[ovs-discuss] OVS - QEMU unable to create vhostuserclient socket at /var/run/openvswitch
Ian Stokes
ian.stokes at intel.com
Thu May 16 14:32:38 UTC 2019
On 5/16/2019 3:04 PM, Joan Vidal wrote:
> Hi,
>
> I'm trying to use OVS-DPDK vhostuserclient ports with a qemu guest on a
> CentOS host.
>
> QEMU guest fails to start with the following error:
>
> error: internal error: process exited while connecting to monitor:
> 2019-05-16T13:15:27.481680Z qemu-kvm: -chardev
> socket,id=charnet2,path=/var/run/openvswitch/vhost0,server: Failed to
> bind socket: Permission denied
> 2019-05-16T13:15:27.482078Z qemu-kvm: -chardev
> socket,id=charnet2,path=/var/run/openvswitch/vhost0,server: chardev:
> opening backend "socket" failed
>
>
> Seems to be an issue with qemu-kvm permission to create the sockets in
> /var/run/openvswitch
> Followed this article
> https://www.redhat.com/en/blog/ovs-dpdk-migrating-vhostuser-socket-mode-red-hat-openstack
>
> But is showing same error. Even running qemu-kvm and openvswitch with
> root is still returning Permission denied.
>
>
> This is the system configuration:
>
> --------------------------
> Software versions:
>
> (Host) CentOS Linux release 7.6.1810 (Core)
> (Guest) CentOS Linux release 7.4.1708 (Core)
> QEMU emulator version 1.5.3 (qemu-kvm-1.5.3-160.el7_6.1)
The minimum QEMU version recommended for use with vhostuserclient is
QEMU 2.7 (See OVS Documentation below).
http://docs.openvswitch.org/en/latest/topics/dpdk/vhost-user/#vhost-user-vs-vhost-user-client
Do you see the same issue when using QEMU 2.7?
Also from below it looks like you are using libvirt to configure QEMU?
If so have you followed the steps outlined in the link below
http://docs.openvswitch.org/en/latest/topics/dpdk/vhost-user/#adding-vhost-user-ports-to-the-guest-libvirt
Ian
> ovs-vswitchd (Open vSwitch) 2.11.1
> DPDK 18.11.0
>
>
> --------------------------
> OVS configuration
>
>
> #ovs-vsctl show
> 462375d2-8f6a-4a72-ad49-af8c00720da9
> Bridge br-subscriber
> Port br-subscriber
> Interface br-subscriber
> type: internal
> Port "ens1f0"
> Interface "ens1f0"
> type: dpdk
> options: {dpdk-devargs="0000:81:00.0"}
> Port "vhost0"
> Interface "vhost0"
> type: dpdkvhostuserclient
> options: {vhost-server-path="/var/run/openvswitch/vhost0"}
> Bridge br-internet
> Port br-internet
> Interface br-internet
> type: internal
> Port "vhost1"
> Interface "vhost1"
> type: dpdkvhostuserclient
> options: {vhost-server-path="/var/run/openvswitch/vhost1"}
> Port "ens1f1"
> Interface "ens1f1"
> type: dpdk
> options: {dpdk-devargs="0000:81:00.1"}
> ovs_version: "2.11.1"
>
> #ovs-vsctl get Open_vSwitch . other_config
> {dpdk-init="true", dpdk-socket-mem="0,2048", pmd-cpu-mask="0x02000200"}
>
>
> #cat /etc/sysconfig/openvswitch
> OPTIONS=""
> OVS_USER_ID="openvswitch:hugetlbfs"
>
>
> # ls -la /var/run/openvswitch/
> total 12
> drwxrwsr-x. 3 openvswitch hugetlbfs 260 May 16 12:00 .
> drwxr-xr-x. 29 root root 920 May 16 12:14 ..
