For some reasons running
xe pif-scan host-uuid=....

it looks for /proc/net/bonding/<bridge_interface_name> whilst it does not exist on normal system. Tested on cleanly installed system too.
System in question: Ubuntu 14.04 LTS, Xen 4.4 (amd64).
I'm guessing it might be related to:
#38

bridge setup in standard Linux way using brctl and properly visible at Xen level.

xe network-list
uuid ( RO) : 5369a468-f639-b7ec-ddc1-b1d5861da84e
name-label ( RW): Pool-wide network associated with em1
name-description ( RW):
bridge ( RO): brem1

em1 is standard ethernet interface.

xe pif-list
uuid ( RO) : b6a218d3-8f7b-f9cd-c1f1-3f16a63cc785
device ( RO): em1
currently-attached ( RO): true
VLAN ( RO): -1
network-uuid ( RO): 5369a468-f639-b7ec-ddc1-b1d5861da84e

trying to scan for interfaces:
xe pif-scan host-uuid=0d83e699-df0b-40db-9934-b5cbc9e5eafe
The server failed to handle your request, due to an internal error. The given message may give details useful for debugging the problem.

Syslog messages:
Jan 2 14:06:09 silver xcp-networkd: [error|silver|174|PIF.scan R:01e4a6892f20|network_utils] Error: could not read /proc/net/bonding/brem1.

Jan 2 14:06:09 silver xapi: [debug|silver|1989 UNIX /var/lib/xcp/xapi||cli] Xapi_cli.exception_handler: Got exception INTERNAL_ERROR: [ Network_interface.Internal_error("Not_found") ]

