[Bug 1757125] [NEW] DHCP relay doesn't work on boot when a lot of VLAN network interfaces

[EOLE team]

Public bug reported:

1) lsb_release -rd
Description:    Ubuntu 14.04.5 LTS
Release:        14.04

2) apt-cache policy isc-dhcp-relay
isc-dhcp-relay:
  Installé : 4.2.4-7ubuntu12.13
  Candidat : 4.2.4-7ubuntu12.13


We are using isc-dhcp package on Ubuntu trusty server.
The server has 4 physical network interfaces and several VLAN on eth2 interface.
dhcrelay is configured to relay dhcp requests from eth3 to VLAN interfaces.

On boot, depending on hardware velocity, the DHCP relay doesn't work.
In /etc/init/isc-dhcp-relay.conf, we can see "start on runlevel [2345]", but if all network interfaces are not ready, some errors appear in log file :
"2018-03-20T10:58:45.229688+01:00 amon.etb1.lan dhcrelay: Error getting hardware address for "eth2.4": No such device"
We must restart isc-dhcp-relay service once all network interfaces are ready.

To resolve this problem, we added /etc/init/isc-dhcp-relay.override file
containing "start on (runlevel [2345] and static-network-up)" to make
sure that isc-dhcp-relay starts when all network interfaces are ready.

Can we hope that you integrate this hotfix ?

** Affects: isc-dhcp (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1757125

Title:
  DHCP relay doesn't work on boot when a lot of VLAN network interfaces

Status in isc-dhcp package in Ubuntu:
  New

Bug description:
  1) lsb_release -rd
  Description:    Ubuntu 14.04.5 LTS
  Release:        14.04

  2) apt-cache policy isc-dhcp-relay
  isc-dhcp-relay:
    Installé : 4.2.4-7ubuntu12.13
    Candidat : 4.2.4-7ubuntu12.13

  
  We are using isc-dhcp package on Ubuntu trusty server.
  The server has 4 physical network interfaces and several VLAN on eth2 interface.
  dhcrelay is configured to relay dhcp requests from eth3 to VLAN interfaces.

  On boot, depending on hardware velocity, the DHCP relay doesn't work.
  In /etc/init/isc-dhcp-relay.conf, we can see "start on runlevel [2345]", but if all network interfaces are not ready, some errors appear in log file :
  "2018-03-20T10:58:45.229688+01:00 amon.etb1.lan dhcrelay: Error getting hardware address for "eth2.4": No such device"
  We must restart isc-dhcp-relay service once all network interfaces are ready.

  To resolve this problem, we added /etc/init/isc-dhcp-relay.override
  file containing "start on (runlevel [2345] and static-network-up)" to
  make sure that isc-dhcp-relay starts when all network interfaces are
  ready.

  Can we hope that you integrate this hotfix ?

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