On Thu, 16 Jan 2020 at 07:58, Asle Ommundsen <aommundsen at gmail.com> wrote: > > Hi, > > Tonight I upgraded two CentOS 8 boxes to CentOS 8.1 (1911). Then after a > reboot of the first server the network was unavailable. In IPMI console > everything except the network was looking good. Network was unreachable. > No errors in NetworkManager. I also restarted NetworkManager, but it did > not help. Then I discovered that the default gateway suddenly was missing. > > Then I rebooted the server one more time, but network was still down. > > Then both myself and a technician in my datcenter was debugging this (I > had to wake him up in the middle of the night, costing me a lot of money), > without finding any reason for why the default gateway was missing after > reboot. > > Then we rebooted the server a third time, and all of a sudden the problem > was gone and the default gateway was back. > > Then, after this, I also upgraded my second CentOS 8 server to CentOS 8.1 > and did a reboot. And the very same thing happened to this server after > reboot! The default gateway was missing after reboot, and network was > down. Then I did a extra reboot of this server also, and when it came back > up everything was working correct and the default gateway was back. > > So the first server I needed to reboot two extra times to have the default > gateway back and network working. And the second server I needed to reboot > only one extra time for the problem to be solved. > > The two boxes is not VPSs or anything, but bare metal dedicated servers. > > Also prior to upgrading to CentOS 8.1, these two boxes has been rebooted > serveral times previously, without any problems at all. Only after > upgrading to CentOS 8.1 this happened on both of them for the first time. > > I can't believe I am the only one that experience this? My guess is that > this is a unknown random intermittent bug in CentOS 8.1 that kicked in. I > just hope this does not continue to happen in the future. If you > experienced the same, please share it with a reply. Thank you! In order to determine what is going on you need to give a lot more information. 1. How do these boxes get their network information? DHCP or static 2. If they are static, what controls the setting of ips: NetworkManager or network-scripts 3. If they are static, how are they set in /etc/sysconfig/network-scripts/ 4. Do the files in /etc/sysconfig/network-scripts list a GATEWAY= 5. If you are using network-manager, what does nmtui or the graphical tool say the gateway or default route is? > Kind regards, > Asle Ommundsen > _______________________________________________ > CentOS mailing list > CentOS at centos.org > https://lists.centos.org/mailman/listinfo/centos -- Stephen J Smoogen.