> file, so take a look at that:
>
> # cat /mnt/openstack/latest/user_data
> #cloud-config
> ssh_pwauth: true
> disable_root: 0
> output:
> all: '>> /var/log/cloud-init-output.log'
> user: root
> password: mypassword
> chpasswd:
> expire: false
> runcmd:
> - 'sed -i ''/^datasource_list: /d'' /etc/cloud/cloud.cfg; echo
> ''datasource_list:
> ["NoCloud", "ConfigDrive"]'' >> /etc/cloud/cloud.cfg'
> runcmd:
> - echo "I was here!" > /iwashere.txt
>
> If your custom script isn't there then there is some problem in the
> engine/VDSM side, otherwise the problem is probably in cloud-init
> itself, and we will need someone with more knowledge of
> cloud-init to
> debug it.
>
> Don't forget to umount the file when finished:
>
> # umount /mnt
>
> >
> > On Fri, Sep 5, 2014 at 3:00 PM, Juan Hernandez <jhernand at redhat.com <mailto:jhernand at redhat.com>
> > <mailto:jhernand at redhat.com <mailto:jhernand at redhat.com>>> wrote:
> >
> > On 09/05/2014 10:46 AM, Sven Kieske wrote:
> > >
> > >
> > > Am 05.09.2014 10:27, schrieb Juan Hernandez:
> > >> Trying to make an example for this I discovered that
> the "custom_script"
> > >> element is currently ignored if the "cloud_init"
> element is present.
> > >> Instead we are taking the content of the first "file"
> element from the
> > >> "cloud_init" element and appending it to the cloud-init
> configuration
> > >> file. I believe that this is a bug, as it breaks
> backwards compatibility:
> > >>
> > >> https://bugzilla.redhat.com/1138564
> > >
> > > Thanks for the report, I just proposed this as a blocker
> for the 3.4.4
> > > release as it is a clear regression.
> > > Also I rely on this functionality in my 3.3. setup and I
> want to upgrade
> > > to 3.4 so I can't upgrade until this is fixed and released.
> >
> > Agree, I set the bug as a blocker for 3.4.4.
> >
> > >>
> > >> However, you can exploit this bug to do what you want.
> This is an example:
> > >
> > > Well I guess this is a pretty bad idea, because it will
> just work
> > > until the bug is fixed?
> > >
> >
> > No, what I proposed in the example is to put the custom
> script in both
> > the first "file" inside "clud_init" and in the
> "custom_script" element.
> > That should work with the current status and also if/when
> we fix the
> > bug.
> >
>
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