exec: "qemu-nbd": executable file not found in $PATH

[Nir Henn]

Hi all,

I am trying to build a new image using Capstan on a CentOS 6 box that is KVM enabled and face the following error.

capstan build -v titan

Building titan...

exec: "qemu-nbd": executable file not found in $PATH

Any thoughts how to overcome it?

Nir.

[Nadav Har'El]

In my Fedora, you get this by installing the "qemu-img" package. I hope (but didn't check) it is the same on Centos.

As a general trick, to find on RHEL/Fedora/Centos which package provides some executable you're looking for, you can try "yum whatprovides":

$ yum whatprovides "*/qemu-nbd"
...
2:qemu-img-2.1.2-6.fc21.x86_64 : QEMU command line tool for manipulating disk
                               : images
Repo        : @fedora
Matched from:
Filename    : /usr/bin/qemu-nbd

 

--

Nadav Har'El

n...@cloudius-systems.com

[Nir Henn]

Thanks Harel,

On CentOS

[cloud-user@titan ~]$ yum whatprovides "*/qemu-nbd"

Loaded plugins: fastestmirror

Determining fastest mirrors

 * base: centos.mirrors.hoobly.com

 * epel: mirror.hmc.edu

 * extras: mirror.web-ster.com

 * updates: mirror.hmc.edu

datastax                                                                                                                                   152/152

2:qemu-common-0.10.5-1.el5.2.x86_64 : QEMU common files needed by all QEMU targets

Repo        : epel

Matched from:

Filename    : /usr/bin/qemu-nbd

Installed it resolved the issue.

Now I am facing the following error which I have no clue how to resolve.

[cloud-user@titan titan-0.5.2-hadoop2]$ capstan build -v titan

Building titan...

dial tcp 127.0.0.1:10809: connection refused

Any clue?

Nir.

[Dor Laor]

Nir, can you first check if a capstan-example [1] project works?

It might be some Centos qemu issue.

[1] https://github.com/cloudius-systems/capstan-example

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[Pekka Enberg]

On Wed, Dec 10, 2014 at 11:49 AM, Nir Henn <nir....@gmail.com> wrote:

That means you don't have qemu-nbd installed. Apparently, it's part of
"qemu-common" package that's not available on RHEL. You can grab it
from Fedora, though:

http://wiki.xen.org/wiki/RHEL6_Xen4_Tutorial

- Pekka

[Pekka Enberg]

On Wed, Dec 10, 2014 at 12:12 PM, Nir Henn <nir....@gmail.com> wrote:

> Now I am facing the following error which I have no clue how to resolve.
>
> [cloud-user@titan titan-0.5.2-hadoop2]$ capstan build -v titan
>
> Building titan...
>
> dial tcp 127.0.0.1:10809: connection refused
>
> Any clue?

What Capstan version are you using? If you're able to build Capstan
from sources, please try this to make OSv more verbose during the
build process:

diff --git a/cmd/build.go b/cmd/build.go
index cec4549..886f3c3 100644
--- a/cmd/build.go
+++ b/cmd/build.go
@@ -52,7 +52,7 @@ func Build(r *util.Repo, image *core.Image, template
*core.Template, verbose boo
if err != nil {
return err
}
- if err := SetArgs(r, image.Hypervisor, image.Name,
"/tools/cpiod.so"); err != nil {
+ if err := SetArgs(r, image.Hypervisor, image.Name, "--verbose
/tools/cpiod.so"); err != nil {
return err
}
if template.RpmBase != nil {

- Pekka

[Nir Henn]

I am using the pre build version downloaded from github.
I will try to download the source and build it from scratch using the core you provided.

Nir.

[Pekka Enberg]

On Wed, Dec 10, 2014 at 3:12 PM, Nir Henn <nir....@gmail.com> wrote:
> I am using the pre build version downloaded from github.
> I will try to download the source and build it from scratch using the core you provided.

Great, thanks!

I applied this patch to master:

https://github.com/cloudius-systems/capstan/commit/cefa07672542e7b4e782d81a2dd9d47179c55924

So now if you use "-v" with capstan build, OSv boot process will also
be verbose.

- Pekka

[Nir Henn]

Hi Pekka,

We where able to stage the new Capstan on CentOS box as asked.

The errors are:

[cloud-user@titan titan-0.5.2-hadoop2]$ ../go/bin/capstan build cfile 

Building cfile...

nbd.c:nbd_trip():L653: invalid request type (3) received

EOF

Thoughts?

Nir.

[Nir Henn]

Adding Tzach,

Team, any chance that someone can look into it as it?

Nir.

[Tzach Livyatan]

Hi Nir

I'm trying to reproduce.

Is the problem exists for every Capstan project or just titan?

[Dor Laor]

On Wed, Dec 17, 2014 at 8:47 AM, Tzach Livyatan <tz...@cloudius-systems.com> wrote:

Hi Nir

I'm trying to reproduce.

Is the problem exists for every Capstan project or just titan?

It's Capstan - centos related. Nir tried this w/ capstan-example and it faulted too.

Pekka is on it as well

 

[Nir Henn]

Thats correct, i tried both the example and my specific project with same result.

Nir.

[Pekka Enberg]

On Wed, Dec 17, 2014 at 8:47 AM, Tzach Livyatan
<tz...@cloudius-systems.com> wrote:
>> Hi Nir
>> I'm trying to reproduce.
>> Is the problem exists for every Capstan project or just titan?

On Wed, Dec 17, 2014 at 10:30 AM, Dor Laor <d...@cloudius-systems.com> wrote:
> It's Capstan - centos related. Nir tried this w/ capstan-example and it
> faulted too.

Nir, this is CentOS 6, right? How did you install QEMU?

- Pekka

[Nir Henn]

Yes,

It is CentOS 6

[cloud-user@titan ~]$ cat /etc/centos-release

CentOS release 6.6 (Final)

The QEMU was installed using yum .

Nir