Unable to run on CentOS

[lazyval]

$ cat /etc/issue
CentOS release 6.7 (Final)
Kernel \r on an \m
$ uname -a
Linux <snip> 2.6.32-573.12.1.el6.x86_64 #1 SMP Tue Dec 15 06:42:08 PST 2015 x86_64 x86_64 x86_64 GNU/Linux
$ bin/docker-machine-driver-kvm 
bin/docker-machine-driver-kvm: /usr/lib64/libvirt.so.0: version `LIBVIRT_1.1.1' not found (required by bin/docker-machine-driver-kvm)
bin/docker-machine-driver-kvm: /usr/lib64/libvirt.so.0: version `LIBVIRT_1.0.2' not found (required by bin/docker-machine-driver-kvm)
$ libvirtd --version
libvirtd (libvirt) 0.10.2

Any other info I need to provide in order to isolate issue?

For sure, I know that true way to use this driver is to issue following command, but it doesn't work either:

$ docker-machine create -d kvm myengine0
Error loading driver "kvm": dial tcp: missing address

[dhiltgen]

It looks like the centos 6.x version is too old. Not sure if RH has been backporting things for it upstream, but the mainline 0.10 release looks to be ~4 years old according to the libvirt.org page.

Not sure what the best course of action is. Looking at Centos 7, I see it has 1.2.17 libvirt, which is more likely to work (I don't have a physical centos box to test/confirm) If you're stuck on 6.x, you might consider downloading the source from http://libvirt.org/downloads.html to update it.

[lazyval]

Thanks for a quick response! Yup, we're stuck with Centos 6.x :-( I will test with a newer libvirt and let you know

[jhmnieuwenhuis]

I have the same issue as a normal user in centos 7:

docker-machine create -d kvm dockerhans1 dial tcp: missing address

When I login as root it works fine and the machine is created

Any ideas ?

[dhiltgen]

@jhmnieuwenhuis you probably haven't wired up group membership to allow your user account access to the libvirt socket. It depends on the distro, but I think most packaing sets it up as root only, but you can add members to a group (something like "libvirt" to allow access. Here's an example from my Ubuntu based system:

% ls -l /var/run/libvirt/libvirt-sock
srwxrwx--- 1 root libvirtd 0 Feb 29 17:24 /var/run/libvirt/libvirt-sock=
% groups
daniel adm cdrom sudo dip plugdev lpadmin sambashare docker libvirtd

[jhmnieuwenhuis]

spot on !! That solved the issue. B.t.w. Excellent job on the kvm plugin !!

Regards,

Hans Nieuwenhuis

[jhmnieuwenhuis]

One other question. When i create "normal" vm's on centos7 using virt-install i use lvm thin volumes. I suppose that's not possible when using docker-machine -d kvm ??

Regards, Hans

[dhiltgen]

That's not currently possible, but could be added.

If you wanted to take a crack at it and submit a PR, I think most of the logic would live within https://github.com/dhiltgen/docker-machine-kvm/blob/master/kvm.go#L654-L670 and perhaps a new command line flag to toggle the behavior.

[jhmnieuwenhuis]

Well that's not something I am able to do. My knowledge does not go that far. I consider myself a student although I am 60 years old and live in the Netherlands. Due to a serious accident I had to retire from work last year. I have always been a (project)manager in IT with an interest in programming and document management. These days I do voluntary work with elderly people, I love to tour on my bike and to keep my brain in shape I study. ( php, postgresql, symfony, drupal, centos7, kvm and since a week also docker) My plan is to create a drupal site with all kinds of information on above subjects and on bicycling. But thanks for the quick responses on my questions. If I can help by testing something, let me know.

Regards, Hans

[jhmnieuwenhuis]

Hi, two more observations

1) when I run docker-machine upgrade on a kvm machine as a non-root user it will not work. error : chmod /home/hn/.docker/machine/machines/docker1/boot2docker.iso: operation not permitted this file is owned by qemu:qemu

2) when I use "--kvm-network default" when creating the kvm machine, there wil be 2 network interfaces created one for source-network default and one for source-network docker-machines.

when i use "--kvm-network docker-machines" there are also two network interfaces created but they are both for source-network docker-machines

There where already kvm vm's created on my host before I used docker on it. They where created using virt-install and using source-network default.

Regards,

Hans

[dhiltgen]

1 is probably a genuine bug. I don't usually use upgrade in my workflow, so it may have regressed since I originally wrote the driver.

For #2, the driver could be enhanced to detect this case, but it shouldn't cause any major problems to have two interfaces on the same network.