[CentOS] Network services start before network is up since migrating to 7.2

Hello all, 

I updated two of my servers to CentOS 7.2 (1511) two days ago, and since, on one of them, the network services are started (and fail to start) before the network interfaces are online.

Parts of "journalctl" after the last reboot :

déc. 17 10:21:44 myserver kernel: NET: Registered protocol family 40 
déc. 17 10:21:45 myserver sshd[700]: error: Bind to port 22 on 172.20.XX.XX failed: Cannot assign requested address. 
déc. 17 10:21:45 myserver sshd[700]: fatal: Cannot bind any address. 
déc. 17 10:21:45 myserver systemd[1]: sshd.service: main process exited, code=exited, status=255/n/a 
déc. 17 10:21:45 myserver systemd[1]: Unit sshd.service entered failed state. 
déc. 17 10:21:45 myserver systemd[1]: sshd.service failed. 
déc. 17 10:21:45 myserver sssd[729]: Starting up 
déc. 17 10:21:45 myserver kernel: nf_conntrack version 0.5.0 (16384 buckets, 65536 max) 
déc. 17 10:21:34 myserver systemd[1]: Time has been changed 
déc. 17 10:21:35 myserver iptables.init[699]: iptables: Applying firewall rules: [ OK ] 
déc. 17 10:21:35 myserver systemd[1]: Started IPv4 firewall with iptables. 
déc. 17 10:21:35 myserver systemd[1]: Starting LSB: Bring up/down networking... 
déc. 17 10:21:35 myserver network[790]: Activation de l'interface loopback : [ OK ] 
déc. 17 10:21:36 myserver httpd[686]: (99)Cannot assign requested address: AH00072: make_sock: could not bind to address 172.19.XX.XX:443 
déc. 17 10:21:36 myserver httpd[686]: no listening sockets available, shutting down 
déc. 17 10:21:36 myserver httpd[686]: AH00015: Unable to open logs 
déc. 17 10:21:36 myserver systemd[1]: httpd.service: main process exited, code=exited, status=1/FAILURE 
déc. 17 10:21:36 myserver kernel: vmxnet3 0000:03:00.0 ens160: intr type 3, mode 0, 2 vectors allocated 
déc. 17 10:21:36 myserver kernel: vmxnet3 0000:03:00.0 ens160: NIC Link is Up 10000 Mbps 
déc. 17 10:21:36 myserver kill[924]: kill: cannot find process "" 
déc. 17 10:21:36 myserver systemd[1]: httpd.service: control process exited, code=exited status=1 
déc. 17 10:21:36 myserver systemd[1]: Failed to start The Apache HTTP Server. 
déc. 17 10:21:36 myserver systemd[1]: Unit httpd.service entered failed state. 
déc. 17 10:21:36 myserver systemd[1]: httpd.service failed. 
déc. 17 10:21:36 myserver postfix/postfix-script[959]: starting the Postfix mail system 
déc. 17 10:21:36 myserver postfix/master[961]: daemon started -- version 2.10.1, configuration /etc/postfix 
déc. 17 10:21:36 myserver systemd[1]: Started Postfix Mail Transport Agent. 
déc. 17 10:21:36 myserver snmpd[704]: Turning on AgentX master support. 
déc. 17 10:21:36 myserver snmpd[704]: Error opening specified endpoint "udp:172.19.XX.XX:161" 
déc. 17 10:21:36 myserver snmpd[704]: Server Exiting with code 1 
déc. 17 10:21:36 myserver systemd[1]: snmpd.service: main process exited, code=exited, status=1/FAILURE 
déc. 17 10:21:36 myserver systemd[1]: Failed to start Simple Network Management Protocol (SNMP) Daemon.. 
déc. 17 10:21:36 myserver systemd[1]: Unit snmpd.service entered failed state. 
déc. 17 10:21:36 myserver systemd[1]: snmpd.service failed. 
(...)
déc. 17 10:21:38 myserver network[790]: Activation de l'interface ens160 : [ OK ] 
déc. 17 10:21:38 myserver kernel: vmxnet3 0000:0b:00.0 ens192: intr type 3, mode 0, 2 vectors allocated 
déc. 17 10:21:38 myserver kernel: vmxnet3 0000:0b:00.0 ens192: NIC Link is Up 10000 Mbps 
déc. 17 10:21:39 myserver ntpd[694]: Listen normally on 1 ens160 172.19.XX.XX UDP 123 
déc. 17 10:21:39 myserver ntpd[694]: new interface(s) found: waking up resolver 
déc. 17 10:21:40 myserver ntpd[694]: 0.0.0.0 c61c 0c clock_step +11.002914 s 
déc. 17 10:21:51 myserver ntpd[694]: 0.0.0.0 c614 04 freq_mode 
déc. 17 10:21:51 myserver systemd[1]: Time has been changed 
déc. 17 10:21:51 myserver network[790]: Activation de l'interface ens192 : [ OK ] 
déc. 17 10:21:51 myserver systemd[1]: Started LSB: Bring up/down networking. 
déc. 17 10:21:51 myserver systemd[1]: Reached target Network is Online. 
déc. 17 10:21:51 myserver systemd[1]: Starting Network is Online. 
déc. 17 10:21:51 myserver systemd[1]: Reached target Multi-User System. 
déc. 17 10:21:51 myserver systemd[1]: Starting Multi-User System. 
déc. 17 10:21:51 myserver systemd[1]: Starting Update UTMP about System Runlevel Changes... 
déc. 17 10:21:51 myserver systemd[1]: Started Stop Read-Ahead Data Collection 10s After Completed Startup. 
déc. 17 10:21:51 myserver systemd[1]: Started Update UTMP about System Runlevel Changes. 
déc. 17 10:21:51 myserver systemd[1]: Startup finished in 650ms (kernel) + 2.623s (initrd) + 13.647s (userspace) = 16.922s.

I found a workaround, by replacing "After=network.target" by "After=network-online.target" is the failing services' units, but I want to understand what is the root problem, and what is the difference between my two servers... And by now, I found nothing.

Got an idea ?

Sylvain CANOINE.





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