On Thu, 16 Jan 2020 15:34:43 +0100, Stephen John Smoogen
<smooge@xxxxxxxxx> wrote:
On Thu, 16 Jan 2020 at 07:58, Asle Ommundsen <aommundsen@xxxxxxxxx>
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. [...cut...]
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?
Here is answers to your list. I have anonymized the some of the data:
1) Static ip configuration
2) This should be NetworkManager.
nmcli output:
eno1: connected to eno1
inet4 1.1.1.234/29
route4 1.1.1.232/29
route4 0.0.0.0/0
eno2: connected to eno2
inet4 192.168.0.5/24
route4 192.168.0.0/24
[root@server ~]# nmcli d show | grep IP4.GATEWA
IP4.GATEWAY: 1.1.1.1.233
3)
TYPE=Ethernet
PROXY_METHOD=none
BROWSER_ONLY=no
BOOTPROTO=none
DEFROUTE=yes
IPV4_FAILURE_FATAL=yes
IPV6INIT=yes
IPV6_AUTOCONF=yes
IPV6_DEFROUTE=yes
IPV6_FAILURE_FATAL=no
IPV6_ADDR_GEN_MODE=stable-privacy
NAME=eno1
UUID=1f9ec889-3c64-470a-894b-05543ee44c29
DEVICE=eno1
ONBOOT=yes
IPADDR=1.1.1..234
PREFIX=29
GATEWAY=1.1.1.233
IPV6_PRIVACY=no
4) Yes
5)
[root@server ~]# nmcli d show | grep IP4.GATEWA
IP4.GATEWAY: 1.1.1.233
nmtui shows the same gateway.
Kind regards,
Asle Ommundsen
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