# Ovswitch: No tap device found for nic 0 **URL:** \ **Category:** Product Support\ **Created:** [October 13, 2022, 1:31pm UTC](https://forum.opennebula.io/t/ovswitch-no-tap-device-found-for-nic-0/10881 "2022-10-13T13:31:23Z")\ **Posts on this page:** 4\ **Page:** 1
**Author:** ![opositorvlc2](https://avatars.discourse-cdn.com/v4/letter/o/46a35a/32.png) [@opositorvlc2](https://forum.opennebula.io/u/opositorvlc2)\ **Post date:** [October 13, 2022, 1:31pm UTC](https://forum.opennebula.io/t/ovswitch-no-tap-device-found-for-nic-0/10881/1 "2022-10-13T13:31:23Z")
Hi, My Opennebula setup: Frontend + Node : Rocky Linux 8.6 + OpenNebula 6.4.0 + KVM + ovswitch 2.17 ovswitch is configured correctly (I can receive and send traffic from/to Internet) Trying to start any VM (for instance Rocky Linux 8 from MarketPlace) I obtain this error: “DEPLOY: ovswitch: No tap device found for nic 0 ExitCode: 1” The started VM remains in state RUNNING but I can’t connect because opennebula doesn’t create a new port in the ovswitch bridge. However opennebula can create a new interface in the system (ip address). Thanks in advance. [root@localhost ~]# ovs-vsctl show 6f6d3911-b12a-43d2-b0e9-880369a896e8 Bridge ovsbr0 Port enp0s8 Interface enp0s8 Port ovsbr0 Interface ovsbr0 type: internal Port enp0s3 Interface enp0s3 ovs\_version: “2.17.3” Virtual Network template: BRIDGE = “ovsbr0” BRIDGE\_TYPE = “linux” DESCRIPTION = “A private network for VM inter-communication” DNS = “” GATEWAY = “192.168.1.1” NAME = “Private Network” NETWORK\_ADDRESS = “192.168.1.0” NETWORK\_MASK = “255.255.255.0” OUTER\_VLAN\_ID = “” PHYDEV = “enp0s3” SEARCH\_DOMAIN = “” SECURITY\_GROUPS = “0” VLAN\_ID = “” VN\_MAD = “ovswitch” [root@localhost ~]# ifconfig enp0s3: flags=4163\ mtu 1500 ether 08:00:27:83:a4:dd txqueuelen 1000 (Ethernet) RX packets 9154138 bytes 2175483509 (2.0 GiB) RX errors 0 dropped 0 overruns 0 frame 0 TX packets 204229 bytes 47832133 (45.6 MiB) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0 enp0s8: flags=4163\ mtu 1500 inet 172.20.20.5 netmask 255.255.255.0 broadcast 172.20.20.255 ether 08:00:27:87:b7:26 txqueuelen 1000 (Ethernet) RX packets 0 bytes 0 (0.0 B) RX errors 0 dropped 0 overruns 0 frame 0 TX packets 8491016 bytes 1556236871 (1.4 GiB) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0 lo: flags=73\ mtu 65536 inet 127.0.0.1 netmask 255.0.0.0 inet6 ::1 prefixlen 128 scopeid 0x10 loop txqueuelen 1000 (Local Loopback) RX packets 3392256 bytes 6689311852 (6.2 GiB) RX errors 0 dropped 0 overruns 0 frame 0 TX packets 3392256 bytes 6689311852 (6.2 GiB) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0 one-24-0: flags=4163\ mtu 1500 inet6 fe80::fc00:acff:fe14:1464 