[libvirt-users] running LXC hello world example
Hello, I am having difficulty getting any sort of LXC container running. I am trying to use the following tutorial to run the hello world example: https://www.berrange.com/posts/2011/09/27/getting-started-with-lxc-using-lib... Here are the results of my running the tutorial: [root@terraria ~]# virsh list Id Name State ---------------------------------------------------- [root@terraria ~]# virsh uri lxc:/// [root@terraria ~]# cat helloworld.xml <domain type='lxc'> <name>helloworld</name> <memory>102400</memory> <os> <type>exe</type> <init>/bin/sh</init> </os> <devices> <console type='pty'/> </devices> </domain> [root@terraria ~]# virsh define helloworld.xml Domain helloworld defined from helloworld.xml [root@terraria ~]# virsh start helloworld error: Failed to start domain helloworld error: internal error guest failed to start: PATH=/bin:/sbin TERM=linux container=lxc-libvirt container_uuid=791640de-95a9-082c-7292-c55106bcdca9 LIBVIRT_LXC_UUID=791640de-95a9-082c-7292-c55106bcdca9 LIBVIRT_LXC_NAME=helloworld /bin/sh error receiving signal from container: Input/output error --- As you can see, I am getting an error. How do I go about diagnosing this error? This is a fresh install so the only thing I have been using this machine for is for LXC/libvirt testing. -- Jacob Everist cell: 310-425-9732 email: jacob.everist@gmail.com
Some more details on my system. I am running CentOS 6.5. To install libvirt and LXC, I performed the following command: yum install libvirt libvirt-client python-virtinst I have turned selinux to DISABLED. On Wed, Jan 22, 2014 at 10:34 AM, Jacob Everist <jacob.everist@gmail.com>wrote:
Hello,
I am having difficulty getting any sort of LXC container running. I am trying to use the following tutorial to run the hello world example:
https://www.berrange.com/posts/2011/09/27/getting-started-with-lxc-using-lib...
Here are the results of my running the tutorial:
[root@terraria ~]# virsh list Id Name State ----------------------------------------------------
[root@terraria ~]# virsh uri lxc:///
[root@terraria ~]# cat helloworld.xml <domain type='lxc'> <name>helloworld</name> <memory>102400</memory> <os> <type>exe</type> <init>/bin/sh</init> </os> <devices> <console type='pty'/> </devices> </domain> [root@terraria ~]# virsh define helloworld.xml Domain helloworld defined from helloworld.xml
[root@terraria ~]# virsh start helloworld error: Failed to start domain helloworld error: internal error guest failed to start: PATH=/bin:/sbin TERM=linux container=lxc-libvirt container_uuid=791640de-95a9-082c-7292-c55106bcdca9 LIBVIRT_LXC_UUID=791640de-95a9-082c-7292-c55106bcdca9 LIBVIRT_LXC_NAME=helloworld /bin/sh error receiving signal from container: Input/output error
---
As you can see, I am getting an error. How do I go about diagnosing this error? This is a fresh install so the only thing I have been using this machine for is for LXC/libvirt testing.
-- Jacob Everist
cell: 310-425-9732 email: jacob.everist@gmail.com
-- Jacob Everist cell: 310-425-9732 email: jacob.everist@gmail.com
On 01/22/2014 11:42 AM, Jacob Everist wrote:
Some more details on my system.
I am running CentOS 6.5. To install libvirt and LXC, I performed the following command:
That may be your problem. LXC is not very well supported in RHEL 6 (it was marked as a technology preview, which means Red Hat is not supporting it - and CentOS just adds another layer of non-support). There has been LOTS of upstream work on LXC in the meantime (RHEL 6 uses libvirt 0.10.2, and upstream is now at 1.2.1). You probably want to try rebuilding libvirt from upstream tarballs, and/or trying the RHEL 7 beta, before trying anything serious with libvirt LXC support. -- Eric Blake eblake redhat com +1-919-301-3266 Libvirt virtualization library http://libvirt.org
Great! So I just wanted to confirm that the previous hello world example for LXC and libvirt was able to successfully work with RHEL beta 7, out of the box with no problems. You have to install libvirt though by: yum install libvirt-client libvirt On Wed, Jan 22, 2014 at 10:50 AM, Eric Blake <eblake@redhat.com> wrote:
On 01/22/2014 11:42 AM, Jacob Everist wrote:
Some more details on my system.
