October 2011 - Users - libvirt List Archives

[libvirt-users] Libvirt newbie, need help with doubts
by PREETHI RAMESH 07 Oct '11

07 Oct '11

Hi, These are my doubts: 1. I tried live migration of Ubuntu 11.04 from the one physical machine to another using the migrate() function. I connected via tcp in the destination URI and migrated successfully(lesser than 2 seconds). I tried running virsh list --all on the destination PM and confirmed that the VM had been migrated successfully. When I tried checking ps aux | grep vmname where vmname was the name of the VM migrated, I could see that on the source PM the thread was still active with the PID though the machine had been migrated successfully. Shouldn't the vmname not be listed at all on the source PM's side,if it has been completely migrated? Isn't 2 seconds too little(considering the memory allotted to the VM was 128MB and I'm using a 100Mbps LAN switch, time taken=size/speed~10 seconds). Why is virsh list --all showing me that the VM migrated to be shutdown on the source PM? If it's been completely migrated, shouldn't the entry be removed completely? 2. Is there any way to set the CPU limit in terms of % of CPU used on a VCPU using libvirt function? As in, if I want my VM to use just 10% of VCPU 1. 3. I'm developing an application in Java to monitor VM usage(Memory,CPU, Network etc). Are there any easily integrable graph plotting applications I could integrate with? Thanks for your time. Regards, Preethi

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[libvirt-users] Reg: shutdown/restart from within the container(system LXC)
by Alphonse Hansel Anthony 07 Oct '11

07 Oct '11

Hi, Is it possible to shutdown/restart a system LXC from within the container? From what I have observed(Version - 0.8.4): * The libvirt_lxc manager process, which listens on the /dev/pts for console connection loops infinitely. Let me know If I am missing out something obvious or there exists any other way to shutdown/restart system LXC from within. Any pointers in this regard would be useful. Thanks, Alphonse

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[libvirt-users] Libvirt for custom VM
by ankur deshwal 07 Oct '11

07 Oct '11

Hi, I need to create an application where I can use a single interface for different VMs (libvirt becomes an obvious choice then). However I will need to control a VM running on custom hypervisor other than ones currently supported by libvirt. Is it possible to add a new interface to the hypervisor (easily)? Shall I try to use "test-hypervisor" supported by libvirt ?? I shall be grateful for some initial pointers to read which can help me for the task. Thanks and Regards, Ankur

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[libvirt-users] Need help debugging virtio net issue
by Darren Dao 05 Oct '11

05 Oct '11

This is what I use for creating the VM sudo virt-install -n myvm -r 2048 --vcpus=1 --accelerate -v -w bridge:br0,model=virtio --nographics -m 54:52:00:01:bb:8d --disk path=/storage_pool/myvm.raw,size=20,bus=virtio --pxe It used to work fine, but now it get stuck trying to do pxeboot/kickstart. Here's what I see when trying to debug the pxeboot/kickstart process: * Querying DHCP server for IP address went through fine * vmlinuz.CentOS5-5.5-x86_64 was downloaded successfully * initrd.img.CentOS5-5.5-x86_64 started to get transferred, but then stopped. It looks like the VM's network interface just crashed (can't even ping the VM anymore) If I don't use virtio for networking, then everything went through fine. What's strange that is virtio used to work fine. I ran out of ideas/ways to debug this issue. Any has any idea? Here's more info on my system: Host: * Scientific Linux 6, kernel version: 2.6.32-71.el6.x86_64 * libvirt: 0.8.1-27 * qemu-kvm: 0.12.1.2-2.113 Guest: * Scientific Linux 6, kernel version: 2.6.32-71.el6.x86_64

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[libvirt-users] libvir: Remote error : cannot recv data: : Connection reset by peer
by PREETHI RAMESH 04 Oct '11

04 Oct '11

I'm using Libvirt's Java API and connecting to the hypervisor using the same. My program is such that periodic discovery of active VMs is done using Libvirt's functions. However, when I try to perform any VM related operations while the Java code connecting to Qemu is running such as shutdown, start VM using virsh, I end up with : 'libvir: Remote error : cannot recv data: : Connection reset by peer' on my Java IDE and 'error: cannot recv data: : Connection reset by peer error: failed to connect to the hypervisor' on the terminal running virsh. I'm using QEMU emulator version 0.14.0 (qemu-kvm-0.14.0) and Libvirt version 0.4.7 on Ubuntu 11.04. Please help me out! Thanks.