Full dump:
Jan 2 14:06:09 silver xapi: [ info|silver|1989 UNIX /var/lib/xcp/xapi||cli] xe pif-scan host-uuid=0d83e699-df0b-40db-9934-b5cbc9e5eafe username=root password=(omitted)
Jan 2 14:06:09 silver xapi: [ info|silver|1989 UNIX /var/lib/xcp/xapi|session.login_with_password D:a1aba3612cfd|xapi] Session.create trackid=25343f1677c75cc6c8b5dbee602036ba pool=false uname=root originator=cli is_local_superuser=true auth_user_sid= parent=trackid=9834f5af41c964e225f24279aefe4e49
Jan 2 14:06:09 silver xapi: [debug|silver|1989 UNIX /var/lib/xcp/xapi|session.login_with_password D:a1aba3612cfd|mscgen] xapi=>xapi [label="session.get_uuid"];
Jan 2 14:06:09 silver xapi: [debug|silver|1990 UNIX /var/lib/xcp/xapi||dummytaskhelper] task dispatch:session.get_uuid D:b7d7411afdb3 created by task D:a1aba3612cfd
Jan 2 14:06:09 silver xapi: [debug|silver|1989 UNIX /var/lib/xcp/xapi|PIF.scan R:01e4a6892f20|audit] PIF.scan: host = '0d83e699-df0b-40db-9934-b5cbc9e5eafe (silver)'
Jan 2 14:06:09 silver xcp-networkd: [error|silver|174|PIF.scan R:01e4a6892f20|network_utils] Error: could not read /proc/net/bonding/brem1.
Jan 2 14:06:09 silver xapi: [debug|silver|1989 UNIX /var/lib/xcp/xapi|PIF.scan R:01e4a6892f20|backtrace] Called from file "list.ml", line 55, characters 20-23\nCalled from file "xapi_pif.ml", line 261, characters 4-68\nCalled from file "xapi_pif.ml", line 479, characters 9-37\nCalled from file "message_forwarding.ml", line 233, characters 25-44\nCalled from file "rbac.ml", line 227, characters 16-23\n
Jan 2 14:06:09 silver xapi: 20150102T13:06:09.062Z|audit|silver|1989 UNIX /var/lib/xcp/xapi|PIF.scan R:01e4a6892f20|audit ]' 'API' 'PIF.scan' (('host' 'silver' '0d83e699-df0b-40db-9934-b5cbc9e5eafe' 'OpaqueRef:0d0d7bf7-4d03-afc4-4280-8724014224ba')))
Jan 2 14:06:09 silver xapi: [debug|silver|1989 UNIX /var/lib/xcp/xapi|PIF.scan R:01e4a6892f20|backtrace] Raised at file "rbac.ml", line 236, characters 10-15\nCalled from file "server_helpers.ml", line 75, characters 11-41\n
Jan 2 14:06:09 silver xapi: [debug|silver|1989 UNIX /var/lib/xcp/xapi|PIF.scan R:01e4a6892f20|dispatcher] Server_helpers.exec exception_handler: Got exception INTERNAL_ERROR: [ Network_interface.Internal_error("Not_found") ]
Jan 2 14:06:09 silver xapi: [debug|silver|1989 UNIX /var/lib/xcp/xapi|PIF.scan R:01e4a6892f20|dispatcher] Raised at file "rbac.ml", line 236, characters 10-15\nCalled from file "server_helpers.ml", line 75, characters 11-41\n
Jan 2 14:06:09 silver xapi: [debug|silver|1989 UNIX /var/lib/xcp/xapi|PIF.scan R:01e4a6892f20|backtrace] Raised at file "rbac.ml", line 236, characters 10-15\nCalled from file "server_helpers.ml", line 75, characters 11-41\n
Jan 2 14:06:09 silver xapi: [debug|silver|1989 UNIX /var/lib/xcp/xapi|PIF.scan R:01e4a6892f20|xapi] Raised at file "server_helpers.ml", line 90, characters 14-15\nCalled from file "lib/pervasiveext.ml", line 22, characters 2-9\n
Jan 2 14:06:09 silver xapi: [debug|silver|1989 UNIX /var/lib/xcp/xapi|dispatch:PIF.scan D:a8b297444b68|xapi] Raised at file "lib/pervasiveext.ml", line 26, characters 22-25\nCalled from file "lib/debug.ml", line 57, characters 17-20\nRe-raised at file "lib/debug.ml", line 62, characters 10-11\nCalled from file "lib/pervasiveext.ml", line 22, characters 2-9\n
Jan 2 14:06:09 silver xapi: [debug|silver|1989 UNIX /var/lib/xcp/xapi|dispatch:PIF.scan D:a8b297444b68|backtrace] Raised at file "lib/pervasiveext.ml", line 26, characters 22-25\nCalled from file "lib/debug.ml", line 57, characters 17-20\nRe-raised at file "lib/debug.ml", line 62, characters 10-11\nCalled from file "lib/pervasiveext.ml", line 22, characters 2-9\nRe-raised at file "lib/pervasiveext.ml", line 26, characters 22-25\nCalled from file "server_helpers.ml", line 136, characters 10-106\nCalled from file "server.ml", line 19252, characters 23-161\nCalled from file "server_helpers.ml", line 115, characters 4-7\n
Jan 2 14:06:09 silver xapi: [debug|silver|1989 UNIX /var/lib/xcp/xapi||xapi] Raised at file "client.ml", line 6, characters 37-75\nCalled from file "client.ml", line 18, characters 55-110\nCalled from file "client.ml", line 8682, characters 6-53\nCalled from file "cli_operations.ml", line 3672, characters 10-45\nCalled from file "xapi_cli.ml", line 112, characters 18-56\nCalled from file "lib/pervasiveext.ml", line 22, characters 2-9\n
Jan 2 14:06:09 silver xapi: [ info|silver|1989 UNIX /var/lib/xcp/xapi|session.logout D:e73c5f0ec695|xapi] Session.destroy trackid=25343f1677c75cc6c8b5dbee602036ba
Jan 2 14:06:09 silver xapi: [debug|silver|1989 UNIX /var/lib/xcp/xapi||backtrace] Raised at file "lib/pervasiveext.ml", line 26, characters 22-25\nCalled from file "xapi_cli.ml", line 111, characters 2-138\nCalled from file "xapi_cli.ml", line 221, characters 7-44\nCalled from file "xapi_cli.ml", line 273, characters 4-23\n
Jan 2 14:06:09 silver xapi: [debug|silver|1989 UNIX /var/lib/xcp/xapi||cli] Xapi_cli.exception_handler: Got exception INTERNAL_ERROR: [ Network_interface.Internal_error("Not_found") ]
Jan 2 14:06:09 silver xapi: [debug|silver|1989 UNIX /var/lib/xcp/xapi||cli] Raised at file "lib/pervasiveext.ml", line 26, characters 22-25\nCalled from file "xapi_cli.ml", line 111, characters 2-138\nCalled from file "xapi_cli.ml", line 221, characters 7-44\nCalled from file "xapi_cli.ml", line 273, characters 4-23\n

Against 0.9.3 attempting to bring up a VLAN:

