[SOLVED] Have to restart network on restart?

sapslaj · 06-30-2012, 02:01 AM

Hello,
I'm running CentOS 6, and I recently did some manual network configuration to make it use a static IP. But ever since I did this, every time it boots, networking doesn't work until I do

Code:

sudo service network restart

Which, really isn't bad, and I know there are ways around it. But this a really big annoyance, as the power where I live is flaky, and it often goes out. So when the server comes back up, nobody can access it until I log in and restart the network daemon. So I'm curious as to what is causing this. Any ideas?

macemoneta · 06-30-2012, 02:29 AM

Take a look at your /var/log/boot.log to see what happened when the network started. If you don't see it starting, check 'chkconfig --list' to make sure it's configured to start at the runlevel you're using.

lithos · 06-30-2012, 03:10 AM

Hi,

I can help you only with some settings on my server, for you to find if any differences:

Code:

#>chkconfig --list | grep net
netconsole     	0:off	1:off	2:off	3:off	4:off	5:off	6:off
netfs          	0:off	1:off	2:off	3:on	4:on	5:on	6:off
netplugd       	0:off	1:off	2:off	3:off	4:off	5:off	6:off
network        	0:off	1:off	2:on	3:on	4:on	5:on	6:off

this would be set with:

Code:

#>chkconfig --levels 2345 network on

Then some configuration files:

Code:

root# cat /etc/sysconfig/network-scripts/ifcfg-eth0 
# Realtek Semiconductor Co., Ltd. RTL-8139/8139C/8139C+
DEVICE=eth0
HWADDR=00:20:xx:xx:xx:xx
ONBOOT=yes
BOOTPROTO=static
BROADCAST=192.168.0.255
IPADDR=192.168.0.7
NETMASK=255.255.255.0
NETWORK=192.168.0.0
TYPE=Ethernet


# cat /etc/sysconfig/network
NETWORKING=yes
NETWORKING_IPV6=no
HOSTNAME=localhost.localdomain
GATEWAY=192.168.0.254


# cat /etc/resolv.conf 
nameserver 127.0.0.1
nameserver 192.168.0.7


cat /etc/hosts
# Do not remove the following line, or various programs
# that require network functionality will fail.
127.0.0.1	localhost.localdomain localhost
::1		localhost6.localdomain6 localhost6
192.168.0.7	server_name

And this is about it, it starts on boot whenever it happens to get reset or power-off.

good luck

jefro · 06-30-2012, 08:45 AM

This link should still be a good example. http://www.unixmen.com/change-from-d...fedora-centos/

What exactly did you change?

sapslaj · 06-30-2012, 01:50 PM

Hey guys, thanks for the great responses.
Turns out, doing "chkconfig --list" turned out

Code:

network         0:off   1:off   2:off   3:off   4:off   5:off   6:off

So I did what @lithos said, and did "chkconfig --levels 2345 network on," restarted, works. Thanks for your help!
By the way, @jefro, I did tweaking to /etc/sysconfig/network-scripts/ifcfg-eth1, /etc/sysconfig/network, and /etc/resolv.conf. Also had to uninstall NetworkManager because it kept changing everything back to normal.

jefro · 06-30-2012, 02:02 PM

Give macemoneta a +1 then and mark it solved.

He got it.