prefixlen 64 scopeid 0x20 ether fe:00:ac:14:14:64 txqueuelen 1000 (Ethernet) RX packets 21 bytes 1342 (1.3 KiB) RX errors 0 dropped 0 overruns 0 frame 0 TX packets 44 bytes 6431 (6.2 KiB) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0 ovsbr0: flags=4163\ mtu 1500 inet 1\*\*.1\*\*.207.125 netmask 255.255.254.0 broadcast 0.0.0.0 inet6 fe80::a00:27ff:fe83:a4dd prefixlen 64 scopeid 0x20 ether 08:00:27:83:a4:dd txqueuelen 1000 (Ethernet) RX packets 8675198 bytes 2019424197 (1.8 GiB) RX errors 0 dropped 16737 overruns 0 frame 0 TX packets 140308 bytes 37526462 (35.7 MiB) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0 virbr0: flags=4099\ mtu 1500 inet 192.168.124.1 netmask 255.255.255.0 broadcast 192.168.124.255 ether 52:54:00:b6:c5:f2 txqueuelen 1000 (Ethernet) RX packets 0 bytes 0 (0.0 B) RX errors 0 dropped 0 overruns 0 frame 0 TX packets 0 bytes 0 (0.0 B) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0 * * * My VM template: User template ERROR = “Thu Oct 13 09:37:20 2022: DEPLOY: ovswitch: No tap device found for nic 0 ExitCode: 1” LXD\_SECURITY\_PRIVILEGED = “true” Template AUTOMATIC\_DS\_REQUIREMENTS = “("CLUSTERS/ID" @\> 0)” AUTOMATIC\_NIC\_REQUIREMENTS = “("CLUSTERS/ID" @\> 0)” AUTOMATIC\_REQUIREMENTS = “(CLUSTER\_ID = 0) & !(PUBLIC\_CLOUD = YES) & !(PIN\_POLICY = PINNED)” CONTEXT = [ DISK\_ID = “1”, ETH0\_DNS = “”, ETH0\_EXTERNAL = “”, ETH0\_GATEWAY = “192.168.1.1”, ETH0\_GATEWAY6 = “”, ETH0\_IP = “172.20.20.100”, ETH0\_IP6 = “”, ETH0\_IP6\_GATEWAY = “”, ETH0\_IP6\_METHOD = “”, ETH0\_IP6\_METRIC = “”, ETH0\_IP6\_PREFIX\_LENGTH = “”, ETH0\_IP6\_ULA = “”, ETH0\_MAC = “02:00:ac:14:14:64”, ETH0\_MASK = “255.255.255.0”, ETH0\_METHOD = “”, ETH0\_METRIC = “”, ETH0\_MTU = “”, ETH0\_NETWORK = “192.168.1.0”, ETH0\_SEARCH\_DOMAIN = “”, ETH0\_VLAN\_ID = “”, ETH0\_VROUTER\_IP = “”, ETH0\_VROUTER\_IP6 = “”, ETH0\_VROUTER\_MANAGEMENT = “”, NETWORK = “YES”, SSH\_PUBLIC\_KEY = “”, TARGET = “hda” ] CPU = “1” DISK = [ ALLOW\_ORPHANS = “YES”, CLONE = “YES”, CLONE\_TARGET = “SYSTEM”, CLUSTER\_ID = “0”, DATASTORE = “default”, DATASTORE\_ID = “1”, DEV\_PREFIX = “vd”, DISK\_ID = “0”, DISK\_SNAPSHOT\_TOTAL\_SIZE = “0”, DISK\_TYPE = “FILE”, DRIVER = “qcow2”, FORMAT = “qcow2”, IMAGE = “Rocky Linux 8”, IMAGE\_ID = “8”, IMAGE\_STATE = “2”, LN\_TARGET = “SYSTEM”, ORIGINAL\_SIZE = “4096”, READONLY = “NO”, SAVE = “NO”, SIZE = “4096”, SOURCE = “/var/lib/one//datastores/1/df30e070da2fcd2cc0f1be3e2d9a42a6”, TARGET = “vda”, TM\_MAD = “ssh”, TYPE = “FILE” ] GRAPHICS = [ LISTEN = “0.0.0.0”, PORT = “5924”, TYPE = “vnc” ] MEMORY = “768” NIC = [ AR\_ID = “0”, BRIDGE = “ovsbr0”, BRIDGE\_TYPE = “openvswitch”, CLUSTER\_ID = “0”, GATEWAY = “192.168.1.1”, IP = “172.20.20.100”, MAC = “02:00:ac:14:14:64”, NAME = “NIC0”, NETWORK = “Private Network”, NETWORK\_ID = “4”, NIC\_ID = “0”, PHYDEV = “enp0s3”, SECURITY\_GROUPS = “0”, SSH = “YES”, TARGET = “one-24-0”, VN\_MAD = “ovswitch” ] OS = [ ARCH = “x86\_64”, UUID = “3ac67a4a-421f-466a-ad9c-3b520aaa0159” ] SECURITY\_GROUP\_RULE = [ PROTOCOL = “ALL”, RULE\_TYPE = “OUTBOUND”, SECURITY\_GROUP\_ID = “0”, SECURITY\_GROUP\_NAME = “default” ] SECURITY\_GROUP\_RULE = [ PROTOCOL = “ALL”, RULE\_TYPE = “INBOUND”, SECURITY\_GROUP\_ID = “0”, SECURITY\_GROUP\_NAME = “default” ] TEMPLATE\_ID = “8” TM\_MAD\_SYSTEM = “ssh” VMID = “24” My Logs: Thu Oct 13 09:37:16 2022 [Z0][VM][I]: New state is ACTIVE Thu Oct 13 09:37:16 2022 [Z0][VM][I]: New LCM state is PROLOG Thu Oct 13 09:37:18 2022 [Z0][VM][I]: New LCM state is BOOT Thu Oct 13 09:37:18 2022 [Z0][VMM][I]: Generating deployment file: /var/lib/one/vms/24/deployment.0 Thu Oct 13 09:37:19 2022 [Z0][VMM][I]: Successfully execute transfer manager driver operation: tm\_context. Thu Oct 13 09:37:19 2022 [Z0][VMM][I]: ExitCode: 0 Thu Oct 13 09:37:19 2022 [Z0][VMM][I]: Successfully execute network driver operation: pre. Thu Oct 13 09:37:19 2022 [Z0][VMM][I]: ExitCode: 0 Thu Oct 13 09:37:19 2022 [Z0][VMM][I]: Successfully execute virtualization driver operation: /bin/mkdir -p. Thu Oct 13 09:37:19 2022 [Z0][VMM][I]: ExitCode: 0 Thu Oct 13 09:37:19 2022 [Z0][VMM][I]: Successfully execute virtualization driver operation: /bin/cat - \>/var/lib/one//datastores/0/24/vm.xml. Thu Oct 13 09:37:19 2022 [Z0][VMM][I]: ExitCode: 0 Thu Oct 13 09:37:19 2022 [Z0][VMM][I]: Successfully execute virtualization driver operation: /bin/cat - \>/var/lib/one//datastores/0/24/ds.xml. Thu Oct 13 09:37:20 2022 [Z0][VMM][I]: ExitCode: 0 Thu Oct 13 09:37:20 2022 [Z0][VMM][I]: Successfully execute virtualization driver operation: deploy. Thu Oct 13 09:37:20 2022 [Z0][VMM][I]: Command execution fail (exit code: 1): cat \<\< EOT | /var/tmp/one/vnm/ovswitch/post ‘/var/lib/one//datastores/0/24 Thu Oct 13 09:37:20 2022 [Z0][VMM][I]: /var/lib/one//datastores/0/24/deployment.0 Thu Oct 13 09:37:20 2022 [Z0][VMM][I]: 3ac67a4a-421f-466a-ad9c-3b520aaa0159’ ‘cabernetvm’ Thu Oct 13 09:37:20 2022 [Z0][VMM][I]: No tap device found for nic 0 Thu Oct 13 09:37:20 2022 [Z0][VMM][I]: ExitCode: 1 Thu Oct 13 09:37:20 2022 [Z0][VMM][I]: error: failed to get domain ‘/var/lib/one//datastores/0/24/var/lib/one//datastores/0/24/deployment.03ac67a4a-421f-466a-ad9c-3b520aaa0159’ Thu Oct 13 09:37:20 2022 [Z0][VMM][I]: /var/tmp/one/datastore/xpath.rb:70:in `block in