Oct 30 14:10:55 brontitall xcp-networkd: [debug|brontitall|271|VLAN.create R:8442d0f031e0|network_server] Bringing up interf
ace brem2
Oct 30 14:10:55 brontitall xcp-networkd: [ info|brontitall|271|VLAN.create R:8442d0f031e0|network_utils] /sbin/ip link set b
rem2 up
Oct 30 14:10:55 brontitall xcp-networkd: [debug|brontitall|271|VLAN.create R:8442d0f031e0|network_server] Adding port em2 to
 bridge brem2 with interfaces em2
Oct 30 14:10:55 brontitall xcp-networkd: [debug|brontitall|271|VLAN.create R:8442d0f031e0|network_server] Bringing up interf
ace em2
Oct 30 14:10:55 brontitall xcp-networkd: [ info|brontitall|271|VLAN.create R:8442d0f031e0|network_utils] /sbin/ip link set e
m2 up
Oct 30 14:10:55 brontitall tapdisk[8275]: tapdisk-control: init, 10 x 4k buffers
Oct 30 14:10:55 brontitall tapdisk[8275]: I/O queue driver: lio
Oct 30 14:10:55 brontitall tapdisk[8275]: tapdisk-log: started, level 0
Oct 30 14:10:55 brontitall xcp-networkd: [debug|brontitall|271|VLAN.create R:8442d0f031e0|network_server] Creating bridge xa
pi1 (VLAN 12 on bridge brem2)
Oct 30 14:10:55 brontitall tapdisk[8275]: nbd: Set up local unix domain socket on path '/var/run/blktap-control/nbdclient827
5'
Oct 30 14:10:55 brontitall xcp-networkd: [ info|brontitall|271|VLAN.create R:8442d0f031e0|network_utils] /sbin/ip link set x
api1 address bc:30:5b:ce:ef:de
Oct 30 14:10:55 brontitall xapi: [debug|brontitall|24752 UNIX /var/lib/xcp/xapi|VLAN.create R:8442d0f031e0|backtrace] Raised
 at file \"ghost-location\", line 1, characters 0-0\nCalled from file \"nm.ml\", line 396, characters 3-54\nCalled from file
 \"network.ml\", line 30, characters 2-6\n
Oct 30 14:10:55 brontitall xapi: [error|brontitall|24752 UNIX /var/lib/xcp/xapi|VLAN.create R:8442d0f031e0|network] Caught I
NTERNAL_ERROR: [ Network_interface.Internal_error("Failure(\"hd\")") ] while trying to talk to xcp-networkd
Oct 30 14:10:55 brontitall xapi: [error|brontitall|24752 UNIX /var/lib/xcp/xapi|VLAN.create R:8442d0f031e0|network] Re-raisi
ng as PIF_CONFIGURATION_ERROR [ OpaqueRef:e1513f0d-cb72-1300-1405-4f4524def3a2;  ]

On old (pre 8.0) versions it actually worked, now it crashes with internal error when infiniband interface is present in the system, probably caused by a different size of MAC address. The interface actually works, just crashes pif-scan

On my Ubuntu box I had to install these packages:

apt-get install libnl-route-3-200
apt-get install libffi-dev
apt-get install libnl-3-200

and then create these additional symlinks

ln -s /lib/x86_64-linux-gnu/libnl-3.so.200 /lib/x86_64-linux-gnu/libnl-3.so
ln -s /usr/lib/x86_64-linux-gnu/libnl-route-3.so.200 /usr/lib/x86_64-linux-gnu/libnl-route-3.so

before I could start xcp-networkd.

Hi all!

I'm trying to solve this issue: basically some LACP switch are blocking if LACP is not already configured on the host. So i'd like to support port bonding at install.

I've modified our installer and xapi to support it, but the firstboot fails in read_management_conf when trying to find the mac address associated with bond0 from xapi doc i think i can take the mac address from a member of the bond, is that correct?

Also, read_management_conf returns among other things an interface_config and a bridge_config and i'm not sure how they should be defined in the bonding case. Could you help me? :)

Thanks

Quick question for you @robhoes 😉

We got a use case for a "complex" deployment using a "bare metal cloud" provider. In this case, we need to:

• boot in UEFI
• using iPXE (we chainload to Grub2, then Xen)
• on iSCSI (SAN) for system drives

We managed to get it until host boot (also we improved our doc for this!). However, as soon xcp-networkd started, it's taking control on NICs, and cut the iSCSI connection.

Is there a way to tell xcp-networkd to leave the iSCSI NIC alone? (here, eth0 is the dedicated iSCSI NIC, and eth1 management).

When 'xe pif-scan' (I think) on a host with a bridge already setup (br0) built from [mirage/xen-arm-builder]. No logs around atm since syslog is broken.