I am running CentOS 6.5. To install libvirt and LXC, I performed the following command:
That may be your problem. LXC is not very well supported in RHEL 6 (it was marked as a technology preview, which means Red Hat is not supporting it - and CentOS just adds another layer of non-support). There has been LOTS of upstream work on LXC in the meantime (RHEL 6 uses libvirt 0.10.2, and upstream is now at 1.2.1). You probably want to try rebuilding libvirt from upstream tarballs, and/or trying the RHEL 7 beta, before trying anything serious with libvirt LXC support.
-- Eric Blake eblake redhat com +1-919-301-3266 Libvirt virtualization library http://libvirt.org
-- Jacob Everist cell: 310-425-9732 email: jacob.everist@gmail.com
On Wed, Jan 22, 2014 at 10:42:15AM -0800, Jacob Everist wrote:
Some more details on my system.
I am running CentOS 6.5. To install libvirt and LXC, I performed the following command:
yum install libvirt libvirt-client python-virtinst
I have turned selinux to DISABLED.
When you say disabled, do you actually mean you booted with selinux=0 or do you just mean you set it to permissive. In RHEL-6 there was a bug that could break LXC if you boot with selinux=0. Running with selinux enabled, but in permissive mode should work just fine though.
On Wed, Jan 22, 2014 at 10:34 AM, Jacob Everist <jacob.everist@gmail.com>wrote:
Hello,
I am having difficulty getting any sort of LXC container running. I am trying to use the following tutorial to run the hello world example:
https://www.berrange.com/posts/2011/09/27/getting-started-with-lxc-using-lib...
Here are the results of my running the tutorial:
[root@terraria ~]# virsh list Id Name State ----------------------------------------------------
[root@terraria ~]# virsh uri lxc:///
[root@terraria ~]# cat helloworld.xml <domain type='lxc'> <name>helloworld</name> <memory>102400</memory> <os> <type>exe</type> <init>/bin/sh</init> </os> <devices> <console type='pty'/> </devices> </domain> [root@terraria ~]# virsh define helloworld.xml Domain helloworld defined from helloworld.xml
[root@terraria ~]# virsh start helloworld error: Failed to start domain helloworld error: internal error guest failed to start: PATH=/bin:/sbin TERM=linux container=lxc-libvirt container_uuid=791640de-95a9-082c-7292-c55106bcdca9 LIBVIRT_LXC_UUID=791640de-95a9-082c-7292-c55106bcdca9 LIBVIRT_LXC_NAME=helloworld /bin/sh error receiving signal from container: Input/output error
---
As you can see, I am getting an error. How do I go about diagnosing this error? This is a fresh install so the only thing I have been using this machine for is for LXC/libvirt testing.
You can try looking at /var/log/libvirt/lxc/$GUEST.log if that has insufficient info, then you can do service libvirtd stop edit /etc/libvirt/lxc.conf and set log_with_libvirtd=1 LIBVIRT_LOG_FILTERS=1:lxc LIBVIRT_LOG_OUTPUTS=1:stderr /usr/sbin/libvirt and then start the guest - the guest log file should then have much more info in it. Daniel -- |: http://berrange.com -o- http://www.flickr.com/photos/dberrange/ :| |: http://libvirt.org -o- http://virt-manager.org :| |: http://autobuild.org -o- http://search.cpan.org/~danberr/ :| |: http://entangle-photo.org -o- http://live.gnome.org/gtk-vnc :|
participants (3)
-
Daniel P. Berrange -
Eric Blake -
Jacob Everist