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[libvirt-users] Usage serial device
by David Goulet 04 Oct '11

04 Oct '11

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Hi, I'm trying to connect the *same* serial device to two KVM Linux machines where one is running KGDB and the other uses the connected serial to interact with the target machine running under KGDB. However, I'm unable to do so. Using a pty port, I am able to use my kgdb setup with host/VM but unable to make it work with VM/VM since it's two different pty created on the two machines. Anyone on this list can help me with that kind of setup ? Unfortunately, I must use libvirtd 0.7.5 for now... I'm aware that it might be a version issue here but still... Thanks! David -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.10 (GNU/Linux) iQEcBAEBAgAGBQJOihLOAAoJEELoaioR9I02GawH/1Ux197Pj3F+Qf54LcI3yy+w Vhd8yOGIAreBES7FUIf/7dCFqUz2mXFbtRuo9KZi+M0qs02kEs/nbhgOJLmHdZFA iRdCprzCR4Ue1x8H/tVogfBElfGhlJDaPHx5KIsxDmXwPJYhrPBt8qhyzLSTVQZG /pibv03sQdGRM6ZIyIhbA3ZmZ7Yh0SToGl3Fodw5Yp6YjrxRtpTu/OkHuHweM+nq wxthsgVstAEjJSxwV5O1+GzQ8xVDzjvZTvSRXnU2mTKXTiW2CkbnPbDG7cYfAcdx jICcAOf4AHtuKt5ZTfXFMUT4qSPfEntoXKsjt1IpCOpYH70GNGxLkh96SKjS1+w= =AYT3 -----END PGP SIGNATURE-----

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[libvirt-users] Second VM cannot get dhcp ip in NAT mode
by Magicloud Magiclouds 03 Oct '11

03 Oct '11

Hi, Yesterday I started to use libvirt with kvm under centos6. The first VM works great. Today I added another VM and start to initialize with virt-install. Well, it seems that, the second VM cannot get dhcp ip. I did not change the default libvirt network configuration. What should I do? -- 竹密岂妨流水过山高哪阻野云飞

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[libvirt-users] qemu+ssh fails with "packet received from server too large"
by Trey Dockendorf 01 Oct '11

01 Oct '11

I'm attempting to connect to my KVM host from a remote system, but am unable to connect using virsh. I'm able to connect if I disable sasl on the KVM host... The KVM host is on CentOS 6 x86_64 with libvirt-0.8.1 Here's the command I'm using, --------- $ virsh -c qemu+ssh://kvmhost.tld/system error: packet received from server too large error: failed to connect to the hypervisor Here's the uncommented lines in my /etc/libvirt/libvirtd.conf ----------- listen_tls = 1 listen_tcp = 0 listen_addr = "...." (set to eth0) key_file = "/var/lib/puppet/ssl/private_keys/kvmhost.tld.pem" cert_file = "/var/lib/puppet/ssl/certs/kvmhost.tld.pem" ca_file = "/var/lib/puppet/ssl/certs/ca.pem" log_level = 1 log_filters="1:remote 1:event" log_outputs="1:syslog:libvirtd 1:file:/var/log/libvirt/libvirtd.log" There is no output in /var/log/libvirt/libvirtd.log while trying to connect remotely through virsh. The only logs that are generated are /var/log/secure, -------------- Sep 30 19:34:53 kvmhost sshd[20074]: Accepted publickey for foreman from 10.1.0.1 port 55269 ssh2 Sep 30 19:34:53 kvmhost sshd[20074]: pam_unix(sshd:session): session opened for user foreman by (uid=0) Sep 30 19:34:53 kvmhost sshd[20074]: pam_unix(sshd:session): session closed for user foreman I've also opened up the port through iptables, 1 ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 tcp dpt:16514 And I don't see anything being blocked by SELinux during these connection attempts. Is there possibly a log filter I could enable to shed more light on this? Any help is greatly appreciated. Thanks - Trey

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