[ovs-discuss] OVS - QEMU unable to create vhostuserclient socket at /var/run/openvswitch

Joan Vidal Joan.Vidal at omniaccess.com
Thu May 16 14:04:00 UTC 2019


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)
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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