CentOS - Dec 2015 - Network services start before network is up since migrating to 7.2

----- Mail original -----
> De: "Gordon Messmer" <gordon.messmer at gmail.com>
> ?: "centos" <centos at centos.org>
> Envoy?: Vendredi 18 D?cembre 2015 12:06:26
> Objet: Re: [CentOS] Network services start before network is up since
migrating to 7.2
>>> The network service is not blocking  the flow so it executes and
systemd
>>> carries on ...
>>>
>>>  From the point of view of the system as soon as
/etc/init.d/network start
>>> has been called the service is running as a state... as you can see
from
>>> your logs lots of other services also start before the network
interface
>>> itself is up.
>> I understand this, but why only on one of my servers ? Is the order the
services
>> start only a question of latencies ?
I'm confused. I updated two more servers this afternoon, and... all is
working well. The services start in correct order. Even after three reboots.
So only one of the (now) five updated servers doesn't start properly.

Then what is the difference ? All I see for now is the network.target unit seems
not active on the failing server.

(failing) # systemctl list-units|grep network
network.service                                                                 
loaded active exited    LSB: Bring up/down networking
rhel-import-state.service                                                       
loaded active exited    Import network configuration from initramfs
network-online.target                                                           
loaded active active    Network is Online
(failing) # systemctl status network
? network.service - LSB: Bring up/down networking
   Loaded: loaded (/etc/rc.d/init.d/network)
   Active: active (exited) since lun. 2015-12-21 12:49:31 CET; 1 day 5h ago
     Docs: man:systemd-sysv-generator(8)

d?c. 21 12:49:35 (failing) systemd[1]: Starting LSB: Bring up/down networking...
d?c. 21 12:49:26 (failing) network[747]: Activation de l'interface loopback
:  [  OK  ]
d?c. 21 12:49:28 (failing) network[747]: Activation de l'interface ens160 : 
[  OK  ]
d?c. 21 12:49:31 (failing) network[747]: Activation de l'interface ens192 : 
[  OK  ]
d?c. 21 12:49:31 (failing) systemd[1]: Started LSB: Bring up/down networking.


(correct) # systemctl list-units|grep network
network.service                                                                 
loaded active exited    LSB: Bring up/down networking
rhel-import-state.service                                                       
loaded active exited    Import network configuration from initramfs
network-online.target                                                           
loaded active active    Network is Online
network.target                                                                  
loaded active active    Network
(correct) # systemctl status network
? network.service - LSB: Bring up/down networking
   Loaded: loaded (/etc/rc.d/init.d/network)
   Active: active (exited) since mar. 2015-12-22 17:42:15 CET; 33min ago
     Docs: man:systemd-sysv-generator(8)
  Process: 753 ExecStart=/etc/rc.d/init.d/network start (code=exited,
status=0/SUCCESS)

d?c. 22 17:42:07 (correct) systemd[1]: Starting LSB: Bring up/down networking...
d?c. 22 17:42:10 (correct) network[753]: Activation de l'interface loopback
:  [  OK  ]
d?c. 22 17:42:13 (correct) NET[935]: /etc/sysconfig/network-scripts/ifup-post :
updated /etc/resolv.conf
d?c. 22 17:42:13 (correct) network[753]: Activation de l'interface ens160 : 
[  OK  ]
d?c. 22 17:42:15 (correct) network[753]: Activation de l'interface ens192 : 
[  OK  ]
d?c. 22 17:42:15 (correct) systemd[1]: Started LSB: Bring up/down networking.


To be continued...

Sylvain.

Pensez ENVIRONNEMENT : n'imprimer que si ncessaire

On 12/22/2015 09:45 AM, Sylvain CANOINE wrote:
> I'm confused. I updated two more servers this afternoon, and... all is
working well. The services start in correct order. Even after three reboots.
> So only one of the (now) five updated servers doesn't start properly.
>
> Then what is the difference ? All I see for now is the network.target unit
seems not active on the failing server.
...
> (failing) # systemctl status network
> ? network.service - LSB: Bring up/down networking
>
I'm a little confused, too.  But, it might be more informative to query 
the system for "network.target" than "network.service" since
the former
is the one missing.

# rpm -V systemd
# locate network.target
/usr/lib/systemd/system/network.target
# systemctl status network.target
? network.target - Network
    Loaded: loaded (/usr/lib/systemd/system/network.target; static; 
vendor preset: disabled)
    Active: active since Wed 2015-12-16 20:19:26 PST; 6 days ago
      Docs: man:systemd.special(7)
http://www.freedesktop.org/wiki/Software/systemd/NetworkTarget

Dec 16 20:19:26 x systemd[1]: Reached target Network.
Dec 16 20:19:26 x systemd[1]: Starting Network.

----- Mail original -----
> De: "Gordon Messmer" <gordon.messmer at gmail.com>
> ?: "centos" <centos at centos.org>
> Envoy?: Mercredi 23 D?cembre 2015 10:11:05
> Objet: Re: [CentOS] Network services start before network is up since
migrating to 7.2
> I'm a little confused, too.  But, it might be more informative to query
> the system for "network.target" than "network.service"
since the former
> is the one missing.
# rpm -V systemd
S.5....T.  c /etc/rc.d/rc.local

Ok, normal...


# ll /usr/lib/systemd/system/network.target
-rw-r--r--. 1 root root 480 20 nov.  05:49
/usr/lib/systemd/system/network.target
# cat /usr/lib/systemd/system/network.target
#  This file is part of systemd.
#
#  systemd is free software; you can redistribute it and/or modify it
#  under the terms of the GNU Lesser General Public License as published by
#  the Free Software Foundation; either version 2.1 of the License, or
#  (at your option) any later version.

[Unit]
Description=Network
Documentation=man:systemd.special(7)
Documentation=http://www.freedesktop.org/wiki/Software/systemd/NetworkTarget
After=network-pre.target
RefuseManualStart=yes
# systemctl status network.target
? network.target - Network
   Loaded: loaded (/usr/lib/systemd/system/network.target; static; vendor
preset: disabled)
   Active: inactive (dead)
     Docs: man:systemd.special(7)
           http://www.freedesktop.org/wiki/Software/systemd/NetworkTarget

Dead ? Hmmm...

Sylvain.
Pensez ENVIRONNEMENT : n'imprimer que si ncessaire