[SOLVED] how to change the script at the network-script so not to waste time

albert0147 · 12-13-2013, 09:18 PM

Hello,
I was wondering if one can substitute quickly scripts. I am setting up a simple network and want to be able to have preconfigured scripts. For instance the /etc/sysconfig/network-scripts/ifcfg-eth0. This at the end could be changed quickly. I mean the path to the ifcfg-eth0 would maybe have another name or something. Or do I have to go in and change the vi file?
Take care,
Albert

druuna · 12-14-2013, 02:52 AM

I'm not at all sure what you are asking.

- If you want/need to edit a script/file you can use vi (or any other editor you like),
- You can also use awk or sed (just 2 examples) to change a file/script (no need for an editor in this case).

Without knowing exactly what it is you want I cannot help you any further.

Madhu Desai · 12-14-2013, 06:49 AM

Not sure what you want..

For example, if you want to change IP quickly, then

Code:

# ifconfig eth0 192.168.122.50 netmask 255.255.255.0 up

OR

# ip addr add 192.168.122.50/24 dev eth0
# ifup eth0

But these changes are not permanent. IP will default to the one in ifcfg-eth0 after reboot.

You can also set soft link to ifcfg-eth0 file from your home folder..

Code:

# ln -s /etc/sysconfig/network-scripts/ifcfg-eth0 eth0

# ls -l eth0
lrwxrwxrwx. 1 root root 41 Dec 14 18:18 eth0 -> /etc/sysconfig/network-scripts/ifcfg-eth0

# vi eth0

You can also try CDPATH.

albert0147 · 12-14-2013, 08:03 AM

Thanks,
I guess one can not swap out the ifcfg-eth0 file with another...say ifcfg-eth02 or any other name. I guess the permanent change is not that important for the ip address because it can be change quickly as noted.
Thanks again,
Albert

druuna · 12-14-2013, 08:19 AM

Quote:

Originally Posted by albert0147

I guess one can not swap out the ifcfg-eth0 file with another...say ifcfg-eth02 or any other name. I guess the permanent change is not that important for the ip address because it can be change quickly as noted.

There's a little bit more info in your reply.

Is this what you want: Have multiple ifcfg-eth0 files, each with their own unique properties inside?

If that is the case: The scripts that control bringing up the network devices look for a specific name pattern, if you use a different name it will not be used. Example ifcfg-eth0 will be used, _ifcfg-eth0 will not be used.

In the /etc/sysconfig/network-scripts/ directory you can create files like this:
_ifcfg-eth0.cfg1
_ifcfg-eth0.cfg2
_ifcfg-eth0.cfg3
etc.

The only thing you now need to to is to copy (not move) the correct file to the name that will be used:

Code:

cp _ifcfg-eth0.cfg2 ifcfg-eth0

Restart the network and cfg2 will be used.

albert0147 · 12-14-2013, 08:30 AM

Yes perfect.
Got it.
Thanks, I need to improve my question asking abilities.
Cheers,
Albert

druuna · 12-14-2013, 09:11 AM

You're welcome.

BTW: Can you put up the [SOLVED] tag.
- above the first post -> Please Mark this thread as solved if you feel a solution has been provided.
- -or- -
- first post -> Thread Tools -> Mark this thread as solved

Madhu Desai · 12-14-2013, 09:44 AM

Quote:

Originally Posted by albert0147

I guess one can not swap out the ifcfg-eth0 file with another...say ifcfg-eth02 or any other name.

Is this you want... Here, for example i have changed eth0 interface to bart-simpson

Code:

# ll /etc/sysconfig/network-scripts/ifcfg-*
-rw-r--r--. 1 root root 192 Dec 14 20:40 /etc/sysconfig/network-scripts/ifcfg-bart-simpson
-rw-r--r--. 1 root root 254 Dec 14 21:00 /etc/sysconfig/network-scripts/ifcfg-lo

# ifconfig bart-simpson
bart-simpson Link encap:Ethernet  HWaddr 52:54:00:73:0F:F5  
          inet addr:192.168.122.204  Bcast:192.168.122.255  Mask:255.255.255.0
          inet6 addr: fe80::5054:ff:fe73:ff5/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:309 errors:0 dropped:0 overruns:0 frame:0
          TX packets:137 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:34208 (33.4 KiB)  TX bytes:16876 (16.4 KiB)

# ifdown bart-simpson

# ifup bart-simpson
Determining IP information for bart-simpson... done.

albert0147 · 12-15-2013, 05:16 PM

Druuna,
I can not find that [solved]
Albert

druuna · 12-16-2013, 02:56 AM

Quote:

Originally Posted by albert0147

Druuna,
I can not find that [solved]
Albert

Have a look at the attached screenshot.