Red Hat Bugzilla – Bug 970809
cupsd fails to start if configured to listen on not-yet-configured IP addresses
Last modified: 2015-02-10 09:17:57 EST
Description of problem:
When specify network interfaces in /etc/cups/cupsd.conf in 'Listen' directive (e.g.
then after system boot I will get cupsd listening only on loopback. Merging messages and cupsd logs according to time I have some as:
Jun 5 01:44:00 klempak kernel: [ 0.652548] loop: module loaded
Jun 5 01:44:00 klempak kernel: [ 8.054364] e100 0000:07:00.0 eth0: addr 0xe0125000, irq 21, MAC addr 00:d0:b7:55:1a:b3
Jun 5 01:44:00 klempak kernel: [ 8.078727] e100 0000:07:01.0 eth1: addr 0xe0124000, irq 22, MAC addr 00:02:b3:bb:7f:e3
Jun 5 01:44:00 klempak kernel: [ 8.323997] e1000e 0000:00:19.0 eth2: (PCI Express:2.5GT/s:Width x1) 00:19:d1:e0:ef:c0
Jun 5 01:44:00 klempak kernel: [ 8.325961] e1000e 0000:00:19.0 eth2: Intel(R) PRO/1000 Network Connection
Jun 5 01:44:00 klempak kernel: [ 8.327943] e1000e 0000:00:19.0 eth2: MAC: 6, PHY: 6, PBA No: FFFFFF-0FF
Jun 5 01:44:01 klempak network: Aktivování rozhraní loopback: [ OK ]
I [05/Jun/2013:01:44:02 +0200] Full reload complete.
I [05/Jun/2013:01:44:02 +0200] Cleaning out old files in "/var/spool/cups/tmp"...
I [05/Jun/2013:01:44:02 +0200] Cleaning out old files in "/var/cache/cups"...
E [05/Jun/2013:01:44:02 +0200] Unable to open listen socket for address [v1.::1]:631 - Address family not supported by protocol.
I [05/Jun/2013:01:44:02 +0200] Listening to 127.0.0.1:631 on fd 11...
E [05/Jun/2013:01:44:02 +0200] Unable to bind socket for address 192.168.0.250:631 - Cannot assign requested address.
E [05/Jun/2013:01:44:02 +0200] Unable to bind socket for address 192.168.2.250:631 - Cannot assign requested address.
I [05/Jun/2013:01:44:02 +0200] Listening to /var/run/cups/cups.sock:631 on fd 3...
I [05/Jun/2013:01:44:02 +0200] Resuming new connection processing...
Jun 5 01:44:04 klempak kernel: [ 16.085595] e1000e: eth0 NIC Link is Up 1000 Mbps Full Duplex, Flow Control: None
Jun 5 01:44:04 klempak network: Aktivuji rozhraní eth0: [ OK ]
Jun 5 01:44:07 klempak kernel: [ 19.077266] e100 0000:07:01.0 eth3: NIC Link is Up 100 Mbps Full Duplex
Jun 5 01:44:07 klempak network: Aktivuji rozhraní eth2: [ OK ]
Jun 5 01:44:09 klempak network: Aktivuji rozhraní eth3: [ OK ]
As is evident, cupsd tries bind to interface address several seconds before they are inicialized (e.g. 7 seconds before is initialized eth3).
Version-Release number of selected component (if applicable):
Always - for five reboots I have no successful cupsd start with listening on all interfaces.
Interfaces are started by '/etc/init.d/network' script
Please avoid expletives.
As a general rule, please always file service-specific issues against the service's package at first, because in most cases that's where the bug is.
[Reassigning to cups.]
To cups maintainers:
Could cups use the IP_FREEBIND socket option (man 7 ip)? It would allow it to start listening regardless of the current state of the network interfaces.
To the reporter:
As a workaround, you can add the "After=network.target" ordering dependency to cups.service, for example by saving this fragment as /etc/systemd/system/cups.service.d/workaround.conf :
I'm building cups-1.7-0.7.b1.fc20 in rawhide with the change to use IP_FREEBIND. If there are no problems with it we can consider back-porting that to released versions later.
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