CentOS 7: eth0 down after reboot

FATeknollogee

Network configuration file in /etc/sysconfig/network-scripts/ is set to 'ONBOOT=yes'
I still need to restart the network service after a reboot.

Anyone have any idea why this is like this?
I just did a clean install & this issue still exists.

The vm's boot up & grab IP addresses but you can't SSH even though the SSH service is running.
Once I re-start the network service then I can SSH in.

black3dynamite

NetworkManager is running after reboot?

systemctl status NetworkManager

FATeknollogee

@black3dynamite said in CentOS 7: eth0 down after reboot:

NetworkManager is running after reboot?
systemctl status NetworkManager

Yes, active & running

black3dynamite

Here's my settings in ifcfg-eth0

TYPE=Ethernet
PROXY_METHOD=none
BROWSER_ONLY=no
BOOTPROTO=dhcp
DEFROUTE=yes
IPV4_FAILURE_FATAL=no
IPV6INIT=yes
IPV6_AUTOCONF=yes
IPV6_DEFROUTE=yes
IPV6_FAILURE_FATAL=no
IPV6_ADDR_GEN_MODE=stable-privacy
NAME=eth0
UUID=4c942ade-7461-438c-96e8-2cc3eb15cdf7
DEVICE=eth0
ONBOOT=yes
IPV6_PRIVACY=no
ZONE=public

FATeknollogee

@black3dynamite Mine looks the same.

Obsolesce

I always end up disabling Network Manager in CentOS because of dumb issues like this. Then it works great afterwards.

black3dynamite

@obsolesce said in CentOS 7: eth0 down after reboot:

I always end up disabling Network Manager in CentOS because of dumb issues like this. Then it works great afterwards.

I’ve never had issues with Network Manager. The only reason I would disable it because some weird applications doesn’t play nice with Network Manager.

dafyre

I've recently had issues with Nic's being renamed from something like eth0 to something like enp2s0 and vice versa at reboots.

coliver

@dafyre said in CentOS 7: eth0 down after reboot:

I've recently had issues with Nic's being renamed from something like eth0 to something like enp2s0 and vice versa at reboots.

There is a Red hat in article about that.

FATeknollogee

Adding this line (suggestion by Squeakz on #ovirt IRC) fixed the issue.
Each host has 4 nics, I only made the change on the first nic. When I tried on all 4 nics, none of them worked after reboot..

NM_CONTROLLED=no

Obsolesce

@fateknollogee said in CentOS 7: eth0 down after reboot:

Adding this line (suggestion by Squeakz on #ovirt IRC) fixed the issue.
Each host has 4 nics, I only made the change on the first nic. When I tried on all 4 nics, none of them worked after reboot..
NM_CONTROLLED=no

My point exactly. Get Network Manager out of the equation on CentOS, things always start working.