> srwxr-x---. 1 openvswitch hugetlbfs 0 May 16 12:00 br-internet.mgmt
> srwxr-x---. 1 openvswitch hugetlbfs 0 May 16 12:00 br-internet.snoop
> srwxr-x---. 1 openvswitch hugetlbfs 0 May 16 12:00 br-subscriber.mgmt
> srwxr-x---. 1 openvswitch hugetlbfs 0 May 16 12:00 br-subscriber.snoop
> srwxr-x---. 1 openvswitch hugetlbfs 0 May 16 12:00 db.sock
> drwx------. 3 openvswitch hugetlbfs 60 May 16 12:00 dpdk
> srwxr-x---. 1 openvswitch hugetlbfs 0 May 16 12:00 ovsdb-server.21194.ctl
> -rw-r--r--. 1 openvswitch hugetlbfs 6 May 16 12:00 ovsdb-server.pid
> srwxr-x---. 1 openvswitch hugetlbfs 0 May 16 12:00 ovs-vswitchd.21250.ctl
> -rw-r--r--. 1 openvswitch hugetlbfs 6 May 16 12:00 ovs-vswitchd.pid
> -rw-r--r--. 1 root root 41 May 16 12:00 useropts
>
>
> --------------------------
> qemu configuration
>
> #cat /etc/libvirt/qemu.conf
> user = "qemu"
> group = "hugetlbfs"
>
> Vhostuser parameters used when starting guest with /usr/libexec/qemu-kvm
>
> -chardev socket,id=charnet2,path=/var/run/openvswitch/vhost0,server
> -netdev vhost-user,chardev=charnet2,id=hostnet2 -device
> virtio-net-pci,netdev=hostnet2,id=net2,mac=0c:c4:7a:ea:4b:b2,bus=pci.0,addr=0x5
> -chardev socket,id=charnet3,path=/var/run/openvswitch/vhost1,server
> -netdev vhost-user,chardev=charnet3,id=hostnet3 -device
> virtio-net-pci,netdev=hostnet3,id=net3,mac=0c:c4:7a:ea:4b:b3,bus=pci.0,addr=0x6
>
> --------------------------
>
> Logs
>
> /var/log/openvswitch/ovs-vswitchd.log
> 2019-05-16T13:05:23.421Z|00142|dpdk|INFO|VHOST_CONFIG: vhost-user
> client: socket created, fd: 62
> 2019-05-16T13:05:23.421Z|00143|netdev_dpdk|INFO|vHost User device
> 'vhost0' created in 'client' mode, using client socket
> '/var/run/openvswitch/vhost0'
> 2019-05-16T13:05:23.421Z|00144|dpdk|WARN|VHOST_CONFIG: failed to connect
> to /var/run/openvswitch/vhost0: No such file or directory
> 2019-05-16T13:05:23.421Z|00145|dpdk|INFO|VHOST_CONFIG:
> /var/run/openvswitch/vhost0: reconnecting...
> 2019-05-16T13:05:23.421Z|00146|dpif_netdev|INFO|Core 9 on numa node 1
> assigned port 'ens1f0' rx queue 0 (measured processing cycles 123318).
> 2019-05-16T13:05:23.421Z|00147|dpif_netdev|INFO|Core 25 on numa node 1
> assigned port 'ens1f1' rx queue 0 (measured processing cycles 46293).
> 2019-05-16T13:05:23.421Z|00148|dpif_netdev|WARN|There's no available
> (non-isolated) pmd thread on numa node 0. Queue 0 on port 'vhost0' will
> be assigned to the pmd on core 25 (numa node 1). Expect reduced performance.
> 2019-05-16T13:05:23.421Z|00149|bridge|INFO|bridge br-internet: added
> interface vhost0 on port 3
> 2019-05-16T13:05:58.525Z|00150|bridge|INFO|bridge br-internet: deleted
> interface vhost0 on port 3
> 2019-05-16T13:05:58.525Z|00151|dpif_netdev|INFO|Core 9 on numa node 1
> assigned port 'ens1f0' rx queue 0 (measured processing cycles 244368).
> 2019-05-16T13:05:58.525Z|00152|dpif_netdev|INFO|Core 25 on numa node 1
> assigned port 'ens1f1' rx queue 0 (measured processing cycles 92211).
> 2019-05-16T13:06:08.335Z|00153|dpdk|INFO|VHOST_CONFIG: vhost-user
> client: socket created, fd: 62
> 2019-05-16T13:06:08.335Z|00154|netdev_dpdk|INFO|vHost User device
> 'vhost1' created in 'client' mode, using client socket
> '/var/run/openvswitch/vhost1'
> 2019-05-16T13:06:08.335Z|00155|dpdk|WARN|VHOST_CONFIG: failed to connect
> to /var/run/openvswitch/vhost1: No such file or directory
> 2019-05-16T13:06:08.335Z|00156|dpdk|INFO|VHOST_CONFIG:
> /var/run/openvswitch/vhost1: reconnecting...
>
> Any idea will be apreciated, thanks!
>
>
>
> *Joan Vidal*
>
> *OmniAccess*
>
>
>
>
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