': undefined method `elements’ for nil:NilClass (NoMethodError) Thu Oct 13 09:37:20 2022 [Z0][VMM][I]: from /var/tmp/one/datastore/xpath.rb:64:in `each' Thu Oct 13 09:37:20 2022 [Z0][VMM][I]: from /var/tmp/one/datastore/xpath.rb:64:in `’ Thu Oct 13 09:37:20 2022 [Z0][VMM][I]: Datastore path not found Thu Oct 13 09:37:20 2022 [Z0][VMM][I]: ExitCode: 0 Thu Oct 13 09:37:20 2022 [Z0][VMM][I]: Successfully execute virtualization driver operation: cancel. Thu Oct 13 09:37:20 2022 [Z0][VMM][I]: clean: Executed “sudo -n ovs-vsctl --if-exists del-port ovsbr0 one-24-0”. Thu Oct 13 09:37:20 2022 [Z0][VMM][I]: ExitCode: 0 Thu Oct 13 09:37:20 2022 [Z0][VMM][I]: Successfully execute network driver operation: clean. Thu Oct 13 09:37:20 2022 [Z0][VMM][I]: Failed to execute network driver operation: post. Thu Oct 13 09:37:20 2022 [Z0][VMM][E]: DEPLOY: ovswitch: No tap device found for nic 0 ExitCode: 1 Thu Oct 13 09:37:20 2022 [Z0][VM][I]: New LCM state is BOOT\_FAILURE Thu Oct 13 09:37:22 2022 [Z0][LCM][I]: VM reported RUNNING by the drivers Thu Oct 13 09:37:22 2022 [Z0][VM][I]: New LCM state is RUNNING ---
**Author:** ![dclavijo](https://yyz1.discourse-cdn.com/flex031/user_avatar/forum.opennebula.io/dclavijo/32/5265_2.png) [@dclavijo](https://forum.opennebula.io/u/dclavijo)\ **Post date:** [October 13, 2022, 1:35pm UTC](https://forum.opennebula.io/t/ovswitch-no-tap-device-found-for-nic-0/10881/2 "2022-10-13T13:35:36Z")
> Frontend + Node : Rocky Linux 8.6 + OpenNebula 6.4.0 + KVM + ovswitch 2.17 Rocky Linux is not a [supported platform](https://docs.opennebula.io/6.4/intro_release_notes/release_notes/platform_notes.html#certified-components-version) on frontend and virtualization nodes. It is only supported as a Guest OS. ---
**Author:** ![opositorvlc2](https://avatars.discourse-cdn.com/v4/letter/o/46a35a/32.png) [@opositorvlc2](https://forum.opennebula.io/u/opositorvlc2)\ **Post date:** [October 19, 2022, 2:49pm UTC](https://forum.opennebula.io/t/ovswitch-no-tap-device-found-for-nic-0/10881/3 "2022-10-19T14:49:44Z")
Now trying with Alma Linux as host and Rocky Linus as guest VM I’m getting this error: DEPLOY: error: Failed to create domain from /var/lib/one//datastores/0/3/deployment.0 error: invalid argument: could not get preferred machine for /usr/bin/qemu-kvm-one type=kvm Could not create domain from /var/lib/one//datastores/0/3/deployment.0 ExitCode: 255 ---
**Author:** ![dclavijo](https://yyz1.discourse-cdn.com/flex031/user_avatar/forum.opennebula.io/dclavijo/32/5265_2.png) [@dclavijo](https://forum.opennebula.io/u/dclavijo)\ **Post date:** [October 19, 2022, 3:46pm UTC](https://forum.opennebula.io/t/ovswitch-no-tap-device-found-for-nic-0/10881/4 "2022-10-19T15:46:12Z")
Make sure KVM is properly configured on your host. Or use LXC alternatively is KVM is unavailable.